Physiological response to salinity stress and tolerance mechanics of Populus euphratica

Zhao, Chun Yan and Si, Jian Hua and Feng, Qi and Deo, Ravinesh C. and Yu, Teng Fei and Li, Pei Du (2017) Physiological response to salinity stress and tolerance mechanics of Populus euphratica. Environmental Monitoring and Assessment, 189 (11). pp. 533-543. ISSN 0167-6369

Abstract

The salinity stress inhibits the growth of Populus euphratica (P. euphratica), and the extent of inhibition tends to increase with a rise of salt concentration while the net photosynthesis rate, stomatal conductance, transpiration rate, and internal CO2 concentration are seen to decline with increasing salt concentration. Compared with the control group, the percentage decline is found to be about 48.50, 15.72, 42.09, and 48.33%, respectively. Although all chlorophyll fluorescence of P. euphratica exhibits a typical O-J-I-P curve in differently concentrated salt solutions, salinity stress shows a significant influence on the value of J and I step (P < 0.05). However, salinity stress was seen to induce a decrease in variable fluorescence (Fv)/maximal
fluorescence value by 2.32, 8.78, 12.80, 12.93, 16.46,
and 19.63% treated by 50-, 100-, 150-, 200-, 250-, and
300-mM salt solution compared with the control group,
respectively. Salinity stress appeared also to induce a
decrease in Fv/minimal fluorescence values by a magnitude
of 5.22, 16.02, 18.06, 22.95, 26.34, and 32.19% in P. euphratica treated by 50-, 100-, 150-, 200-, 250-, and 300-mM salt solution relative to the control group, respectively. An increase in the content of malondialdehyde amounted to 4.12, 25.59, 34.60, 68.11, 70.72, and 67.68% in P. euphratica treated by 50-, 100-, 150-, 200-, 250-, and 300-mM salt solution compared to the control group, respectively. In terms of the content of proline, the salinity stress induced an increase by 4.94, 29.49, 53.20, 77.65, 82.46, and 90.68% in P. euphratica treated by 50-, 100-, 150-, 200-, 250-, and 300-mM salt solution, respectively.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: This research was supported by 2016 Chinese Academy of Science President's Fellowship to Dr Ravinesh C Deo. Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 16 Oct 2017 23:46
Last Modified: 16 Oct 2017 23:46
Uncontrolled Keywords: salinity stress; photosynthetic; chlorophyll fluorescence; malondialdehyde; proline
Fields of Research : 05 Environmental Sciences > 0501 Ecological Applications > 050102 Ecosystem Function
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970105 Expanding Knowledge in the Environmental Sciences
Identification Number or DOI: 10.1007/s10661-017-6257-z
URI: http://eprints.usq.edu.au/id/eprint/33214

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