| 高温干旱复合胁迫对花生幼苗生理指标的影响 |
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| 引用本文： | 李聪聪,李乃光,吴正锋.高温干旱复合胁迫对花生幼苗生理指标的影响[J].中国油料作物学报,2021,43(5):906. |
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| 作者姓名： | 李聪聪 李乃光 吴正锋 |
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| 作者单位： | 1. 聊城大学 东昌学院，山东 聊城，252000；
2. 聊城市东昌府区郑家镇政府，山东 聊城，252000；
3. 山东省花生研究所/国家花生工程技术研究中心，山东 青岛，266100 |
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| 基金项目： | 国家重点研发计划项目（2018YFD1000906）；山东省自然科学基金项目(ZR2016CM07);聊城大学东昌学院科技计划项目（2020LG004） |
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| 摘 要： | 为探讨高温和干旱复合胁迫下的花生幼苗对逆境的响应机制，以抗逆性存在差异的花生品种豫花9719和豫花9326为试验材料，对其幼苗进行昼夜温度为45℃/25℃、土壤含水量为35%~40%左右的高温和干旱复合胁迫处理，研究复合胁迫对花生幼苗生长及生理特性的影响。结果表明：胁迫条件下，豫花9719的株高和干重分别比对照组低44.3%和30.2%，差异达极显著水平；含水量、叶绿素a、叶绿素b、类胡萝卜素、花青素的含量均低于对照，其中叶绿素a的含量低4.88%，差异达显著水平，花青素含量低18.14%，差异达极显著水平；PRI、PI、Gs、Pn值分别比其对照组低12%、50.31%、75.2%、72.3%，差异均达极显著水平；MDA含量和相对电导率分别比对照组高93.1%和29.93%，差异均达显著水平；可溶性蛋白和类黄酮含量分别比对照组高104.5%和41.00%，差异均达显著水平；SOD和CAT活性分别比对照组低0.91%和3.29%，差异不显著。豫花9326的株高比其对照组低33.6%，差异达极显著水平，干重降幅不显著；含水量、类胡萝卜素、花青素的含量均比对照组低，但差异均不显著；叶绿素a和叶绿素b的含量分别比对照组高19.44%和3.39%，其中叶绿素a差异达极显著水平； PRI、PI、Gs、Pn值均比对照低，差异均不显著；MDA含量和相对电导率均比对照组高，但差异均不显著；可溶性蛋白和类黄酮含量分别比对照组高271.33%和48.96%，差异均达极显著水平；SOD和CAT活性分别比对照组高70.11%和68.8%，增幅均达显著水平。推测豫花9326对高温和干旱复合胁迫的抗性较高，主要与其较为强大的抗氧化防御系统及光合系统有关。
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| 关 键 词： | 花生 高温和干旱 生理指标 光化学反射指数 光化学指数 |
Effects of high temperature and drought combined stress on physiological indexes of seedlings of different peanut varieties |
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| LI Cong-cong,LI Nai-guang,WU Zheng-feng.Effects of high temperature and drought combined stress on physiological indexes of seedlings of different peanut varieties[J].Chinese Journal of Oil Crop Sciences,2021,43(5):906. |
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| Authors: | LI Cong-cong LI Nai-guang WU Zheng-feng |
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| Institution: | 1. Dongchang College, Liaocheng University, Liaocheng 252000,China; 2. Government of Zhengjia Town, Dongchangfu District, Liaocheng 252000, China; 3. Shandong Peanut Research Institute/National Peanut Engineering Technology Research Center, Qingdao 266100, China |
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| Abstract: | To explore the response mechanism of peanut seedlings to combined stress of high temperature and drought, the peanut varieties Yuhua 9719 and Yuhua 9326, with different stress resistance, were used as materials, and the seedlings were subjected to combined stress with temperature of 45℃/25℃ （day/night）, and 35%-40% of water content in soil. Their seedling growth and physiological characteristics indexes under compound stress were investigated. The results showed that: （1） Compared with the control group, the plant height and dry weight of Yuhua 9719 decreased by 44.3% and 30.2% under combined stress, respectively, and the difference was extremely significant.The contents of water content, chlorophyll a, chlorophyll b, carotenoid and anthocyanin were all lower than those of the control group. Among them, the reduction of chlorophyll a content and anthocyanin content reached significant and highly significant level respectively. The values of PRI, PI, GS and Pn were 12%, 50.31%, 75.2% and 72.3% lower than those in the control group, respectively, and the differences were extremely significant. MDA content and relative conductivity were 93.1% and 29.93% higher than those in the control group respectively, and the differences were significant. The contents of soluble protein and flavonoids were 104.5% and 41.00% higher than those in the control group respectively, and the differences were significant. SOD and CAT activities were 0.91% and 3.29% lower than those in the control group respectively, and the difference was not significant. （2）The plant height of Yuhua 9326 in the treatment group was 33.6% lower than that of control, the difference reached a very significant level, and the dry weight decrease was not significant; the contents of water content, carotenoid and anthocyanin were all lower than those of control group, but the difference was not significant; the contents of chlorophyll a and chlorophyll b were 19.44% and 3.4% higher than that of control group, respectively. The difference of chlorophyll a reached a significant level in 39%, the PRI， PI， Gs and Pn value was lower than the control, the difference was not significant. The MDA content and relative conductivity were higher than the control group, but the difference was not significant, and the content of soluble protein and flavonoid was 271.33% and 48.96% higher than the control group, respectively, the difference reached extremely significant level. The activities of SOD and CAT were 70.11% and 68.8% higher than the control group respectively, the increase reached significant level. It was concluded that, compared the statistics of experiment, Yuhua 9326 shows the better growth of seedling than Yuhua 9719 under heat and drought stress, because it is mainly related to the stronger antioxidant defence system and photosynthetic system of Yuhua 9326. |
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| Keywords: | peanut high temperature and drought physiological indicators photochemical reflectance index (PRI) photochemical index (PI) |
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