Studies On The Growth,Development And Mechanism Of Fertility Conversion Of Thermo-sensitive Male Sterility-Temian S-1

Temian S-1 was used as studying material, this paper studied rules of growth and development of the male sterility in natural environment, the effects of average diurnal temperature, and different sunlight on fertility conversion, mechanism of fertility conversion at different temperature. In addition, the effects of different pollination time on boll forming were studied in the paper. The main results are as follows:1. It is about 4~5 from sowing to seedling, the time of all treatment is almost same, and it is about 30~50 days from seedling to squaring according to the boll distribution figure. It is almost same for seedling and squaring time of various plants in the same treatment, and the time from seedling to squaring of early sowed treatment is longer than that of the late one. There is almost no difference between the blooming times of various plants in the same treatment. The second nodes of the first and second branches become sterile on the fifteen of July, it lasts till about twenty fifth of August, and it is about 42 days long total.2. Average diurnal temperature is the main factor that affect fertility conversion. Temian S-l become male sterility completely when average diurnal temperature of continuous 8 days is above 27.8℃ , according to the boll distribution figure. In fact, the high temperature in the first eight-day before pollen phase has affected fertility, based on the analysis of the rule of bud differentiation. Contacting above analysis and native meteorological data at the same time, we can draw a conclusion that average diurnal temperature from the last ten days of June that of August is above 27 ℃ from 2002 to 2004 , the frequency of that accounts for 82.4% in the total frequency of above 3 years.The changing average temperature of sequential five, seven and ten days before fertility conversion is 27.4℃, 27.4℃ and 27.5℃. According above analysis, it can be concluded that the effect of changing average temperature is similar to that of average diurnal temperature.