Biologia plantarum 55:721, 2011 | DOI: 10.1007/s10535-011-0175-7

Heat tolerance in rice mutants is associated with reduced accumulation of reactive oxygen species

M. Panigrahy1, S. Neelamraju1, D. Nageswara Rao1, R. Ramanan2,*
1 Directorate of Rice Research, Rajendra Nagar, India
2 Centre for Cellular and Molecular Biology, Hyderabad, India

Four mutants induced by ethylmethane sulphonate (N22-H-dgl56, N22-H-dgl101, N22-H-dgl162 and N22-H-dgl219) with conspicuous dark green leaves were identified in the drought and heat-tolerant rice cultivar Nagina22 (N22), when screened under prolonged drought and heat conditions in field. During dark-induced senescence, these mutants maintained higher chlorophyll and carotenoid contents, and photochemical efficiency of photosystem 2 in comparison with N22. Following heat treatment, these mutants accumulated less reactive oxygen species (assayed by histochemical staining for H2O2 and superoxide radicals) and maintained higher chlorophyll content than N22.

Keywords: chlorophyll; H2O2; Oryza sativa; photochemical efficiency; superoxide radicals

Received: January 6, 2010; Accepted: June 29, 2010; Published: December 1, 2011Show citation

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Panigrahy, M., Neelamraju, S., Rao, D., & Ramanan, R. (2011). Heat tolerance in rice mutants is associated with reduced accumulation of reactive oxygen species. Biologia plantarum, 55(4), 721. doi: 10.1007/s10535-011-0175-7.
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