Photosynthetic Responses of Different Grape Cultivars to Drought Stress and Their Recovery after Drought

doi:10.3969/j.issn.1000-6362.2018.11.005

Abstract

Abstract: In order to clarify the change of photosynthesis fluorescent parameters of grape leaves under drought stress, and their recovery under water treatment processing after different degree of drought stresses, taking the facility grape varieties “Kyoho” and “Summer Black” as test materials, authors conducted 5 different drought stress groups: T1 (drought stress 3d), T2 (drought stress 6d), T3 (drought stress 9d), T4 (drought stress 12d) and T5 (drought stress 15d), and taking the normal water treatment group as CK (relative moisture content of soil 70%? 80%). The results showed that the drought stress reduced photosynthetic parameters and fluorescence of grape leaf blades, and the amplitude of variation of Kyoho was larger than that of Summer Black. With 15d drought stress, photosynthetic parameter of Kyoho declined by 70%?90%, and Summer Black declined by 60%?80%. As for the fluorescence parameters in grape leaf blades, F0 increased significantly as the aggravation of drought stress, while qP, Fv/Fm, ETR, ΦPSⅡ decreased. Wherein, the ΦPSⅡ, qP, and ETR of Kyoho declined by 40.63%, 43.24%, and 57.71% respectively, while F0 increased by 48.27% under 15d drought stress. The ΦPSⅡ, qP and ETR of Summer Black declined by 26.38%, 40.00% and 59.69% respectively, while F0 increased by 50.19% under 15d drought stress. In terms of the recovery procedure after drought stress, the photosynthetic parameter recovery capability of Summer Black was greater than that of Kyoho under the comparatively low degree of stress (T1-T4), and the situation was opposite when the stress degree was high (T5). The difference of recovery level of fluorescence parameter in the two varieties was not significant.

Key words: Drought stress, Net photosynthetic rate, Stomatal conductance, Transpiration rate, Fluorescence parameters

ZHU Yu-qing, YANG Zai-qiang. Photosynthetic Responses of Different Grape Cultivars to Drought Stress and Their Recovery after Drought[J]. Chinese Journal of Agrometeorology, 2018, 39(11): 739-750.

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