Membrane Structure and the Study of Solute Transport Across Plant Membranes

Gilliham, Matthew

doi:10.1002/9780470988862.ch4

Plant Solute Transport 2007

DOI: 10.1002/9780470988862.ch4

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Membrane Structure and the Study of Solute Transport Across Plant Membranes

Matthew Gilliham¹

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Cited by 2 publications

References 133 publications

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Comparative physiology of elemental distributions in plants

2010

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Element accumulation patterns are clearly defined by expression of key ion or solute transporters. Although the location of element accumulation is fairly robust, alterations in expression of certain solute transporters, through genetic modifications or by growth under stress, result in perturbations to these patterns. However, redundancy or induced pleiotropic expression effects may complicate attempts to characterize the pathways that lead to cell-specific elemental distribution. Accumulation of one element often has consequences on the accumulation of others, which seems to be driven largely to maintain vacuolar and cytoplasmic osmolarity and charge balance, and also serves as a detoxification mechanism. Altered cell-specific transcriptomics can be shown, in part, to explain some of this compensation.

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Comparative physiology of elemental distributions in plants

2010

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Nutrient availability moderates transpiration in Ehrharta calycina

2008

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Summary• 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-µm 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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Membrane Structure and the Study of Solute Transport Across Plant Membranes

Cited by 2 publications

References 133 publications

Comparative physiology of elemental distributions in plants

Comparative physiology of elemental distributions in plants

Nutrient availability moderates transpiration in Ehrharta calycina

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