Physiological Mechanism of Heterosis in Seedling Growth of Indica F1 Rice Hybrids

Japanese Journal of Crop Science

Katsuyuki KATAYAMA¹  Librada BLANCO¹  Shigemi AKITA¹ 

关键词: Embryo;    インド型稲;    Endosperm;    F1雑種水稲;    F1 rice hybrids;    雑種強勢;    Heterosis;    胚;    Indica;    胚乳;    Seedling;    幼苗;   

DOI  :  10.1626/jcs.59.548

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

To determine the possible cause of higher seedling vigor in F1 rice (Oryza sativa L.) hybrids, embryo weight, endosperm weight, leaf area, and seedling growth performance of 16 F1 indica crosses and their parental lines were evaluated. The embryos of 16 F1 rice hybrids showed midparent heterosis and those of 11 F1 rice hybrids showed better parent heterosis (heterobeltiosis). Lower heterosis in the F2 embryos was also observed. Midparent heterosis in endosperm weight did not always appear. Seedling growth of F1 rice hybrids grown in standard nutrient solution for 16 days showed midparent heterosis and relative growth rate in each four-day interval had little heterosis. Heterosis in embryo weight and leaf area were closely related with that in seedling weight. Higher leaf area expansion related with bigger embryo was considered the primary factor for heterosis in seedling growth of indica-indica F1 rice hybrids.

【 授权许可】

Unknown