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Title of Journal: Planta

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Abbravation: Planta

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Springer-Verlag

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10.1007/s10304-005-0111-z

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1432-2048

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Identification of upregulated genes in flag leave

Authors: Raul A Sperotto Felipe K Ricachenevsky Guilherme L Duarte Tatiana Boff Karina L Lopes Edilena R Sperb Michael A Grusak Janette Palma Fett
Publish Date: 2009/08/21
Volume: 230, Issue: 5, Pages: 985-1002
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Abstract

Rice is a poor source of micronutrients such as iron and zinc To help clarify the molecular mechanisms that regulate metal mobilization from leaves to developing seeds we conducted suppression subtractive hybridization analysis in flag leaves of two rice cultivars Flag leaves are the major source of remobilized metals for developing seeds We isolated 78 sequences upregulated in flag leaves at the grain filling stage relative to the panicle exertion stage Differential expression of selected genes encoding 7 transport proteins the OsNAS3 enzyme and the OsNAC5 transcription factor was confirmed by quantitative RTPCR We show that OsNAC5 expression is upregulated by natural aging and induced senescence processes dark ABA application high salinity cold and Fedeficiency and its expression is not affected in the presence of 6benzylaminopurine a senescence inhibitor under darkinduced senescence Salt induction of OsNAC5 expression is abolished by nicotinamide an inhibitor of ABA effects This result and the presence of cisacting elements in the promoter region of the OsNAC5 gene suggest an ABAdependent regulation Using four different rice cultivars we show that OsNAC5 upregulation is higher and earlier in flag leaves and panicles of IR75862 plants which have higher seed concentrations of Fe Zn and protein We suggest that OsNAC5 is a novel senescenceassociated ABAdependent NAC transcription factor and its function could be related to Fe Zn and amino acids remobilization from green tissues to seeds

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