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231223s2008 xx |||||o 00| ||eng c |
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|a 10.1111/j.1469-8137.2008.02510.x
|2 doi
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|a eng
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|a Cramer, Michael D
|e verfasserin
|4 aut
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|a Nutrient availability moderates transpiration in Ehrharta calycina
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|c 2008
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 18.11.2008
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|a Date Revised 16.04.2021
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|a published: Print-Electronic
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|a CommentIn: New Phytol. 2008;179(4):905-907. doi: 10.1111/j.1469-8137.2008.02595.x. - PMID 18798891
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|a Citation Status MEDLINE
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|a Transpiration-driven 'mass-flow' of soil-water can increase nutrient flow to the root surface. Here it was investigated whether transpiration could be partially regulated by nutrient status. Seeds of Ehrharta calycina from nine sites across a rainfall gradient were supplied with slow-release fertilizer dibbled into the sand surrounding the roots and directly available through interception, mass-flow and diffusion (dubbed 'interception'), or sequestered behind a 40-microm mesh and not directly accessible by the roots, but from which nutrients could move by diffusion or mass-flow (dubbed 'mass-flow'). Although mass-flow plants were significantly smaller than interception plants as a consequence of nutrient limitation, they transpired 60% faster, had 90% higher photosynthesis relative to transpiration (A/E), and 40% higher tissue P, Ca and Na concentrations than plants allowed to intercept nutrients directly. Tissue N and K concentrations were similar for interception and mass-flow plants. Transpiration was thus higher in the nutrient-constrained 'mass-flow' plants, increasing the transport of nutrients to the roots by mass-flow. Transpiration may have been regulated by N availability, resulting in similar tissue concentration between treatments. It is concluded that, although transpiration is a necessary consequence of photosynthetic CO(2) uptake in C(3) plants, plants can respond to nutrient limitation by varying transpiration-driven mass-flow of nutrients
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Fertilizers
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|a Carbon Dioxide
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|a Nitrogen
|2 NLM
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|a Hoffmann, Vera
|e verfasserin
|4 aut
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|a Verboom, G Anthony
|e verfasserin
|4 aut
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|i Enthalten in
|t The New phytologist
|d 1990
|g 179(2008), 4 vom: 01., Seite 1048-1057
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