Abstract:

Biological characters and yield components were analyzed in giant embryo rice and their corresponding CK(non-ge-rice：rice without giant embryo). The main results were as follows: (1) Induced mutants possessing ge (giant embryo) genes had close similarly to the corresponding original lines in all most of agronomic traits, including plant types, major yield components (No. of productive panicles，No. of grains per panicle and seed setting percent) as well as heading date. However, ge-rice showed a significant decrease in 1000-grain weight, test weight, theoretical yield and harvest yield. The absolute and relative embryo weights of ge-rice were increased by 1.69–2.04 and 1.97–2.47 times; (2) The two ge-rice lines obtained by hybridization breeding had a little different performance in plant type, major agronomic traits and major yield component traits, but their absolute embryo weight and relative embryo weight were increased by 2.06 and 1.57, 2.42, and 2.04 times, compared with those of common rice respectively.

Key words: Giant embryo rice, Agronomic traits, Yield components, Grain shape, Embryo weight