Abstract:

To improve the easy threshing characteristic of fine super rice ‘Xieqingzao A/T9308’ and prolong the production life, the easy threshing restorer line T9308 was mutated by γ-ray mutation, one mutant M9308 with difficult shedding habit was selected, and new super rice combination ‘Xieqingzao A/M9308’ with medium shattering habit was selected mating. By interval sowing, the shattering habit, yield traits and rice quality traits of M9308, T9308, ‘Xieqingzao A/M9308’ and ‘Xieqingzao A/T9308’ were detailed identified in heading date, filling stage and maturity. Two years multi-point shattering losses of ‘Xieqingzao A/M9308’ and ‘Xieqingzao A/T9308’ in nature and machine cutting were investigated. The results showed that, the inheritance of difficult shedding habit in M9308 was very stable, and its shattering rate was significantly lower than the T9308 whether the environment or maturity. The shattering habit of ‘Xieqingzao A/M9308’ was similar with other Xieyou series, and significantly lower than the ‘Xieqingzao A/T9308’. The agronomic characters, economic characters and rice quality traits of the two combinations were similar. ‘Xieqingzao A/M9308’ could significantly reduce the rice loss rate in nature and machine cutting. In a word, this ‘Xieqingzao A/M9308’ had practical value of replacing the ‘Xieyou 9308’ for sustainable application in production.