Intraspecific responses of <Emphasis Type="Italic">Fagopyrum esculentum</Emphasis> to enhanced ultraviolet B radiation |
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Authors: | Yinan Yao Yongqing Yang Yuan Li Stanley Lutts |
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Institution: | (1) College of Agronomy, Guizhou University, Guiyang, 550025, China;(2) College of Life Science, Chongqing Normal University, Chongqing, 400047, China;(3) Chinese National Centre for Appl-tech of Agri-biodiversity, Yunnan Agricultural University, Kunming, 650201, China;(4) Groupe de Recherche en Physiologie Végétale, Catholic University of Louvain, 5 (bte 13) Place Croix du Sud, 1348 Louvain-la-Neuve, Belgium |
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Abstract: | The effects of supplemental UV-B radiation on crop growth, morphology, reproduction and physiology were studied in three cultivars
of Fagopyrum esculentum Moench (buckwheat) originating from high elevation (Qinghai-Tibet plateau) and lower altitudes (The Sichuan Basin). Our results
showed that common buckwheat was sensitive to UV-B stress. Plant growth, development, and reproduction were inhibited by elevated
UV-B radiation. Plant lipid oxidation and polyphenol oxidase (PPO) activity increased with increasing UV-B radiation, along
with the concentration of phenylpropanoid compounds, superoxide dismutase (SOD) activity and ascorbic acid (Asa) concentration
were also enhanced at the lowest level of supplemental UV-B radiation but decreased at the higher level of enhanced UV-B.
While, a cultivar originating from elevated locations had lower dry matter accumulation and was more tolerant to UV-B radiation
than cultivars originating from lower elevations. The effects on leaf thickness and increased antioxidant capacity could be
linked with the improved performance of cultivar originating from high elevation when exposed to enhanced UV-B radiation.
We conclude that UV-B tolerance should be considered prior to introducing or breeding common buckwheat cultivars from lowland
cultivation to regions at high elevation such as the Qinghai-Tibet plateau. |
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Keywords: | Intraspecific responses Reproduction Common buckwheat (Fagopyrum esculentum Moench ) Phenylpropanoid metabolism UV-B radiation |
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