| Effects of drought stress on physiological traits of different drought\|resistant turnip seedlings |
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| DOI：10.7606/j.issn.1000-7601.2023.03.17 |
| Key Words: turnip drought stress physiological response stomatal characteristic drought\|resistant variety |
| Author Name | Affiliation | | GAO Yaning | College of Horticulture and Forestry Sciences, Tarim University, Alar, Xinjiang 843300, China
The National\|Local Joint Engineering Laboratory for Efficient and High\|Quality Cultivation and Deep Processing Technology of Characteristic Fruit Trees in Southern Xinjiang, Alar, Xinjiang 843300, China | | XUAN Zhengying | College of Horticulture and Forestry Sciences, Tarim University, Alar, Xinjiang 843300, China
The National\|Local Joint Engineering Laboratory for Efficient and High\|Quality Cultivation and Deep Processing Technology of Characteristic Fruit Trees in Southern Xinjiang, Alar, Xinjiang 843300, China | | ZHANG Kaihao | College of Horticulture and Forestry Sciences, Tarim University, Alar, Xinjiang 843300, China
The National\|Local Joint Engineering Laboratory for Efficient and High\|Quality Cultivation and Deep Processing Technology of Characteristic Fruit Trees in Southern Xinjiang, Alar, Xinjiang 843300, China | | LI Yu | College of Horticulture and Forestry Sciences, Tarim University, Alar, Xinjiang 843300, China | | CHANG Jiao | College of Horticulture and Forestry Sciences, Tarim University, Alar, Xinjiang 843300, China | | AYIMAIMU·Shawuti | College of Horticulture and Forestry Sciences, Tarim University, Alar, Xinjiang 843300, China
The National\|Local Joint Engineering Laboratory for Efficient and High\|Quality Cultivation and Deep Processing Technology of Characteristic Fruit Trees in Southern Xinjiang, Alar, Xinjiang 843300, China | | MA Guocai | Analysis and Testing Center, Tarim University, Alar, Xinjiang 843300, China |
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| Abstract: |
| Drought sensitive variety (WJC106) and drought resistant variety (WJC129) were used as experimental materials in this study to examine the physiological response of different drought resistant types of turnips to drought stress at seedling stage. The effects of drought stress on malondialdehyde, relative conductivity, antioxidant enzyme activity, osmoregulation substances, photosynthetic fluorescence and leaf stomatal morphological characteristics were examined. The results showed that drought stress significantly increased the MDA content and relative conductivity of turnip seedlings. Drought\|sensitive increases were 59.71% and 27.05%. The drought\|resistant types were 54.52% and 20.06%, and their cell membranes were damaged to a large extent. And drought resistant varieties had strong regulation ability. Under drought stress, the activity of antioxidant enzymes and the content of osmoregulation substances were significantly higher than those of drought sensitive varieties. The increases of WJC106 and WJC129 proline under drought stress were 85.22% and 88.97% and soluble protein increments were 32.51% and 58.26%. Proline and soluble protein played the main role in osmoregulation. Drought stress had a negative impact on chlorophyll content, photosynthesis and fluorescence parameters, except that it had no obvious impact on yield of effective light quanta of turnips. WJC106 was greatly affected, and WUE decreased by 71.5%, while WJC129 had relatively stable photosynthetic and fluorescence indicators, and WUE increased by 18.2%. Drought stress reduced leaf stomata, guard cells, stomatal opening and stomatal opening rate of two different drought resistant types of turnips at seedling stage. The stomatal characteristic value of drought resistant turnip was significantly higher than that of drought sensitive turnip while still maintaining high photosynthesis. The leaf surface of drought\|resistant turnip (WJC129) was covered with a waxy layer, which increased its drought resistance. The surface of the leaf was covered with a waxy layer, which increased its drought resistance. |
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