A comparison of leaf and petal senescence in wallflower reveals common and distinct patterns of gene expression and physiology
Price, Anna Marie, Orellana, Danilo F. Aros, Salleh, Faezah Mohd, Stevens, Ryan, Acock, Rosemary, Buchanan-Wollaston, Vicky, Stead, A. D. and Rogers, Hilary J.. (2008) A comparison of leaf and petal senescence in wallflower reveals common and distinct patterns of gene expression and physiology. Plant Physiology, Volume 147 (Number 4). pp. 1898-1912. ISSN 0032-0889Full text not available from this repository.
Official URL: http://dx.doi.org/10.1104/pp.108.120402
Petals and leaves share common evolutionary origins but perform very different functions. However, few studies have compared leaf and petal senescence within the same species. Wallflower ( Erysimum linifolium), an ornamental species closely related to Arabidopsis ( Arabidopsis thaliana), provide a good species in which to study these processes. Physiological parameters were used to define stages of development and senescence in leaves and petals and to align these stages in the two organs. Treatment with silver thiosulfate confirmed that petal senescence in wallflower is ethylene dependent, and treatment with exogenous cytokinin and 6-methyl purine, an inhibitor of cytokinin oxidase, suggests a role for cytokinins in this process. Subtractive libraries were created, enriched for wallflower genes whose expression is up-regulated during leaf or petal senescence, and used to create a microarray, together with 91 senescence-related Arabidopsis probes. Several microarray hybridization classes were observed demonstrating similarities and differences in gene expression profiles of these two organs. Putative functions were ascribed to 170 sequenced DNA fragments from the libraries. Notable similarities between leaf and petal senescence include a large proportion of remobilization-related genes, such as the cysteine protease gene SENESCENCE-ASSOCIATED GENE12 that was up-regulated in both tissues with age. Interesting differences included the up-regulation of chitinase and glutathione S-transferase genes in senescing petals while their expression remained constant or fell with age in leaves. Semiquantitative reverse transcription-polymerase chain reaction of selected genes from the suppression subtractive hybridization libraries revealed more complex patterns of expression compared with the array data.
|Item Type:||Journal Article|
|Subjects:||Q Science > QH Natural history > QH426 Genetics
Q Science > QK Botany
S Agriculture > SB Plant culture
|Divisions:||Faculty of Science > Life Sciences (2010- )|
|Library of Congress Subject Headings (LCSH):||Cheiranthus cheiri -- Aging, Plant gene expression, Cheiranthus cheiri -- Physiology -- Research|
|Journal or Publication Title:||Plant Physiology|
|Publisher:||American Society of Plant Biologists|
|Official Date:||August 2008|
|Number of Pages:||15|
|Page Range:||pp. 1898-1912|
|Access rights to Published version:||Restricted or Subscription Access|
Bieleski RL (1995) Onset of phloem export from senescent petals of daylily.
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