小麦苗期耐旱品种筛选及其生理特性

 以收集及引进的50个小麦品种为材料，通过小麦幼苗干旱胁迫试验筛选耐旱小麦种质，结合旱胁迫相关指标测定，揭示耐旱生理指标与耐旱性能相关性。结果表明，小麦幼苗经干旱处理复水后品种间成活率差异显著，其中川麦42、西农2000和洲元936的成活率均高于65%，其他品种低于42%。进一步分析3个耐旱品种和随机选择的3个干旱敏感型品种在干旱胁迫下4种生理指标的差异表明，耐旱性小麦品种幼苗叶片中K+、可溶性糖及Pro含量均显著高于旱敏感型品种，而MDA含量降低，表明小麦苗期幼苗叶片中K⁺、可溶性糖、Pro及MDA含量与小麦耐旱性能具有相关性。

Correlation analysis of four physiological indices with droughttolerance during wheat seedlings stage

To reveal the relationship between the drought-related physiological indices and the drought-tolerant performance, 50 wheat landrace and elite accessions in total from inland and abroad are used for screening the drought-tolerant wheat germplasm during the seedling stage followed by a statistical analysis for the drought tolerant potential and the four physiological indices including the leaf potassium (K⁺), the soluble sugar, the malondialdehyde (MDA), and the proline (Pro) content. The screening result shows that the seedling survival differs dramatically after desiccation. Among them, Chuanmai 42, Xinong 2000, and Zhouyuan 936 show a high survival rate of over 65%, with the rest lower than 42%. The 4 physiological indices are determined for the above three high drought-tolerance wheat accessions and three low drought-tolerance ones (Kefeng10, Chinese Spring and Yumai 9676) selected at random. Correlation analysis shows a positive relationship between the drought resistance and the leaf K⁺, the soluble sugar, and the Pro levels while negative in terms of the MDA content, which implies a high correlation between the four selected physiological indices and the drought-tolerant performance.