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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (5): 906-.doi: 10.19802/j.issn.1007-9084.2020199

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Effects of high temperature and drought combined stress on physiological indexes of seedlings of different peanut varieties

  

  1. 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
  • Online:2021-11-01 Published:2021-11-01

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.

Key words: peanut, high temperature and drought, physiological indicators, photochemical reflectance index (PRI), photochemical index (PI)

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