| Effects of water and fertilizer coupling on growth and protective enzyme activities of dwarf rootstock Fuji sapling under water stress |
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| DOI：10.7606/j.issn.1000-7601.2022.01.17 |
| Key Words: drip irrigation water stress NPK dwarf rootstock Fuji sapling growth protective enzyme activity |
| Author Name | Affiliation | | SHI Meijuan | Shanxi Agricultural University Pomology Institute, Taiyuan, Shanxi 030031, China | | XU Haihong | Shanxi Agricultural University Pomology Institute, Taiyuan, Shanxi 030031, China | | GUO Hua | Shanxi Agricultural University Pomology Institute, Taiyuan, Shanxi 030031, China | | YANG Kai | Shanxi Agricultural University Pomology Institute, Taiyuan, Shanxi 030031, China | | DOU Yanxin | Shanxi Agricultural University Pomology Institute, Taiyuan, Shanxi 030031, China |
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| Abstract: |
| In order to investigate the effects of 20%θf and 40%θf water stress coupled with elements N, P and K on growth physiology and drought resistance of Fuji sapling under drip irrigation, a pot experiment was carried out using Fuji sapling with 3 a short stocks as experimental materials in 2019-2020, using incomplete orthogonal design scheme “3414”. Morphological indexes, osmotic regulation substances, protective enzyme activities and MDA content of Fuji saplings treated by short stock were analyzed. The results showed that when N 150 mg·kg-1 was applied under mild (40%θf) water stress, the minimum decrease of shoot growth was 9.95%. The relative chlorophyll content increased by 41.80% when K 250 mg·kg-1 was applied. The decrease of leaf area was the smallest under drought stress (40%θf,20%θf). MDA content decreased by 45.76% when P 35 mg·kg-1 was applied. The relative conductivity decreased by 15.66% when P 70 mg·kg-1 was applied.When N 150 mg·kg-1 was applied under severe (20%θf) water stress, the minimum decrease of shoot growth was 14.71%. When P 70 mg·kg-1 was applied, the leaf area decreased by 7.77%. When P 70 mg·kg-1 was applied, the relative chlorophyll content decreased 19.77%, and MDA content decreased 61.32% when N 100 mg·kg-1, P 70 mg·kg-1, and K 250 mg·kg-1. The relative conductivity increased by 6.49% when P 105 mg·kg-1 was applied. The leaf water potential difference maintained the medium drought level (0.5~1.0 MPa) when applying N 100 mg·kg-1 and K 125 mg·kg-1 under light and severe drought stress, which was conducive to the normal growth of various morphological indexes of Fuji saplings. Under mild water stress (40%θf), the osmotic adjustment substances of Fuji sapling increased by 157.19% at N 150 mg·kg-1, soluble sugar content at N 100 mg·kg-1, P 70 mg·kg-1, K At 250 mg·kg-1, the maximum increase is 112.01%; Protective enzyme activity: POD activity increased by 147.26% and SOD activity increased by 217.92% at N 100 mg·kg-1. Under severe (20%θf) water stress, the increase of proline content was the most obvious at N 100 mg·kg-1, P 70 mg·kg-1, K 250 mg·kg-1, soluble sugar content at N 100 mg·kg-1, P 70 mg·kg-1, K At 250 mg·kg-1, the maximum increase is 131.08%; Protective enzyme activity: POD activity increased by 180.37% when N 100 mg·kg-1, P 70 mg·kg-1, K 250 mg·kg-1, SOD activity increased by 973.95% when N 50 mg·kg-1. Under N 50, 100 mg·kg-1, P 35, 70 mg·kg-1, K 125 mg·kg-1 interaction, shoot growth, leaf area, relative chlorophyll content and leaf water potential difference were better than those of N, P, K alone. MDA content and relative conductivity at N 100 mg·kg-1, P 70 mg·kg-1, K 125, 250 mg·kg-1 were better than N, P, K alone. The drought\|resistance effect of osmotic regulation substance at N 100 mg·kg-1, P 70 mg·kg-1, K 250, 375 mg·kg-1 and the protective enzyme activity at N 100, 150 mg·kg-1, P 70 mg·kg-1, K 250 mg·kg-1 was better than that of N, P, K alone. Under drought stress, if N, P, K exceed the appropriate dosage range, physiological drought will result in fruit trees, not conducive to the growth of fruit trees. |
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