闭颖授粉水稻CL01的抗逆性及其相适应的生理特点

Studies on the Stress Resistance and the Physiological Characters in a Cleisotogamy Rice

本文对开颖授粉水稻材料 T16 8和闭颖授粉水稻材料 CL 0 1进行了比较研究。发现在连续人工降雨和低温处理条件下 ,CL 0 1的结实率受影响较小 ;相反 ,T16 8的结实率随着处理天数的增加而迅速降低 ,说明 CL 0 1的抗逆性较强。通过对从开花前 5天到开花当天的花药和花丝的长度、浆片的大小以及在开花过程中浆片的鲜重和干重的变化的研究 ,揭示了一些与 CL 0 1闭颖授粉相适应的生理特点 ,即从开花前 5天到开花当天 CL 0 1的花药和花丝的长度以及浆片的大小增加均不明显 ,缺少了开颖所需要的机械力 ,因而闭颖。相反 ,T16 8的花药和花丝长度以及浆片的大小增加则相当明显 ;同时 ,在开花的过程中 ,T16 8的浆片鲜重和干重变化明显 ,在颖壳张开角度最大时达到最大值 ,这些因素可能和开颖有很大关系。虽然 CL 0 1的浆片鲜重有一定的变化 ,但是干重基本上没有变化 ,这说明 CL 0 1浆片鲜重的增加基本上是由于浆片吸水造成的 ,其中并不伴随物质的交换。

Studies were made on the wet endurance? low temperature and some physiological characters between cleisotogamous rice CL01 and anthesis rice T168.The results showed that in the continuous artifical rainfall, the fecundity of CL01 reduced a little, otherwise the fecundity of T168 reduced a lot, for the rain couldn′t enter glume. Low temperature treatment revealed that T168 was more sensitive to low temperature than CL01 in the definite time. From the 5 days before flowering to the day of flowering, the length of anther? filament and the size of lodicule of T168 changed a lot than that in CL01, in the process of flowering, and the fresh and dry weight had obvious increase, otherwise the dry weight of CL01 changed little in the flowering. So it can be deduced that the increase of fresh weight of CL01 mainly results from water uptake.