Photosynthetic responses to solar UV-A and UV-B radiation in low-and high-altitude populations of <Emphasis Type="Italic">Hippophae rhamnoides</Emphasis> |
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Authors: | Y Q Yang Y Yao |
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Institution: | (1) College of Life Science, Chongqing Normal University, Chongqing, 400047, China;(2) Research Institute for Fruit Resources of Karst Mountain Region, Guizhou University, Guiyang, 550025, China |
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Abstract: | Two contrasting sea buckthorn (Hippophae rhamnoides L.) populations from the low (LA) and high (HA) altitudinal regions were employed to evaluate the plant physiological responses
to solar UV-A radiation and near-ambient UV-B radiation (UV-B+A) under the sheltered frames with different solar ultraviolet
radiation transmittance. LA-population was more responsive to solar UV-A. Some modification caused by UV-A only existed in
LA-population, such as significant reduction of leaf size, relative water content, and chlorophyll (Chl) b content as well as δ13C elevation, coupled with larger increase of contents of total carotenoids (Cars). This higher responsiveness might be an
effective pre-acclimation strategy adapting for concomitant solar UV-B stress. Near-ambient UV-B+A radiation caused significant
reduction of leaf size and Chl content as well as slight down-regulation of photosystem 2 activity that paralleled with higher
heat dissipation, while photosynthetic rate was modestly but significantly increased. The higher photosynthesis under near-ambient
UV-B+A radiation could be related to pronounced increase of leaf thickness and effective physiological modification, like
the increase of leaf protective pigments (Cars and UV-absorbing compound), constant high photochemical capacity, and improved
water economy. |
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Keywords: | Additional" target="_blank">Additional abscisic acid carotenoids chlorophyll content and fluorescence intra-specific response photosystem 2 quenching photochemical and non-photochemical sea buckthorn relative water content stomatal conductance water use efficiency |
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