New Zealand Journal of Botany abstracts

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REGULATORS OF CELL DIVISION IN PLANT TISSUES
1. INHIBITORS AND STIMULANTS OF CELL DIVISION IN DEVELOPING FRUITS: THEIR PROPERTIES AND ACTIVITY IN RELATION TO THE CELL DIVISION PERIOD

D. S. Letham

Fruit Research Division, Department of Scientific and Industrial Research, Auckland.

Abstract Kinins have been detected in extracts of fruitlets of a number of species. Plum fruitlet extracts also contained growth inhibitors which were separated from the kinins. These inhibitors and kinins did not appear to be artefacts of the extraction procedure. The kinin activity of plum extracts was due to two or more factors which interacted synergistically with auxins to promote cell division. Kinin activity of apple fruitlet extracts was greatest during the period of intense cell division characteristic of the development of the apple fruit and declined just before the cessation of this period. With plum fruitlets, the highest activity occurred at the onset of active cell division. Kinins may therefore play some role in the regulation of cell division in both these fruitlets. Extracts from plum fruitlets showed greatest inhibitory activity during the cell division period, the activity declining at the time of cessation of division. These inhibitors are therefore unlikely to be solely responsible for the observed cessation of division.

N.Z. J. Bot. 1 : 336-50
(Received for publication. 24 July 1963)

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