李婉玲,陈晓龙,蔡立群,王正伟,张军.PEG模拟干旱胁迫对玉米种子萌发的影响[J].干旱地区农业研究,2022,40(5):32~41
PEG模拟干旱胁迫对玉米种子萌发的影响
Effects of PEG simulated drought stress on maize seed germination
  
DOI:10.7606/j.issn.1000-7601.2022.05.04
中文关键词:  玉米  PEG模拟干旱胁迫  萌发  幼苗生长  抗旱性综合评价
英文关键词:maize  PEG simulated drought stress  germination  seedling growth  comprehensive evaluation of drought resistance
基金项目:甘肃农业大学公招博士科研启动基金(GAU-KYQD-2019-10);甘肃省耕地质量建设保护总站土肥有关试验(03721203)
作者单位
李婉玲 甘肃农业大学资源与环境学院甘肃 兰州 730070 
陈晓龙 甘肃农业大学资源与环境学院甘肃 兰州 730070 
蔡立群 甘肃农业大学资源与环境学院甘肃 兰州 730070 
王正伟 甘肃农业大学资源与环境学院甘肃 兰州 730070 
张军 甘肃农业大学资源与环境学院甘肃 兰州 730070 
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中文摘要:
      于2021年春季选取了5个甘肃省广泛种植的玉米杂交种,以先玉335为对照,采用不同浓度PEG-6000(0%、5%、15%、25%和35%)模拟干旱胁迫,分别观察、测定其发芽势、发芽率、胚根长、胚芽长、胚根干质量、胚芽干质量等萌发指标,分析干旱对其萌发的影响。结果表明:随着PEG浓度的升高,6个品种各萌发指标总体均呈下降趋势;发芽势、发芽率、胚根长、胚芽长、萌发指数、抗旱指数、贮藏物质转化率在5%~25% PEG处理时,金苹628较先玉335的增幅范围分别为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%,金苹608较先玉335的增幅范围为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%,庆单3号和五谷568较先玉335总体略有增加或增幅不明显,陇单9号略有降低。通过主成分分析和综合得分建立综合评价体系可知,不同品种玉米耐旱性由强到弱排序为:金苹628、金苹608、庆单3号、五谷568、陇单9号,且庆单3号在低浓度胁迫下具有较强耐旱性。综合比较,金苹628和金苹608抗旱性最强,庆单3号次之,五谷568较强,陇单9号较弱。
英文摘要:
      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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