Effects of Rht10,a Dominant Dwarfing Gene on Grain Filling of Wheat
Li Qianqian
Zhang Weidong
Gao Jianhua
Zhang Shuying
Jiang Xiaoli
Gao Qingrong
Abstract：In order to study the mechanisms of reducing grain weight of Rht10,a dormant dwarfing gene in Triticum aestivum,two near isogenic lines,Lumai 15 and Rht10 Lumai 15 were selected as experimental materials and the dynamic changes of grain weight during grain filling stage were measured and analyzed by Logistic equation fitting.The results showed that the grain weight of the two lines showed “S”shape curve;the grain weight of Rht10 Lumai 15 was always lower than that of Lumai15,and the decreasing amplitudes were between 1.17% and 35.70%.The changes of grain filling rate showed a single peak curve,and the grain fill-ing rate in Rht10 Lumai 15 was higher than that in Lumai 15 during the middle stage.The results of Logistic equation fitting showed that compared with Lumai 15,the appearance of maximum grain filling rate in Rht10 Lumai 15 was advanced with 1.57 days;the maximum grain filling rate was 0.26 g per 100 grains one day higher;the grain filling duration was 10.08 days shorter,and the active growing duration was 11.12 days shor-ter.The duration of middle and later stage of grain filling in Rht10 Lumai 15 was obvious shorter than that in Lumai 15.Thus,the effects of Rht10 on grain weight were involved in the whole grain development duration. The gene increased the maximum grain filling rate and grain filling period,especially the middle and late peri-od,which might result in the reduction of wheat grain weight.
Keywords：Rht10 near isogenic linesLumai15Logistic curveGrain filling rateFilling duration
Publication Date：2015-07-02
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 33-37 )