Premium
Accumulation of potassium in grapevine rootstocks ( Vitis ) as affected by dry matter partitioning, root traits and transpiration
Author(s) -
KODUR S.,
TISDALL J.M.,
TANG C.,
WALKER R.R.
Publication year - 2010
Publication title -
australian journal of grape and wine research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.65
H-Index - 77
eISSN - 1755-0238
pISSN - 1322-7130
DOI - 10.1111/j.1755-0238.2009.00088.x
Subject(s) - rootstock , xylem , shoot , transpiration , dry matter , horticulture , dry weight , potassium , chemistry , root system , agronomy , botany , biology , photosynthesis , organic chemistry
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.