| Effects of exogenous melatonin and abscisic acid on physiological characteristics in kiwifruit seedlings under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2021.04.12 |
| Key Words: melatonin abscisic acid drought stress physiological characteristics kiwifruit |
| Author Name | Affiliation | | LIU Xinling | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | PENG Yuting | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | WANG Yunmei | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | XIA Hui | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | LIANG Dong | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | HU Rongping | Institute of Plant Protection， Sichuan Academy of Agricultural Sciences, Chengdu, Sichuan 610066, China |
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| Abstract: |
| To explore the mitigation effect and mechanism of exogenous melatonin (MT) and abscisic acid (ABA) on drought stress, ‘Jinshi No.1’ kiwifruit seedlings were used as materials, and the treatment of root irrigation with 100 μmol·L-1 MT solution, foliage spraying with 25 μmol·L-1 ABA solution, and their combination under drought conditions were designed. The results showed that MT treatment increased the relative water content, water potential, and antioxidant enzyme SOD activity in kiwifruit leaves by about 9%, 39%, and 134% and reduced the MDA and H2O2 content by about 66% and 7% in the leaves, when compared with those in the drought treatment group. Meanwhile, ABA treatment increased chlorophyll content, net photosynthetic rate, dry matter accumulation, osmotic adjustment substances and antioxidant enzyme POD activity by about 7%, 40%, 52% and 41% and reduced H2O2 content by about 13.5%, when compared to those in the drought treatment group. The effect of the combination treatment was similar to that of ABA treatment, as it increased the net photosynthetic rate, dry matter accumulation, and antioxidant enzyme POD activity by about 29%, 110% and 35.5%, and reduced MDA and H2O2 content by about 44% and 6.5%, when compared to those in the drought treatment group. These findings indicated that MT played a role in improving the water retention capacity and antioxidant capacity of plants. The ABA and the combination of MT and ABA treatments had beneficial effects on promoting photosynthesis and achieving optimal growth under water limitation. |
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