Abstract: 【Objective】 To screen out the yield index and drought resistance of rapeseed varieties with strong drought resistance, so as to lay a foundation for breeding drought resistance varieties. 【Methods】 Under the conditions of dry-land, the agronomic traits of the materials were first compared to analyze whether there was any difference between the materials. Secondly, the drought resistance identification yield index (DRC, SSI, DRI, DI) of the materials. Comparative analyses of index, DRI and DI were carried out. Finally, suitable drought resistance identification yield indicators were selected, and rapeseed varieties with strong drought resistance were screened in the tested materials. 【Results】 The results showed that the plant height and yield of 25 tested rapeseed varieties under different drought stresses decreased to varying degrees, and the differences among the materials were significant. Among the drought resistance identification yield indicators, (1) DRC and SSI could be used to evaluate the stability of the variety, but cannot reflect the yield of the dry land; (2) The DRI did not only investigate the yield stability of rape varieties, but also took into account the dryland yield, and compared with the average yield of the same group of dryland, which was more suitable for the identification of drought resistance of rapeseed varieties. (3) The revision formula of DI utilized the yield of the control varieties, which was the same as the trend of drought resistance ability of the tested rape varieties reflected by the DRI. By taking into account the absolute yield and drought resistance coefficient of the tested varieties in dryland and water land, the high yield and drought resistance of the tested varieties were evaluated. Therefore, the DRI and DI were suitable for the comprehensive drought resistance identification of rapeseed varieties. On this basis, among the three types of test materials, according to the DRI, DI and the two habitats (drought-land and water-land), Qingza 12, Qingza 11, Dalajie, Yao 328-331 and Dahuang were selected. 【Conclusion】 The DRI and DI of rapeseed drought resistance varieties are suitable for comprehensive evaluation and identification of drought resistance. The drought resistance varieties selected from 25 rapeseed resources based on screening indicators are Qingza 12, Qingza 11, Dalajie, Yao 328-331 and Dahuang.

Key words: Brassica napus L.; Brassica juncea L. ; Brassica rapas L. ; yield; drought resistance

摘要： 【目的】筛选出油菜品种抗旱性产量指标和抗旱性较强的油菜品种,为选育抗旱油菜品种奠定基础。【方法】在旱棚鉴定条件下,比较25个油菜品种(系)的各农艺性状,分析各材料之间的差异性;比较分析供试材料的抗旱鉴定产量指标(抗旱系数、干旱敏感指数、抗旱指数、抗旱指数修订式);选取适宜的抗旱鉴定产量指标,在供试材料中筛选抗旱性较强的油菜品种。【结果】25份供试材料油菜品种在干旱胁迫下,其株高和产量均有不同程度的降低,且各材料间差异较大,具有代表性。抗旱性鉴定产量指标中,抗旱系数和干旱敏感指数可用于评价品种稳产性,但不能反映品种旱地的产量;抗旱指数在考察品种产量稳定性的同时,兼顾了品种旱地产量,并与同组旱地平均产量相比较,更适合用于油菜品种抗旱性鉴定产量指标;抗旱指数修订式利用了对照品种的产量,与抗旱指数所反映的供试油菜品种的抗旱能力大小趋势相同,兼顾供试品种在旱地和水地的绝对产量和抗旱系数,评价供试品种的丰产性和抗旱性。抗旱指数和抗旱指数修订式适合于油菜品种的综合抗旱性鉴定。【结论】3类供试材料中根据各品种抗旱指数、抗旱指数修订式及2种生境(旱区和水区)于对照品种比较共筛选出青杂12号、青杂11号、大辣芥、姚328-331和大黄油菜5个抗旱品种。

关键词: 甘蓝型油菜, 芥菜型油菜, 白菜型油菜, 产量, 抗旱性