| Correlation analysis of quality characteristics and evaluation of simulated drought resistance at germination stage of Brassica juncea |
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| DOI：10.7606/j.issn.1000-7601.2023.05.01 |
| Key Words: Brassica juncea quality drought tolerance identification germination stage fatty acids correlation analysis |
| Author Name | Affiliation | | YUAN Xiaoyan | School of Agriculture，Yunnan University，Kunming, Yunnan 650500, China
Industrial Crop Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan 650205, China | | FU Minglian | Industrial Crop Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan 650205, China | | HE Liu | School of Agriculture，Yunnan University，Kunming, Yunnan 650500, China | | LI Genze | Industrial Crop Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan 650205, China | | DENG Chengshi | Yanjin County Agricultural Technology Extension Center, Yanjin, Yunnan 657500, China | | CHEN Xiaoyan | Dali Agricultural Science Extension Research Institute, Dali, Yunnan 671600, China | | LIU Jue | Dehong Agricultural Technology Extension Station, Mangshi, Yunnan 678400, China | | SU Shiqiang | Yanjin County Agricultural Technology Extension Center, Yanjin, Yunnan 657500, China | | ZHANG Yusong | Industrial Crop Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan 650205, China | | ZHANG Lifan | Industrial Crop Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan 650205, China | | LIU Feihu | School of Agriculture，Yunnan University，Kunming, Yunnan 650500, China |
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| Abstract: |
| To study the drought resistance of different Brassica juncea germplasm, explore the relationship between rapeseed fatty acids and drought resistance during germination, and facilitate the screening of drought resistant germplasm, this study used PEG-6000 to simulate moderate and severe drought stress to examine the drought resistance and its correlation with quality traits of 193 Brassica juncea accessions during germination. The results showed that the fatty acid composition of the tested materials had rich variations, especially the coefficient of variation of erucic acid, arachidonic acid, and oleic acid, all exceeding 50%. Both moderate and severe drought stress significantly affected the germination of rapeseed. Under severe drought stress, there was a greater difference in the relative germination rate of the test materials, with a coefficient of variation of 81.66% to 112.88%. The drought tolerance of Brassica juncea during germination was generally high, and there was a highly significant positive correlation between the drought tolerance of materials under two different degrees of drought stress conditions, with a correlation coefficient of approximately 0.35~0.56. The drought resistance of Brassica juncea was related to the content and composition of fatty acids, especially the composition of fatty acids. High content of ultra\|long chain fatty acids and low content of long chain fatty acids were beneficial for the adaptation of Brassica juncea to drought during germination. Using linkage cluster analysis to comprehensively evaluate the drought resistance performance of materials under two different stress conditions, 20 Brassica juncea accessions with strong comprehensive drought resistance were selected. Of which only 3 were low erucic acid and over 80% had an erucic acid content greater than 25%. |
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