Artichoke plant named ‘PS-MSG0619’

Abstract

A new and distinct Cynara cardunculus var. scolymus L. cultivar of artichoke plant named ‘PS-MSG0619’, characterized by its fleshiness of bracts; fleshiness of hearts; uniformity of head shapes; and male sterility which is demonstrated by the absence of pollen on all florets during anthesis.

Description

Latin name of the genus and species of the plant claimed: Cynara cardunculus L. var. scolymus L.

Variety denomination: ‘PS-MSG0619’.

BACKGROUND OF THE INVENTION

The present invention comprises a new and distinct cultivar of artichoke plant, botanically known as Cynara cardunculus L. var. scolymus L, and herein referred to by the cultivar name ‘PS-MSG0619’.

Cynara cardunculus L. var. scolymus L, commonly known as Globe artichoke, is a thistle-like perennial herb and is a member of the family Asteraceae. Globe artichokes comprise: leaves, which are pinnately lobed; but primarily spiney; oval capitula composed of an involucre of overlapping layers of large bracts; a receptacle, which are enlarged and fleshy. Globe artichoke plants may be propagated by division or vegetative means, and are essentially grown for the production of the immature flower heads, which are considered as vegetable delicacies. Fresh artichokes may be baked, steamed, or boiled, after which the fleshy receptacle, inner and outer bracts, and parts of the floral stem may be eaten.

The new artichoke cultivar is a product of a planned breeding program carried out by the inventor, William J. Colfer, in Chowchilla, Calif., in 2004. The new artichoke cultivar ‘PS-MSG0619’ is a result of a controlled cross between the female (seed) parent, Cynara cardunculus L. var. scolymus L designated ‘GGMSC5’ (unpatented) and the male (pollen) parent, Cynara cardunculus L. var. scolymus L designated ‘GGRCHB01’ (unpatented) The new artichoke ‘PS-MSG0619’ was discovered and selected by the inventor, as a single flowering plant within the progeny of the stated cross following several cycles of self-pollination in an outdoor field environment in 2003/2004 in Merced County, Calif. Self-pollination procedures were controlled by using “plant bagging” methods to create physical barriers around individual inflorescence. Specifically, pollen was collected from this selected plant and reintroduced three days later (self-pollination) to the same plant. Subsequent plant evaluation, selection and additional self-pollination were performed in outdoor field environment the following season(s). Following three cycles of inbreeding the progeny of these efforts was observed during anthesis. The lack of pollen presence in PS-MSG0619 was observed. This plant was retained for further observation, vegetative propagation and experimentation.

Asexual reproduction of the artichoke ‘PS-MSG0619’ by vegetative cuttings was first performed in (August 2004) in Castroville, Calif., and has demonstrated that the combination of characteristics as herein disclosed for the new cultivar are firmly fixed and retained through successive generations of asexual reproduction. The new cultivar reproduces true to type.

BRIEF SUMMARY OF THE INVENTION

The following traits have been repeatedly observed and are determined to be unique characteristics of ‘PS-MSG0619’, which in combination distinguish this artichoke as a new and distinct cultivar:

• • 1. fleshiness of bracts;
  • 2. fleshiness of hearts;
  • 3. uniformity of head shapes; and
  • 4. male sterility which is demonstrated by the absence of pollen on all florets during anthesis.
    It should be noted that these data were collected from second year transplants.

Plants of the new Cynara ‘PS-MSG0619’ differ from plants of the parents, ‘GGMSC5’ (unpatented) and ‘GGRCHB01’ (unpatented) in the following characteristics described in Table 1.

TABLE 1
Comparison with Parental Varieties
		Female Parent	Male Parent
	New Cultivar	‘GGMSC5’	‘GGRCHB01’
Characteristic	‘PS-MSG0619’	(unpatented)	(unpatented)
Head Number	7.20	5.8	7.25
Head Shape	oval	oval	Slightly rounded oval
Head Color	5 GY 5/6-	5 GY 5/4-	5 GY 4/6-5 GY 6/6
	5 GY 6/6	5 GY 4/4

Of the many commercial cultivars known to the present inventor, the most similar in comparison to the new Cynara ‘PS-MSG0619’ is Cynara ‘GREEN GLOBE’ (unpatented), in the following characteristics described in Table 2:

TABLE 2
Comparison with Similar Variety
	New Cultivar	Comparison Cultivar Name
Characteristic	‘PS-MSG0619’	‘GREEN GLOBE' (unpatented)
Average Head Number	7.2	6.4
Head exterior color	Green Yellow
	(non-glossy)	Green (no glossiness)
Fleshiness of bract (cm)	0.46	0.51

For identification, a series of AFLP molecular markers have been determined for this new artichoke cultivar.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photographs illustrate the overall appearance of the new artichoke ‘PS-MSG0619’ showing the colors as true as is reasonably possible with colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description, which accurately describe the color of ‘PS-MSG0619’. The depicted plant and plant parts of the new artichoke ‘PS-MSG0619’ were taken in Merced County, Calif. of second year transplants.

FIG. 1 shows a side view perspective of several ‘PS-MSG0619’ plants grown in the field;

FIG. 2 shows a close-up, side view perspective of a single head of ‘PS-MSG0619’ grown in the field;

FIG. 3A shows a close-up perspective of typical fruit, with their attached bracts (interior appearance); FIG. 3B shows a close up (interior appearance) of interior bracts (top of photograph) and outer bracts (bottom of photograph).

DETAILED BOTANICAL DESCRIPTION

The new artichoke ‘PS-MSG0619’ has not been observed under all possible environmental conditions. The phenotype of the new cultivar may vary with variations in environment factors, including weather (temperature, humidity, and light intensity), day length, soil type, and location, without any change in the genotype of the plant.

The aforementioned photographs, together with the following observations, measurements and values describe plants of ‘PS-MSG0619’ as grown in Castroville, Calif., under conditions which closely approximate those generally used in horticultural practice.

Castroville is located in California's central coast. Conditions can vary greatly during the summer months. Air temperature can range between the low 20's (degrees Fahrenheit) in the winter to above 80 (degrees Fahrenheit) during the summer months. Relative humidity is generally moderate with values ranging from the mid 40's to the high 60's. Prevailing winds are westerly, and rainfall rarely exceeds 25″ (inches) of rainfall.

In the following description, holding quality was measured by the physical appearance of the harvested heads. This includes the heads appearance following 3, 7 and 10 day storage periods in a cold storage room held at 34 (degrees Fahrenheit). Head exterior (oxidation) was observed at each of the three observation points. Browning and blackening of plant tissue was evaluated as light, moderate and extreme. Juiciness was measured by observing exudate and rated as absent, moderate or excessive. Overall storage response was measured by observations concentrated on visible color variability and/or presence of lesions or other cosmetic anomalies. Leaf ratio (L/W) was determined by dividing representative leaf sample length measurements by representative leaf sample width measurements. Finally, head response to (weather) was determined by observing the heads at maturity. These field observations focus on presence or absence of bronzing, necrotic and chlorotic lesions or any abiotic response to environmental conditions. These data are reported as the possible causal event(s), and then describe the detailed head and plant responses.

The age of the plants in the aforementioned photographs, together with the following observations, measurements and values describe plants of ‘PS-MSG0619’ about 890-921 days from transplanting. Plants were developed in transplant trays for about 120 to 150 days, for a total plant age of about 270 to 330 days. Not all greenhouse plantings are performed on the same day. Physical data collection may also be performed on different days.

All color references below are measured against The Munsell Book of Color, Munsell Color Macbeth Division of Kollmorgen Instruments Corporation, (1988/PRO88-A). Colors are approximate as color depends on horticultural practices such as light level and fertilization rate, among others.

• Classification:
  • • Botanical.—Cynara cardunculus L. var. scolymus L.
• Parentage:
  • • Female or seed parent.—Cynara cardunculus L. var. scolymus L designated ‘GGMSC5’ (unpatented).
    • Male or pollen parent.—Cynara cardunculus L. var. scolymus L designated ‘GGRCHB01’ (unpatented).
• Propagation: Vegetative cuttings (side-shoots selected and harvested from original parent selection.
• Plant:
  • • Height.—About 169.80 cm. Range: 165.10 cm to 173.00 cm.
    • Width.—About 148.25 cm. Range: 123.20 cm to 171.00 cm.
    • Growth habit.—Upright/intermediate.
    • Vigor.—Good. (This measurement is based on overall plant performance. Including plant height, density of leaf canopy and overall plant growth and development rates).
• Lateral shoots: These offshoots or suckers from axillary buds are borne at the base of the stem just below the soil surface.
  • • Number per plant.—About 2.0 or 5.0 per plant.
    • Length.—About 28.67 cm. Range: 20.32 cm to 33.26 cm.
    • Diameter.—About 2.17 cm. Range: 2.0 cm to 2.4 cm.
    • Color.—5 GY 6/4-5 GY 5/4. Anthocyanin coloration range: 10 RP 5/4-10 RP 4/4.
    • Foliage density.—Open to moderate, variable shoots give plant an open to moderate plant density appearance.
    • Side shoot development.—Moderate side shoot development. Plant responds to floral stalk removal inducing side-shoot development.
    • Number of leaves per side shoot.—Ranges from 3 to 6.
• Stem (main):
  • • Length.—About 12.19 cm. Range: 7.62 cm to 15.75 cm.
    • Diameter.—About 7.33 cm. Range: 5.33 cm to 9.40 cm.
    • Width (with leaves).—Ranges from 5.72 cm to 8.89 cm.
    • Color.—Color Designation: 5 GY 5/6-5 GY 5/4 coloration with basal anthocyanin coloration: 5RP 5/4-5RP 4/4.
    • Texture.—Stem texture can vary from areas that are tomentum to tomentose. Maturity and presence of surrounding leaf tissue influence stem pubescence.
    • Number of leaves per main stem.—Ranges from 12 to 14.
    • Distance between leaf lobes (use petiole or leaf insertion not lobes) on stem.—Ranges from 5.7 cm to 7.5 cm.
    • Internode length.—Ranges from 8.8 cm to 11.3 cm (Internode length influenced by soil conditions (moisture) in the field.
• Buds:
  • • Shape: (please confirm/modify).—Typically ovate. Range from slightly round to oval; surrounded by developing leaf tissue.
    • Height.—Ranges 15.24 cm to 18.54 cm.
    • Diameter.—Ranges 17.27 cm to 18.03 cm.
    • Color: (please confirm/modify).—Color dependent on age and exposure to sun. Ranges 5 GY 5/6-5 GY 6/6.
    • Texture: (please confirm/modify).—Glabrous, with some light pubescence at the base of the buds.
• Inflorescence: Mature, meaning grown to point of harvest and ready for consumption.
• Florets:
  • • Number per primary head.—Range of about 837 to 1341.
    • Overall shape.—Tubulose, fused basal region anther tubes that flare slightly to a flattened, expanded obtuse apex stigmatic region.
    • Width.—About 1.6 mm.
    • Color.—Purple-Blue, color dependent on floret age. Ranges 10PB 4/12-10PB 4/8-10PB 5/8. Florets oxidize to darker stigmatic colors and lighter anther colors late in maturation.
    • Margin.—Entire.
    • Texture.—Smooth.
• Capitulum (head):
  • • Number.—About 7.20/plant. Range: 6.0 to 8.0 heads/plant.
    • Shape.—Predominately oval shapes, and slightly broadened mid-sections, creating rounded to oval shape.
    • Size: (These measurements reflect the circumference range of the individual grades.).—(12) Primary: 36.20 cm to 38.10 cm. (18) Secondary: 28.58 cm to 30.40 cm. (24) Secondary: 31.12 cm to 33.02 cm. (30) Tertiary: 28.58 cm to 30.48 cm. (36) Tertiary: 26.04 cm to 27.94 cm. (48) Tertiary: 23.50 cm to 25.40 cm.
    • Texture.—Intermediate, smooth and non-glossy.
    • Color.—Ranges 5 GY 5/6-5 GY 6/6. Some marginal anthocyanin coloration is visible on the basal portions of bracts. (2.5 RP 3/6-2.5 RP 3/4).
    • Fragrance.—Mild, lightly aromatic. Slightly sweet aroma, freshly cut — green grass aroma.
    • Firmness.—Heads are firm. Some head types in the spring have reduced firmness.
    • Gloss.—Non-gloss green/tips yellow coloration. Heads have distinct overall flat green coloration.
    • Juiciness.—Some interior bracts have exudate visible. Most outer bracts and peduncle tissues are absent of exudate.
• Peduncle:
  • • Length.—Ranges 18.0 cm to 26.0 cm.
    • Diameter.—Ranges 2.00 cm to 2.40 cm.
    • Color.—Ranges 5 GY 7/6-5 GY 6/6. Deep grooves travel lengthwise modifying color uniformity.
    • Texture.—Early development can be tomentose while later development can be delicately tomentose. Distinct smooth grooves are also evident; running the length of the peduncle.
• Bract:
  • • Number.—About 56.60 bracts. Range: 54 to 60 bracts.
    • Arrangement.—Bracts layer and overlap attaching to a fleshy receptacle.
    • Length.—About 6.74 cm (outer); Range: 6.50 cm to 7.00 cm. About 5.84 cm (inner). Range: 5.50 cm to 6.20 cm.
    • Width.—About 5.21 cm (outer). Range: 4.70 cm to 5.50 cm. About 5.84 cm (inner). Range: 5.50 cm to 6.20 cm.
    • Shape.—Bracts are predominantly oval shaped with some bracts displaying deep apical notching. Inner bracts have constricted basal regions that expand at the base forming two rounded lobes.
    • Texture.—Smooth, slight texture.
    • Color (inner)(position in capitulum).—*Bract interior coloration: 2.5 GY 6/6-10 Y 8.5/4 (Green coloration). *Outer bract interior coloration (apex): 5 GY 7/6 / APEX: 2.5 GY 8/6 (Green — Yellow Coloration) No anthocyanin coloration present in innermost interior bract margins.
    • Color (outer)(position in capitulum).—5 GY 6/6 (Green Coloration). *Mid-region to base: 5 GY 6/6-5 GY 7/6 (Green coloration with basal yellow coloration).
    • Firmness.—Malleable. Bracts are highly flexible. Outer bracts are more flexible.
    • Spinosity.—Present on bract apexes. Spines are slight to moderate with notched bract apexes. Length ranges between 1.0 mm to 2.0 mm in length.
    • Basal thickness.—About 4.00 mm. Range: 3.00 cm to 5.00 mm.
• Heart:
  • • Description.—Deep concave, moderately full. Heart is slightly concave with moderate-thin outer margins.
    • Color.—7.5 Y 9/2-10 Y 9/2.
• Pappus:
  • • Number.—The pappus attaches at the apical region of the mature seed. Approximately 78-88 pappus filaments per seed. Seed numbers vary — about 837 to 1341 seeds per head. The seed numbers vary greatly; dependent upon weather conditions, pollination, fertilization and seed-set which consequently influence pappus numbers.
    • Length.—About 14.5 mm. Range: 13.0 mm to 16.0 mm.
    • Color.—Variable white coloration. 10Y 9/2 (base)-10Y 8.5/2 (apex) (colors difficult to match).
• Overall cold storage response: Good cold storage response. Very slight oxidation observed.
• Cold storage (hold quality): Good. Some very slight outer bract brown lesions are visible. Tips are free of necrosis.
• Head exterior (oxidation): Good. Only those areas damaged during harvest showed some oxidation. Very slight bract margin discoloration.
• Head response (weather): None. Some exterior head damage was observed. Some mechanical head damage was observed from abrasion with other surrounding heads.
• Foliage:
  • • Leaf.—Shape: Irregular, dentate leaves that are long and strap-like, parted pinnatisect margins, and a slightly reduced tomentose upper leaf surface and more advanced tomentose lower leaf surface. The leaf apex is a reduced mucronulate. Length: About 106.00 cm. Range: 94.5 cm to 113.0 cm. Width: About 41.60 cm. Range: 34.00 cm to 46.60 cm. Leaf Ratio (L/W): About 2.58. Range: 2.04 to 3.26. Leaf Area: (Describes the total surface area of the leaf; based on leaf L×W). About 4,393.00 cm². Range: 3696.00 cm² to 4972.00 cm². Leaf Serrations: About 52.0 mm. Range: 35.0 mm to 62 mm. Leaf Distance Between Serrations: About 64.10 mm. Range: 57.00 mm to 75.00 mm. Leaf Basal Angle: (This leaf basal angle is the average vertical angle plane reference.) About 52.60°. Range: 45.0° to 60.0°. Leaf Basal Thickness: About 9.70 mm. Range: 8.00 mm to 11.00 mm. Texture: Mature leaves are more blistered (verrucose type appearance). Younger, developing leaves are smooth and lack the blistered texture. Pubescence: Smooth to sparse density. Pubescence on most leaves is indistinct (glabrous appearance). Immature, younger leaves are highly pubescent (more tomentose). Color (mature): Upper surface: Ranges 5 GY 4/6-5 GY 5/6. Lower surface: Ranges 5 GY 4/4-5 GY 5/4. Color (immature): Upper surface: Ranges 5 GY 3/6-5 GY 4/4. Lower surface: Ranges 5 GY 4/4.
    • Lobes.—Number Per Leaf: About 12 to 16. (This number can also vary and is influenced by soil types and winter growth conditions). Apex Shape: Apex can vary obtuse to acute depending on leaf maturity and developmental stages in relation to reproductive bolting. Base Shape: Generally pinnatisect and lobed. Length: Ranges 15.6 cm to 23.2 cm (Dependent upon leaf developmental stages). Width: Ranges 6.5 cm to 8.4 cm.
    • Venation.—Basal regions of the leaf have slightly green coloration. The terminal and apical regions coloration is green. Both mid-vein and surrounding venation is green colored. Pattern: White mid-vein with light green color venation radiating from leaf mid-vein. Venation pattern is described as pinnate. Color: 5 GY 7/6-5 GY 8/4 (Upper leaf veination) ; 5 GY 8/4 (Lower leaf veination).
    • Petiole.—Length: About 9.73 cm. Range: 6.5 cm to 13.2 cm. Width: About 2.30 cm. Range: 2.20 cm to 2.61 cm. Diameter: About 8.33 mm. Range: About 8.0 mm to 9.0 mm. Color: 5 GY 8/4-5 GY 7/4 (Upper regions). 5 GY 8/4 (Lower regions).
• Reproductive organs/seeds: Seed are generally a light tan color with variable black specks on the seed coat. Seed has an oval (acute basal apex) shape. About 4 to 5 mm (w)×8 to 9 mm (l).
• Weather tolerance: No testing has been conducted. ‘PS-MSG0619’ may be sensitive to temperatures below 20° F.
• Disease/pest resistance: No observations made.
• Disease/pest susceptibility: No observations made.
• General observations: This new artichoke hybrid is a unique type that exhibits the following characteristics. The plants moderate height, ranging from 164 cm to 173 cm. Its comparative head qualities to California's artichoke variety ‘GREEN GLOBE’ (unpatented): green (non-glossy) (like ‘Green Globe’) exterior coloration, slightly larger head numbers. Head numbers ranging from 6-8 heads per plant. Head shape does have slight variation displaying a predominately oval shapes and, slightly broadened mid-sections, rounded — oval shapes. These non-glossy heads are produced in the sizes ranging from (12) primary, size (18) secondaries and size (30, 36 and 48) tertiaries. Floral stalk development and head numbers can vary. Anthocyanin coloration is not present in innermost interior bract margins. The head spinosity is present on bract apexes within apical notches. Inner bracts also display spines but can be very slightly notched and splitting. The average spine length ranges between 1.0-1.5 mm. The plants upright growth habit is intermediate, but is very vigorous. The canopies coloration is a deeper green/yellow color. These colors on Munsell Leaf Color Chart range from 5 GY 3/6-5 GY 4/4-5 GY 5/6. Leaf spinosity is light to moderate, categorized as few. Floral stalk development during anthesis produces a purple flower. Flower color varies with flower maturity. The phenotypic characteristics of this cultivar may vary slightly, depending upon variation in the environmental factors. Including weather (temperature, humidity and light intensity), day length, soil type, farming practices, location and time of year.

Claims

1. A new and distinct Cynara cardunculus var scolymus L. cultivar of artichoke plant named ‘PS-MSG0619’, as herein described and illustrated by the characteristics set forth above.