水稻激光育种的研究——Ⅰ.种子及减数分裂期幼穗激光处理诱发变异分析

Study on Rice Breeding with Laser——Ⅰ. Analysis of Variation Induced by Laser Treatment to Seeds and Young Ears at Meiosis Stage

对吉粳88水稻种子及减数分裂期幼穗进行了不同波长、功率及时间的激光处理,对种子的激光处理由于强度不足,品种性状未发生遗传变异,对幼穗的激光处理适当增加了强度,结果有的处理组合在M1和M2代均出现了变异株,其中早熟变异的出现频率最高,占变异株数的75%,其次为粒重变异、芒性变异、穗粒数变异、着粒密度变异和株高变异,占变异株数的比例分别为67%、58%、58%、50%和42%。

Seeds and young ears at meiosis stage of rice variety'Jijing 88' were treated with different wavelength, power and time of laser. Hereditary variation did not appear in seed treatment because the intensity of laser was not enough. Laser treatment to young ears was intensified. As a result, variant appeared in M1 and M2 generation on some combination. Frequency of premature variation was the highest, which account for 75% of total variation. Frequency of variation of weight per grain was the second, which account for 67%. Other variations include characteristic of awn, number of grains per panicle, the spikelet density and plant height, which account for 58%, 58%, 50% and 42% respectively.