Cucurbit Genetics Cooperative Report 7:73-75 (article 32) 1984 Merrick, Laura C. Cornell University, Ithaca, NY 14556 and University of California, Davis, CA 95616 Gary P. Nabhan Native Seeds/SEARCH, and University of Arizona, Tucson, AZ 85721 Despite numerous experimental hybrids that have been made between Cucurbita species to determine taxonomic relationships among taxa in this genus, […]
Squash & Pumpkin Reports
Evidence of Gene Flow Between Cultivated Cucurbita mixta and a Field Edge Population of Wild Cucurbita at Onavas, Sonora
Cucurbit Genetics Cooperative Report 7:76-77 (article 33) 1984 Nabhan, Gary P. Office of Arid Lands Studies, University of Arizona, Tucson, AZ 85721 In an earlier-written note appearing in this newsletter, Merrick and Nabhan (1) suggest that natural hybridization occasionally occurs between wild Cucurbita sororia group populations and domesticated C. mixta in Mexico. Whitaker (2) has […]
Epidemics of Zucchini Yellow Mosaic Virus and Other Cucurbit Viruses in Egypt in the Spring of 1983
Cucurbit Genetics Cooperative Report 7:78-79 (article 34) 1984 R. Provvidenti New York State Agricultural Experiment Station, Cornell University, Geneva, NY 14456 H.M. Munger Cornell University, Ithaca, NY 14853 H.O. Paulus University of California, Riverside, CA 92521 In Egypt, during the spring of 1983, viral diseases were responsible for devastating epidemics in cucumber, melon, squash and […]
Further occurrence of Zucchini Yellow Mosaic Virus in the United States
Cucurbit Genetics Cooperative Report 7:80 (article 35) 1984 Provvidenti, R. and D. Gonsalves New York State Agricultural Experiment Station, Cornell University, Geneva, NY 14456 H.S. Humaydan Joseph Harris Company, Inc., Rochester, NY 14624 During 1983 zucchini yellow mosaic virus (ZYMV) occurred in cucurbits grown in New York, Florida and California. In affected fields the virus […]
Further Notes on the Silvery-Leaf Trait in Cucurbita
Cucurbit Genetics Cooperative Report 7:81-83 (article 36) 1984 Shifriss, O. Department of Horticulture and Forestry, Cook College, Rutgers University, New Brunswick, NJ 09803 The silvery-leaf trait (6) raises two issues: the biological control of its complex expression and its adaptive value. The biological control is poorly understood. But there is little doubt that, under field […]
Isozyme Studies Indicate that the Genus Cucurbita is an Ancient Tetraploid
Cucurbit Genetics Cooperative Report 7:84-85 (article 37) 1984 Weeden, N.F. New York State Agricultural Experiment Station, Cornell University, Geneva, NY 14456 The high chromosome number (2n=40) of Cucurbita suggests that this genus may be of polyploid origin. Evidence for allotetraploidy in several Cucurbita species was provided in cytogenetic studies of Weiling (3). However, remarkably few […]
Linkage between an Isozyme Locus and One of the Genes Controlling Resistance to Watermelon Mosaic Virus 2 in Cucurbita ecuadorensis
Cucurbit Genetics Cooperative Report 7:86-87 (article 38) 1984 Weeden, N.F., R.W. Robinson and F.Ignart* Dept. Horticultural Sciences, New York Agricultural Experiment Station, Geneva NY 14456 Resistance to watermelon mosaic virus 2 (WMV-2) has been found in Cucurbita ecuadorensis (2). The resistant phenotype appears to be controlled by more than one locus (1), but little is […]
A Nuclear Gene Codes for the Plastid-specific Aldolase in Cucurbita Species
Cucurbit Genetics Cooperative Report 7:88 (article 39) 1984 Weeden, N.F. Dept. Horticultural Sciences, New York State Agricultural Experiment Station, Geneva, NY 14456 At least two forms of fructose 1,6-diphosphate aldolase (EC 4.1.2.13) are present in leaves of Cucurbita species. One of these isozymes is localized in the plastid compartment while the other is cytosolic (1). […]
A Collection of Wild and Cultivated Cucurbitaceae from Zambia
Cucurbit Genetics Cooperative Report 7:89-90 (article 40) 1984 Whitaker, T.W. U.S. Department of Agriculture, Agricultural Research Service (collaborator) and University of California, San Diego, Department of Biology, P.O. Box 150, La Jolla, CA 92038 During April, May and June, 1981, the International Board for Plant Genetics Resources (IBPGR), in cooperation with the Department of Agriculture […]
1984 Squash Reports
Report No. 7 Squash and pumpkin (Cucurbita spp.) Independence of Genes Ses-B and M in Cucurbita pepo L. L.N. Bloksberg and O. Shifriss (USA) CGC 7:64-65 (1984) Potential of restriction endonuclease analysis of chloroplast DNA for the determination of phytogenetic relationships among members of Cucurbitaceae J.A. Juvik and J.D. Palmer (USA) CGC 7:66-68 (1984) Embryo culture of Cucurbita andreana and C. martinezii A.B. Malter, R.J. Lebowitz […]