EFFECT OF DISBUDDING ON ROOTING OF DORMANT GRAPEVINE CUTTINGS

The buds and leaves play an important role in rooting of cuttings physiologically.
In dormant woody cuttings of grapevine, disbudding inhibits rooting and decreases auxin levels in their basal parts in which root formation occurs.
It is suggested that the rooting of cuttings is controlled by auxin produced from buds.
In this experiment, the effect of disbudding on the rooting of dormant cuttings was investigated using easy-to-root grapevine cultivar Takasumi.
The disbudding did not adversely influence rooting of dormant cuttings.
However, disbudding inhibited rooting after breaking dormancy.
The rooting percentage in control and disbudded cuttings was high early in the dormant stage, and less to nil later in the dormant stage.
The fluctuation pattern of diffusible auxin (IAA) after cutting was the same between control and disbudded cuttings.
The disbudding didn’t decrease auxin levels in the basal part of the cuttings either.
These results indicate that the role of buds in rooting of dormant cuttings is different from that previously reported for dormant woody cuttings.

XXVI International Horticultural Congress: Viticulture – Living with Limitations

Y. Kawai, M. Ryuzoji, S. Hiratsuka

Vitis vinifera x V. labrusca, diffusible IAA, extractable IAA, dormant bud, easy-to-root cultivar, sprouting

https://doi.org/10.17660/ActaHortic.2004.640.31