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Plant Physiol, November 2000, Vol. 124, pp. 1305-1314
Cloning and Characterization of a Receptor-Like Protein Kinase
Gene Associated with Senescence
Taleb
Hajouj,
Regina
Michelis, and
Shimon
Gepstein*
Department of Biology, Technion-Israel Institute of
Technology, Haifa 32000, Israel
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 chlorophyll
a/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.
*
Corresponding author; e-mail gepstein{at}tx.technion.ac.il;
fax 972-4-8225153.
© 2000 American Society of Plant Physiologists
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