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231223s2006 xx ||||| 00| ||eng c |
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|a (NLM)16356944
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Shane, Michael W
|e verfasserin
|4 aut
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|a Systemic suppression of cluster-root formation and net P-uptake rates in Grevillea crithmifolia at elevated P supply
|b a proteacean with resistance for developing symptoms of 'P toxicity'
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|c 2006
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 01.03.2006
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Grevillea crithmifolia R. Br. is a species of Proteaceae that is resistant to developing P-toxicity symptoms at phosphorus supplies in the root environment that induce P-toxicity symptoms in the closely related Hakea prostrata (Proteaceae). It was discovered previously that development of P-toxicity symptoms in H. prostrata is related to its low capacity to down-regulate net P-uptake rates (i.e. its low plasticity). The plasticity of net P-uptake rates and whole-plant growth responses in G. crithmifolia has now been assessed in two separate experiments: (i) a range of P, from 0 to 200 micromol P d-1, was supplied to whole root systems; (ii) using a split-root design, one root half was supplied with 0, 3, 75, or 225 micromol P d-1, while the other root half invariably received 3 micromol P d-1. Fresh mass was significantly greater in G. crithmifolia plants that had received a greater daily P supply during the pretreatments, but symptoms of P toxicity were never observed. Cluster-root growth decreased from about half the total root fresh mass when the leaf [P] was lowest (c. 0.1 mg P g-1 DM) to complete suppression of cluster-root growth when leaf [P] was 1-2 mg P g-1 DM. Split-root studies revealed that cluster-root initiation and growth, and net P-uptake rates by roots were regulated systemically, possibly by shoot P concentration. It is concluded that, in response to higher P supply, G. crithmifolia does not develop symptoms of P toxicity because of (i) greater plasticity of its net P-uptake capacity, and (ii) its greater plasticity for allocating P to growth and P storage in roots. This ecologically important difference in plasticity is most probably related to a slightly higher nutrient availability in the natural habitat of G. crithmifolia when compared with that of H. prostrata
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Phosphorus
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|a 27YLU75U4W
|2 NLM
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|a Lambers, Hans
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 57(2006), 2 vom: 17., Seite 413-23
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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|g volume:57
|g year:2006
|g number:2
|g day:17
|g pages:413-23
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