甘蓝型油菜苗期抗旱性鉴定及综合抗旱指标筛选

为系统评价甘蓝型油菜（Brassica napus L.）苗期的抗旱性，筛选出合理的油菜抗旱指标，为区域栽培提供材料和理论依据，对10种甘蓝型油菜品种和材料采取持续干旱（控水15d）和正常浇水两种处理，针对温室控水试验结果，分析干旱胁迫对油菜生理生化、生长发育、根系形态等34个指标的影响，结合综合抗旱系数、因子分析和隶属函数进行综合评价；在此基础上，运用聚类分析和灰色关联度分析筛选抗旱性评价指标和划分抗旱类型。结果表明，CDC值（综合抗旱系数）和加权抗旱系数均与相对产量呈显著正相关。根据CDC值，材料抗旱性由强到弱为：145027 > 绵油11 >万油27 > 渝油28 > 汉油8号>中双11号>德杂油5号>万油25 >GH06 > GH04/GH02。对CDC值聚类分析，可将10种参试材料抗旱性聚为3级，其中145027为Ⅰ级，绵油11、万油27、渝油28、汉油8号、中双11号 为Ⅱ级，德杂油5号、万油25、GH06、GH04/GH02为Ⅲ级。关联度分析结果表明，光合参数指标、含水量指标、植株 形态和根系性状指标与油菜苗期的抗旱性关系密切。 

Seedling drought resistance and parameter screening of rapeseed

To make a systematic evaluation on drought resistance at seedling stage of rapeseed (Brassica napus L.), and to select reasonable drought-tolerant parameters for regional rapeseed cultivation, 10 rapeseed varieties were evaluated under well-watered and 15-day drought stressed treatments. Yield and a total of 34physiology and biochemistry indicators and root morphological indicators were assessed for the effects of drought on growth and yield. Methods of comprehensive drought resistance coefficient (CDC), factor analysis and subordinate function coef? ficients were combined to evaluate drought resistance comprehensively. The results showed that CDC value and weighted drought resistance coefficient value (WDC) were significantly correlated with relative yield. According to CDC value, the tested materials could be ranked in 145027 > Mianyou 11 > Wanyou 27 > Yuyou 28 > Hanyou 8 > Zhongshuang 11 > Dezayou 5 > Wanyou 25 > GH06 > GH04/GH02. According to the clustering analysis based on CDC value, the 10 materials were clustered into 3 groups. Among them, 145027 was clustered into class Ⅰ; Miany? ou 11, Wanyou 27, Yuyou 28, Hanyou 8 and Zhongshuang 11 were clustered into class Ⅱ; and Dezayou 5, Wanyou 25, GH06 and GH04/GH02 were clustered into class Ⅲ. Grey relational analysis showed that rapeseed drought re? sistance was closely correlated to photosynthetic parameter, water content, plant growth development indicators and root morphological indicators respectively.