Effect of drought stress on light response characteristics of photosynthesis of Cyclobalanopsis gilva seedlings

doi:10.14088/j.cnki.issn0439-8114.2020.15.016

Abstract

Abstract: Aiming to illustrate the photosynthetic response and adaptation mechanism of Cyclobalanopsis gilva to drought stress, simulating four soil water gradients in pot culture, the one-year-old seedlings of C. gilva from three sources were used to measure the photosynthetic light responses under drought stress. The results showed that, under different drought stress treatments, the light response curves of C. gilva seedlings from three provenances were basically the same. The non-rectangular hyperbola model fit well with the light response curves of C. gilva with the determination coefficient of 0.95. With the increase of drought stress, the maximum net photosynthetic rate（P_n_max）, the apparent quantum yeild（AQE） and dark respiration rate（Rd） of the three provenances showed a decreasing trend. The seedlings of Dongkou provenance of Hunan province showed some adaptability and tolerance under mild and moderate drought stress, which showed that the Dongkou provenance of Hunan province had a stronger adaptability to drought stress among three provenances.

Key words: Cyclobalanopsis gilva, drought stress, light response of photosynthesis characteristics

CLC Number:

WU Li-jun, LI Zhi-hui, YANG Mo-hua, LI Chen-xi, LI Jia-luo, LI An. Effect of drought stress on light response characteristics of photosynthesis of Cyclobalanopsis gilva seedlings[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(15): 86-89.

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