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Analysis of salt-induced physiological and proline changes in 46 switchgrass (Panicum virgatum) lines indicates multiple response modes

文献类型： 外文期刊

作者： Kim, Jeongwoon 1 ; Liu, Yiming 2 ; Zhang, Xunzhong 2 ; Zhao, Bingyu 3 ; Childs, Kevin L. 1 ;

作者机构： 1.Michigan State Univ, Dept Plant Biol, E Lansing, MI 48824 USA

2.Virginia Tech, Dept Crop & Soil Environm Sci, Blacksburg, VA USA

3.Virginia Tech, Dept Hort, Blacksburg, VA USA

4.Michigan State Univ, Ctr Genom Enabled Plant Sci, E Lansing, MI 48824 USA

5.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, Sci Lab Crop Gene Resources & Germplasm Enhanceme, Minist Agr, Hainan 571737, Danzhou, Peoples R China

关键词： Switchgrass;Salt stress;Physiology;proline;Photosynthetic rate

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

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收录情况： SCI

摘要： Switchgrass (Panicum virgatum) is targeted as a biofuel feedstock species that may be grown on marginal lands including those with saline soils. Our study investigated salt stress responses in 46 switchgrass lines from the lowland and upland ecotypes by assessing physiological phenotypes and proline concentrations. Lowland switchgrass lines demonstrated less severe responses to salt stress than most upland switchgrass lines, but a number of upland lines performed as well as lowland individuals. Photosynthetic rate (PO, the most important physiological trait measured, was reduced by salt treatment in all lines. Tolerant lines showed similar to 50% reduction in P-n under salt stress, and sensitive lines exhibited similar to 90% reduction in Pn after salt stress. Proline analysis showed the largest amount of variation under salt stress with some lines exhibiting minor increases in proline, but some salt-sensitive lines demonstrated more than 5000-fold increase in proline concentration in response to salt treatment. Clustering of salt stress phenotypic responses revealed five groups of switchgrass. Lowland lines were present in two of the phenotypic clusters, but upland lines were found in all five of the phenotypic clusters. These results suggest that there are multiple modes of salt response in switchgrass including two distinct modes of salt tolerance. (C) 2016 Published by Elsevier Masson SAS.

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