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3 matches found in 2 documents. Search time: 0.399 seconds.
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Score: 2.00
Title: OsPHF1 regulates the plasma membrane localization of low and high-affinity inorganic phosphate transporters and determines inorganic phosphate uptake and translocation in rice .
Author: Chen J Liu Y Ni J Wang Y Bai Y Shi J Gan J Wu Z Wu P
Journal: Plant Physiol Citation: V : 157 P : 269-78 Year: 2011 Type: In-Process
Literature: oryza Field: abstract Doc ID: pub21753117 Accession (PMID): 21753117
Abstract: PHOSPHATE TRANSPORTER TRAFFIC FACILITATOR1 ( PHF1 ) is known to regulate the plasma membrane localization of PHT1 ; 1 , a high-affinity inorganic phosphate ( Pi ) transporter in Arabidopsis ( Arabidopsis thaliana ) . OsPHF1 , a rice ( Oryza sativa ) gene homologous to AtPHF1 , was isolated and found to regulate the localization of both low and high-affinity Pi transporters to the plasma membrane . Three OsPHF1 allelic mutants carrying one-point mutations at the fifth WD-repeat motif and two at the transmembrane helix , respectively , showed arsenate resistance and severely reduced Pi accumulation . The data indicate that mutation of OsPHF1 results in the endoplasmic reticulum retention of the low-affinity Pi transporter OsPT2 and high-affinity Pi transporter OsPT8 . Mutation of OsPHF1 also reduced Pi accumulation in plants exhibiting excessive shoot Pi accumulation due to the overexpression of OsPHR2 . However , the transcript level of OsPHF1 itself is not controlled by OsPHR2 . Overexpression of OsPHF1 increased Pi accumulation in both roots and shoots in a solution culture with Pi-supplied condition . These results indicate that the role of OsPHF1 is unique in the localization of both low and high-affinity Pi transporters on the plasma membrane in rice and determines Pi uptake and translocation in rice . The similar function of PHF1 required to facilitate PHT1 transit through the endoplasmic reticulum between Arabidopsis and rice provides an example of expectations from what one would deduce from sequence comparisons to extend knowledge from Arabidopsis to crops .
Matching Sentences:
[ Sen. 1, subscore: 1.00 ]: PHOSPHATE TRANSPORTER TRAFFIC FACILITATOR1 ( PHF1 ) is known to regulate the plasma membrane localization of PHT1 ; 1 , a high-affinity inorganic phosphate ( Pi ) transporter in Arabidopsis ( Arabidopsis thaliana ) .
[ Sen. 9, subscore: 1.00 ]: The similar function of PHF1 required to facilitate PHT1 transit through the endoplasmic reticulum between Arabidopsis and rice provides an example of expectations from what one would deduce from sequence comparisons to extend knowledge from Arabidopsis to crops .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: Investigating the contribution of the phosphate transport pathway to arsenic accumulation in rice .
Author: Wu Z Ren H McGrath SP Wu P Zhao FJ
Journal: Plant Physiol Citation: V : 157 P : 498-508 Year: 2011 Type: In-Process
Literature: oryza Field: abstract Doc ID: pub21715673 Accession (PMID): 21715673
Abstract: Arsenic ( As ) accumulation in rice ( Oryza sativa ) may pose a significant health risk to consumers . Plants take up different As species using various pathways . Here , we investigated the contribution of the phosphate ( Pi ) transport pathway to As accumulation in rice grown hydroponically or under flooded soil conditions . In hydroponic experiments , a rice mutant defective in OsPHF1 ( for phosphate transporter traffic facilitator1 ) lost much of the ability to take up Pi and arsenate and to transport them from roots to shoots , whereas transgenic rice overexpressing either the Pi transporter OsPht1 ; 8 ( OsPT8 ) or the transcription factor OsPHR2 ( for phosphate starvation response2 ) had enhanced abilities of Pi and arsenate uptake and translocation . OsPT8 was found to have a high affinity for both Pi and arsenate , and its overexpression increased the maximum influx by 3 to 5-fold . In arsenate-treated plants , both arsenate and arsenite were detected in the xylem sap , with the proportion of the latter increasing with the exposure time . Under the flooded soil conditions , the phf1 mutant took up less Pi whereas the overexpression lines took up more Pi . But there were no similar effects on As accumulation and distribution . Rice grain contained predominantly dimethylarsinic acid and arsenite , with arsenate being a minor species . These results suggest that the Pi transport pathway contributed little to As uptake and transport to grain in rice plants grown in flooded soil . Transgenic approaches to enhance Pi acquisition from paddy soil through the overexpression of Pi transporters may not increase As accumulation in rice grain .
Matching Sentences:
[ Sen. 7, subscore: 1.00 ]: Under the flooded soil conditions , the phf1 mutant took up less Pi whereas the overexpression lines took up more Pi .
Supplemental links/files: reference in endnote online text related articles pubmed citation
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