Shoot Heterogeneity Effects on Shiraz/Richter 99 Grapevines. III. Leaf Chlorophyll Content
Abstract
In this study, the leaf chlorophyll content of normally developed and underdeveloped shoots was compared in anattempt to quantify the effect of shoot heterogeneity in a Shiraz/Richter 99 vineyard, located in the Stellenbosch area
of the Western Cape, South Africa. Comparisons are also made between normally developed and underdeveloped
shoots from shaded and well-exposed canopies. No positive correlation was found between the photosynthetic
activity and the chlorophyll concentration of the leaves at five weeks after véraison. Equal amounts of chlorophyll
per cm2 and a non-significant difference in the assimilation rate were calculated for the leaves of normally developed
and underdeveloped shoots. No significant differences were found between the shaded and well-exposed canopies. It
therefore appears that it is the effective surface area per leaf or per shoot rather than the chlorophyll concentration
or activity that may be responsible for any apparent difference in the photosynthetic output of the leaves from
normally developed and underdeveloped shoots in shaded or well-exposed canopies.
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