Buffalograss plant named `NE91-118`
A vegetatively reproduced buffalograss cultivar named `NE91-118` is distinguished from other commercially produced buffalograss varieties by its excellent turfgrass color, cold tolerance, high density, low growth habit, and rate of establishment. `NE91-118` is also distinguished by molecular markers and nuclear DNA content. `NE91-118` is suitable for use in low to medium maintenance situations in arid and semi-arid climates of United States and Canada.
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This application claims priority under 35 U.S.C. .sctn. 119(e) to U.S. provisional application Ser. No. 60/028,988, filed Oct. 22, 1996.
This applicaiton is also related to U.S. provisional application Ser. No. 60/028,987, filed Oct. 22, 1996, and U.S. provisional application Ser. No. 60/028,749, filed Oct. 23, 1996, both hereby incorporated by reference in their entireties.
This application is also related to U.S. plant application Ser. No. 08/955,786 and U.S. application Ser. No. 08/969,526, both filed on even date herewith, both hereby incorporated by reference in their entireties.
BACKGROUND OF THE INVENTIONBuffalograss [Buchloe dactyloides (Nutt) Engelm.] is a perennial, low growing, dioecious, warm-season grass species native to the Great Plains of North America. It thrives in semi-arid conditions, even under heavy grazing pressure, and spreads by branching stolons, creating a dense sod (Wenger, 1943; Beetle, 1950; Huff & Wu, 1987). Because of this adaptation, buffalograss can withstand combinations of cold, heat, and drought stress, yet still maintain an attractive turf (Wenger, 1943).
The center of origin for buffalograss is most likely central Mexico (Quinn & Engle, 1986; Shaw et al., 1987). It is native to an area from central Mexico to southern Canada (Wenger, 1943; Beetle, 1950) and altitudes below 2000 meters (Beetle, 1950). The range of adaptation is relatively stable, however seasonal precipitation variation may alter the eastern boundary (Wenger, 1941; 1943; Beetle, 1950). Buffalograss is the dominant species in the short grass prairie and cannot compete with the taller grasses in prairie communities in higher rainfall areas (Poransky, 1983).
Buffalograss was threatened with extinction due to heavy grazing and agricultural production (Beetle, 1950) but during the 1930's, it was recognized for its usefulness in restoring plant cover in the Great Plains after extreme drought, to prevent wind and water erosion of the soil. The drought resistance of buffalograss has been shown, in part due to its low evapotranspiration rate of six mm per day optimum growth conditions. This is less than any other commonly used warm and cool-season turfgrass. Characteristics responsible for the drought resistance include a finely branched root system, low growth habit, and the ability of leaf blades to limit transpiration by rolling longitudinally during drought stress (Savage & Jacobsen, 1935; Engleke & Hickey, 1983). Buffalograss will go dormant sooner than other grasses and will resume growth quickly once favorable moisture returns (Savage & Jacobsen, 1935; Beetle, 1950). Buffalograss survived mowing heights under 2.5 inches better than other native species with a noticeable increase in horizontal spreading and improved weed competition. These drought resistant and mowing tolerant characteristics make buffalograss a useful turfgrass in semi-arid portions of North America.
Buffalograss can be established by two methods: vegetative propagation or seed (Wenger, 1943; Poransky, 1983). Buffalograss establishment has typically been expensive. Vegetative propagation of buffalograss plugs or sod pieces has traditionally been done because low seed production of native stands and poor seedling establishment. Developments of automated pluggers and "big roll" sod handlers (Riordan et al., 1993) have made vegetative propagation more economical. Improvements have also been made in seed production and seed treatments (Klingenberg, 1993).
Buffalograss has been used for many years on highway shoulders or right-of-ways, airfield runways, cemeteries, parks, golf courses, and other athletic fields (Wegner, 1943; Beetle, 1950; Poransky, 1983). Because of environmental concerns and changes in landscape priorities, buffalograss has tremendous potential as a turfgrass. Breeding and development efforts are relatively new with emphasis on developing turf-type buffalograss cultivars which have low growth habit, improved color, faster establishment, improved density, extended growing season, and recuperative potential (Riordan et al., 1993; Engelke & Lehman, 1990; Wu & Harivandi, 1991).
SUMMARY OF THE INVENTION`NE91-118` is distinguished from other commercially available buffalograss cultivars. It is a vegetatively propagated female clone with turf color similar to `609` (U.S. Plant Pat. No. 8,475), but with increased winter hardiness. `NE91-118` exhibits a lower growth habit than `Prairie` (U.S. Plant Pat. No. 7,539), `609,` and `315` (U.S. Plant Pat. No. 9,847) buffalograsses. `NE91-118` also exhibits better overall turfgrass quality, density, and uniformity than seeded buffalograss varieties. It is best adapted to central and northern parts of the Great Plains. `NE91-118` provides an attractive, wear tolerant turf which requires less water, fertilizer, and mowing than other turfgrass species. These characteristics, along with field and greenhouse evaluations have shown `NE91-118` is well adapted to golf course roughs, home lawns, and general use areas requiring reduced management inputs.
BRIEF DESCRIPTION OF THE ILLUSTRATIONSFIG. 1 is a photograph of a typical stolon of `NE91-118`.
FIG. 2 is a photograph of turf produced by `NE91-118`, taken at Mead, Nebr.
FIG. 3 depicts DNA fingerprints of selected buffalograss varieties.
DETAILED DESCRIPTION OF THE PLANTBuffalograss `NE91-118` was selected from progeny of selection NE-84-104 at the John Seaton Anderson Turfgrass Research Facility near Mead, Nebr. After being selected, it was vegetatively (asexually) propagated. This is the way all buffalograsses are handled if they are being clonally propagated. In particular, buffalograss `NE91-118` was propagated vegetatively (asexually) at the John Seaton Anderson Turfgrass Ornamental Research Facility. Plugs and stolons were used to propagate it. The cultivar is completely stably reproduced by the aforementioned means. This selection, along with several thousand other selections, was evaluated at the John Seaton Anderson Turfgrass Research Facility near Mead, Nebr. The growth characteristics, turfgrass evaluation ratings, and molecular markers can be used to distinguish `NE91-118` from other commercially produced buffalograss varieties.
Morphological Characteristics`NE91-118` is a vigorous buffalograss cultivar, similar in respects to `609`, but with improved winter hardiness. `NE91-118` exhibits stolon internodes similar to `315`, and shorter than `609,` Texoka, `NE86-61`, and `NE86-120` (Table 1). Nodes are smaller on `NE-91-118`, with the exception of `NE86-61` (Table 1; FIG. 1). Leaf measurements are like the other turf varieties `315,` `609,` `NE86-61`, but smaller than `NE86-120` and Texoka (Table 2). This indicates the finer texture of the resulting turf. `NE91-118` has significantly less pubescence on nodes than selections other than `609,` (Table 1). `NE91-118` has significantly less pubescence on leaves than `NE86-120` and `NE86-61`, and more than `609` (Table 3). The purpose or adaptation of pubescence on buffalograss is not known, but may decrease evaporation of water from leaf surfaces (Kramer, 1983). Although `NE91-118` has few leaf hairs, it exhibits drought tolerance similar to other varieties.
Turfgrass CharacteristicsA quality turfgrass stand must have good, pleasing color. `NE91-118` exhibits a lighter green color than `315,` `378,` `NE86-61`, and `NE86-120`, but is comparable to `609` (Tables 4, 5, 6, & 7; FIG. 2). Turf quality incorporates color, but also involves density, texture, uniformity, and color (Turgeon, 1980). `NE91-118` has improved turf quality characteristics when compared to forage-type varieties, and is similar to other turf varieties.
The most desirable feature of `NE91-118` is its aggressiveness and sod forming ability. It has a moderate rate of establishment compared to other buffalograsses. `NE91-118` has faster establishment than `315` and slower establishment than `Texoka` (Table 6). In another test, `NE91-118` had faster establishment than `378` and insignificant differences with `315` and `Texoka` (Table 7). In most trials, vegetative cultivars are slower to establish than seeded varieties, however, plug spacing has an affect on plot coverage during the first year after planting (Johnson et al., 1997). `NE91-118` has much improved sod-forming ability when compared to the other cultivars hardy in the northern part of the Great Plains.
Buffalograss `NE91-118` cannot at this time be distinguished from other buffalograsses based on the characteristics of heat, drought, or salinity tolerance. Buffalograss has better heat and drought tolerance than other turfgrass species, but less salinity tolerance.
Buffalograss `NE91-118` has canopy density and inflorescence characteristics that are not distinguishable from other buffalograsses, with the exception of, perhaps, `Texoka.` Buffalograss canopy density and inflorescence characteristics would be different than for other species.
All northern adapted plants survive the winter cold period by going dormant early in fall and resume growth in the spring (Riordan et al., 1993). `NE91-118` is a typical northern-adapted cultivar in this respect. Southern adapted cultivars, such as `609` and `Prairie,` remain actively growing late into the fall, resulting in higher quality ratings (Tables 5, 6, & 7) but are subject to winterkill during Nebraska winters.
Molecular Marker AnalysisDNA fingerprinting was conducted using polymerase chain reaction (PCR) (Welsh and McClelland, 1991; Williams et al., 1990). DNA profiles of `NE91-118` were compared with `315,` `378,` `NE84-45-3`, `609,` `NE86-61`, `NE86-120`, and bulked sample of `Texoka` progeny. DNA was extracted from fresh leaf tissue using `Easy-DNA.TM. Kit` from Invitrogen (San Diego, Calif.). Fresh leaf tissue from each clone was ground with a mortar and pestel with liquid nitrogen. For `Texoka,` leaf tissue was collected from three solid seeded pots and bulked to obtain a bulked DNA sample from this seeded cultivar.
PCR was performed using decamer primers OPA-07 and OPA-16 from Operon Technologies (Alameda, Calif.). Samples were separated on a polyacrylamide gel and DNA fragments were visualized using ethidium bromide staining. DNA amplification was performed using an Idaho Technologies thermocycler (Idaho Falls, Id.) with two cycles of denaturing at 94.degree. C. for one minute, annealling at 40.degree. C. for seven seconds, and extension at 72.degree. C. for 70 seconds, followed by 43 cycles of denaturing at 94.degree. C. for three seconds, annealing at 40.degree. C. for seven seconds, extension at 72.degree. C. for 70 seconds. PCR reactions were performed in a volume of 25 .mu.l. The PCR reaction components were as follows:
______________________________________
Component Volume Concentration
______________________________________
Sterile H.sub.2 O
12.5 .mu.l
10X buffer 2.5 .mu.l
Tris 50 mM, pH 8.3
Bovine Serum Albumin 5 mg/ml
MgCl 25 mM
Sucrose 40% (w/v)
Cresol Red 1 mM
dNTPs 2.5 .mu.l 2 mM each dNTP
Taq DNA polymerase
2.5 .mu.l 0.4 U/.mu.l
Primer 2.5 .mu.l 5 .mu.M
DNA 2.5 .mu.l 25 ng/.mu.l
______________________________________
Primers used for DNA fingerprinting were OPA-07 and OPA-16 from Operon Technologies. Samples were loaded in a 5% polyacrylamide gel and electrophoresed at 44 volts (24 milliamps) in a TBE-8 buffer for approximately 2 hours and 45 minutes. DNA was visualized in the gel using ethidium bromide staining.
The DNA profiles produced are shown in FIG. 3. Using primer OPA-07, NE91-118 was the only genotype with a band of 200 base-pairs (bp), 520 bp, and 650 bp, but no band at 390 bp. With primer OPA-16, `NE91-118` was the only genotype with a band at 2020 bp.
Flow Cytometric AnalysisFlow cytometry was used to measure the nuclear DNA content within buffalograss cells. This method is a rapid way to differentiate between varieties having different numbers of chromosomes, and sometimes can differentiate among varieties having the same number of chromosomes. The detailed protocol for this method is listed below.
1. Collect young buffalograss leaves and keep moist at 4.degree. C.
2. Place 25-30 mg of the buffalograss leaves and 25-30 mg of Poa annua (UM-184) leaves in a petri dish on ice. DNA content of UM-184 Poa annua was determined separately and repeatedly as 4.64 picograms of DNA/nucleus.
3. Add with 1.0 ml of ice-cold buffer-propidium iodide solution and chop leaves into thin strips (<0.5 mm) with a scalpel. 15 ml of buffer solution, enough for 12-13 samples contains 14.3 ml of MgSO.sub.4 buffer solution (10 mM MgSO.sub.4.7H.sub.2 O, 50 mM KCl, 5 mM Hepes), 15 mg dithiothreitol, 300 .mu.l propidium iodide stock (5 mg/ml), 375 .mu.l Triton X-100 stock (10% w/v).
4. Filter the slurry through 30 .mu.m nylon mesh.
5. Centrifuge at 15,000 rpm for 15 seconds. Discard supernatant.
6. Resuspend in 200 .mu.l propidium iodide buffer solution+RNAse. (3 ml of extraction solution and 7.5 .mu.l of DNAse free RNAse.)
7. Incubate sample for 15 min. at 37.degree. C.
8. Analyze on a Becton-Dickinson FACScan flow cytometer using a wavelength of 488 nm (FIG. 1).
9. Calculate DNA content of buffalograss sample. ##EQU1##
Intact cell nuclei were isolated from young buffalograss leaves and passed through a flow cytometer to measure the amount of DNA in each nucleus. `NE91-118` was determined to have 1.81.+-.0.02 picograms DNA per nucleus (Table 8). This places `NE91-118` in the tetraploid group of buffalograsses together with `Prairie` and `609` having 40 chromosomes. `Stampede` is a diploid having 20 chromosomes. `315` is a pentaploid having 50 chromosomes. `378,` `NE86-61`, and `NE86-120` are among the hexaploid group having 60 chromosomes (Table 8).
Comparitive DataThe following tables provide data comparison of `NE91-118`, `NE86-61`, `NE86-120`, `315,` `378,` `609,` `Texoka,` and
TABLE 1
______________________________________
Internodal and nodal characteristics of buffalograsses (University
of Nebraska Greenhouse, Winter, 1996-97).
Third
Internode Length.sup.1
Internode Node
Internode 2
Internode 3
Width.sup.1
Pubescence.sup.2
Selection
(mm) (mm) (cm) (1-9)
______________________________________
`NE91-118`
4.2 .+-. 0.3
4.4 .+-. 0.4
3.0 .+-. 0.4
1.2 .+-. 0.1
`NE86-120`
5.3 .+-. 0.1
6.2 .+-. 0.4
3.9 .+-. 0.5
8.9 .+-. 0.1
`NE86-61`
5.0 .+-. 1.5
4.7 .+-. 0.9
2.8 .+-. 0.4
6.2 .+-. 0.1
`315` 3.9 .+-. 0.6
3.7 .+-. 0.2
3.7 .+-. 0.4
5.7 .+-. 0.6
`609` 5.6 .+-. 0.1
6.0 .+-. 0.2
3.6 .+-. 0.4
1.0 .+-. 0.0
`Texoka`
6.1 .+-. 1.3
6.2 .+-. 2.0
4.9 .+-. 0.2
4.2 .+-. 0.8
______________________________________
.sup.1 Average of five measurements on each of three replications.
.sup.2 Qualitative scale for trichome density, 1 = none, 5 = moderate, 9
heavy or fuzzy
TABLE 2
______________________________________
Leaf length and width measurements of buffalograsses (University
of Nebraska Greenhouse, Winter, 1996-97).
Leaf blade Length.sup.1
Leaf blade Width.sup.1
Selection (mm) (mm)
______________________________________
`NE91-118` 111.7 .+-. 6.4
1.4 .+-. 0.2
`NE86-120` 165.3 .+-. 25.2
1.5 .+-. 0.1
`NE86-61` 120.7 .+-. 1.8
1.6 .+-. 0.1
`315` 120.2 .+-. 9.2
1.6 .+-. 0.1
`609` 123.5 .+-. 5.1
1.4 .+-. 0.1
`Texoka` 198.9 .+-. 10.5
2.0 .+-. 0.1
______________________________________
.sup.1 Average of five measurements on each of three replications.
TABLE 3
______________________________________
Leaf pubsecence ratings of buffalograsses (University of Nebraska
Greenhouse, Winter, 1996-97).
Leaf Pubsecence.sup.1
Selection (1-9)
______________________________________
`NE91-118` 5.7 .+-. 0.4
`315` 5.5 .+-. 0.2
`609` 1.0 .+-. 0.0
`Texoka` 6.1 .+-. 0.4
______________________________________
.sup.1 Qualitative scale for trichome density, 1 = none, 5 = moderate, 9
heavy or fuzzy.
TABLE 4
______________________________________
Genetic color rating of buffalograsses (University of Nebraska
Greenhouse, Winter, 1996-97).
Genetic Color.sup.1
Selection (1-9) Leaf Color.sup.2
______________________________________
`NE91-118` 5.7 .+-. 0.4
137-C
`NE86-120` 7.7 .+-. 0.2
137-A
`NE86-61` 7.8 .+-. 0.2
137-A
`315` 6.2 .+-. 0.2
137-C
`609` 5.8 .+-. 0.2
137-C
`Texoka` 5.7 .+-. 0.7
137-C
______________________________________
.sup.1 Qualitative scale for plant color, 1 = yellow, 5 = medium green, 9
= dark green to bluegreen.
.sup.2 According to the R.H.S. Colour Chart in association with the Flowe
Council of Holland; 137A is darker than 137C.
TABLE 5
______________________________________
Turfgrass quality, color, and fall dormancy ratings, 1994-96
(Area 17, University of Nebraska John Seaton Anderson
Turfgrass Research Facility, Ithaca, NE).
Turfgrass Quality.sup.1
Turfgrass Color.sup.2
Fall Dormancy.sup.3
Selection
(1-9) (1-9) (1-9)
______________________________________
`NE91-118`
5.8 5.3 5.3
`315` 6.1 5.8 4.9
`378` 6.0 6.1 3.4
`Texoka`
4.9 4.8 4.2
LSD (.05)
1.0 1.1 2.4
______________________________________
.sup.1 Qualitative scale for overall quality, 1 = dead, 5 = acceptable
quality, 9 = ideal turf quality.
.sup.2 Qualitative scale for plant, color, 1 = yellow, 5 = medium green,
= dark green to bluegreen.
.sup.3 Qualitative rating of late fall growth, 1 = completely dormant, no
green leaves visible, 5 = approx. 50% green leaves visible, 9 = no
dormancy observed, all green leaves.
TABLE 6
______________________________________
Turfgrass quality, color, and fall dormancy ratings, 1993-95
(Area 23, University of Nebraska John Seaton Anderson
Turfgrass Research Facility, Ithaca, NE).
Turfgrass Turfgrass
Fall Establishment
Quality.sup.2
Color.sup.3
Dormancy.sup.4
(8/17/93)
Selection
(1-9) (1-9) (1-9) (% cover)
______________________________________
`NE91-118`
6.3 5.8 4.7 36.7
`315` 6.3 6.3 2.5 30.0
`609` 3.5 6.4 7.3 35.5
`Prairie`
4.0 5.5 4.7 25.0
`Texoka`
4.9 5.3 4.8 60.0
LSD (.05)
1.4 1.0 1.5 10.7
______________________________________
.sup.1 Qualitative scale for overall quality, 1 = dead, 5 = acceptable
quality, 9 = ideal turf quality.
.sup.2 Qualitative scale for plant color, 1 = yellow, 5 = medium green, 9
= dark green to bluegreen.
.sup.3 Qualitative rating of late fall growth, 1 = completely dormant, no
green leaves visible, 5 = approx. 50% green leaves visible, 9 = no
dormancy observed, all green leaves.
TABLE 7
______________________________________
Turfgrass quality, color, and fall dormancy ratings, 1995-96
(Area 25, University of Nebraska John Seaton Anderson
Turfgrass Research Facility, Ithaca, NE).
Turfgrass Turfgrass
Fall Establishment
Quality.sup.2
Color.sup.3
Dormancy.sup.4
(8/20/95)
Selection
(1-9) (1-9) (1-9) (% colver)
______________________________________
`NE91-118`
6.6 5.1 5.0 66.7
`315` 6.2 5.7 3.7 60.0
`378` 5.2 6.1 3.0 47.0
`Texoka`
4.9 4.4 5.3 70.0
LSD (.05)
1.0 1.0 1.4 13.0
______________________________________
.sup.1 Qualitative scale for overall quality, 1 = dead, 5 = acceptable
quality, 9 = ideal turf quality.
.sup.2 Qualitative scale for plant color, 1 = yellow, 5 = medium green, 9
= dark green to bluegreen.
.sup.3 Qualitative rating of late fall growth, 1 = completely dormant, no
green leaves visible, 5 = approx. 50% green leaves visible, 9 = no
dormancy observed, all green leaves.
TABLE 8
______________________________________
DNA contents of buffalograss clones.
DNA Content
SE
Family name
n (pg/nucleus)
(pg/nucleus)
______________________________________
Diploid.sup.1
`Stampede`
7 0.93 0.01
Tetraploid.sup.2
`NE91-118`
10 1.81 0.02
`Prairie` 2 1.80 0.00
`609` 9 1.81 0.02
Pentaploid.sup.3
`315` 11 2.29 0.02
Hexaploid.sup.4
`NE86-120`
24 2.59 0.04
`NE86-61` 8 2.58 0.02
`378` 7 2.60 0.09
______________________________________
.sup.1 2n = 20
.sup.2 2n = 40
.sup.3 2n = 50
.sup.4 2n = 60
THE VARIETY
Origin: Plant selected from progeny of female parent NE-84-104. NE-84-104 was selected from a buffalograss stand near Dallas,Tex.
Classification:
Botanic.--Buchloe dactyloides (Nutt.) Engelm.
Chromosome number: 2n=4x=40.
Form: Monocot Gramineae.
Growth habit: A perennial plant, with a stoloniferous growth habit, which allows it to be propagated vegetatively. It will spread slowly under non-competitive conditions and when conditions favor stolon growth. It has a very fibrous root system which can have a depth of 100 to 150 cm. It will produce a dense, fine-textured turf with dark green color throughout most of the growing season. From middle fall to early spring, the grass is dormant.
Establishment rate:
Plugs.--12-14 weeks with irrigation.
Sod.--1-2 weeks.
Sprigs.--not recommended.
Regions of adaptation: North to south, from the U.S.-Canada border to northern Mexico, east to west, from Missouri to California. The exact geographic region of adaptation is currently under investigation in a national test directed by the National Turfgrass Evaluation Program.
Blade:.sup.1
Shape.--Long, slender.
Length.--11 cm.
Width.--1.4 mm.
Pubescence.--Light, compared to other buffalograsses.
Leaf color:.sup.2 Green, 137-C.
Mature plant height: 15 cm.
Above canopy stolons: Minimal compared to `Prairie.`
Internode length:.sup.1 4 cm (internode 2).
Internode color:.sup.1,2 Yellow-green, 144-A.
Node width:.sup.1 3.0 mm (node 3).
Soil adaptation: Heavy soils -- silty clay loam preferred, slightly acid to alkaline pH.
Female inflorescence: Present, heavy in early growing season. The inflorescence is a spike.
Male inflorescence: Absent.
.sup.1 Measurements made on greenhouse grown plants.
.sup.2 RHA Colour Chart Designations.
REFERENCESAll references cited herein are hereby incorporated by reference in their entireties.
Arumuganathan, K. and E.D. Earle, 1991. Estimation of nuclear DNA content of plants by flow cytometry. Plant Molecular Biology Report 9:229-233.
Beard, J.B. and K.S. Kim, 1989. Low-water use turfgrasses. USGA Green Section Record. 27:12-13.
Beetle, A.A., 1950. Buffalograss -- native of the shortgrass plains. Agr. Exp. Sta., Univ. of WY, Laramie, Bulletin 293:1-31.
Engelke, M.C. and V.G. Hickey, 1983. Buffalograss germplasm diversity and development for semi-arid turf. Texas Turfgrass Proc. PR 4150. pg. 21-22.
Engelke, M.C. and V.G. Lehman, 1990. Registration of Prairie buffalograss. Crop Sci. 30:1360.
Galbraith, D.W., K.R. Harkins, J.M. Maddox, N.M. Ayres, D.P. Sharma, and E. Firoozbady, 1983. Rapid flow cytometric analysis of cell cycle in intact plant tissues. Science 220:1049-1051.
Givan, A.L., 1992. Flow Cytometry: first principles. Wiley-Liss, Inc. New York, New York.
Johnson, P.G., T.P. Riordan, R.E. Gaussoin, D.J. Schwarze, and K.A. Kerner, 1997. Submitted to the Eight International Turfgrass Society Research Journal.
Klingenberg, J.P., 1993. Evaluatin, genetic variation, and selection for improvement of a seeded, turf-type buffalograss population (Buchloe dactyloides). Ph.D. diss. University of Nebraska-Lincoln.
Kramer, P.J., 1983. Water Relations of Plants. Academic Press. New York, NY.
Poransky, T. 1983. Buffalograss: Home on the range, but also a turfgrass. Rangelands 5:214-216.
Quinn, J.A. and J.L. Engel, 1986. Life history strategies and sex ratios for a cultivar and wild population of Buchloe dactyloides (Gramineae). Am. J. of Bot. 73:874-881.
R.H.S. Colour Chart, 1966. The Royal Horitcultural Society, London.
Riordan, T.P., S.A. deShazer, J.M. Johnson-Cicalese, and R.C. Shearman, 1993. An overview of breeding and development of buffalograss for golf course turf. International Turfgrass Society Research Journal 7:816-822.
Savage, D.J., and L.A. Jacobson, 1935. The killing effect of heat and drought on buffalograss and blue grama grass at Hays, Kans. J. of American Soc. of Agronomy 22:566-682.
Turgeon, A.J., 1980. Turfgrass Management. Reston Publishing Co., Inc. Reston, Va. 22090
Welsh, J. and M. McClelland, 1991. Fingerprinting genomes using PCR with arbitrary primers. Nucleic Acids Res. 18:7213-7218.
Wenger, L.E., 1941. Improvement of buffalograss in Kansas. Kansas State Board of Agri. 32nd Biennial Report. 1c 211-224.
Wenger, L.E., 1943. Buffalograss. Kansas Agri. Exp. Sta. (Manhattan) Bulletin 321:1-78.
Williams, J.G.K., A.R. Kubelik, K.J. Livak, J.A. Rafalski, and S.V. Tingey, 1990. DNA polymorphisms amplified by arbitrary primers are useful as genetic markers. Nucleic Acids Res. 18:6531-6535.
Wu, L. and M.A. Harivandi, 1989. Winter turf color retention and cold resistance among buffalograss collections. Proc. 6th Int. Turfgrass Res. Conf. pp. 137-139. I.T.S., Tokyo, Japan. H. Takatoh (ed.).
Claims
1. A new and distinct perennial, female buffalograss cultivar substantially, as herein shown and described, distinguished by its brighter green color, improved turfgrass quality, tolerance to low mowing, unique molecular marker pattern, tetraploid DNA content, vegetative propagation and tolerance to heat, drought, cold, and low maintenance
| PP7539 | May 28, 1991 | Engelke et al. |
| PP8475 | November 23, 1993 | Riordan et al. |
| PP8896 | September 13, 1994 | Wu |
| PP8897 | September 13, 1994 | Wu |
| PP9208 | July 18, 1995 | Mancino |
| PP9847 | April 1, 1997 | Riordan et al. |
| PP10576 | August 25, 1998 | Bughrara et al. |
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Type: Grant
Filed: Oct 22, 1997
Date of Patent: May 9, 2000
Assignee: Board of Regents University of Nebraska-Lincoln (Lincoln, NE)
Inventors: Terrance P. Riordan (Lincoln, NE), Frederick P. Baxendale (Lincoln, NE), Roch E. Gaussoin (Lincoln, NE), Jennifer M. Johnson-Cicalese (Mt. Holly, NJ), Paul G. Johnson (Lincoln, NE), Edward John Kinbacher (Lincoln, NE)
Primary Examiner: Howard J. Locker
Assistant Examiner: Ashwin Mehta
Law Firm: Suiter & Associates PC
Application Number: 8/956,070
