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No published studies have investigated the impact of <jats:styled-content style=\"fixed-case\">P<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">AM<\/jats:styled-content> on the allocation of <jats:styled-content style=\"fixed-case\">N<\/jats:styled-content> to the plant defence, cyanogenic glucosides. We investigated the effects of soil <jats:styled-content style=\"fixed-case\">P<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">AM<\/jats:styled-content> on cyanogenic glucoside (dhurrin) concentration in roots and shoots of two forage sorghum lines differing in cyanogenic potential (<jats:styled-content style=\"fixed-case\">HCNp<\/jats:styled-content>). Two harvest times allowed plants grown at high and low <jats:styled-content style=\"fixed-case\">P<\/jats:styled-content> to be compared at the same age and the same size, to take account of known ontogenetic changes in shoot <jats:styled-content style=\"fixed-case\">HCNp<\/jats:styled-content>. <jats:styled-content style=\"fixed-case\">P<\/jats:styled-content> responses were dependent on ontogeny and tissue type. At the same age, <jats:styled-content style=\"fixed-case\">P<\/jats:styled-content>\u2010limited plants were smaller and had higher shoot <jats:styled-content style=\"fixed-case\">HCNp<\/jats:styled-content> but lower root <jats:styled-content style=\"fixed-case\">HCNp<\/jats:styled-content>. Ontogenetically controlled comparisons showed a <jats:styled-content style=\"fixed-case\">P<\/jats:styled-content> effect of lesser magnitude, and that there was also an increase in the allocation of <jats:styled-content style=\"fixed-case\">N<\/jats:styled-content> to dhurrin in shoots of <jats:styled-content style=\"fixed-case\">P<\/jats:styled-content>\u2010limited plants. Colonization by <jats:styled-content style=\"fixed-case\">AM<\/jats:styled-content> had little effect on shoot <jats:styled-content style=\"fixed-case\">HCNp<\/jats:styled-content>, but increased root <jats:styled-content style=\"fixed-case\">HCNp<\/jats:styled-content> and the allocation of <jats:styled-content style=\"fixed-case\">N<\/jats:styled-content> to dhurrin in roots. Divergent responses of roots and shoots to <jats:styled-content style=\"fixed-case\">P<\/jats:styled-content>, <jats:styled-content style=\"fixed-case\">AM<\/jats:styled-content> and with ontogeny demonstrate the importance of broadening the predominantly foliar focus of plant defence studies\/theory, and of ontogenetically controlled comparisons.<\/jats:p>","DOI":"10.1111\/pce.12209","type":"journal-article","created":{"date-parts":[[2013,10,12]],"date-time":"2013-10-12T01:25:57Z","timestamp":1381541157000},"page":"929-942","source":"Crossref","is-referenced-by-count":38,"title":["Age versus stage: does ontogeny modify the effect of phosphorus and arbuscular mycorrhizas on above\u2010 and below\u2010ground defence in forage sorghum?"],"prefix":"10.1111","volume":"37","author":[{"given":"REBECCA E.","family":"MILLER","sequence":"first","affiliation":[{"name":"Melbourne School of Land and Environment University of Melbourne Burnley Campus  Richmond Victoria 3121 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"ROSLYN M.","family":"GLEADOW","sequence":"additional","affiliation":[{"name":"School of Biological Sciences Monash University  Clayton Victoria 3800 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"TIMOTHY R.","family":"CAVAGNARO","sequence":"additional","affiliation":[{"name":"School of Agriculture Food and Wine The University of Adelaide PMB1  Glen Osmond South Australia 5064 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,11,11]]},"reference":[{"key":"e_1_2_7_2_1","first-page":"111","article-title":"Occurrence of arbuscular mycorrhiza in Castanospermum australe A. 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