| Photosynthetic physiological response of Xanthoceras sorbifolia under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2014.05.010 |
| Key Words: Xanthoceras sorbifolia drought-stress photosynthesis fluorescence parameter |
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| Abstract: |
| A pot-cultivation experiment was performed to investigate the photosynthetic physiology of X.sorbifolia under the drought stress. Two varieties of X.sorbifolia from different provenances were used to systematically study the phtotosynthetic physiology under the drought stress. The results showed that: (1) Under the drought stress, the net photosynthetic rate, stomatal conductance, transpiration rate and chlorophyll content decreased in varying degrees both in the leaves of X.sorbifolia Compared to X.sorbifolia from Yan′an, Shaanxi with the low drought-resistance, the net photosynthetic rate, stomatal conductance, transpiration rate and chlorophyll content decreased more slowly. In the leaves of X.sorbifolia from Kaishi, Xinjiang with high drought-resistance. (2) Under the light drought stress, stomatal restriction was the main factor for the Pn’s decreased in the leaves of both the two varieties of X.sorbifolia, while the non-stomatal restriction was the main factor for the Pn’decrease under the medium and severe drought stress. (3) The result of fluorescence experiment of PSⅡ Reaction Center indicated Fv/Fm and Fv/Fo decreased in both X.sorbifolia under the drought stress, the quenching of chlorophyll fluorescence (qP) decreased, and non-photochemical quenching of chlorophyll fluorescence(qNP) increased for both X.sorbifolia under the drought stress. In general, compared to X.sorbifolia with the low drought-resistance, Fv/Fm and Fv/Fo had a smaller decrease, qP had a smaller decrease and qNP had a bigger increase in the leaves of X.sorbifolia under the drought stress. |
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