The Sink-Specific Plastidic Phosphate Transporter PHT4;2 Influences Starch Accumulation and Leaf Size in Arabidopsis.

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Irigoyen, STexas A&M University (författare)

The Sink-Specific Plastidic Phosphate Transporter PHT4;2 Influences Starch Accumulation and Leaf Size in Arabidopsis.

Artikel/kapitelEngelska2011

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2011-09-29
Oxford University Press (OUP),2011

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LIBRIS-ID:oai:gup.ub.gu.se/149691
https://gup.ub.gu.se/publication/149691URI
https://doi.org/10.1104/pp.111.181925DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-74862URI

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Språk:engelska

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Ämneskategori:art swepub-publicationtype

Anmärkningar

Funding Agencies|National Science Foundation|IOS-0416443IOS-0956486|Swedish Research Council|622-2007-517621-2007-5440|Swedish Research Council for Environment, Agriculture, and Space Planning|229-2007-1378|
Nonphotosynthetic plastids are important sites for the biosynthesis of starch, fatty acids, and amino acids. The uptake and subsequent use of cytosolic ATP to fuel these and other anabolic processes would lead to the accumulation of inorganic phosphate (Pi) if not balanced by a Pi export activity. However, the identity of the transporter(s) responsible for Pi export is unclear. The plastid-localized Pi transporter PHT4;2 of Arabidopsis (Arabidopsis thaliana) is expressed in multiple sink organs but is nearly restricted to roots during vegetative growth. We identified and used pht4;2 null mutants to confirm that PHT4;2 contributes to Pi transport in isolated root plastids. Starch accumulation was limited in pht4;2 roots, which is consistent with the inhibition of starch synthesis by excess Pi as a result of a defect in Pi export. Reduced starch accumulation in leaves and altered expression patterns for starch synthesis genes and other plastid transporter genes suggest metabolic adaptation to the defect in roots. Moreover, pht4;2 rosettes, but not roots, were significantly larger than those of the wild type, with 40% greater leaf area and twice the biomass when plants were grown with a short (8-h) photoperiod. Increased cell proliferation accounted for the larger leaf size and biomass, as no changes were detected in mature cell size, specific leaf area, or relative photosynthetic electron transport activity. These data suggest novel signaling between roots and leaves that contributes to the regulation of leaf size.

Ämnesord och genrebeteckningar

NATURVETENSKAP Biologi hsv//swe
NATURAL SCIENCES Biological Sciences hsv//eng
Arabidopsis
root plastid
phosphate trnasporter
leaf size
TECHNOLOGY

Biuppslag (personer, institutioner, konferenser, titlar ...)

Karlsson, PatrikGothenburg University,Göteborgs universitet,Institutionen för växt- och miljövetenskaper,Department of Plant and Environmental Sciences,University of Gothenburg(Swepub:liu)patka94 (författare)
Kuruvilla, JacobLinköpings universitet,Institutionen för klinisk och experimentell medicin,Hälsouniversitetet(Swepub:liu)jacku23 (författare)
Spetea, Cornelia,1968Gothenburg University,Göteborgs universitet,Institutionen för växt- och miljövetenskaper,Department of Plant and Environmental Sciences,University of Gothenburg(Swepub:liu)corsp76 (författare)
Versaw, WKTexas A&M University (författare)
Texas A&M UniversityInstitutionen för växt- och miljövetenskaper (creator_code:org_t)

Sammanhörande titlar

Ingår i:Plant Physiology: Oxford University Press (OUP)157:4, s. 1765-17770032-08891532-2548

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Av författaren/redakt...: Irigoyen, S; Karlsson, Patrik; Kuruvilla, Jacob; Spetea, Cornelia ...; Versaw, WK

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NATURVETENSKAP: NATURVETENSKAP; och Biologi

Artiklar i publikationen: Plant Physiology

Av lärosätet: Göteborgs universitet; Linköpings universitet

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