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Science 5 January 2007:
Vol. 315. no. 5808, p. 73
DOI: 10.1126/science.1132912
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Brevia
Cross-Species Identification of Mendel's I Locus
Ian Armstead,1*
Iain Donnison,1
Sylvain Aubry,2
John Harper,1
Stefan Hörtensteiner,2
Caron James,1
Jan Mani,2
Matt Moffet,3
Helen Ougham,1
Luned Roberts,1
Ann Thomas,1
Norman Weeden,3
Howard Thomas,1
Ian King1
A key gene involved in plant senescence, mutations of which partially disable chlorophyll catabolism and confer stay-green leaf and cotyledon phenotypes, has been identified in Pisum sativum, Arabidopsis thaliana, and Festuca pratensis by using classical and molecular genetics and comparative genomics. A stay-green locus in F. pratensis is syntenically equivalent to a similar stay-green locus on rice chromosome 9. Functional testing in Arabidopsis of a homolog of the rice candidate gene revealed (i) senescence-associated gene expression and (ii) a stay-green phenotype after RNA interference silencing. Genetic mapping in pea demonstrated cosegregation with the yellow/green cotyledon polymorphism (I/i) first reported by Gregor Mendel in 1866.
1 Institute of Grassland and Environmental Research, Aberystwyth SY23 3EB, UK.
2 Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland.
3 Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA.
* To whom correspondence should be addressed. E-mail: ian.armstead{at}bbsrc.ac.uk
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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- Mendel's green cotyledon gene encodes a positive regulator of the chlorophyll-degrading pathway.
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- Identification of a Novel Chloroplast Protein AtNYE1 Regulating Chlorophyll Degradation during Leaf Senescence in Arabidopsis.
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- The Senescence-Induced Staygreen Protein Regulates Chlorophyll Degradation.
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