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ABA during reproductive development in non‐irrigated grapevines ( Vitis vinifera L. cv. Tempranillo)
Author(s) -
ANTOLÍN M. CARMEN,
BAIGORRI HELENA,
LUIS IÑAKI DE,
AGUIRREZÁBAL FAUSTINO,
GENY LAURENCE,
BROQUEDIS MICHEL,
SÁNCHEZDÍAZ MANUEL
Publication year - 2003
Publication title -
australian journal of grape and wine research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.65
H-Index - 77
eISSN - 1755-0238
pISSN - 1322-7130
DOI - 10.1111/j.1755-0238.2003.tb00266.x
Subject(s) - veraison , xylem , stomatal conductance , abscisic acid , biology , horticulture , vitis vinifera , botany , ecophysiology , agronomy , photosynthesis , biochemistry , gene
In grapevines, stomatal aperture decreases after a mid‐morning peak during summer days. Afternoon stomatal closure increases in non‐irrigated plants as water limitation progresses, which suggests the involvement of abscisic acid (ABA) in the control of stomatal aperture. The objective of this work was to study the seasonal and diurnal time‐courses of CO 2 assimilation rate, leaf conductance, leaf water potential +, and ABA concentration in xylem sap, leaves, flowers and berries in non‐irrigated field‐grown Tempranillo grapevines throughout reproductive development. Leaf decreased throughout fruit development because water availability decreased towards the end of the reproductive cycle. CO 2 assimilation rate, leaf conductance and xylem ABA concentration also decreased during the course of the growing season. Combining all measurements xylem ABA was either not correlated, or only slightly correlated, with leaf water status + and daily leaf conductance, respectively. This lack of relationship indicates that xylem ABA during fruit ripening had functions other than provision of a non‐hydraulic signal. On a seasonal basis, xylem ABA concentration measured in non‐irrigated grapevines was well related to berry ABA concentration, especially at the end of fruit development (veraison and harvest).