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Salt priming improves establishment of Distichlis spicata under saline conditions

M. Sargeant A B, P. Sale A and C. Tang A

A Department of Agricultural Sciences, La Trobe University, Bundoora, Vic. 3086, Australia.
B Corresponding author. Email: mrsargeant@students.latrobe.edu.au


Abstract

Salt priming as a tool to establish Distichlis spicata (L.) Greene cv. Yensen-4a (NyPa Forage) plants into saline conditions was investigated in sand culture. Plants were pre-treated with 3 levels of salinity (0, 2, and 4 g NaCl/kg sand) for 36 days and then transplanted into 4 salinity treatments of 0, 2, 4, and 8 g NaCl/kg sand. Soil electrical conductivity (EC), Na and Cl concentrations in the sand, growth initiation, tiller formation, dry matter production, and salt excretion and uptake were measured. Plants pre-treated with 4 g NaCl/kg sand produced 6-fold more dry matter than plants pre-treated with 0 and 2 g NaCl/kg sand when transplanted into sand containing 2 g NaCl/kg. Survival and tiller formation were also higher with plants that had been pre-treated with 4 g NaCl/kg sand compared with plants pre-treated with 0 and 2 g NaCl/kg, when transplanted into 2 and 4 g NaCl/kg sand. The results suggest that salt priming improves establishment of Distichlis spicata when transplanted into low to moderate salinity conditions.

Keywords: halophyte, salt grass, NyPa Forage, salt tolerance, vegetative establishment, saltland pasture.

Australian Journal of Agricultural Research 57(12) 1259–1265    doi:10.1071/AR06103
Submitted: 31 March 2006    Accepted: 4 September 2006    Published: 21 November 2006





   
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