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A comparison of the expression patterns of several senescence-associated genes in response to stress and hormone treatment
Authors:Weaver  Louis M  Gan  Susheng  Quirino  Betania  Amasino  Richard M
Institution:(1) Dept. of Biochemistry, University of Wisconsin at Madison, 420 Henry Mall, Madison, s[WI, 53706, USA;(2) Present address: Tobacco and Health Research Institute and Dept. of Agronomy, University of Kentucky, Lexington, KY 40546, USA
Abstract:The expression of several Arabidopsis thaliana senescence-associated genes (SAGs) in attached and/or detached leaves was compared in response to age, dehydration, darkness, abscisic acid, cytokinin, and ethylene treatments. Most of the SAGs responded to most of the treatments in a similar fashion. Detachment in darkness and ethylene were the strongest inducers of both SAGs and visible yellowing. Detachment in light was also a strong inducer of SAGs, but not of visible yellowing. The other treatments varied more in their effects on individual SAGs. Responses were examined in both older and younger leaves, and generally were much stronger in the older ones. Individual SAGs differed from the norms in different ways, however, suggesting that their gene products play a role in overlapping but not identical circumstances. Some SAGs responded quickly to treatments, which may indicate a direct response. Others responded more slowly, which may indicate an indirect response via treatment-induced senescence. Four new SAGs were isolated as part of this work, one of which shows strong similarity to late embryogenesis-abundant (Lea) genes.
Keywords:gene expression  phytohormone  Lea  leaf senescence  senescence-associated gene  stress
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