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Type: Journal article
Title: Age versus stage: does ontogeny modify the effect of phosphorus and arbuscular mycorrhizas on above- and below-ground defence in forage sorghum?
Author: Miller, R.
Gleadow, R.
Cavagnaro, T.
Citation: Plant, Cell & Environment, 2014; 37(4):929-942
Publisher: Wiley
Issue Date: 2014
ISSN: 0140-7791
Statement of
Rebecca E. Miller, Roslyn M. Gleadow and Timothy R. Cavagnaro
Abstract: Arbuscular mycorrhizas (AM) can increase plant acquisition of P and N. No published studies have investigated the impact of P and AM on the allocation of N to the plant defence, cyanogenic glucosides. We investigated the effects of soil P and AM on cyanogenic glucoside (dhurrin) concentration in roots and shoots of two forage sorghum lines differing in cyanogenic potential (HCNp). Two harvest times allowed plants grown at high and low P to be compared at the same age and the same size, to take account of known ontogenetic changes in shoot HCNp. P responses were dependent on ontogeny and tissue type. At the same age, P-limited plants were smaller and had higher shoot HCNp but lower root HCNp. Ontogenetically controlled comparisons showed a P effect of lesser magnitude, and that there was also an increase in the allocation of N to dhurrin in shoots of P-limited plants. Colonization by AM had little effect on shoot HCNp, but increased root HCNp and the allocation of N to dhurrin in roots. Divergent responses of roots and shoots to P, AM and with ontogeny demonstrate the importance of broadening the predominantly foliar focus of plant defence studies/theory, and of ontogenetically controlled comparisons.
Keywords: Cyanogenesis; dhurrin; nitrogen; phenotypic plasticity; plant defence; roots; resource allocation
Description: Article first published online: 11 NOV 2013
Rights: © 2013 John Wiley & Sons Ltd
RMID: 0020135631
DOI: 10.1111/pce.12209
Grant ID:
Appears in Collections:Agriculture, Food and Wine publications

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