作物学报 ›› 2018, Vol. 44 ›› Issue (7): 988-999.doi: 10.3724/SP.J.1006.2018.00988
Long LI,Xin-Guo MAO,Jing-Yi WANG,Xiao-Ping CHANG,Yu-Ping LIU,Rui-Lian JING()
摘要:
培育抗旱节水小麦品种是保障我国粮食安全的重要途径之一, 优异抗旱种质资源筛选及抗旱性评价方法的研究对于提高抗旱育种效率具有关键作用。本研究采用反复干旱法和田间直接鉴定法分别鉴定323份小麦种质苗期和成株期的抗旱性。结果表明, 随着干旱次数的增加幼苗存活率逐渐下降, 而其变异系数和广义遗传力增加。成株期单株产量抗旱系数与综合抗旱性度量值D显著正相关(R 2 = 0.609), 采用综合抗旱性度量值D有利于区分干旱对不同种质产量的影响力。苗期反复干旱存活率(DS)与单株产量的抗旱系数及综合抗旱性度量值D均无显著相关。基于反复干旱存活率筛选得到28份苗期强抗旱种质, 基于单株产量抗旱系数和综合抗旱性度量值D分别得到25和30份成株期强抗旱种质, 其中, 9份种质用2种评价方法均表现强抗旱; 21份种质在苗期和成株期均表现抗旱或强抗旱。本研究为小麦抗旱性评价方法及抗旱亲本的合理选择提供理论指导和信息支撑。
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