Causal Analysis of Yield-increase by Introgression of Shattering Resistance Gene pdh1 in Soybean

Abstract

Shattering-resistant soybean cultivars, “Fukuyutaka A1 gou” and “Sachiyutaka A1 gou”, were bred by backcross-breeding using leading cultivars “Fukuyutaka” and “Sachiyutaka” as recurrent parents. These new cultivars were cultivated in the farmers’fields in Okayama, Hyogo, Aichi and Chiba prefectures and the experimental field of NARO institute of crop science (NICS). These shattering-resistant cultivars had a higher yield for machine harvesting and less yield-loss caused by pod shattering. The yield was increased more than 40% by delaying the harvest day. Shattering resistance caused by pdh1 mainly decreased shattering loss before harvesting and secondly shattering loss during harvesting. Yield-loss discharged from harvesting machine with crop residue was less than 3% and did not vary significantly with the shattering resistance of the cultivar. In conclusion, use of these shattering-resistant cultivars may increase the practical yield and the stability without increasing the cost and modification of processing.