The Photosynthesis, Na+/K+ Homeostasis and Osmotic Adjustment of Atriplex canescens in Response to Salinity

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dc.contributor.authorPan, Ya-Qingen
dc.contributor.authorGuo, Huanen
dc.contributor.authorWang, Suo-Minen
dc.contributor.authorZhao, Bingyu Y.en
dc.contributor.authorZhang, Jin-Linen
dc.contributor.authorMa, Qingen
dc.contributor.authorYin, Hong-Juen
dc.contributor.authorBao, Ai-Keen
dc.contributor.departmentSchool of Plant and Environmental Sciencesen
dc.date.accessioned2019-04-29T13:01:15Zen
dc.date.available2019-04-29T13:01:15Zen
dc.date.issued2016-06-17en
dc.description.abstractAtriplex canescens (fourwing saltbush) is a C-4 perennial fodder shrub with excellent resistance to salinity. However, the mechanisms underlying the salt tolerance in A. canescens are poorly understood. In this study, 5-weeks-old A. canescens seedlings were treated with various concentrations of external NaCI (0-400 mM). The results showed that the growth of A, canescens seedlings was significantly stimulated by moderate salinity (100 mM NaCI) and unaffected by high salinity (200 or 400 mM NaCI). Furthermore, A. canescens seedlings showed higher photosynthetic capacity under NaCI treatments (except for 100 mM NaCI treatment) with significant increases in net photosynthetic rate and water use efficiency. Under saline conditions, the A, canescens seedlings accumulated more Na+ in either plant tissues or salt bladders, and also retained relatively constant K+ in leaf tissues and bladders by enhancing the selective transport capacity for K+ over Na+ (ST value) from stem to leaf and from leaf to bladder. External NaCI treatments on A, canescens seedlings had no adverse impact on leaf relative water content, and this resulted from lower leaf osmotic potential under the salinity conditions. The contribution of Na+ to the leaf osmotic potential (Psi s) was sharply enhanced from 2% in control plants to 49% in plants subjected to 400 mM NaCI. However, the contribution of K+ to Psi s showed a significant decrease from 34% (control) to 9% under 400 mM NaCl. Interestingly, concentrations of betaine and free proline showed significant increase in the leaves of A, canescens seedlings, these compatible solutes presented up to 12% of contribution to Psi s under high salinity. These findings suggest that, under saline environments, A. canescens is able to enhance photosynthetic capacity, increase Na+ accumulation in tissues and salt bladders, maintain relative K+ homeostasis in leaves, and use inorganic ions and compatible solutes for osmotic adjustment which may contribute to the improvement of water status in plant.en
dc.description.notesWe are very grateful to Professor Elizabeth A. Grabau from Virginia Tech, USA, for critically reviewing the manuscript and for valuable suggestions. This work was supported by the National Basic Research Program of China (201403138701), the National Natural Science Foundation of China (31372360, 31222053), the Key Technology R & D Program of Gansu Province (144FKCA058) and the Fundamental Research Funds for the Central Universities (lzujbky-2016-4, lzujbky-2015-250).en
dc.description.sponsorshipNational Basic Research Program of China [201403138701]en
dc.description.sponsorshipNational Natural Science Foundation of China [31372360, 31222053]en
dc.description.sponsorshipKey Technology R & D Program of Gansu Province [144FKCA058]en
dc.description.sponsorshipFundamental Research Funds for the Central Universities [lzujbky-2016-4, lzujbky-2015-250]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.3389/fpls.2016.00848en
dc.identifier.eissn1664-462Xen
dc.identifier.other848en
dc.identifier.pmid27379134en
dc.identifier.urihttp://hdl.handle.net/10919/89249en
dc.identifier.volume7en
dc.language.isoenen
dc.publisherFrontiersen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectAtriplex canescensen
dc.subjectsalt toleranceen
dc.subjectphotosynthesisen
dc.subjectosmotic adjustmenten
dc.subjectsalt bladderen
dc.titleThe Photosynthesis, Na+/K+ Homeostasis and Osmotic Adjustment of Atriplex canescens in Response to Salinityen
dc.title.serialFrontiers in Plant Scienceen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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