Cucurbit Genetics Cooperative Report 19:94 (article 36) 1996
Release of Three Gynoecious Pickling cucumber Inbreds: Gy 7, Gy 8, and Gy 9
Richard L. Lower, Department of Horticulture, University of Wisconsin, Madison, WI 53706 USA
Three gynoecious pickling cucumber inbreds (Gy 7, Gy 8, and Gy 9) are now available for release. Descriptions of the inbreds follow:
Gy 7: Gy 7 is an advanced selection (F10) of a determinate gynoecious pickling cucumber. The inbred was derived from a cross of Gy 4 by M21/ Gy 7 has a dark green vine with one to three laterals at high density plantings (>50,000 plants per acre) and two to five laterals at low density plantings ( <30,000 plants per acre). Fruit are longer than Gy 14A with white spines, dark green with medium size warts and slight stippling and striping. The fruit are tapered at both ends. Plants are resistant to scab, downy mildew, anthracnose and angular leaf spot under Wisconsin conditions. Some field tolerance is exhibited to both cucumber mosaic virus and powdery mildew in Wisconsin. Seed yields are equal to those of Gy 14.
Gy 7 has good combining ability for yield (fruit number) and hybrids with Gy 7 parentage have performed well in trials located in all major pickling cucumber growing areas in the United States. Staminate flower induction has been effective with silver thiosulfate.
Gy 8 Gy 8 is an advanced selection of an indeterminate, gynoecious pickling cucumber line derived from a cross of Gy 14A and a UW breeding line designated 70. UW 70 has a complicated pedigree involving the following breeding lines: MSU 7, New Hampshire PM #1 Bush, New Hampshire Tiny Dill, Chipper and SC 10. Gy 8 has moderately long, medium green vines with an indeterminate, branched habit similar to Gy 14A. Fruit are cylindrical with slightly rounded to blocky ends, light to medium green color, with white spines and moderate warts, moderate stippling and striping. Gy 8 is generally about 0.3 of an L/D unit longer than Gy 14A. Plants are resistant to scab, cucumber mosaic virus, downy mildew, anthracnose and angular leaf spot and have some field tolerance to powdery mildew under Wisconsin conditions. Seedling tests were used for those diseases that are not common in Wisconsin. Seed yields are equal to those of Gy 14A
Gy 8 has good combining ability for yield (fruit number) and hybrids with Gy 8 parentage have performed well in trials located in all major pickling cucumber growing areas in the United States. Brining quality of hybrids made with Gy 8 has been very good. Staminate flower induction has been effective with silver thiosulfate.
Gy 9. Gy 9 is similar to Gy 8 in all respects, including parentage, except for fruit color. Gy 9 fruit are dark green with moderate stippling and striping. Gy 8 and Gy 9 were separated on the basis of fruit color at an advanced generation (>F9 ), otherwise they are similar for vine type, fruit type, disease resistance, combining ability and hybrid performance.
Seed requests should be directed to Richard L. Lower, Department of Horticulture, University of Wisconsin, 1575 Linden rive,Madison !I 53706 USA. A standard inbred line research and development agreement will be forwarded to all who request seed. Upon receipt of a signed agreement seed will be sent free of charge. The agreement allows for the conduct of research and development.