Phosphorus speciation of dormant grapevine (Vitis vinifera L.) canes in the Barossa Valley, South Australia
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A. L. Doolette [1] ; R. J. Smernik [1]
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[1] University of Adelaide
University of Adelaide
Australia
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- Localización: Australian journal of grape and wine research, ISSN 1322-7130, Vol. 22, Nº 3, 2016, págs. 462-468
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Background and Aims The phosphorus (P) contained in annual prunings can represent a substantial proportion of annual vineyard P addition. Availability of P to the growing vines is controlled by the forms of P present. Solution 31P nuclear magnetic resonance spectroscopy was used to investigate the chemical composition of P in dormant canes taken from two cultivars of Vitis vinifera L., Shiraz and Viognier, collected from nine vineyards.
Methods and Results The main forms of P detected were similar, although the proportion of these varied; orthophosphate comprised 37–57% of total P, phospholipids 8-15%, myo-inositol hexakisphosphate (phytate) 20–34% and a specific isomer of myo-inositol pentakisphosphate (rarely identified previously in plant material) 9–25%; DNA and pyrophosphate contributed <1% of total P. Variation in P composition appeared unrelated to grape cultivar, but varied with vine P status. Higher total P concentration correlated with proportionately more orthophosphate and phytate.
Conclusions Grapevine prunings represent a nearly equal combination of immediately available and potentially recalcitrant forms of P.
Significance of the Study This study is one of the first to examine the P composition of dormant grapevine canes, which is a prerequisite to predicting the contribution they make to P nutrition.
