Abstract
Polyamines (PAs) retarded the senescence of leaf discs of two diverse speciesof rose viz., Rosa bourboniana andRosa damascena, while polyamine biosynthetic inhibitorsdifluoromethylornithine (DFMO), difluoromethylarginine (DFMA), methylglyoxal-bis(guanylhydrazone) (MGBG) and abscisic acid (ABA) promoted senescence. Sperminewas significantly the most effective polyamine in retarding senescence inR. bourboniana while MGBG and DFMA were more prominent inaccelerating senescence in R. damascena and R.bourboniana respectively. Protein and RNA content were significantlyhigher in polyamine treated leaf discs compared to those treated with polyaminebiosynthetic inhibitors and ABA. Total and reducing sugars decreased under alltreatments while the starch content increased significantly only in polyaminetreated leaf discs. Peroxidase and cellulase activities were retarded bypolyamine treatments and accelerated by polyamine biosynthetic inhibitors andABA. The role of PAs is discussed in relation to senescence.
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Sood, S., Nagar, P. The effect of polyamines on leaf senescence in two diverse rose species. Plant Growth Regulation 39, 155–160 (2003). https://doi.org/10.1023/A:1022514712295
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DOI: https://doi.org/10.1023/A:1022514712295