Breeding vegetable soybeans

Breeding vegetable soybeans

1990

S542.A8p 1988

There are no available vegetable soybean varieties adapted to the tropics and subtropics yet. Those that are tropically adapted were developed at AVRDC by crossing vegeatable soybeans adapted to temperate regions with tropical grain types. New breeding lines GC 83011-35, GC 84136-P-4-1-8 and GC 83005-9 appeared to be adapted to three seasons at AVRDC with a mean yield potential (graded pod) of 5.9, 5.6 and 5.5 t/ha respectively. Variation in yield was attributed mainly to season (31%) and G X E interaction (46%). However, variation due to genotypes was predominant in 100-seed weight (56%). From the preliminary yield trial 52 selections had 100-seed weight (dry) 35 g or more. There will be evaluated in IYT in 1989. DAIS Kaohsiung in Taiwan and Chiang Mai FCRC in Thailand cooperated on breeding vegetable soybean. Among the 14 AVRDC accessions evaluated in 10 locations in Thailand, Yoshida 1, PI 85658, Vesoy #4, Kanrich, 7016 (ck), NS #1 (ck) were found superior. A major portion of the variation in yield (79%) was due to location. Variation due to genotype was only 6.3%. Therefore, selection of site, season and management practices play a major role in increasing the yield of vegetable soybean. The rainy season is better than the dry season for growing vegetable soybeans in Thailand. Of the 48 breeding lines, 15 selections were chosen for further evaluation in 1989 at Chiang Mai, Thailand. [AS]

1988:95-101, ASIAN VEGETABLE RESEARCH AND DEVELOPMENT CENTER, PROGRESS REPORT

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