Importance of hormonal profile on the onset of ripening in grape berries Vitis vinifera L.
Geny L., Deytieux C., Doneche B.
5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004. page 6
2004
บทคัดย่อ
Importance of hormonal profile on the onset of ripening in grape berries Vitis vinifera L.
Grape berry is classified as a non climacteric fruit which accumulates acid abscissic (
ABA) at the beginning of ripening.It seems that this phytohormone is an activating signal of ripening.We propose to have a global view over the hormonal aquilibrium.
As a part of this investigation, we have realized during the stage 81 of development (1% veraison).We have treated grape berry with ABA and the fungal toxin fusicoccin, with is known to have an ABA antagonist effect in plant tissues.
We first observe that both treatments induce a delay in the increase in berry weigh.The exogenous application of ABA levels is enhanced and acid indole acetic (AIA) levels is decreased in the berry.This treatment seems to advance ripening process.Application of fusicoccin to berry deletes the chlorophyll degradation.This is accompanied by a decrease of ABA levels compared to the control.
This results show that exogenous treatments with ABA modify the hormonal profile and the ripening process.The roles of ABA and AIA are discussed in relation with expression of some genes involved in the ripening process.