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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 seedling stage continuous drought method was used to identify the drought tolerance of South China direct seeding rice variety K2 and its hybrid progenies under greenhouse conditions. The results showed that: (1) Drought resistance of direct seeding K2 was weak. This result shows that rice is resistant to direct drought and drought-resistant varieties of rice varieties. (2) The over-progeny of the drought tolerance of hybrids of K2 with weaker drought tolerance may indicate that it is possible to select materials with improved drought tolerance from the hybrid progenies of the general drought-tolerant cultivars. (3) The drought resistance ability of each tested material has a very significant and positive correlation with the amount of new root after soaking treatment. The quantity of new root can be used as the quantitative index of the drought resistance of the material. (4) There was a significant positive correlation between the amount of new roots and the plant height of the tested materials. Therefore, the plant height can also be used as an indicator of drought tolerance in the identification of drought tolerance in the same breeding group use. (5) The indica hybrid rice Indica You 63 and Xieyou 57 showed outstanding drought tolerance. This result proves that the combination of drought tolerant rice varieties breeding ideas and hybrid rice variety breeding ideas will improve the drought tolerance of rice cultivars As the adaptability of enhanced rice varieties, together with the goal of high-yielding and high-quality breeding, it is included in the breeding program of hybrid rice.