作物学报 ›› 2022, Vol. 48 ›› Issue (5): 1210-1221.doi: 10.3724/SP.J.1006.2022.11040
雷新慧(), 万晨茜, 陶金才, 冷佳俊, 吴怡欣, 王家乐, 王鹏科, 杨清华, 冯佰利, 高金锋*()
LEI Xin-Hui(), WAN Chen-Xi, TAO Jin-Cai, LENG Jia-Jun, WU Yi-Xin, WANG Jia-Le, WANG Peng-Ke, YANG Qing-Hua, FENG Bai-Li, GAO Jin-Feng*()
摘要:
土壤盐渍化是影响农作物种子萌发出苗以及生长发育的重要限制因素, 探究外源激素对盐胁迫条件下荞麦种子萌发与幼苗生长的缓解作用具有重要意义。本试验以荞麦品种西农9976为材料, 采用培养皿萌发和盆栽发芽2种方法, 研究褪黑素(MT)与2,4-表油菜素内酯(EBR)浸种对不同盐浓度胁迫下荞麦种子萌发、幼苗生长、抗氧化酶活性、渗透调节物质的影响。结果表明, 盐胁迫增加了荞麦种子和幼苗叶片丙二醛(MDA)含量、可溶性糖含量和抗氧化酶(SOD、POD、CAT)活性, 降低了荞麦种子发芽势、发芽率和成苗率, 使荞麦种子胚芽长度、胚根长度和幼苗高度显著下降。MT、EBR浸种荞麦种子可有效缓解盐胁迫危害, 使荞麦种子发芽势、发芽率和成苗率较对照分别增加14.9%~33.3%、11.5%~27.3%和20.0%~46.2%, 显著提高荞麦种子胚根长度、胚芽长度、胚芽鲜重和干重、幼苗高度、幼苗鲜重和干重, 并显著增加荞麦种子和幼苗叶片中可溶性糖含量和SOD、POD、CAT活性, 降低MDA含量。综上所述, MT和EBR浸种均能通过提高荞麦种子保护酶活性、减少活性氧积累、增加渗透调节物质含量, 促进盐胁迫条件下荞麦种子发芽及幼苗生长, 提高荞麦的抗盐性。
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