The Selection of Millet Photo(thermo)sensitive Sterile Line 821 and a Study on the Relation of Sterility to Illumination and Temperature
Zhao Zhihai Cui Wensheng Du Gui Yang Shaoqing (Zhangjiakou Baxia Agricultural Institute, Shalingzi 075131)
The millet variety 292 ,a photosensitive sterile source,was crossed as the male parent with several millet varieties of different ecological types and the photo(thermo)sensitive sterile line 821 was selected from the cross combination Bagu239×292 by multiple generation selection. The results were as follows:(1)Sterility was induced by long day and fertility was caused by short day. Spike growing cone elongation to pistil and stamen differentiation was the sensitive period when fertility and sterility were transferred by light. (2)Quadrant stage was the period when fertility was affected availably by temperature and the effect of temperature was significant under short day condition, but not significant under long day condition.(3)The sterility was controlled by a pair of recessive nuclear genes.(4)In shalingzi, the area of spring millet, all plants of 821 were sterile at different sowing time when day length was 15 hours,but in southern area of Hebei, the plants of 821 were sterile for early sowing and fertile for late sowing under natural photoperiod condition.