Development of a new pod dehiscence-resistant soybean cultivar 'Sachiyutaka A1 gou'
2016
Hajika, M. | Funatsuki, H. | Yamada, T. | Takahashi, K. | Hishinuma, A. | Hirata, K. | Oki, N. | Yamada, N. | Komaki, K. | Matsunaga, R.
Most soybean cultivars grown in the southwestern part of Japan do not exhibit pod dehiscence resistance, and farmers sometimes incur considerable losses of harvest owing to natural pod dehiscence and head loss during combine harvesting. 'Sachiyutaka' is a widely grown cultivar in the Kinki-Chugoku area, and it exhibits lodging resistance and high yield, and has high protein content. However, as it lacks pod dehiscence resistance, farmers are forced to harvest this cultivar during a brief period to avoid harvesting loss, and in practice, this is difficult to achieve frequently. The novel pod dehiscene-resistant soybean cultivar 'Sachiyutaka A1 gou' is a near-isogenic line of 'Sachiyutaka'; it was bred from the progeny of back-crossing lines between 'Hayahikari' (the donor parent) and 'Sachiyutaka' (the recurrent parent). 'Sachiyutaka A1 gou' has agricultural and processing characteristics similar to those of its recurrent parent 'Sachiyutaka'. 'Sachiyutaka A1 gou' exhibited yield and lodging resistance that were approximately equivalent to those of 'Sachiyutaka'; however, the time of flowering and maturity is slightly delayed, and seed protein content is slightly lower in comparison to 'Sachiyutaka'. The seed appearance of 'Sachiyutaka A1 gou' is similar to those of 'Sachiyutaka', and there are no difficulties in the cultivation and distribution system for practical use in comparison to 'Sachiyutaka'. The use of 'Sachiyutaka A1 gou' instead of 'Sachiyutaka' is expected to result in a rapid increase in soybean yield without adversely affecting farmers or end-users.
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