EFFECTS OF GIBBERELLIN AND DAMINOZIDE ON THE DISTRIBUTION OF ¹⁴C-ASSIMILATES IN GRAPE SHOOTS

Using Delaware grapevine (Vitis Labrusca L.), studies were made on the effects of hormone application on the incorporation of ¹⁴C-assimilates into the inflorescence 24 h after ¹⁴CO₂ application to various leaves.
Treatments involved either dipping the inflorescence into gibberellin (GA) or spraying the whole shoot with daminozide (B9), two weeks before full bloom.

In nontreated shoots, the distribution of assimilates to a particular inflorescence was greatest from leaves just below and above the inflorescence and always on the same side of the shoot as the inflorescence.
Application of GA or B9 had little effect on the phyllotactic influence.
However, the percentage distribution of ¹⁴C-assimilates into the inflorescence was increased by GA and B9 application, and the percentage export from individual leaves was increased by GA but decreased by B9, especially in leaves close to the inflorescence.

V International Symposium on Growth Regulators in Fruit Production

Y. Motomura

https://doi.org/10.17660/ActaHortic.1986.179.64