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Title: Identification of OsbHLH133 as a regulator of iron distribution between roots and shoots in Oryza sativa .
Author: Wang L Ying Y Narsai R Ye L Zheng L Tian J Whelan J Shou H
Journal: Plant Cell Environ Citation: V : P : Year: 2012 Type: Publisher
Literature: oryza Field: abstract Doc ID: pub22755510 Accession (PMID): 22755510
Abstract: Iron ( Fe ) is an essential micronutrient element for plant growth . Regulation of Fe-deficiency signalling networks is one of the many functions reported for basic helix-loop-helix ( bHLH ) transcription factors in plants . In the present study , OsbHLH133 was found to be induced by Fe-deficiency conditions in Oryza sativa . Insertional inactivation of OsbHLH133 ( bhlh133 ) resulted in growth retardation , with enhanced Fe concentration seen in shoots , and reduced Fe concentration in roots . Overexpression of OsbHLH133 had the opposite effect , that is resulted in an enhanced Fe concentration in roots and reduced Fe concentration in shoots and also in xylem sap . Microarray analysis showed that some of the genes encoding Fe-related functions were up-regulated under Fe-sufficient conditions , in bhlh133 mutant plants compared to wild-type plants . Significant differential expression of a number of signalling pathways , including calcium signalling , was also seen in bhlh133 plants compared to wild-type plants , independent of Fe conditions .
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[ Sen. 4, subscore: 1.00 ]: Insertional inactivation of OsbHLH133 ( bhlh133 ) resulted in growth retardation , with enhanced Fe concentration seen in shoots , and reduced Fe concentration in roots .
[ Sen. 6, subscore: 1.00 ]: Microarray analysis showed that some of the genes encoding Fe-related functions were up-regulated under Fe-sufficient conditions , in bhlh133 mutant plants compared to wild-type plants .
[ Sen. 7, subscore: 1.00 ]: Significant differential expression of a number of signalling pathways , including calcium signalling , was also seen in bhlh133 plants compared to wild-type plants , independent of Fe conditions .
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