Uptake, transport, accumulation and retranslocation of potassium in grapevine rootstocks (Vitis)

Kodur, S. and Tisdall, J. M. and Tang, C. and Walker, R. R. (2011) Uptake, transport, accumulation and retranslocation of potassium in grapevine rootstocks (Vitis). Vitis - Journal of Grapevine Research, 50 (4). pp. 145-149. ISSN 0042-7500

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The concentration and content of potassium (K) within grapevine can be regulated by selective use of rootstocks. However, the mechanisms by which rootstocks differ in the accumulation of K in the shoot of grapevine are not well understood. Therefore, the current study addresses these issues. Ungrafted rootstocks 140 Ruggeri (140 R) and 101-14 Millardet de Grasset (101-14) were exposed to K tracer rubidium (Rb) in a glasshouse, for 4 hours through roots to study uptake and transport of Rb from roots to shoot, and for 24 hours through leaf to study downward transport of Rb, in each case assessed up to 48 hours following exposure to Rb. Transpiration rates and root traits were also measured. Results showed similar total Rb uptake and similar downward transport of Rb between the two rootstocks but lower accumulation of Rb in the shoot and lower shoot/roots Rb concentration (as a result of higher retention of Rb in roots), in 140 R than that in 101-14. Transpiration rates and total root length (but not total root surface area) remained similar between two rootstocks. The study shows that short term differences in the accumulation of K in roots and shoot between rootstocks are due to differences in the transport of K from roots to the shoot, rather than by differences in net uptake or retranslocation of K. In addition, such differences were not affected by transpiration rates. The results highlight that accumulation of K in shoot of grapevine rootstocks is regulated mainly by roots. Key words: Cation, nutrient, root, shoot, translocation, transpiration.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author retains copyright. Creative Commons Attribution 4.0 license.
Faculty/School / Institute/Centre: Historic - Institute for Agriculture and the Environment
Date Deposited: 12 Aug 2016 01:27
Last Modified: 31 Jan 2017 03:38
Uncontrolled Keywords: cation; nutrient; root; shoot; translocation; transpiration
Fields of Research : 07 Agricultural and Veterinary Sciences > 0706 Horticultural Production > 070604 Oenology and Viticulture
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
URI: http://eprints.usq.edu.au/id/eprint/29593

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