Accumulation of potassium in grapevine rootstocks (Vitis) as affected by dry matter partitioning, root traits and transpiration

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Abstract:

Abstract Background and Aims: 

A high concentration of potassium (K) in grape juice can lead to high juice pH (e.g. >3.8) and, in turn, wine of lower quality. The concentration of K in grapevine can be controlled by rootstocks. However, the differences between rootstocks in the accumulation of K in grapevines and mechanisms of regulation of K are not well known. The current study addresses these issues. Methods and Results: 

Rootstocks (on own-roots) Freedom, Schwarzmann, 1103 Paulsen, 110 Richter, 140 Ruggeri and 101-14 Millardet et de Grasset were grown in sand for 56 days in a glasshouse and watered daily with 3 mM K. At Day 56, rootstock 1103 Paulsen had the highest total K uptake, while 101-14 Millardet et de Grasset and 140 Ruggeri had the highest concentration of K in shoot and roots, respectively. Total K uptake in rootstocks was positively related to the dry weight of the whole grapevine, relative growth rate, total root length and total root surface area. Translocation efficiency of K in rootstocks was positively related to shoot : roots dry weight and shoot demand for K per unit root weight. Total K uptake and accumulation of K into the shoot were not affected by transpiration, but concentration of K in the shoot was positively related to the concentration of K in the xylem sap. Conclusions: 

The results show genetic differences between grapevine rootstocks in K uptake and transport, and highlight the importance of growth, dry matter partitioning, root traits and root pressure, and the lack of significance of transpiration, in the accumulation of K.

Keywords: Ca; Na; photosynthesis; shoot/root ratio

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1755-0238.2009.00088.x

Affiliations: 1: Department of Agricultural Sciences, La Trobe University, Bundoora, Vic. 3086, Australia 2: CSIRO Plant Industry, Horticulture Unit, PMB, Merbein, Vic. 3505, Australia

Publication date: June 1, 2010

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