大豆苗期耐旱性与根系性状的鉴定和分析

IDENTIFICATION AND ANALYSIS OF DROUGHT TOLERANCE AND ROOT TRAITS OF SEEDLINGS IN SOYBEANS

2003年对63份大豆品种在盆栽自然干旱和盆栽水分控制两种条件下进行苗期耐旱性鉴定,两者鉴定结果间的关联分析表明两者呈极显著相关,两者间的鉴定分级结果比较一致,筛选出一批苗期耐旱型品种。综合分析2001～2003年的大豆苗期耐旱性鉴定结果,筛选出稳定耐旱型(1 级)品种4份(晋豆14、汉中八月黄、科丰1号和园黑豆)和稳定干旱敏感型(5级)品种1份(宁海晚黄豆)。苗期耐旱隶属函数值与根系性状阃的相关分析表明,比根长、比根干重、比根表面积和比根体积等根系性状相对值与耐旱隶属函数值呈极显著相关,根总长、侧根总长、侧根数等根系性状绝对值与耐旱隶属函数值间的相关不显著,说明利用根系性状绝对值进行苗期耐旱性的评价较为牵强,而利用根系性状相对值进行耐旱品种的鉴定筛选比较可靠。

In 2003, drought tolerance of seedlings of 63 soybean varieties was identified under both conditions of natural drought and water control . There was significant relationship between the grades of drought tolerance of the two methods. However each method had advantages and disadvantages. The results of drought tolerance identification of seedlings of soybean varieties in 2001～2003 were analyzed comprehensively, it was found that 4 varieties （ Jindou 14, Hanzhongbayuehuang, Kefeng 1, Yuanheidou ） displayed strong drought tolerance steadily and 1 variety （ Ninghaiwanhuangdou ） showed high drought sensitive steadily, these five varieties could be used as standard varieties in studies of drought tolerance of seedlings in soybeans. The correlation analysis showed there was significant relationship between subordinative function value and relative root values such as relative length of roots, relative weight of dry roots, relative surface area of roots and relative volume of roots, but there wasn＇t significant relationship between subordinative function value and absolute root values such as full length of roots, full length of side roots, number of side roots etc. It was demonstrated that it was unreliable to select absolute root values as drought index, but it was reliable to use relative root values as drought index to identify drought tolerance of seedlings in soybeans.