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

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 gras... Full description

Journal Title: Planta 2006-10-01, Vol.224 (5), p.1080-1090
Main Author: Xu, Zhen Zhu
Other Authors: Zhou, Guang Sheng
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: Berlin: Springer-Verlag
ID: ISSN: 0032-0935
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recordid: cdi_proquest_miscellaneous_68878102
title: Combined effects of water stress and high temperature on photosynthesis, nitrogen metabolism and lipid peroxidation of a perennial grass Leymus chinensis
format: Article
creator:
  • Xu, Zhen Zhu
  • Zhou, Guang Sheng
subjects:
  • Amino Acids - metabolism
  • Biological and medical sciences
  • Carbon Dioxide - metabolism
  • Dehydration
  • Drought
  • Endopeptidases - metabolism
  • Fundamental and applied biological sciences. Psychology
  • Glutamate-Ammonia Ligase - metabolism
  • High temperature
  • Hot Temperature
  • Lipid Peroxidation - physiology
  • Lipids
  • Malondialdehyde - metabolism
  • Metabolism
  • Nitrate Reductase - metabolism
  • Nitrogen
  • Nitrogen - metabolism
  • Photosynthesis
  • Photosynthesis - physiology
  • Photosynthesis, respiration. Anabolism, catabolism
  • Plant physiology and development
  • Plant Proteins - metabolism
  • Plants
  • Poaceae - growth & development
  • Poaceae - metabolism
  • Poaceae - physiology
  • Soil
  • Soil temperature regimes
  • Soil water
  • Water - metabolism
  • Water - physiology
  • Water temperature
ispartof: Planta, 2006-10-01, Vol.224 (5), p.1080-1090
description: 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°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 (Fv/Fm), actual PSII efficiency (ΦPSII), 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 Fv/Fm 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.
language: eng
source:
identifier: ISSN: 0032-0935
fulltext: no_fulltext
issn:
  • 0032-0935
  • 1432-2048
url: Link


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titleCombined effects of water stress and high temperature on photosynthesis, nitrogen metabolism and lipid peroxidation of a perennial grass Leymus chinensis
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descriptionDrought 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°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 (Fv/Fm), actual PSII efficiency (ΦPSII), 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 Fv/Fm 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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subjectAmino Acids - metabolism ; Biological and medical sciences ; Carbon Dioxide - metabolism ; Dehydration ; Drought ; Endopeptidases - metabolism ; Fundamental and applied biological sciences. Psychology ; Glutamate-Ammonia Ligase - metabolism ; High temperature ; Hot Temperature ; Lipid Peroxidation - physiology ; Lipids ; Malondialdehyde - metabolism ; Metabolism ; Nitrate Reductase - metabolism ; Nitrogen ; Nitrogen - metabolism ; Photosynthesis ; Photosynthesis - physiology ; Photosynthesis, respiration. Anabolism, catabolism ; Plant physiology and development ; Plant Proteins - metabolism ; Plants ; Poaceae - growth & development ; Poaceae - metabolism ; Poaceae - physiology ; Soil ; Soil temperature regimes ; Soil water ; Water - metabolism ; Water - physiology ; Water temperature
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descriptionDrought 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°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 (Fv/Fm), actual PSII efficiency (ΦPSII), 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 Fv/Fm 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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abstractDrought 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°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 (Fv/Fm), actual PSII efficiency (ΦPSII), 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 Fv/Fm 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.
copBerlin
pubSpringer-Verlag
pmid16685524
doi10.1007/s00425-006-0281-5