Polyamines and senescence of maintenance foliage of tea,Camellia sinensis L.
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In leaf discs of maintenance foliage of tea (Camellia sinensis) polyamines (PAs) and kinetin retarded chlorophyll (Chl) loss, whereas inhibitors of PA biosynthesis [difluoromethyl arginine, difluoromethyl ornithine, methylglyoxal-bis(guanylhydrazone)] and abscisic acid (ABA) promoted senescence. The contents of RNA and protein were significantly higher in PA and kinetin treated leaf discs as compared to those treated with inhibitors and ABA. The contents of total and reducing saccharides declined with the progressive loss of Chl, and the concentration of starch increased in all the PA treated leaf discs. Free amino acid content also increased under all the treatments, but the increase was comparatively larger in case of inhibitors application.
Additional key wordsabscisic acid chlorophyll kinetin putrescine RNA spermidine spermine
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