| Physiological response of ‘Zanhuangdazao’ and ‘Dongzao’ to drought stress |
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| DOI：10.7606/j.issn.1000-7601.2023.03.15 |
| Key Words: ‘Zanhuangdazao’ ‘Dongzao’ drought stress physiological mechanism |
| Author Name | Affiliation | | ZHANG Luhe | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China | | ZHAO Tong | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China | | HUANG Huali | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China | | WANG Bo | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG De | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China | | WANG Fang | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China | | WANG Duofeng | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China | | LI Yi | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Three\|year\|old ‘Zanhuangdazao’ and ‘Dongzao’ of 80 cm jujubes were used as experimental materials in this study. The growth indexes, chlorophyll contents, photosynthesis and fluorescence parameters, osmotic regulation substances contents, antioxidant enzyme activities and endogenous hormone contents were measured at 21 days after natural drought and normal watering. Physiological differences of different jujubes in response to drought stress were analyzed. The results showed that drought stress mainly inhibited the number of new shoot leaves, leaf length and jujube hanging length of two jujube cultivars. In addition, the number of shoot internodes of ‘Dongzao’ decreased by 45.5%, while the total number of jujube hanging per plant of ‘Zanhuangdazao’ decreased by 45.61%. The leaf chlorophyll total content of ‘Zanhuangdazao’ decreased by 18.94%, while that of ‘Dongzao’ decreased by 29.32% after drought stress. The photosynthetic and transpiration rates of ‘Zanhuangdazao’ were higher than those of ‘Dongzao’ after normal watering and drought stress, but there was no significant difference in fluorescence parameters between them except Fm under normal watering condition. After drought stress, the Ci of ‘Zanhuangdazao’ had no significant change, while the Ci of ‘Dongzao’ decreased by 48.07%. Compared with ‘Dongzao’, the ΦPSⅡ and qP of ‘Zanhuangdazao’ increased by 97.69% and 77.25%, respectively, while the qN decreased by 18.29% after drought stress. Under normal conditions, the relative electrical conductivity, MDA and Pro contents of leaves of the two jujube cultivars were not significantly different. The soluble sugar and soluble protein contents of ‘Zanhuangdazao’ were 148.29% and 12.59% higher than those of ‘Dongzao’, respectively, indicating that ‘Zanhuangdazao’ had a strong ability of soluble sugar metabolism. After drought stress, the relative electrical conductivity of ‘Dongzao’ was 16.01% higher than that of ‘Zanhuangdazao’, and the contents of Pro and soluble protein were 35.49% and 35.98% lower than those of ‘Zanhuangdazao’, indicating that ‘Zanhuangdazao’ had stronger ability to maintain cell membrane stability and osmoregulation. Under normal conditions, there was no significant difference in SOD and POD activities between the two jujube cultivars, and CAT activity of ‘Dongzao’ was 23.06% lower than that of ‘Zanhuangdazao’. After drought stress, the SOD and POD activities of ‘Zanhuangdazao’ were 25.77% and 76.82% higher than those of ‘Dongzao’, respectively, indicating that ‘Zanhuangdazao’ had a stronger free radical scavenging ability. Under normal conditions, ZR and IAA contents in leaves of ‘Zanhuangdazao’ were higher than those of ‘Dongzao’, but GA3 and ABA contents were not significantly different. After drought stress, the contents of four hormones in ‘Zanhuangdazao’ were significantly higher than those in ‘Dongzao’, which finally resulted in the great difference of GA3/ABA and ZR/ABA between them. In conclusion, compared with drought\|sensitive jujube cultivar ‘Dongzao’, the drought\|tolerant cultivar ‘Zanhuangdazao’ had metabolic advantages in anti\|aging and shedding, maintaining cell membrane stability and osmotic balance, scavenging free radicals, and improving electron transport efficiency of PSII reaction center, which would be the main physiological mechanism of drought resistance and high yield. |
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