| Effects of PEG simulated drought stress on maize seed germination |
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| DOI：10.7606/j.issn.1000-7601.2022.05.04 |
| Key Words: maize PEG simulated drought stress germination seedling growth comprehensive evaluation of drought resistance |
| Author Name | Affiliation | | LI Wanling | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Xiaolong | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CAI Liqun | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG Zhengwei | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Jun | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Five maize hybrids widely planted in Gansu Province were selected in the spring of 2021 and compared with Xianyu 335. Different concentrations of PEG-6000 (0%, 5%, 15%, 25% and 35%) were used to simulate drought stress. The germination potential, germination rate, radicle length, germ length, dry weight of radicle, dry weight of germ were observed and measured, and the effect of drought on germination was analyzed. The results showed that the indexes of six maize varieties had a downward trend with the increase of PEG concentration. When treated with 5%~25% PEG, the increase range of Jinping 628 compared with Xianyu 335 was 44.8%~100.0%, 58.8%~137.5%, 106.0%~132.8%, 31.0%~60.5%, 46.1%~147.9%, 25.3%~112.8%, 15.7%~141.8%, and the increase range of Jinping 608 compared with Xianyu 335 was 28.1%~237.5%, 38.2%~250.0%, 115.7%~271.6%， 26.8%~51.0%, 52.8%~335.4%, 22.3%~248.5%, 21.7%~146.4%. Qingdan 3 and Wugu 568 increased slightly or did not increase significantly compared with Xianyu 335, and Longdan 9 decreased slightly. According to the comprehensive evaluation system established by principal component analysis and comprehensive score, the order of drought tolerance of different maize varieties from strong to weak was: Jinping 628, Jinping 608, Qingdan 3, Wugu 568, Longdan 9. Qingdan 3 had stronger drought resistance under low concentration stress. In summary, Jinping 628 and Jinping 608 had the strongest drought resistance, followed by Qingdan 3 and Wugu 568. Longdan 9 showed the weakest drought resistance. |
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