Strawberry plant `Diamante`
`CN210` is a new and distinct cultivar of strawberry plant of the day-neutral type which is more vigorous than `Selva` or `Seascape` and requires less chilling to maintain excellent fruit quality. When treated with appropriate planting regimes, `CN210` has much larger fruit and produces greater yields than the comparison cultivars.
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This invention relates to a new and distinctive day-neutral type cultivar designated as `CN210` also known as `Diamante`, which resulted from a cross performed in 1991 between advanced selections Cal 87.112-6 and Cal 88.270-1. The cultivar is botanically identified as F..times.ananassa Duch.
`CN210` was first fruited at the University of California Wolfskill Experimental Orchard, near Winters, Calif. in 1992, where it was selected, originally designated Cal 91.248-6, and propagated asexually by runners. Following selection and during testing the plant of this disclosure was designated `CN210`. With the decision that this plant was to be released, it was given the name `Diamante` for the purposes of introduction into commerce and for international registration and recognition. Asexual propagules from this original source have been tested at the Watsonville Strawberry Research Facility, the South Coast Research and Extension Center, and to a limited extent in grower fields starting in 1994.
BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 depicts the general flowering and fruiting characteristics of the plant.
FIG. 2 depicts a typical mature leaf during late spring.
FIG. 3 depicts representative mid-season fruit.
DETAILED DESCRIPTION OF THE INVENTION`CN210` is moderate to weak in expressing the day-neutral character, being a stronger day-neutral than `Seascape` (U. S. Plant Pat. No. 7,614), comparable or slightly more day-neutral than `Selva` (U.S. Plant Pat. No. 5,266), and less so than `Fern` (U. S. Plant Pat. No. 5,267) or `Irvine` (U.S. Plant Pat. No. 7,172). The production pattern for `CN210` is similar to that for `Selva` or `Seascape`, and will be of special interest for winter plantings, where `Selva` and `Seascape` have been successful and summer plantings where `Seascape`, has been successful.
Plants and FoliageFruiting plants of `CN210` are more erect and usually more vigorous than plants of `Selva` or `Seascape`, but also are more open and compact. With appropriate treatment, plant size for `CN210` is similar to `Selva`, and slightly smaller than `Seascape`. Comparative statistics for foliar characters near mid-season are given for the three cultivars in Table 1. Leaflets are similar in size but substantially more rounded than leaves of `Selva` or `Seascape`. Leaves including petioles are somewhat shorter and broader than the comparison cultivars. Petioles are much thicker and more stiff than those of `Selva` and `Seascape`. `CN210` has variable leaf convexity, generally more concave than leaves of `Selva`, and has fewer and more rounded serrations than the comparison cultivars. The adaxial (upper) leaf surface for `CN210` is darker and more glossy than for `Selva` and similar to `Seascape`, whereas the abaxial surface is slightly lighter than either comparison cultivar (Table 2).
Isozymes in Leaf Extracts`CN210` has been classified for three isozyme systems using starch gel electrophoresis (Table 3): Phosophoglucoisomerase (PGI), Leucine Aminopeptidase (LAP), and Phosphoglucomutase (PGM). It is distinguishable from `Selva` but not from `Seascape` using this methodology. For electrophoretic procedures see: J. Amer. Soc. Hort. Sci. 106:684-687.
Disease and Pest Reaction`CN210` is moderately susceptible to common leaf spot (Ramularia tulasnei), Verticillium wilt (Verticillium dahliae), and Anthracnose crown rot (Colletotrichum acutatum), and is relatively resistant to powdery mildew (Sphaerotheca macularis). When treated properly, it has tolerance to two-spotted spidermites (Tetranychus urticae) greater than `Seascape` and `Selva`. `CN210` is tolerant to strawberry viruses encountered in California.
Flowering, Fruiting, Fruit, and Production Characteristics`CN210` is similar to other California day-neutral cultivars (e. g. `Selva` and `Seascape`) in that it will flower independently of day length, given appropriate temperature and fertility conditions. Comparative statistics for flower and fruit characters near mid-season are given for the three cltivars in Table 4. The primary flowers for `CN210` are similar in size to `Selva` and `Seascape`; the sepals are somewhat smaller than for `Seascape` and substantially larger than for `Selva`. The calyx for `CN210` varies from slightly indented to even, and each primary flower has 5-6 petals. The fruit shape for `CN210` can vary but is typically a long rounded conic, and is easily distinguished from other California day-neutral cultivars. External and internal fruit color for `CN210` are substantially lighter than for `Selva` and `Seascape`, and fruit is substantially more glossy than either comparison cultivar (Table 2). Achenes vary from yellow to red, and are slightly indented.
`CN210` has been tested under a variety of cultural regimes, and optimal performance is obtained when nursery treatments and nutritional programs similar to those for `Selva` and `Seascape` are used. In general, `CN210` is more vigorous than the comparison cultivars and requires less chilling to maintain excellent fruit quality. `CN210` retains good fruit quality in summer planting systems, similar to `Seascape`.
When treated with appropriate planting regimes, `CN210` has much larger fruit and produces greater yields than `Selva` or `Seascape` (Table 5). Production for `CN210` initiates at dates similar to the comparision cultivars and it produces slightly larger quantities of late-season fruit. Commercial appearance ratings have been superior to those for the comparison cultivars. Fruit firmness is similar to that for `Selva` and greater than that for `Seascape`. Subjectively, `CN210` has excellent flavor, substantially better than `Selva` or `Seascape`. The fruit will be outstanding for both fresh market and processing, and will be useful for home garden purposes.
TABLE 1
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Foliar characteristics for `CN210`, `Selva` and
`Seascape`.
Foliar Cultivar
Character `Selva` `Seascape` `CN210`
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Mid-tier leaflet
Length (mm)
mean 72.6 72.8 64.9
range 65-88 65-82 57-72
Width (mm)
mean 68.2 64.5 68.4
range 51-84 48-78 63-76
Mid-tier leaf
Length (mm)
mean 119.2 123.8 117.9
range 94-139 80-155 89-145
Width (mm)
mean 130.1 127.1 124.7
range 111-170 108-150 115-139
# 3 3, rarely 4
3
leaflets/leaf
Leaf convexity
mostly flat to
concave to concave to
convex convex, mostly
convex, mostly
flat to convex
flat
Serrations
number few-moderate
moderate moderate
shape round to semiround to
rounded to
semipointed
semipointed
semipointed
Leaf moderate moderate moderate
pubescence
Petiole pubescence
density heavy mod. to heavy
heavy
direction perpendicular
perp to slight
perpendicular
acropetal
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TABLE 2
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Foliar and fruit color characteristics for
`CN210`, `Selva`, and `Seascape`
Color Cultivar
Character `Selva` `Seascape`
`CN210`
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Leaf color (CIELAB)
Adaxial
L*
mean 31.9 29.1 30.4
range 30.2-33.7 26.9-32.3 28.4-32.1
a*
mean -6.5 -5.1 -6.5
range -5.8--7.2 -2.4--6.6 -6.3--6.7
b*
mean 12.7 11.3 11.1
range 9.8-15.8 9.5-16.5 9.7-14.0
Munsell 2.5G 3/3 2.5GY 4/3 2.5GY 5/5
Abaxial
L*
mean 48.3 48.3 50.3
range 47.2-50.4 47.0-49.6 48.8-51.7
a*
mean -7.7 -7.2 -8.0
range -7.3--8.3 -6.3--8.0 -7.7--8.3
b*
mean -17.9 18.1 18.2
range 16.7-19.4 16.7-19.0 16.0-19.6
Munsell 7.5GY 4/4 10GY 4/5 7GY 4/4
Fruit color (CIELAB)
External
L*
mean 28.5 25.4 29.4
range 23.7-33.1 22.7-31.5 25.9-31.7
a*
mean 29.7 28.7 36.2
range 26.9-31.5 25.4-33.1 32.8-39.2
b*
mean 16.9 13.7 20.7
range 14.4-22.1 9.3-19.8 16.7-27.0
Munsell 5R 4/12 5R 3/7 7.5R 5/13
5R 4/12
Internal
L*
mean 48.8 45.5 61.2
range 44.4-53.1 38.3-55.0 52.6-66.2
a*
mean 35.2 37.8 18.7
range 31.5-39.5 30.8-42.7 13.5-31.3
b*
mean 29.4 26.9 16.4
range 26.9-33.9 21.9-34.2 13.4-24.6
Munsell 5R 5/13 7R 5/13 7.5R 8/6
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*CIELAB is the abbreviation of the international color system known as
"Commission Internationale De L'Eclairage" 1978. Recommendations on
uniform color spaces - color difference equations, psychometric color
terms, Supplement No. 2 to CIE Publication No. 15. PARIS.
TABLE 3
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Isozyme phenotypes for `CN210`, `Selva`, and
`Seascape`.
Cultivar
locus `Selva` `Seascape`
`CN210`
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PGI A2 A4 A4
LAP B3 B3 B3
PGM C2 C2 C2
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TABLE 4
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Flower and fruit characters for `CN210`, `Selva`,
and `Seascape`
Cultivar
Character `Selva` `Seascape` `CN210`
______________________________________
# petals
mean 5.8 6.1 5.1
range 5-8 5-7 5-6
Flower even most even mostly exposed
position or interior
some interior
(relative to or exposed
foliage)
Calyx diam. (mm)
mean 29.0 35.7 34.3
range 22-35 30-40 31-39
Corolla diam. (mm)
mean 37.5 35.7 33.0
range 31-43 32-40 30-38
Fruit shape
length/width
ratio 1.16 1.15 1.18
range 1.02-1.25 1.00-1.31 1.11-1.32
subjective conic to flat
mostly sharp
mostly rounded
conic conic conic
Calyx position
even with even/slight
slight indent
shoulder neck
Seed position
even/slight
slight indent
slight indent
extrude to slight
extrude
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TABLE 5
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Performance of `CN210`, `Selva`, and `Seascape`
evaluated at the Watsonville Research Facility in 1995 and 1996.
All plants for these materials were harvested from Macdoel on
October 16 or 17, and planted with three weeks supplemental
storage prior to planting. Harvest was initiated in early April
and continued through the first week of October.
(52" 2-row beds, 17,300 plants/acre,
100 grams/plant = 316.3 crates/acre)
Late
Yield Yield Appearance
Size
Item (g/plant)
(g/plant)
Score (g/fruit)
Firmness
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`Seava`
1,764 389 3.2 24.4 7.3
`Seascape`
1,832 375 3.3 24.0 6.9
`CN210`
2,035 440 4.1 30.7 8.1
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Late yield includes harvest from August 20 through October 10.
When `Diamante` is compared to `Aromas` (U.S. Plant patent application Ser. No. 08/747,506, filed Nov. 12, 1996), it is found that `Diamante` forms larger fruit that is lighter in coloration especially on interior fruit, and tends to be somewhat less productive.
Claims
1. The new and distinct cultivar of strawberry plant substantially as herein described and illustrated.
Type: Grant
Filed: Nov 12, 1996
Date of Patent: Jun 9, 1998
Assignee: The Regents of the University of California (Oakland, CA)
Inventor: Douglas V. Shaw (Davis, CA)
Primary Examiner: James R. Feyrer
Law Firm: Burns, Doane, Swecker & Mathis, L.L.P.
Application Number: 8/747,406
International Classification: A01H 500;
