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NaCl-induced senescence in leaves of rice (Oryza sativa L) cultivars differing in salinity resistance
- Source :
- Annals of Botany, Vol. 78, no. 3, p. 389-398 (1996)
- Publication Year :
- 1996
-
Abstract
- The influence of NaCl on senescence-related parameters (protein and chlorophyll concentrations, membrane permeability and chlorophyll fluorescence) was investigated in young and old leaves of five rice cultivars differing in salt resistance. NaCl hastened the naturally-occurring senescence of rice leaves which normally appears during leaf ontogeny: it decreased chlorophyll and protein concentrations and increased membrane permeability and malondialdehyde synthesis. Such an acceleration of deteriorative processes affected all leaves in sail-sensitive cultivars while it was more marked in oldest than in youngest leaves of sail-resistant genotypes. NaCl-induced senescence also involved specific modifications, such as an increase in basal non-variable chlorophyll fluorescence (F-0) recorded in all cultivars or a transient increase in soluble protein concentration recorded in salt-resistant genotypes only. Alteration of membrane permeability appeared as one of the first symptoms of senescence in rice leaves and allowed discrimination among cultivars after only 7 d of stress. In contrast, F-v/F-m ratio (variable fluorescence/maximal fluorescence) was the same for all cultivars during the first 18 d of stress and thus could not be used for identifying salt-resistant rice exposed to normal light conditions. Relationships between parameters involved in leaf senescence are discussed in relation to salinity resistance of rice cultivars. (C) 1996 Annals of Botany Company.
Details
- Database :
- OAIster
- Journal :
- Annals of Botany, Vol. 78, no. 3, p. 389-398 (1996)
- Notes :
- English
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1130561579
- Document Type :
- Electronic Resource