The effect of polyamines on leaf senescence in two diverse rose species

被引:0
作者
Shweta Sood
P.K. Nagar
机构
[1] Institute of Himalayan Bioresource Technology,
[2] Division of Biotechnology,undefined
来源
Plant Growth Regulation | 2003年 / 39卷
关键词
Polyamines; Putrescine; Senescence; Spermidine; Spermine;
D O I
暂无
中图分类号
学科分类号
摘要
Polyamines (PAs) retarded the senescence of leaf discs of two diverse speciesof rose viz., Rosabourboniana 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.
引用
收藏
页码:155 / 160
页数:5
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