Ramsey rootstock has previously been
implicated in an approximate
8-fold increase of 3-isobutyl-2-methoxypyrazine (IBMP) levels in the
rachis (grape bunch stem) of Vitis vinifera L. cv. Shiraz scions over own-rooted Shiraz vines at harvest. IBMP
extracted from rachis during red wine fermentation can contribute
potent “green” flavors. Methoxypyrazines (MPs) are normally
present in Cabernet Sauvignon grapes, rachis, and wines, but it is
unknown whether rootstocks can influence the MP concentration in the
rachis. This study considered the effect of eight rootstocks including
Ramsey and own roots on the concentrations of IBMP, 3-isopropyl-2-methoxypyrazine
(IPMP), and 3-sec-butyl-2-methoxypyrazine (SBMP)
in the rachis and grapes of Cabernet Sauvignon over two seasons. IBMP
predominated, and its concentration in rachis and berries at harvest
was significantly affected by rootstock and growing season. In the
2020 vintage, light exclusion, vine vigor, and spatial variation in
vine vigor were shown to significantly affect MP concentrations in
rachis.
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