摘要
采用苗期连续干旱法 ,在温室条件下 ,对韩国直播稻品种K2 及其杂种后代材料耐旱性进行鉴定。结果表明 :( 1)直播种K2 的耐旱性微弱。此结果说明 ,水稻耐直播与耐干旱属不同的水稻品种特性。 ( 2 )耐旱性较弱的K2 的杂交后代的耐旱性存在超亲现象 ,说明从耐旱性一般品种的杂交后代中选择耐旱性提高的材料是可能的。 ( 3 )各参试材料的耐旱能力强弱与浸水处理后的新根发生量呈极显著正相关 ,新根发生数量的多少可以作为材料耐旱性强弱的数量化指标加以应用。 ( 4 )参试材料的新根发生量与其植株高度呈极显著正相关 ,因此在同一条杂交组合同一育种世代群体的耐旱性鉴定中 ,植株高度也可作为耐旱性强弱的指标加以利用。 ( 5 )杂交中稻籼优 63、协优 5 7耐旱性表现突出 ,这一结果证明 ,可以将耐旱水稻品种选育思路与杂交稻品种选育思路结合起来 ,将提高水稻品种耐旱性作为增强水稻品种的适应性与高产、优质育种目标一起 ,纳入到杂交稻的选育计划之中。
The tolerance to drought of direct sowing rice variety——K 2 from South Korea and its progeny were identified in green house by the constant drought during seedling. The result showed: (1) the character of rice direct sowing was different with that of tolerance to drought of rice; (2) it was possible that the material with high tolerance to drought were selected in its hybrid progenies with general tolerance and (3) the ability of tolerance to drought was extremely positive significant relation with new root number after pouring water. Meanwhile, the new root number was extremely positive significant relation with plant height. The new root number and plant height were used as the index of identifying the tolerance to drought. (4) the tolerance to drought compared with hybrid combination——Shanyou 63 and Xieyou 57 was strong. It was helpful for breeding program.
出处
《安徽农业科学》
CAS
2000年第1期22-23,共2页
Journal of Anhui Agricultural Sciences
