棉花花铃期抗旱性综合评价及指标筛选

以90份国内棉花为材料,在大田采用花铃期胁迫,考察6个农艺性状和单株产量(Y值)指标,采用综合抗旱系数、因子分析、隶属性函数值、聚类分析、灰色关联度和广义遗传力分析相结合的方法,对其抗旱性进行综合评价、抗旱性划分和评价指标筛选。结果表明,基于D值相关性状指标对干旱胁迫关联度位次依次为:单株产量、有效铃数、有效果枝数、株高、单铃重、衣分、第一果枝节位。因子分析表明,3个公因子可代表棉花抗旱性72.45%的原始数据信息量。基于D值和加权抗旱系数(WDC值)的各品种抗旱性排序相近,位居前10位的抗旱品种基本相同。各品种D值与综合抗旱系数(CDC值)、WDC值之间均呈极显著正相关,广义遗传率分析表明D值的遗传率为55.4%,为最高,其次为CDC值、WDC值。各品种Y值与CDC、WDC值间极显著正相关;根据D值将试验材料划分为5个抗旱级别,可较好地反映品种的选育条件及适应地区。试验结果说明基于遗传力大小的综合抗旱指标中用D值为主要参数,WDC为辅助评价参数,评价以单株产量为主要考量目标的棉花抗旱性是适宜且必须的;以抗旱性综合评价方法进行棉花抗旱性综合评价、抗旱性划分和评价指标筛选是可行且有效的。

Screening and comprehensive evaluation of drought resistance indices of cotton at blossing and boll-forming stages

Six main agronomic traits and Yield per plant(Y) of ninety main cotton germplasm resources in China were measured at flowering and boll setting stage- under drought stress. Comprehensive drought resistance coefficient(CDC value), factor analysis, subordinate function coefficients, clustering analysis, grey relational analysis , broad-sense heritability were used to evaluate the drought resistance, classify drought resistance and select evaluation indices in tested cottons. D value based on traits related to drought stress were Correlation degree of order bits : Yield per plant(Y), Effective number , Effective fruit branch number , Plant height , Single boll weight , Lint percentage , Initial internodes of fruiting branch .Factor analysis showed that three common factors could represent 72.45% of the original information of cotton drought resistance data. The ranks of drought resistance of tested cotton sbased on drought resistance comprehensive evaluation values (D value) and weight drought resistance coefficient (WDC value) were similar. D values of tested cottons correlated positively with CDC value, WDC value and Y value.Broad-sense heritability showed that the highest rate of genetic generalized D value was 55.4%, followed by CDC value, WDC value. Y values of tested cotton salso had very significant and positive correlation with CDC value and WDC value. Tested cultivars were divided into five drought grades according to D value, and reflected the variety of breeding conditions and adaptation to regional well. Based on the comprehensive index of drought resistance, the size of heritability D value was the main parameter, assisted by WDC for evaluation parameters, with evaluation of the yield per plant as the main consideration goal, yield drought resistance of cotton were appropriate and necessary. Drought resistance comprehensive evaluation methods used in studying comprehensive evaluation of drought resistance drought resistant and screening evaluation indices in cotton were feasible and effective.