| Photosynthetic and physiological response to biochemical improvement of ‘Red Globe’ grape under saline-alkali stress |
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| DOI：10.7606/j.issn.1000-7601.2018.04.31 |
| Key Words: grape saline-alkaline stress improver photosynthetic parameters chlorophyll fluorescence photosynthetic characteristic |
| Author Name | Affiliation | | WANG Yan-xiu | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Fei-hong | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WU Yun-long | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | GUO Ai-xia | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HU Ya | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHU Yan-fang | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | JIA Xu-mei | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to screen for the best improvers in grape cultivation under saline-alkaline stress and evaluate the effects of different modifiers, the experiment was conducted on 60 days of ‘Red Globe’ grape cuttings as a test materials, and the pot culture experiments were used to irrigate saline-alkaline water to study the effects of green grass (GG), dry grass (DG), potassium sulfate (PS), calcium superphosphate (CS) and ferrous sulfate (FS) on grape growth, photosynthetic and chlorophyll fluorescence parameters and physiological indicators. The results showed that with the application of improver, the growth of plant height decreased first and then increased, and the increase extent in CS treatment was the largest, reaching 151.11%. The net photosynthetic rate (Pn) , stomatal conductance (Gs) and transpiration rate (Tr) gradually decreased, and the intercellular CO2 concentrations (Ci) first increased and then decreased. The Pn and Gs in CS treatment decreased by 5.68% and 15.13%, respectively, and the decline was the the lowest compared with other treatments. The decline in Tr of FS treatment was smaller than that of other treatments,which was 48.18%, and the increase in Ci of CS treatment was 473.29% the potential photochemical activity of photosystem Ⅱ(Fv/Fo), the maximal photochemical efficiency of photosystem Ⅱ(Fv/Fm) and photochemical quenching coefficient (qP) decreased gradually with the extension of the improvement of saline-alkaline stress. and the non-photochemical quenching coefficient (qN) decreased firstly and then increased. The decrease of Fv/Fm and Fv/Fo of CS treatment was smaller than that of other treatments, which were 18.01% and 63.39% respectively. The increase of qN in CS treatment was greatest,which was 232.20%. the superoxide dismutase (SOD) and peroxidase (POD) activitiest of leaves under various improvement treatments decreased while the catalase (CAT) activity gradually increased. The SOD of FS decreased by 25.60%, which was the largest decrease compared with the other treatments. the CAT of FS increased by 42.22% which was the smallest increase compared to other treatments. Proline (Pro) content and relative electrical conductivity (REC) increased first and then decreased, the chlorophyll content decreased first and then increased. The f Pro and REC of FS treatment had the largest decrease, which was 30.63%, 7.57% respectively.The increase of chlorophyll content of FS treatment was 2.13%, which was higher than other treatments. The principal component analysis (PCA) showes that the variance contribution of the 3 principal components reaches 89.955%, and the FS treatment is the optimal. biochemical modification, Under the saline-alkaline stress, biochemical improvers can stabilize the photosynthetic apparatus function of the ‘Red Globe’ grape by educing the synergism of light trapping, heat dissipation and enzyme activity regulation. and the best improver is ferrous sulfate. |
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