期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 157, 期 5, 页码 473-480出版社
ELSEVIER GMBH
DOI: 10.1016/S0176-1617(00)80101-7
关键词
chloroplast; Dunaliella salina; growth; polyamine; putrescine; transglutaminase
The variant strain of Dunaliella salina is characterised by: a) a very low growth capacity; b) a deficiency in polyamines, transglutaminase chlorophyll, and protein content; and c) an unbalanced putrescine/spermidine ratio. A supply of 100 mu mol/L putrescine or 1 mmol/L ornithine induces the resumption of growth. Putrescine has several additional effects: endogenous putrescine and spermidine levels increase and their ratio reaches 1.6, a value typical of the growing wild type; chlorophyll a and b also increase and their ratio (3.6) becomes close to that of the wild type (3.0); protein content increases, especially in the chloroplast. Transglutaminase(s) in chloroplasts of putrescine-treated algae is stimulated and increases its conjugating activity by 9-fold in the light and less than 3-fold in the dark when compared to untreated controls. The role of polyamines in improving the physiological condition of the chloroplast and their effect on growth are discussed.
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