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Crop species differ in root plasticity response to localised P supply

Rose, T.J., Rengel, Z., Ma, Q. and Bowden, J.W. (2009) Crop species differ in root plasticity response to localised P supply. Journal of Plant Nutrition and Soil Science, 172 (3). pp. 360-368.

Link to Published Version: http://dx.doi.org/10.1002/jpln.200800031
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Abstract

The effect of localised phosphorus (P) fertiliser placement and in particular, deep P fertiliser placement, on the comparative root growth and P uptake of fibrous vs tap-rooted crops is not known. In this study, we examined the root growth and P uptake of wheat (Triticum aestivum L), canola (Brassica napus L), and narrow-leaf lupin (Lupinus angustifolius L) in a split-root system and in columns with deep (19 cm) or shallow (5 cm) P fertiliser sources in glasshouse conditions. In the split-root system, plants of all three species grown under heterogeneous soil P conditions absorbed more P and produced greater root and shoot biomass than those under homogeneous P supply. Root plasticity differed between species under heterogeneous soil P supply: canola and wheat allocated relatively more root biomass and root length to the high P zone than narrow-leaf lupin. In the column experiment, there was no difference in the amount of P accumulated in shoots of any crops grown in the deep vs shallow P fertiliser treatments. Root proliferation occurred within the shallow and deep-P fertiliser bands in all three species; however, root distribution above or below the bands did not differ between deep or shallow P fertiliser treatments in any species. Whilst root plasticity responses to heterogeneous soil P supply differed among species, root architecture (fibrous vs taproot) did not confer any advantage or disadvantage to the acquisition of P from deep vs shallow P fertiliser bands. Moreover, whilst roots proliferate in the vicinity of P fertiliser bands, root distribution outside of the bands appears to remain unaltered in both fibrous and tap-rooted crops during early growth.

Publication Type: Journal Article
Publisher: WILEY-VCH Verlag
Copyright: © 2009 WILEY-VCH Verlag GmbH & Co. KGaA.
URI: http://researchrepository.murdoch.edu.au/id/eprint/32548
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