Studies on Mixed Sowing Seed Production of Rice Restorer Line Xiangnonghui 887 with Small Grain Male Sterile Lines
The cost of hybrid rice seed production restricts the sustainable development of hybrid rice.In order to reduce the cost of seed production and realize the mechanization of seed production,rice restorer line Xiangnonghui 887 was used as the male parent,and small grain two-line male sterile lines Zhuo 234S,Liang 2329S and Zhan 998S were used as the female parents,to study the mixed sowing seed production technology of Xiangnonghui 887 with small grain male sterile lines from the aspects of grain size,the period from sowing to initial heading,outcrossing habits,mixed sowing ratio of the parents,seed yield and mechanical sorting after mixed harvest.The results showed that the mixed sowing seed production of Xiangnonghui 887 with three male sterile lines could achieve a good flowering synchronization.Xiangnonghui 887 showed a late flowering time,concentrated pollen shedding and sufficient pollen load.The male sterile lines all exhibited a long flowering period,an early flowering time and a high stigma exsertion rate.After mixed harvesting of the parents and mechanical sorting,the purity of the hybrid seeds reached over 99.79％.When the proportion of mixed grains of the male parent was 3.5％,the yield of mixed sowing seed production of Zhuo 234S/Xiangnonghui 887,Liang 2329S/Xiangnonghui 887 and Zhan 998S/Xiangnonghui 887 reached 3.385,3.142 and 3.013 t/hm2,respectively,which were 20.2％,16.1％and 11.1％higher than that of the traditional seed production,respectively.Therefore,the hybrid combinations of Xiangnonghui 887 with small grain male sterile lines are suitable for easy and simple mechanized mixed sowing seed production of hybrid rice.
hybrid ricerestorer lineXiangnonghui 887small grain male sterile linemixed sowing seed productionyieldpurity of hybrid seed
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