Moderate salt treatment alleviates ultraviolet-B radiation caused impairment in poplar plants
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...
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Veröffentlicht in: | Scientific reports 2016-09, Vol.6 (1), p.32890, Article 32890 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/srep32890 |