EFFECT OF FRUIT COLOR ON HARVEST SPEED OF ZUCCHINI

1986 ◽  
Vol 66 (3) ◽  
pp. 811-815 ◽  
Author(s):  
HARRY S. PARIS ◽  
HAIM NERSON ◽  
ZVI KARCHI
Keyword(s):  
Cucurbita Pepo ◽  
Growth Habit ◽  
Fruit Color ◽  
Field Conditions ◽  
Summer Squash ◽  
Golden Yellow ◽  
Dark Green ◽  
Open Growth

Two zucchini (Cucurbita pepo) cultivars having dark green fruits, Ambassador and Bareqet, and one having golden-yellow fruits, Goldy, were compared for speed of harvest under field conditions. Plots of Goldy were harvested 18%, fruits 20%, marketable fruits 26% and Grade A fruits 33% faster than those of Ambassador or Bareqet. All three cultivars had an open growth habit and produced nearly identical numbers of fruits. The results indicate that the differences in harvest speed among the cultivars were based mainly on camouflage of the green fruits and contrast of the golden-yellow fruits with the green foliage.Key words: Zucchini, Cucurbita pepo, gene B, summer squash, marrow, courgette

scholarly journals 153 GENES FOR INTENSE COLORATION OF ACORN SQUASH

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 450f-450
Author(s):  
Harry S. Paris
Keyword(s):  
Cucurbita Pepo ◽  
Genetic Basis ◽  
Fruit Color ◽  
Color Intensity ◽  
Major Genes ◽  
Green Color ◽  
Clear Cut ◽  
Dark Green ◽  
Light Green

The fruits of Cucurbita pepo cv. Table Queen are light green when young, turn dark green by intermediate age (15-18 days past anthesis) and remain dark green through maturity. Three major genes are known to affect developmental fruit color intensity in C. pepo: D, 1-1, and 1-2. Table Queen was crossed with cv. Vegetable Spaghetti and with tester stocks of known genotype in order to determine the genetic basis of its developmental fruit coloration. The results from filial, backcross. and testcross generations suggest that Table Queen carries gene D, which confers dark stem and fruit color from intermediate fruit age through maturity. Table Queen also carries L-2. which confers Light Type 2 (a pattern of grayish green hue) fruit color from intermediate age, but D is epistatic to L-2. The genotype of Table Queen is D/D 1-1/1-1 L-2/L-2. Clear-cut results were not obtained -- regarding the genetic basis of the retention of green color through maturity of Table Queen fruits.

scholarly journals Parthenocarpy in Summer Squash

HortScience ◽  
1999 ◽  
Vol 34 (4) ◽  
pp. 715-717 ◽  
Author(s):  
R.W. Robinson ◽  
Stephen Reiners
Keyword(s):  
Disease Resistance ◽  
Cucurbita Pepo ◽  
Fruit Set ◽  
High Rate ◽  
Parthenocarpic Fruit ◽  
Row Covers ◽  
Summer Squash ◽  
Multiple Disease Resistance ◽  
Pollinating Insects ◽  
Dark Green

Summer squash (Cucurbita pepo L.) cultivars were compared for ability to set parthenocarpic fruit. Some cultivars set no parthenocarpic fruit and others varied in the amount of fruit set when not pollinated. The degree of parthenocarpy varied with season, but the relative ranking of cultivars for parthenocarpy was generally similar. Cultivars with the best parthenocarpic fruit set were of the dark green, zucchini type, but some cultivars of other fruit types also set parthenocarpic fruit. A summer squash cultivar was developed that combines a high rate of natural parthenocarpy with multiple disease resistance. Yield of summer squash plants grown under row covers that excluded pollinating insects was as much as 83% of that of insect-pollinated plants in the open.

scholarly journals Genes for Retention of Green Fruit Color through Maturity of Acorn Squash

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 602c-602
Author(s):  
Harry S. Paris
Keyword(s):  
Cucurbita Pepo ◽  
Genetic Basis ◽  
Fruit Color ◽  
Complete Loss ◽  
Green Color ◽  
Green Fruit ◽  
Color Retention ◽  
Recessive Genes ◽  
Dark Green ◽  
Light Green

Most cultivars of acorn squash (Cucurbita pepo), such as `Table Queen', have fruit that are light green when young, become dark green by intermediate age, and remain dark green through maturity, carrying genotype D/D l-l/l-1 L-2/L-2. Many other forms of C. pepo that carry this genotype, the most familiar being the Halloween and pie pumpkins, turn orange at maturity. The genetic basis for green color retention of acorn squash was investigated by crossing `Table Queen' with `Vegetable Spaghetti', `Fordhook Zucchini', and accession 85k-9-107-2 (the parental, filial, backcross, and testcross generation progenies being grown out in the field and observed and scored for fruit color at maturity, between 40 and 44 days past anthesis). The results indicated that the three stocks crossed with `Table Queen' carry two recessive genes, designated mature orange-1 (mo-1) and mature orange-2 (mo-2), which act in concert to result in complete loss of green color before maturity in 1-1/1-1 plants. `Table Queen' is Mo-l/Mo-1 Mo-2∼o-2. Genes D and mo-2 are linked, ≈15 map units apart.

scholarly journals A comprehensive RNA-Seq-based gene expression atlas of the summer squash (Cucurbita pepo) provides insights into fruit morphology and ripening mechanisms

BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Aliki Xanthopoulou ◽  
Javier Montero-Pau ◽  
Belén Picó ◽  
Panagiotis Boumpas ◽  
Eleni Tsaliki ◽  
...  
Keyword(s):  
Gene Expression ◽  
Cucurbita Pepo ◽  
Developmental Stages ◽  
Lateral Roots ◽  
Expression Patterns ◽  
Male Flower ◽  
Differentially Expressed ◽  
Gene Expression Atlas ◽  
Summer Squash ◽  
Expression Atlas

Abstract Background Summer squash (Cucurbita pepo: Cucurbitaceae) are a popular horticultural crop for which there is insufficient genomic and transcriptomic information. Gene expression atlases are crucial for the identification of genes expressed in different tissues at various plant developmental stages. Here, we present the first comprehensive gene expression atlas for a summer squash cultivar, including transcripts obtained from seeds, shoots, leaf stem, young and developed leaves, male and female flowers, fruits of seven developmental stages, as well as primary and lateral roots. Results In total, 27,868 genes and 2352 novel transcripts were annotated from these 16 tissues, with over 18,000 genes common to all tissue groups. Of these, 3812 were identified as housekeeping genes, half of which assigned to known gene ontologies. Flowers, seeds, and young fruits had the largest number of specific genes, whilst intermediate-age fruits the fewest. There also were genes that were differentially expressed in the various tissues, the male flower being the tissue with the most differentially expressed genes in pair-wise comparisons with the remaining tissues, and the leaf stem the least. The largest expression change during fruit development was early on, from female flower to fruit two days after pollination. A weighted correlation network analysis performed on the global gene expression dataset assigned 25,413 genes to 24 coexpression groups, and some of these groups exhibited strong tissue specificity. Conclusions These findings enrich our understanding about the transcriptomic events associated with summer squash development and ripening. This comprehensive gene expression atlas is expected not only to provide a global view of gene expression patterns in all major tissues in C. pepo but to also serve as a valuable resource for functional genomics and gene discovery in Cucurbitaceae.

scholarly journals Age-related Resistance of Diverse Cucurbit Fruit to Infection by Phytophthora capsici

2009 ◽  
Vol 134 (2) ◽  
pp. 176-182 ◽  
Author(s):  
Kaori Ando ◽  
Sue Hammar ◽  
Rebecca Grumet
Keyword(s):  
Cucumis Melo ◽  
Cucurbita Pepo ◽  
Citrullus Lanatus ◽  
Phytophthora Capsici ◽  
Vegetable Production ◽  
Age Related ◽  
Cucumber Fruit ◽  
Summer Squash ◽  
Pronounced Reduction ◽  
Green Stage

Phytophthora capsici causes severe losses in vegetable production, including many cucurbit crops. Our previous work showed that cucumber (Cucumis sativus) fruit are most susceptible to P. capsici when they are very young and rapidly elongating, but develop resistance as they approach full length at 10 to 12 days postpollination (DPP). In this study, fruit from seven additional cucurbit crops representing four species, melon (Cucumis melo), butternut squash (Cucurbita moschata), watermelon (Citrullus lanatus), and zucchini, yellow summer squash, acorn squash, and pumpkin (Cucurbita pepo), were tested for the effect of fruit development on susceptibility to P. capsici. Field-grown fruit of the different crops varied in overall susceptibility. Zucchini and yellow summer squash were the most susceptible, with the majority of fruit exhibiting water-soaking symptoms within 24 hours postinoculation. Fruit from all of the crops exhibited size-related decrease in susceptibility, but to varying degrees. Cucumber had the most pronounced effect. In infested fields, cucumber fruit were found to be most frequently infected at the blossom end. Comparison of the peduncle and blossom end showed a difference in susceptibility along the length of the fruit for cucumber, butternut squash, and zucchini. Greenhouse-grown, hand-pollinated pumpkin, acorn squash, and butternut squash showed an age-related decrease in susceptibility similar to field-grown fruit. For all of these fruit, a pronounced reduction in susceptibility accompanied the transition from the waxy green to green stage at ≈3 to 8 DPP.

scholarly journals Foraging Preference of Giant Honeybee, Apis dorsata F., to Selected Horticultural Crops

2006 ◽  
Vol 27 ◽  
pp. 87-92 ◽  
Author(s):  
KR Neupane ◽  
DD Dhakal ◽  
RB Thapa ◽  
DM Gautam
Keyword(s):  
Raphanus Sativus ◽  
Cucurbita Pepo ◽  
Citrus Limon ◽  
Apis Dorsata ◽  
Flowering Period ◽  
Late Flowering ◽  
Horticultural Crops ◽  
Summer Squash ◽  
Foraging Preference ◽  
Bottle Brush

Foraging preference of giant honeybee, Apis dorsata Fab. to selected horticultural crops, litchi, Litchi chinensis Sonner, lemon, Citrus limon (Lin.) Burm. f., bottlebrush, Callistemon citrinus (Curtis) Skeels, cucumber, Cucumis sativus Lin., radish, Raphanus sativus Lin., and summer squash, Cucurbita pepo L., was studied during their blooming time at IAAS, Rampur, Chitwan, Nepal, 2001. The flowering of all six species of experimental plants started in the first week of March and lasted for two months with a peak flowering from 15 March to 5 April. Foraging preference of bees at 7.30, and 11.00 am and 3.00 pm and 5.30 pm during early, mid and late periods of flowering was assessed. Honeybees foraging at different times of day during early, mid and late flowering periods differed significantly. The highest mean number (8.04/min/m2) of A. dorsata workers was recorded on bottle brush flowers at 7.30 am during early flowering period followed by litchi, summer squash and the lowest (0.25/min/m2) on citrus at 5.30 pm during late flowering period. The bees never visited to the flowers of radish and cucumber. Pollen was preferentially collected from bottlebrush, summer squash and citrus in the morning and nectar from litchi and bottlebrush flowers throughout the day. Pollen foragers spent less time (2.9±1 sec/flower) and visited more flowers (17.9±6/min) when bees collected both pollen and nectar from the same plant. The number of outgoing and incoming foragers were the highest (59.0±14, 44.0±15/min/colony) at 7.30 am during mid flowering period and the lowest (17.6±7, 17.0±2/min/colony) at 5.30 pm during late flowering period, respectively. Key words: Foraging preference, Apis dorsata, horticultural crops J. Inst. Agric. Anim. Sci. 27:87-92 (2006)

scholarly journals Inheritance of resistance to papaya ringspot virus-watermelon strain (PRSV-W) in 'Whitaker' summer squash line

2015 ◽  
Vol 15 (4) ◽  
pp. 203-209 ◽  
Author(s):  
Cícero B Menezes ◽  
Wilson R Maluf ◽  
Marcos V Faria ◽  
Sebastião M Azevedo ◽  
Juliano T V Resende ◽  
...  
Keyword(s):  
Genetic Control ◽  
Cucurbita Pepo ◽  
Major Gene ◽  
Ringspot Virus ◽  
Inheritance Of Resistance ◽  
Papaya Ringspot Virus ◽  
Broad Sense Heritability ◽  
Major Gene Effect ◽  
Summer Squash ◽  
Parental Lines

Abstract The objective of this work was to study the genetic control of the PRSV-W (Papaya Ringspot Virus - Watermelon Strain) resistance in Cucurbita pepo 'Whitaker' line. Plants of parental lines Whitaker (resistant) and Caserta (susceptible), and of the generations F1, F2, BC11 and BC12 were evaluated for their reactions to PRSV-W. Caserta plants showed severe mosaic symptoms, while Whitaker grew vigorously and remained almost totally symptom-free. Most of the F1, F2 and backcross plants also presented severe mosaic symptoms. Data were used to test a hypothesis of monogenic inheritance under different presumed degrees of dominance, and genetic models were tested using maximum likelihood tests of genetic control. Broad-sense heritability was of 0.57 for the first evaluation. Resistance to PRSV-W in C. pepo 'Whitaker' is due to a major gene effect summed to polygenic effects.

Evaluation of low temperature hardiness of strawberry plants under field and controlled conditions

1993 ◽  
Vol 73 (4) ◽  
pp. 1123-1125 ◽  
Author(s):  
J. M. Turner ◽  
K. K. Tanino ◽  
C. Stushnoff
Keyword(s):  
Low Temperature ◽  
Key Words ◽  
Scoring System ◽  
Growth Habit ◽  
Field Conditions ◽  
Mother Plant ◽  
Fragaria Ananassa ◽  
Plant Survival ◽  
Field Growth ◽  
Mother Plants

When acclimated strawberry plants (Fragaria × ananassa Duch. ’Redcoat’) from the field were placed in a programmable freezer, mother strawberry crowns were as hardy or hardier than daughter crowns when frozen to −11 °C. However, under field conditions, daughter plants expressed consistently greater hardiness than mother plants. Mulching had no effect on daughter plant survival, whereas enhanced mother plant survival was observed. Field-growth habit of mother crowns may be the important factor for consistent winter survival under prairie conditions. A simple scoring system was developed to predict survival of strawberry plants. Key words. Fragaria × ananassa Duch., strawberry, crowns, low temperature hardiness

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