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Cyto kinins in citrus sinensis cultivar valencia 1. fluctuations in the leaves during seasonal and developmental changes



Cyto kinins in citrus sinensis cultivar valencia 1. fluctuations in the leaves during seasonal and developmental changes



Scientia Horticulturae 16(1): 9-16



Leaves of C. sinensis (L.) Osbeck, 'Valencia', were analyzed for cytokinin activity on a seasonal and developmental basis. In spring, high levels of polar and low levels of non-polar cytokinins were detected in the mature leaves. This situation was reversed in early summer, when the polar cytokinins in these leaves became almost undetectable and the non-polar cytokinins, which co-chromatographed with zeatin and ribosylzeatin, increased. This apparent interconversion was followed by a decrease in the overall cytokinin content of the mature leaves, so that low levels were detected from mid-summer until late autumn. In developing leaves, particularly those expanding rapidly, low levels of cytokinin activity that co-chromatographed with zeatin and ribosylzeatin were detected. Once leaves were fully expanded, the activity associated with these cytokinins, as well as the polar derivatives, increased markedly. Cytokinins are probably utilized during periods of active shoot growth, particularly when rapid leaf expansion is taking place. In this respect, the mature leaves may play an important role in evergreen citrus. Cytokinin remobilization and utilization or export to the new shoot may occur from mature leaves following quiescent periods.

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