Tolerance differences among small seed soybean [Glycine max] cultivars against excessive water stress conditions
2006
Cho, J.W.(Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Yamakawa, T.
Objectives of this study are to determine tolerance variability of small seed soybean cultivars against the excessive water stress (EWS) at V4 to V5 stage, and to provide the basic data to the parental selection for breeding. This experiment was carried out on a concrete bed filled up with silt loam soil in greenhouse using 22 small seed soybean cultivars. The seed yield of 22 soybean cultivars treated with EWS for 10 days at V4 to V5 stage ranged from 42 g mE-2 to 179 g mE-2. Sowonkong was the greatest yield 179 g mE-2, and Pureunkong and Sorogkong were the lowest yield 42 g mE-2. The mean pod numbers of 22 soybean cultivars treated with non-EWS and EWS were 58.6 and 37.1 per plant, respectively. The number of seed of soybeans treated with EWS also decreased about 49% of that with non-EWS. The correlation coefficient was slightly higher in 20 days (r=0.459, p0.05) after the removal of excessive water stress (REWS) treatment than in 10 days (r
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