晋旱125×(昔野×501)杂交后代抗旱生理指标的研究

Research on Physiological Indexes of Drought Resistant Hybrid Descendants of Jinhan 125×(Xiye×501)

大豆的抗旱性是一个受许多因素影响的复杂的数量性状,不能简单地用单一指标来反映抗旱性的强弱,而应该结合多种指标进行综合评价。经测评,初步认为供试材料抗旱性从强到弱的次序为:晋旱125,73-2(圆叶紫花),昔野×501,73-1(尖叶白花),73-3(圆叶白花),73-4(尖叶紫花)。

In this study, four special representative types from a cross between Jinhan 125 ×（ Xieye ×501 ） were selected as test materials, they were 73 - 1 （sharp leaf and white flower）, 73 - 2 （round leaf and purple flower）, 73 - 3 （ round leaf and white flower） ,73 -4（sharp leaf and purple flower）. By application of two treatments of water supply and drought coerce, physiological indexes relevant to drought - resistance such as relative water content, ability of water holding, proline content were determined in the periods of young plant and flower - podding. Additionally, agricultural characters such as height of plant, total pods, hundred - seed weight and so on were comprehensively analyzed. Also, differences in drought - resistance of parents and descendants were comprehensively evaluated by subordinate function value. Results show： Drought - resistance of soybeans is a quantitative character influenced by various factors, it is not able to reflect drought - resistance with a single index instead of comprehensive evaluation combining with various indexes. After assessment, the order of drought - resistance of the group was preliminarily hold as following： Jinhan 125, 73 -2（round leaf and purple flower）, （Xiye ×501 ） ,73 - 1 （sharp leaf and white flower）, 73 -3 （round leaf and white flower） ,73 -4（ sharp leaf and purple flower）.