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Changes in poly amine titer in etiolated pea pisum sativum cultivar alaska seedlings following red light treatment



Changes in poly amine titer in etiolated pea pisum sativum cultivar alaska seedlings following red light treatment



Plant & Cell Physiology 23(1): 19-26



The polyamines agmatine, cadaverine, putrescine, spermidine and spermine were measured by TLC and high performance liquid chromatography in buds and in 5 mm long subapical sections of the 3rd internode of 6-day-old etiolated pea seedlings. The polyamine pattern of each organ was specific, relative quantities varying with age and growth. While agmatine, putrescine, spermidine and spermine were present in buds and in tissues of the 3rd internode, cadaverine occurred in the 3rd internode only. Concentrations of spermidine and spermine were higher in the bud than in the 3rd internode, and the highest putrescine titer occurred in the internode. Short exposure of etiolated seedlings to red light (5 min) increased bud development while inhibiting growth of the 3rd internode. In general, exposure to red light increased the titer of putrescine, agamtine and spermidine in the bud, whereas in the internode a reverse pattern occurred, i.e., internodes of seedlings growing in the dark yielded higher titer of polyamines in general, and agmatine in particular. This is particularly pronounced 18 h after exposure to red light. A link between phytochrome-controlled growth and polyamine titer is suggested.

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