Alternative respiratory pathway under drought is partially mediated by hydrogen peroxide and contributes to antioxidant protection in wheat [Triticum aestivum] leaves

• Published in: Plant production science Vol. 11; no. 1; pp. 59 - 66
• Main Authors: Feng, H.(Lanzhou Univ. (China)), Duan, J, Li, H, Liang, H, Li, X, Han, N
• Format: Journal Article
• Language: English
• Published: Tokyo Taylor & Francis 01.01.2008; Crop Science Society of Japan; Taylor & Francis Ltd; Taylor & Francis Group
• Subjects: Agronomy. Soil science and plant productions; Antioxidant defence system; Antioxidants; Benzene; Biological and medical sciences; BLE; COLECCIONES DE MATERIAL GENETICO; COLLECTION DE MATERIEL GENETIQUE; Cyanide-resistant respiration; Cyanides; DROUGHT; DROUGHT STRESS; ESTRES DE SEQUIA; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; GERMPLASM COLLECTIONS; Hydrogen peroxide; LOCI DE RASGOS CUANTITATIVOS; LOCUS DES CARACTERES QUANTITATIFS; QUANTITATIVE TRAIT LOCI; Reactive oxygen species; Respiration; ROOT SYSTEMS; SECHERESSE; Seedlings; SEQUIA; SISTEMA RADICULAR; STRESS DU A LA SECHERESSE; SYSTEME RACINAIRE; TRIGO; Water stress; Wheat; WHEATS; Plant production; Monocotyledones; Reactive oxygen species; Hydrogen peroxide; Antioxidant defence system; Plant leaf; Antioxidant; Water stress; Cereal crop; Gramineae; Cyanide-resistant respiration; Angiospermae; Spermatophyta; Cyanide resistant respiration; Drought; Wheat; Triticum aestivum
• ISSN: 1343-943X; 1349-1008
• DOI: 10.1626/pps.11.59

Water stress significantly enhanced the capacity of alternative respiratory pathway and induced AOX1 transcript in wheat (Triticum aestivum L.) leaves. The water-stressed seedlings pretreated with 1 mM salicylhydroxamic acid (SHAM) had higher level of production of reactive oxygen species (ROS) than the seedlings either subjected to drought or SHAM treatment alone did. This observation suggests that cyanide-resistant respiration could play a role in antioxidant protection under the condition of drought. Exogenous application of hydrogen peroxide effectively increased the capacity of alternative respiratory pathway and induced AOX1 transcription. Pretreatment with ROS scavengers, such as 4,5-dihydroxy-1,3-benzene disulfonic acid (Tiron) and dimethylthiourea (DMTU), arrested the increase of ROS and partly inhibited the induction of both cyanide-resistant respiration and AOX1 transcript under water stress. These results suggest that the enhancement of cyanide-resistant respiration under drought might be partially mediated by hydrogen peroxide.