黄淮海地区不同抗旱类型大豆种质资源根系特征及抗旱性研究

Studies on Root Properties and Drought-resistance for Different Types of Drought-resistant Soybean Germplasm from Huang-Huai-Hai Area

选用来自黄淮海地区不同抗旱类型 (强抗、中抗、弱抗或不抗 )大豆种质资源 2 5个 ,采用盆栽试验法 ,对其根系的主要数量特征及其与抗旱性的关系作了比较系统的研究。结果表明 ,黄淮海地区不同抗旱类型大豆品种间根系特征存在着基因型的本质差异 ;根系特征中不同性状对大豆抗旱性所起的作用是不同的 ,根总数、根总长度较大的品种表现抗旱性较强的趋势下 ,新生根数目与大豆抗旱性关系比较密切 ;苗期根系特征特别是根总数、根总长度、2级侧根数目与后期平均抗旱指数极显著相关 ,因此认为这 3个性状可作为大批量材料抗旱性筛选的早期形态指标。

different drought-resistant germplasm were used to study root quantitative characters and the relationship between the root characteristics and drought resistance with pot cultivation. The results showed that: there were significant genotype differences among germplasm. However, different characters among them played different roles in drought resistance. The varieties with more roots and longer root length had stronger drought resistance. The number of new lateral root was correlated with drought resistance. The total root number and length and the number of second lateral root were significantly correlated with average drought resistance index. Thus, the three characters could be regarded as morphologic index for early drought resistance identification.