Inheritance of Shedding Character and Formation of Abscission Layer in Rice Plant

Abstract

Present examination was performed in order to make clear inheritance of abscission layer and also easily shedding character based on the cracking abscission layer. The strength required to detach rice grain from its pedicel was measured with an unbonded strain gauge transducer and a null balancing recorder. Also, morphology of the abscission region in longitudinal sections of the pedicel was investigated. Parents used were a most easily-shedding variety of Japonica-Indica hybrid, Yushin, and a persistent veriety of Japanese paddy rice, Akibare. The former has abscission layer and parenchymatous cells presented in the abscission layer have completely collapsed at harvest time, and the latter has no abscission layer. In the F₁ plants, degree of grain shedding was similar to that of Yushin and parenchymatous cells presented in the abscission layer have completely collapsed. Therefore, it is concluded that the easily-shedding character of Yushin is dominant.