Comparative effects of water potential stress induced by salt, alkali and drought on photosynthetic electron transport and apparatus in Hordeum jubatum seedlings
Congcong Shi A # , Yanrong Fu B # , Yuqian Guo A , Yuwen Ma A , Shuxin Li C , Jixiang Lin
A and Jinghong Wang A *
+ Author Affiliations
- Author Affiliations
A Key Laboratory of Saline-alkali Vegetation Ecology Restoration, Ministry of Education, College of Landscape Architecture, Northeast Forestry University, No. 26 Hexing Road, Xiangfang District, Harbin, Heilongjiang Province 150040, China.
B Chinese Society of Landscape Architecture, Beijing 100835, China.
C Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
* Correspondence to: yuanlin@nefu.edu.cn
# These authors contributed equally to this paper
Handling Editor: Enrico Francia
Crop & Pasture Science 74(4) 324-333 https://doi.org/10.1071/CP22202
Submitted: 10 June 2022 Accepted: 19 September 2022 Published: 14 October 2022
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Photosynthetic electron transport and apparatus are highly susceptible to abiotic stressors during photosynthesis. Hordeum jubatum L. is an ornamental grass with excellent salt tolerance, used for soil improvement and ecological restoration in Northeast China. However, the comparative effects of salt, alkali and drought conditions on the photosynthetic apparatus of H. jubatum under uniform water potential are little known.
Aims: We explored the photosynthetic response of H. jubatum to uniform levels of water potential stress induced by three different stressors: salt, alkali and drought.
Methods: Seedlings of H. jubatum were irrigated with three concentrations of NaCl, NaHCO3 and PEG-6000 to induce water potentials of −0.21, −0.47 and −0.82 MPa. Transient fluorescence of chlorophyll a in the seedlings was measured, and JIP-test parameters were obtained.
Key results: Lower values of J–I phase fluorescence intensity and appearance of a K-band under stress treatments indicated restricted electron transfer from the oxygen-evolving complex in the donor of photosystem II. In addition, the values of ΔI-band and parameters MO and N increased, whereas those of Sm, ϕEo and ψO decreased, indicating interruption of electron flow between electron acceptors pheophytin and NADP+. Serious adverse effects of alkali stress on the acceptors were observed; the low water potential induced by NaHCO3 damaged the thylakoid membrane on the chloroplast, resulting in increased degradation of D1 protein.
Conclusions: The results suggest that H. jubatum seedlings have greater tolerance to salt and drought stress, but are highly sensitive to alkali stress in the photosynthetic system.
Implications: This study provides physiological information for the successful cultivation of H. jubatum under adverse environment conditions.
Keywords: alkali, chlorophyll a fluorescence, drought, Hordeum jubatum, photosynthesis, photosystem II, salt, water potential.
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