Evaluation of and selection criteria for drought resistance in Chinese semiwinter rapeseed varieties at different developmental stages

文献类型： 外文期刊

第一作者： Huang, Qian

作者： Huang, Qian;Zhao, Yongguo;Liu, Chunqing;Zou, Xiling;Cheng, Yong;Fu, Guiping;Xu, Jingsong;Zhang, Xuekun;Lu, Guangyuan

作者机构：

关键词： Brassica napus L;drought;susceptibility index;path analysis;agronomic traits

期刊名称：PLANT BREEDING （ 影响因子：1.832； 五年影响因子：1.956 ）

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收录情况： SCI

摘要： The impacts of water deficit imposed at either the germination stage or the reproductive stage on biological traits of 37 semiwinter rapeseed varieties were analysed. The osmotic stress induced by 14% polyethylene glycol had a substantial impact on seed germination and caused significant reductions in plant growth and seed vigour. Relative water content was identified as a good indicator for early screening of drought resistance. At the reproductive stage, seed yield, 1000-seed weight, height of the first branch, plant height and number of pods per plant were all markedly reduced under the exceptionally long and severe drought condition. Two of the top three resistant genotypes at the germination stage were also shown to be resistant based on the drought susceptibility index for seed yield. Phenotypic correlation and path analyses were employed to rank the relative importance of other agronomic traits with regard to seed yield. The important contributors to seed yield under drought conditions, in descending order, were as follows: 1000-seed weight, days to maturity, number of pods per plant and plant height.

分类号： S3

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