Chilling Tolerance of Wheat Seedlings Is Related to an Enhanced Alternative Respiratory Pathway

Pretreatment with exogenous hydrogen peroxide (H2O2) mitigated the water loss of wheat leaves exposed to 4°C for 24 h. The same treatment also partially reduced the increases of electrolyte leakage and H2O2 production of the chilled plants. These observations suggest that H2O2 pretreatment could eff...

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Published inCrop science Vol. 48; no. 6; pp. 2381 - 2388
Main Authors Feng, Hanqing, Li, Xin, Duan, Jiangong, Li, Hongyu, Liang, Houguo
Format Journal Article
LanguageEnglish
Published Madison Crop Science Society of America 01.11.2008
American Society of Agronomy
Subjects
Abscisic acid
Adaptation to environment and cultivation conditions
Agronomy. Soil science and plant productions
alternative oxidase
alternative respiratory pathway
Biological and medical sciences
cell respiration
cold stress
cold tolerance
Defense mechanisms
Electrolyte leakage
electrolytes
enzyme activity
Enzymes
Fundamental and applied biological sciences. Psychology
gene expression
Genetics and breeding of economic plants
Hydrogen peroxide
hydroxamic acids
Plant resistance
Proteins
Seedlings
Stress
Studies
Triticum aestivum
Varietal selection. Specialized plant breeding, plant breeding aims
Water loss
Wheat
Monocotyledones
Triticum
Gramineae
Cold resistance
Plant juvenile growth stage
Angiospermae
Tolerance
Spermatophyta
Cyanide resistant respiration
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Summary:Pretreatment with exogenous hydrogen peroxide (H2O2) mitigated the water loss of wheat leaves exposed to 4°C for 24 h. The same treatment also partially reduced the increases of electrolyte leakage and H2O2 production of the chilled plants. These observations suggest that H2O2 pretreatment could effectively induce chilling tolerance. The capacity of the alternative respiratory pathway and the expression of the gene encoding the alternative oxidase (AOX1) were substantially elevated by H2O2 treatment under either normal or chilling conditions. Salicylhydroxamic acid (SHAM, an inhibitor of the alternative respiratory pathway) decreased the tolerance of plants to chilling conditions and reversed the chilling tolerance induced by exogenous application of H2O2. These observations indicate that the tolerance of plants to chilling might be related to an enhanced alternative respiratory pathway.
Bibliography:http://dx.doi.org/10.2135/cropsci2007.04.0232
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ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0011-183X
1435-0653
DOI:10.2135/cropsci2007.04.0232