Cited by 314Plant Stress Responses and TolerancePhotosynthetic Processes and MechanismsPlant Water Relations and Carbon Dynamics

Combined effects of water stress and high temperature on photosynthesis, nitrogen metabolism and lipid peroxidation of a perennial grass Leymus chinensis

Xu, Zhen Zhu, Zhou, Guang Sheng·2006·Planta

Abstract

Drought and high-temperature stresses have been extensively studied; however, little is known about their combined impact on plants. In the present study, we determined the photosynthetic gas exchange, chlorophyll fluorescence, nitrogen level, and lipid peroxidation of the leaves of a perennial grass (Leymus chinensis (Trin.) Tzvel.) subjected to three constant temperatures (23, 29 and 32 degrees C), and five soil-moisture levels (75-80%, 60-65%, 50-55%, 35-40% and 25-30% of field capacity, respectively). High temperature significantly decreased plant biomass, leaf green area, leaf water potential, photosynthetic rate (A), maximal efficiency of PSII photochemistry (F (v)/F (m)), actual PSII efficiency (Phi(PSII)), the activities of nitrate reductase (NR; EC 1.6.6.1) and glutamine synthetase (GS; EC 6.3.1.2), but markedly increased the ratio of leaf area to leaf weight (SLA), endopeptidase (EP; EC 3.4.24.11) activity, and malondialdehyde (MDA) content, especially under severe water stress conditions. The A and F (v)/F (m) were significantly and positively correlated with leaf-soluble protein content, and the activities of NR and GS. However, both photosynthesis parameters were significantly and negatively correlated with EP activity and MDA content (P < 0.05). It is suggested that high temperature, combined with severe soil drought, might reduce the function of PSII, weaken nitrogen anabolism, strengthen protein catabolism, and provoke lipid peroxidation. The results also indicate that severe water stress might exacerbate the adverse effects of high temperature, and their combination might reduce the plant productivity and distribution range of L. chinensis in the future.

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Crossref · 10.1007/s00425-006-0281-5

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Authors
Xu, Z. Z., & Zhou, G. S.
Affiliations
Chinese Academy of Sciences (CN)
Corresponding author
Zhou, Guang Sheng
Venue
Planta
Published
2006-05-10
Volume
224
Issue
5
Pages
1080-1090
ISSN
  • 0032-0935 (ISSN-L)
  • 1432-2048
OpenAlex
W1975375069
Cited by
314
References
51
Citations by year
2026: 11 · 2025: 6 · 2024: 10 · 2023: 22 · 2022: 32 · 2021: 24 · 2020: 19 · 2019: 13 · 2018: 18 · 2017: 20 · 2016: 26 · 2015: 19 · 2014: 16 · 2013: 17 · 2012: 12
FWCI
9.82
Type
journal article
Language
en
Open access
closed
Locations
  • Planta (publishedVersion)
  • PubMed (publishedVersion)
  • Institute of Botany, CAS Institutional Repository (submittedVersion)
Funders
  • National Natural Science Foundation of China
  • Chinese Academy of Sciences
  • Institute of Botany, Chinese Academy of Sciences
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Stress Responses and Tolerance
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Physical Sciences › Environmental Science › Global and Planetary Change › Plant Water Relations and Carbon Dynamics
Keywords
Leymus chinensis, drought stress, high temperature, combined abiotic stress, photosynthesis, nitrogen metabolism, lipid peroxidation, chlorophyll fluorescence, nitrate reductase, glutamine synthetase, endopeptidase, malondialdehyde, leaf water potential, protein degradation, soil moisture, perennial grasses
MeSH terms
Amino Acids, Carbon Dioxide, Glutamate-Ammonia Ligase, Poaceae, Hot Temperature, Malondialdehyde, Nitrogen, Endopeptidases, Photosynthesis, Plant Proteins, Soil, Water, Lipid Peroxidation, Nitrate Reductase

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