| 干旱胁迫对不同根型苜蓿内源激素含量的影响 |
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| 引用本文： | 汪堃,南丽丽,李景峰,梁鹏飞,陈洁,魏少萍,刘鑫.干旱胁迫对不同根型苜蓿内源激素含量的影响[J].干旱地区农业研究,2022,40(3):30-36. |
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| 作者姓名： | 汪堃 南丽丽 李景峰 梁鹏飞 陈洁 魏少萍 刘鑫 |
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| 作者单位： | 甘肃农业大学草业学院,草业生态系统教育部重点实验室, 甘肃 兰州730070 |
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| 基金项目： | 国家自然科学基金（32160327）;甘肃省重点研发计划项目（20YF3FA011） |
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| 摘 要： | 为探究不同根型苜蓿在不同生长年限的抗旱性与内源激素间的关系，采用高效液相色谱法测定根茎型、直根型、根蘖型苜蓿播种当年及生长第2年在干旱胁迫后地上与地下部内源激素吲哚乙酸（IAA）、赤霉素（GA3）、玉米素（ZT）和脱落酸（ABA）含量。结果表明，随干旱胁迫加剧，播种当年及生长第2年，根茎型、直根型和根蘖型苜蓿地上、地下部IAA和ZT含量显著降低，相比CK,IAA的年均降幅分别为50.09%、36.52%、49.15%和58.17%、53.42%、56.62%,ZT的年均降幅分别为38.11%、52.57%、36.18%和43.86%、63.94%、54.17%。ABA含量显著升高，随生长年限延长增幅降低，种植当年及生长第2年的增幅分别处于62.50%～358.82%和19.70%～85.19%之间；而GA3含量在播种当年显著下降，生长第2年中、重度胁迫下达到峰值。相比CK,播种当年地上、地下部GA3/ABA、IAA/ABA、（IAA+GA3+ZT）/ABA比值及干质量随胁迫加剧呈下降趋势；生长第2年...
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| 关 键 词： | 干旱胁迫 苜蓿 根型 内源激素 生物量 |
Effects of drought stress on endogenous hormone contents of different root\|type alfalfa |
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| WANG Kun,NAN Lili,LI Jingfeng,LIANG Pengfei,CHEN Jie,WEI Shaoping,LIU Xin.Effects of drought stress on endogenous hormone contents of different root\|type alfalfa[J].Agricultural Research in the Arid Areas,2022,40(3):30-36. |
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| Authors: | WANG Kun NAN Lili LI Jingfeng LIANG Pengfei CHEN Jie WEI Shaoping LIU Xin |
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| Abstract: | The indole acetic acid (IAA), gibberellin A3(GA3), zeatin (ZT) and abscisic acid (ABA) contents in rhizomatous rooted, tap rooted, and creeping rooted alfalfa on the aboveground and underground after drought stress were determined by the method of high\|performance liquid chromatography (HPLC) in the current and following years. The relationship between these endogenous hormones and drought resistance of different root\|type alfalfa was studied. The results showed that with the intensification of drought stress, the aboveground and underground IAA and ZT contents of rhizomatous rooted, tap rooted and creeping rooted alfalfa decreased significantly during the sowing year and the following growth year. Compared with CK, the annual average decrease of IAA was 50.09%, 36.52%, 49.15% and 58.17%, 53.42%, 56.62% respectively, and the decrease of ZT was 38.11%, 52.57%, 36.18% and 43.86%, 63.94%, 54.17% respectively. The content of ABA increased significantly, but the rate of increase was gradually declined with the extension of growth years. The increase rates in the sowing year and the following year were 62.50%~358.82% and 19.70%~85.19% respectively. However, GA3 contents remarkedly decreased during the sowing year, whereas GA3 contents reached the highest level under the moderate and severe stress during the following year. The GA3/ABA, IAA/ABA, (IAA+GA3+ZT)/ABA, and aboveground and underground dry mass decreased under drought conditions during the sowing year. The aboveground and underground IAA/ABA significantly decreased by 68.63%~70.69% and 76.77%~88.65% respectively, and GA3/ABA and (IAA+GA3+ZT)/ABA increased first and then decreased during the following next year. The GA3/ABA, IAA/ABA, and (IAA+GA3+ZT)/ABA were lowest in rhizomatous rooted alfalfa and were highest in tap rooted alfalfa under the same drought stress. There were positive correlations between dry weight of aboveground part and GA3, IAA, and ZT contents in leaves and stems as well as between dry weight of underground part and GA3, IAA, and ZT contents in roots while ABA content in leaves and stems and in roots was negatively correlated with dry weight of aboveground part and underground part, respectively. Therefore, rhizomatous rooted and creeping rooted alfalfa had better adaptability to drought stress. |
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| Keywords: | drought stress alfalfa root type endogenous hormone biomass |
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