The effects of gene B on susceptibility to chilling injury (CI) in two types of summer squash (Cucurbita pepo L.) were investigated. Two pairs of near-isogenic lines with (BB) and without (B+ B+) gene B were included in the study: `Caserta' (B+ B+) and `Precocious Caserta' (BB) of the vegetable marrow type, and `Benning's Green Tint' (B+ B+) and `Benning's Yellow Tint' (BB) of the scallop type. Respiration and ethylene evolution at nonchilling temperature were consistently higher in marrows than in scallops. Gene B had no influence on respiratory rates at nonchilling temperatures; however, the presence of gene B enhanced the chilling-induced stimulation of respiration in both marrows and scallops. Temporal differences in the patterns of chilling-induced stimulation of ethylene evolution indicated a greater sensitivity to chilling in marrows than in scallops and in both types in the presence of gene B. Electrolyte leakage was decreased by storage at chilling temperature in both marrow genotypes and was not influenced by storage temperature in B+ B+ scallops, but was increased by storage at chilling temperature in BB scallops. Therefore, electrolyte leakage was not a good CI index for these summer squash.
Harry S. Paris, Peter J. Stoffella and Charles A. Powell
`Striato d'Italia' (cocozelle group) and `Clarita' (vegetable marrow group) summer squash were grown in the greenhouse and field in the presence of sweetpotato whiteflies (Bemisia tabaci Germ.) and their susceptibility to leaf silvering was compared. Silvering was less severe in `Striato d'Italia' in the greenhouse and field.
Harry S. Paris
Summer squash (Cucurbita pepo L.) is grown in many temperate and subtropical regions, ranking high in economic importance among vegetable crops worldwide. A native of North America, summer squash has been grown in Europe since the Renaissance. There are six extant horticultural groups of summer squash: cocozelle, crookneck, scallop, straightneck, vegetable marrow, and zucchini. Most of these groups have existed for hundreds of years. Their differing fruit shapes result in their differential adaptations to various methods of culinary preparation. Differences in flavor, while often subtle, are readily apparent in some instances. The groups differ in geographical distribution and economic importance. The zucchini group, a relatively recent development, has undergone intensive breeding in the United States and Europe and is probably by far the most widely grown and economically important of the summer squash.
Harry S. Paris and Aviva Hanan
that, under most conditions, are harvested at 2 to 5 d past anthesis ( Paris and Maynard, 2008 ). The cultivar-groups of summer squash known as Cocozelle, Vegetable Marrow, and Zucchini are single-flowering, that is, one flower bud is produced per leaf
Les D. Padley Jr, Eileen A. Kabelka, Pamela D. Roberts and Ronald French
described ( Paris, 1986 ), which includes pumpkin, cocozelle, vegetable marrow, zucchini, acorn, scallop, crookneck, and straightneck. Phytophthora capsici can infect C. pepo at any growth stage and is capable of causing crown rot, foliar blight, and
species is divided into eight edible-fruited cultivar groups and two cultivar groups of ornamental gourds: Pumpkin (round), Cocozelle (long, bulbous cylindrical), Vegetable Marrow (short, tapered cylindrical), Zucchini (uniformly cylindrical), Orange Gourd
Njung’e Vincent Michael, Pamela Moon, Yuqing Fu and Geoffrey Meru
, Acorn, and Scallop morphotypes are in subsp. texana , whereas Cocozelle, Vegetable Marrow, Zucchini, and Pumpkin belong to subsp. pepo ( Paris, 1989 ; Paris et al., 2012 ). Cultivation of C. pepo is significantly limited by chronic losses to