Comparison of xylem sap mineral concentrations between kiwifruit shoot types using spittlebugs for non-destructive sampling of sap

Functional Plant Biology : FPB
Katrina N BuxtonIan B Ferguson

Abstract

Excreta of the meadow spittlebug [Philaenus spumarius L. (Homoptera: Cercopidae)] feeding on leaves and pedicels of kiwifruit [Actinidia deliciosa (A. Chev.) C.F. Liang et A.R. Ferguson var. deliciosa 'Hayward'] were collected from insects from two different positions in the vine: from long, non-terminating axillary shoots producing fruit that are high in Ca2+ and low in K+ and from short-terminating axillary shoots producing fruit that are low in Ca2+ and high in K+. The Ca2+, Mg2+, K+ and P concentrations in the excreta were determined, and found to be similar to those in the xylem sap. Daily and seasonal changes in xylem sap composition were compared in excreta collected from the two different shoot types. On average, Ca2+ and Mg2+ concentrations were higher and K+ and P concentrations were lower in xylem sap collected from pedicels on long, non-terminating axillary shoots than in sap collected from pedicels on short-terminating shoots. Differences in the mineral concentration between these two shoot types may therefore be due to differences in the xylem sap mineral concentration reaching the fruit. There was no measurable gradient in xylem sap composition within the parent shoots that could explain the differences between s...Continue Reading

Citations

May 10, 2013·Annals of Botany·Mariarosaria MazzeoCristos Xiloyannis

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