Seasonal Changes in Abscission Responses to Auxin in Debladed Petioles

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Abstract
The abscission of debladed petioles of various ages in Ervatamia and Coleus has been followed throughout the year. In general, the retention times for the two species were found to be maximal in the summer and minimal in the winter months. In both species older petioles tended to abscise earlier. The occurrences of an auxin-inhibitable stage-I and an auxin-promotable stage-II were clearly established. The sensitivity to auxin in both stages declined with increase in age, particularly in the two-node and three-node twigs of Ervatamia and in the four-node twigs of Coleus. The durations of stage-I and stage-II were found to be characteristically different in different seasons. In general, stage-I lasted longer both in younger petioles and during the summer months. Auxin sensitivity in both stages was greater in summer than in winter. Intermediate results were obtained in the other two seasons. In both the species the auxin-promotable stage-II weakened with time, as shown by a smaller promotion with delayed auxin application.

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