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Title: Involvement of OsSPX1 in phosphate homeostasis in rice .
Author: Wang C Ying S Huang H Li K Wu P Shou H
Journal: Plant J Citation: V : 57 P : 895-904 Year: 2009 Type: MEDLINE
Literature: oryza Field: abstract Doc ID: pub19000161 Accession (PMID): 19000161
Abstract: Arabidopsis thaliana SPX ( SYG/PHO81/XPR1 ) domain genes have recently been shown to be involved in the phosphate ( Pi ) signaling pathway . We show here that a rice ( Oryza sativa ) SPX gene , OsSPX1 , is specifically induced by Pi starvation in roots . Suppression of OsSPX1 by RNA interference resulted in severe signs of toxicity caused by the over-accumulation of Pi , similar to that found in OsPHR2 ( phosphate starvation response transcription factor 2 ) overexpressors and pho2 ( phosphate-responsive mutant 2 ) . Quantitative RT-PCR showed that expression of OsSPX1 was strongly induced in OsPHR2 overexpression and pho2 mutant plants , indicating that OsSPX1 occurs downstream of OsPHR2 and PHO2 . The expression of 10 genes associated with the phosphate-starvation signal pathways was analyzed . Expression of OsPT2 ( phosphate transporter 2 ) and OsPT8 was significantly induced in OsSPX1-RNAi ( OsSPX1-Ri ) plants , suggesting that over-accumulation of Pi in OsSPX1-Ri plants results from an increase in Pi transport . In contrast , overexpression of OsSPX1 suppressed the induction of expression by Pi starvation of all 10 phosphate starvation-induced genes tested : IPS1 ( induced by phosphate starvation 1 ) , IPS2 , OsPAP10 ( purple acid phosphatase 10 ) , OsSQD2 ( sulfoquinovosyldiacylglycerol 2 ) , miR399d and miR399j ( microRNA 399 ) , OsPT2 , OsPT3 , OsPT6 and OsPT8 . This suggests that OsSPX1 acts via a negative feedback loop to optimize growth under phosphate-limited conditions .
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[ Sen. 7, subscore: 1.00 ]: In contrast , overexpression of OsSPX1 suppressed the induction of expression by Pi starvation of all 10 phosphate starvation-induced genes tested : IPS1 ( induced by phosphate starvation 1 ) , IPS2 , OsPAP10 ( purple acid phosphatase 10 ) , OsSQD2 ( sulfoquinovosyldiacylglycerol 2 ) , miR399d and miR399j ( microRNA 399 ) , OsPT2 , OsPT3 , OsPT6 and OsPT8 .
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