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Scions influence apparent transpiration efficiency of Vitis vinifera (cv. Shiraz) rather than rootstocks
Author(s) -
VIRGONA JAMES M.,
SMITH JASON P.,
HOLZAPFEL BRUNO P.
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.tb00268.x
Subject(s) - rootstock , transpiration , horticulture , vitis vinifera , biology , botany , agronomy , photosynthesis
Carbon isotope discrimination (Δ) is used to determine differences in apparent transpiration efficiency amongst genotypes of many C 3 plant species. In this present study the possible influence of certain commercially‐available rootstocks on apparent transpiration efficiency in grapevines was investigated. Variation in Δ was studied for Shiraz and each of six rootstock varieties when grown either (1) on their own roots, (2) with Shiraz grafted as a scion onto different rootstocks (conventional graft) or (3) with rootstock varieties grafted onto Shiraz roots (reciprocal graft). When grown on own roots or as a reciprocal graft, there was significant variation in Δ. In contrast, there was no significant variation in Δ for Shiraz (as a scion variety) when grafted onto different rootstock varieties (conventional graft). These results imply a predominance by the scion genotype in determining variation in the leaf‐level physiological characteristics that determine apparent transpiration efficiency under well‐watered (and non‐saline) conditions.