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Publication Type J
Authors Guo, C. Y., X. Z. Wang, L. Chen, L. N. Ma and R. Z. Wang
Title Physiological and biochemical responses to saline-alkaline stress in two halophytic grass species with different photosynthetic pathways
Source Photosynthetica
Author Keywords ATP content gas exchange membrane permeability Na2CO3 stress proline salinity WATER-STRESS SALT TOLERANCE PLANTS ATP MEMBRANE PROLINE DROUGHT WHEAT ROOT NA+
Abstract We examined the physiological and biochemical responses of two halophytic grasses with different photosynthetic pathways, Puccinellia tenuiflora (C-3) and Chloris virgata (C-4), to saline-alkaline stresses. Plants were grown at different Na2CO3 concentrations (from 0 to 200 mM). Low Na2CO3 (< 12.5 mM) enhanced seed germination and plant growth, whereas high Na2CO3 concentrations (> 100 mM) reduced seed germination by 45% in P. tenuiflora and by 30% in C. virgata. Compared to C. virgata, P. tenuiflora showed lower net photosynthesis, stomatal conductance, intercellular CO2 concentration, and water-use efficiency under the same treatment. C. virgata exhibited also relatively higher ATP content, K+ concentration, and the K+/Na+ ratio under the stress treatments implying that salt tolerance may be the main mechanism for salt resistance in this species. Our results demonstrated that the C. virgata was relatively more resistant to saline-alkaline stress than the co-occurring P. tenuiflora; both two species adapt to their native saline-alkaline habitat by different physiological mechanisms.
Author Address [Guo, C. Y.; Ma, L. N.; Wang, R. Z.] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China. [Wang, X. Z.] Indiana Univ Purdue Univ, Dept Biol, Indianapolis, IN 46202 USA. [Chen, L.] Hubei Normal Univ, Coll Life Sci, Huangshi 435002, Hubei, Peoples R China. Wang, RZ (reprint author), Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 20 Nanxincun, Beijing 100093, Peoples R China. wangrz@ibcas.ac.cn
ISSN 0300-3604
ISBN 0300-3604
29-Character Source Abbreviation Photosynthetica
Publication Date Mar
Year Published 2015
Volume 53
Issue 1
Beginning Page 128-135
Digital Object Identifier (DOI) 10.1007/s11099-015-0094-5
Unique Article Identifier WOS:000349020700015
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