Abstract
Abstract Senescence-associated genes are up-regulated during plant senescence and many have been implicated in encoding enzymes involved in the metabolism of senescing tissues. Using the differential display technique, we identified a SAG in bean (Phaseolus vulgaris) leaf that was exclusively expressed during senescence and was designated senescence-associated receptor-like kinase (SARK). The deduced SARK polypeptide consists of a signal peptide, a leucine-rich repeat in the extracellular region, a single membrane-spanning domain, and the characteristic serine/threonine protein kinase domain. The mRNA level for SARK increased prior to the loss of chlorophyll and the decrease of chlorophylla/b-binding protein mRNA. Detached mature bean leaves, which senesce at an accelerated rate compared with leaves on intact plants, showed a similar temporal pattern of SARK message accumulation. Light and cytokinin, which delayed the initiation of leaf senescence, also delayed SARK gene expression; in contrast, darkness and ethylene, which accelerated senescence, advanced the initial appearance of the SARK transcript. SARK protein accumulation exhibited a temporal pattern similar to that of its mRNA. A possible role for SARK in the regulation of leaf senescence was considered.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 27, 2002, 1:01 a.m.) |
Deposited | 4 years, 2 months ago (June 25, 2021, 7:20 a.m.) |
Indexed | 4 weeks ago (Aug. 7, 2025, 4:52 a.m.) |
Issued | 24 years, 10 months ago (Nov. 1, 2000) |
Published | 24 years, 10 months ago (Nov. 1, 2000) |
Published Online | 24 years, 10 months ago (Nov. 1, 2000) |
Published Print | 24 years, 10 months ago (Nov. 1, 2000) |
@article{Hajouj_2000, title={Cloning and Characterization of a Receptor-Like Protein Kinase Gene Associated with Senescence}, volume={124}, ISSN={0032-0889}, url={http://dx.doi.org/10.1104/pp.124.3.1305}, DOI={10.1104/pp.124.3.1305}, number={3}, journal={Plant Physiology}, publisher={Oxford University Press (OUP)}, author={Hajouj, Taleb and Michelis, Regina and Gepstein, Shimon}, year={2000}, month=nov, pages={1305–1314} }