A Preliminary Study on Photo thermo reaction of Male Fertility of Common Wheat Cultivars with Aegilops crassa Cytoplasm

In this paper,photoperiod treatments and sowing experiments have been carried out at Northwest Agricultural University for two years.The result indicated that alloplasmic lines of Triticum aestivum cv. 772,7859,F 94-111 ,Xiaoyan 4 and D 2 Xiaoyan 4 with Aegilops crassa cytoplasm showed photo period sensitive male sterility. Photoperiod had main effects on fertility, and temperature had additional effects. Long photoperiod caused sterility,but if temperature was higher, it took longer photoperiod to convert fertility. Photoperiod sensitivity of alloplasmic lines had correlation with their nuclear donars. Male sterility was expressed as pistillody of stamens, pollen bearing, stamen regression and another indehiscence. Alloplasmic lines with hexaploidy Aegilops crassa cytoplasm showed difference with the same lines with tetraploidy cytoplasm. The former had a higher sensitivity to photoperiod. Because of nucleo cytoplasmic interaction, the alloplasmic lines showed different sensitivity to photoperiod variation. It is possible to select new male sterile lines suitable for different ecological conditions.