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Moderate salt treatment alleviates ultraviolet-B radiation caused impairment in poplar plants

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Ma, Xuon [School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China] Ou, Yong-Bin [School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China] Gao, Yong-Feng [School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China] Lutts, Stanley [UCL] Li, Tao-Tao [University of Chinese Academy of Sciences, Beijing 100039, China] Yao, Yin-An [Key Laboratory of Biogeography and Bioresources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi 830011, China]

The effects of moderate salinity on the responses of woody plants to UV-B radiation were investigated using two Populus species (Populus alba and Populus russkii). Under UV-B radiation, moderate salinity reduced the oxidation pressure in both species, as indicated by lower levels of cellular H 2 O 2 and membrane peroxidation, and weakened the inhibition of photochemical efficiency expressed by O-J-I-P changes. UV-B-induced DNA lesions in chloroplast and nucleus were alleviated by salinity, which could be explained by the higher expression levels of DNA repair system genes under UV-B&salt condition, such as the PHR, DDB2, and MutSα genes. The salt-induced increase in organic osmolytes proline and glycine betaine, afforded more efficient protection against UV-B radiation. Therefore moderate salinity induced cross-tolerance to UV-B stress in poplar plants. It is thus suggested that woody plants growing in moderate salted condition would be less affected by enhanced UV-B radiation than plants growing in the absence of salt. Our results also showed that UV-B signal genes in poplar plants PaCOP1, PaSTO and PaSTH2 were quickly responding to UV-B radiation, but not to salt. The transcripts of PaHY5 and its downstream pathway genes (PaCHS1, PaCHS4, PaFLS1 and PaFLS2) were differently up-regulated by these treatments, but the flavonoid compounds were not involved in the cross-tolerance since their concentration increased to the same extent in both UV-B and combined stresses. © The Author(s) 2016.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2016
Language Anglais
Journal information "Scientific Reports" - Vol. 6, no.32890 (2016)
Peer reviewed yes
Publisher Nature Publishing Group ((United Kingdom) London)
issn 2045-2322
e-issn 2045-2322
Publication status Publié
Affiliation UCL - SST/ELI/ELIA - Agronomy
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Bibliographic reference Ma, Xuon ; Ou, Yong-Bin ; Gao, Yong-Feng ; Lutts, Stanley ; Li, Tao-Tao ; et. al. Moderate salt treatment alleviates ultraviolet-B radiation caused impairment in poplar plants. In: Scientific Reports, Vol. 6, no.32890 (2016)
Permanent URL http://hdl.handle.net/2078.1/182868