Journal
PLANT AND CELL PHYSIOLOGY
Volume 46, Issue 10, Pages 1741-1746Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pci174
Keywords
Arabidopsis; calmodulin; darkness; leaf age; senescence
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Induction after prolonged darkness distinguishes the late-responsive genes din2 and din9 from the early-responsive gene din3 in Arabidopsis. The former genes were coincidently induced with the senescence marker gene YLS4 in rosette leaves of different ages and in the early-senescence mutant hys1. The calmodulin antagonists W-7, trifluoperazine, and fluphenazine accelerated the expression of the former genes in darkness but not in light, and had little effect on the latter gene. Our results suggest that Ca2+/ calmodulin signalling conveys a negative signal that suppresses the responses of late-responsive din genes to prolonged darkness. The results are discussed in relation to natural senescence.
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