scholarly journals THE EFFECTS OF ANTI-MITOTIC AGENTS ON DIHAPLOIDIZATION AND FERTILITY IN WINTER SQUASH (Cucurbita maxima Duch.) AND PUMPKIN (Cucurbita moschata Duch.) ANDROGENIC HAPLOIDS

2018 ◽  
Vol 17 (5) ◽  
pp. 3-14
Author(s):  
Ertan Sait Kurtar
Keyword(s):  
Cucurbita Moschata ◽  
Cucurbita Maxima ◽  
Winter Squash

scholarly journals Evaluation of Winter Squash and Pumpkin Cultivars for Age-related Resistance to Phytophthora capsici Fruit Rot

HortScience ◽  
2016 ◽  
Vol 51 (10) ◽  
pp. 1251-1255 ◽  
Author(s):  
Charles S. Krasnow ◽  
Mary K. Hausbeck
Keyword(s):  
Cucurbita Pepo ◽  
Disease Incidence ◽  
Phytophthora Capsici ◽  
Genetic Resistance ◽  
Fruit Rot ◽  
Infested Soil ◽  
Cucurbita Moschata ◽  
Cucurbita Maxima ◽  
Age Related ◽  
Winter Squash

Phytophthora capsici annually threatens production of cucurbit and solanaceous crops. Long-lived oospores produced by the pathogen incite primary infection of susceptible plants when conditions are wet. Limiting the rot of winter squash and pumpkin (Cucurbita sp.) fruits is difficult due to the long maturation period when fruits are often in direct contact with infested soil. Genetic resistance to fruit rot is not widely available within Cucurbita sp.; however, age-related resistance (ARR) to P. capsici fruit rot develops in specific cultivars during maturation. The objective of this study was to evaluate the fruits of 12 cultivars of Cucurbita pepo, Cucurbita moschata, and Cucurbita maxima for ARR to P. capsici using a mycelial-plug inoculation method. All Cucurbita pepo and Cucurbita moschata cultivars displayed ARR; 7 days postpollination (dpp) fruits were susceptible, limited lesion development occurred on fruits 22 dpp, and lesions did not develop at 56 dpp. Disease developed on both Cucurbita maxima cultivars tested at 7, 14, 22, and 56 dpp. Firmness of fruit exocarps was measured with a manual penetrometer. Exocarp firmness of all cultivars increased during maturation; however, there was no correlation between firmness and disease incidence among cultivars at 22 dpp (R2 = −0.01, P = 0.85). When fruits of cultivars expressing ARR at 22 dpp were wounded before inoculation, fruit rot developed.

scholarly journals Production of callus mediated gynogenic haploids in winter squash (Cucurbita maxima Duch.) and pumpkin (Cucurbita moschata Duch.)

2018 ◽  
Vol 54 (No. 1) ◽  
pp. 9-16 ◽  
Author(s):  
E.S. Kurtar ◽  
A. Balkaya ◽  
M. Ozbakir Ozer
Keyword(s):  
Dichlorophenoxyacetic Acid ◽  
Naphthaleneacetic Acid ◽  
Ms Medium ◽  
Cucurbita Moschata ◽  
Cucurbita Maxima ◽  
Culture Time ◽  
Irradiated Pollen ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Winter Squash ◽  
Indole 3 Acetic Acid

Although haploids were successfully produced via irradiated pollen technique and anther culture in Cucurbita maxima and Cucurbita moschata, the haploidization efficiency is still low due to genotype dependence. Thus, as an alternative technique, the efficacy of the ovule culture was investigated. Ovules were extracted at different flowering time and then cultured on a solid MS medium supplemented with 2,4-dichlorophenoxyacetic acid (2,4-D), benzylaminopurine (BAP), thidiazuron (TDZ), and naphthaleneacetic acid (NAA) to induce callogenesis and plant regeneration. The gynogenic response was influenced by the combination of plant growth regulators, genotype and culture time. The medium containing of 4.0 mg/l BAP + 0.05 mg/l NAA + 0.1 mg/l TDZ provided the highest response at anthesis time. Plantlets were rooted and elongated on a solid MS medium supplemented with 0.01 mg/l indole-3-acetic acid (IAA) + 1.0 mg/l BAP. The ploidy observations of 122 plants revealed that 70 plants were haploid, 46 plants were diploid and the others were mixoploid.  

scholarly journals The world of pumpkins

2009 ◽  
pp. 46-49
Author(s):  
G.A. Khimich ◽  
V.P. Kushnereva
Keyword(s):  
Research Group ◽  
Moscow Region ◽  
High Yield ◽  
Cucurbita Moschata ◽  
Cucurbita Maxima ◽  
Vegetative Period ◽  
The World ◽  
Winter Squash

Genus Cucurbita includes about 30 species. In Russia the genus is mostly presented by 3 following species: winter squash (Cucurbita maxima Duch); acum squash (Cucurbita pero), they include marrow, Pattypan squash; butternut squash (Cucurbita moschata Duch).The research group of the institute has bred cultivars of pumpkin, marrow type and Pattypan squash with high yield and cold resistant abilities, resistant to pathogens. All these cultivars meet all high requirements of the market. With the use of all offered cultivars it has become possible to grow them one by another like a conveyer during a vegetative period in Moscow region.

Development and Release of the Novel Near-oblate Butternuttype Squash Variety `Butterbowl'

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 472g-473
Author(s):  
D.P. Coyne ◽  
J.M. Reiser ◽  
D. Smith ◽  
L. Sutton ◽  
D. Lindgren ◽  
...  
Keyword(s):  
Fruit Weight ◽  
Microwave Oven ◽  
Fruit Rot ◽  
Moisture Loss ◽  
The Novel ◽  
Cucurbita Moschata ◽  
True Breeding ◽  
Early Maturing ◽  
Plant Habit ◽  
Winter Squash

`Butterbowl' (NE-RBN-4) is a novel, small-sized (0.8 to 1.36 kg), flavorful (sweet), early maturing (90–95 days), near-oblate butternut type winter squash variety (Cucurbita moschata Duch. Ex Poir). No Butternut squash variety is similar in shape to `Butterbowl'. `Butterbowl' (S6) was derived from selfing a near-oblate open-pollinated S4 line derived from a cross of two true breeding crookneck lines (allelic test) NE-BNCR-67-1-7 (mutant out of `Butternut 23') X golden Cushaw (Agway Co.). Total fruit yield and fruit weight of `Butterbowl' were nearly similar to Butternut `Ponca'. The total fruit weight of'Waltham' was greater than `Butterbowl' in two out of four trials. The vining habit of `Butterbowl' (1.7 to 2.0 m) is more compact than `Waltham' or `Ponca'. `Butterbowl' is suitable for small gardens with limited space due to its compact plant habit. No crookneck fruit developed in `Butterbowl' in all tests. `Butterbowl' is resistant to bacterial spot, black fruit rot, and vine borer while it is moderately susceptible to powdery mildew. `Butterbowl' fruit should be used for consumption up to 45 to 55 days after harvest because slight fruit shriveling occurs at that time due to moisture loss. The fruit cooks uniformally in a microwave oven due to its more uniform flesh thickness.

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