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Arabidopsis onset of leaf death mutants identify a regulatory pathway controlling leaf senescence.
- Source :
-
The Plant journal : for cell and molecular biology [Plant J] 2002 Oct; Vol. 32 (1), pp. 51-63. - Publication Year :
- 2002
-
Abstract
- The onset of leaf senescence is controlled by leaf age and ethylene can promote leaf senescence within a specific age window. We exploited the interaction between leaf age and ethylene and isolated mutants with altered leaf senescence that are named as onset of leaf death (old) mutants. Early leaf senescence mutants representing three genetic loci were selected and their senescence syndromes were characterised using phenotypical, physiological and molecular markers. old1 is represented by three recessive alleles and displayed earlier senescence both in air and upon ethylene exposure. The etiolated old1 seedlings exhibited a hypersensitive triple response. old2 is a dominant trait and the mutant plants were indistinguishable from the wild-type when grown in air but showed an earlier senescence syndrome upon ethylene treatment. old3 is a semi-dominant trait and its earlier onset of senescence is independent of ethylene treatment. Analyses of the chlorophyll degradation, ion leakage and SAG expression showed that leaf senescence was advanced in ethylene-treated old2 plants and in both air-grown and ethylene-treated old1 and old3 plants. Epistatic analysis indicated that OLD1 might act downstream of OLD2 and upstream of OLD3 and mediate the interaction between leaf age and ethylene. A genetic model was proposed that links the three OLD genes and ethylene into a regulatory pathway controlling the onset of leaf senescence.
- Subjects :
- Apoptosis physiology
Arabidopsis drug effects
Arabidopsis growth & development
Cell Membrane Permeability physiology
Chlorophyll metabolism
Ethylenes pharmacology
Gene Expression Regulation, Developmental
Gene Expression Regulation, Plant
Genetic Complementation Test
Models, Genetic
Mutation
Pigments, Biological physiology
Plant Leaves drug effects
Plant Leaves growth & development
Time Factors
Apoptosis genetics
Arabidopsis genetics
Plant Leaves genetics
Subjects
Details
- Language :
- English
- ISSN :
- 0960-7412
- Volume :
- 32
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- The Plant journal : for cell and molecular biology
- Publication Type :
- Academic Journal
- Accession number :
- 12366800
- Full Text :
- https://doi.org/10.1046/j.1365-313x.2002.01400.x