摘要
为给叶片水势(LWP)在小麦抗旱节水鉴定中的应用提供依据,设置干旱胁迫(D)和非胁迫(W)两种水分处理,研究了21个冬小麦品种苗期(X1)、抽穗期(X2)和乳熟期(X3)的LWP变化及其与籽粒产量(Y)、抗旱指数(DI)、水分利用效率(WUE)的关系。结果表明,干旱胁迫导致所有品种LWP下降,下降幅度在品种间和生育期间存在差异,苗期、抽穗期和乳熟期的LWP分别平均下降0.34、0.21和0.12 MPa,品种变异系数分别为-44.1%、-43.3%和-98.3%。随生育进程的变化,LWP下降幅度有70%的品种呈"偏正态"型减小,30%呈"L"型减小。聚类分析表明,抗旱品种的LWP遗传距离小(0.6~0.7),水地品种大(0.85~0.95)。回归与通径分析表明,LWP与Y、DI、WUE均呈极显著正相关,相关系数为rDI>rWUE>rY,但不同生育期LWP对抗旱节水性有交互弥补或抵消的效应。综合分析认为,抽穗期LWP选择-0.2527^-0.1702 MPa,利用LWPX1、LWPX2、LWPX3相互结合评价抗旱性;以LWPX2为主,兼顾LWPX3评价WUE、兼顾LWPX1评价产量的策略,是抗旱节水小麦较理想的水分状况评价与选择决策。
In order to determine the drought resistance of wheat, the LWP of 21 different winter wheat varieties under drought stress and non-drought stress were investigated at seeding stage（X1 ） , heading stage （X2）, milk-riping （X3）and its relation with yield（Y）,DI and WUE were analysed. The results showed that LMPs of all cultivars decline under drought stress, with variation among different varieties and growth stages. The LWP at X1 decreased by 0.34 MPa, at X2 by 0.21 MPa, and at X3 by 0.12 MPa, the CV （coefficient of variation） of those three stages was -44.1% ,-43.3 % and -98.3 %, respectively. The genetic distance （0.6-0.7） of the drought resistant cultivars was much less than that （0.85-0.95） of drought susceptible cultivars under non-drought stress. The decrease of LWP presented as a skewed curve in 70% cultivars with the growth and as a L curve in 30% cultivars. Analysis of regression and pathway indicated that LWP was highly correlated with Y, DI and WUE, the correlation ranked as rDI〉rWUE〉ry, but LWP at different growth stages can compensate the ability of drought resistance. To summary, the drought resistance of wheat cultivars could be determined on the basis with LWP （-0. 2527--0. 1702 MPa ） in heading stage and asisted with LWPx1 ,LWPx2 ,LWPx3 together; the evaluation of water condition of drought resistant wheats and selection could be assisted on mainly the LWPx2 with the WUE of LWPx3 and yields of LWPx1.
出处
《麦类作物学报》
CAS
CSCD
北大核心
2009年第3期453-459,共7页
Journal of Triticeae Crops
基金
国家"863计划"项目(2006AA100201)
陕西省"13115"科技创新工程重大专项
关键词
小麦
叶片水势
抗旱指数
水分利用效率
产量
Wheat
Leaf water potential （LWP）
Drought reisstance index （DI）
Water ues efficiency （WUE）
Yield （Y）
