caa a22 4500 605480516 CHVBK 20210128100416.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s11099-015-0094-5 doi (NATIONALLICENCE)springer-10.1007/s11099-015-0094-5 Physiological and biochemical responses to saline-alkaline stress in two halophytic grass species with different photosynthetic pathways [Elektronische Daten] [C. Guo, X. Wang, L. Chen, L. Ma, R. Wang] We examined the physiological and biochemical responses of two halophytic grasses with different photosynthetic pathways, Puccinellia tenuiflora (C3) and Chloris virgata (C4), 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. The Institute of Experimental Botany, 2015 ATP content nationallicence gas exchange nationallicence membrane permeability nationallicence Na2CO3 stress nationallicence proline nationallicence salinity nationallicence C i : intercellular CO2 concentration nationallicence g s : stomatal conductance nationallicence E : transpiration rate nationallicence EC : electrical conductivity nationallicence P N : net photosynthetic rate nationallicence RDM : relative dry mass nationallicence REL : rate of electrolyte leakage nationallicence RPH : relative plant height nationallicence SGP : seed germination percentage nationallicence WUE : water-use efficiency nationallicence Guo C. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, 100093, Xiangshan, Beijing, China aut Wang X. Department of Biology, Indiana University-Purdue University Indianapolis, 723 West Michigan Street, 46202, Indianapolis, Indiana, USA aut Chen L. College of Life Sciences, Hubei Normal University, 11 Cihu Road, 435002, Huangshi, Hubei, China aut Ma L. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, 100093, Xiangshan, Beijing, China aut Wang R. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, 100093, Xiangshan, Beijing, China aut Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/1(2015-03-01), 128-135 0300-3604 53:1<128 2015 53 11099 https://doi.org/10.1007/s11099-015-0094-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11099-015-0094-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Guo C. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, 100093, Xiangshan, Beijing, China aut NATIONALLICENCE 700 1- Wang X. Department of Biology, Indiana University-Purdue University Indianapolis, 723 West Michigan Street, 46202, Indianapolis, Indiana, USA aut NATIONALLICENCE 700 1- Chen L. College of Life Sciences, Hubei Normal University, 11 Cihu Road, 435002, Huangshi, Hubei, China aut NATIONALLICENCE 700 1- Ma L. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, 100093, Xiangshan, Beijing, China aut NATIONALLICENCE 700 1- Wang R. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, 100093, Xiangshan, Beijing, China aut NATIONALLICENCE 773 0- Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/1(2015-03-01), 128-135 0300-3604 53:1<128 2015 53 11099