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Title of Journal: Plant Mol Biol Rep

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Abbravation: Plant Molecular Biology Reporter

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Springer US

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DOI

10.1007/bf01337678

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ISSN

1572-9818

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Transcriptional Regulation of the Rice Phytase Gen

Authors: Chengjin Guo Li Guo Xiaojuan Li Chunying Ma Weiwei Duan Juntao Gu Zhenlong Xu Ruijuan Li Wenjing Lu Kai Xiao
Publish Date: 2013/07/17
Volume: 31, Issue: 6, Pages: 1461-1473
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Abstract

During germination phytate a major phosphate compound in seeds is degraded into inorganic phosphorus Pi for differentiation of new tissues via catalysis OsPHY1 a member of phytase genes in rice has previously been found to show high expression levels in the endosperm and hypocotyl during germination and is involved in the degradation of seed phytate In this study we investigated the transcriptional mechanisms of OsPHY1 via OsPHY1 promoterGUS analysis The results of GUS histochemical staining and activities in tobaccos harboring OsPHY1GUS reveal that the reporter gene is strongly expressed in the hypocotyl and responds to diverse stimuli cues initiated by phytohormones abscisic acid ABA gibberellin GA3 and indole3acetic acid IAA as well as osmotic stresses of salt drought and cold The results indicate that the cisregulatory element CANBNNAPA regulates gene hypocotylpredominant expression ABRE and GAREAT are involved in gene responses to ABA and GA3 respectively and DRECRTCOREAT is involved in gene responses to stresses of salt drought and cold In addition the responses of OsPHY1 and partosmotic stressresponsive genes to salt drought and cold mediated by DRECRTCOREAT are largely accomplished through the ABAdependent pathway with the involvement of the ABA responsive cisregulatory element ABRE Our results reveal that the degradation of seed phytate during germination mediated by OsPHY1 is regulated in a finetune manner with the involvement of diverse cisregulatory elements at the transcription level

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