Journal
BIOTECHNOLOGY LETTERS
Volume 30, Issue 10, Pages 1833-1838Publisher
SPRINGER
DOI: 10.1007/s10529-008-9757-7
Keywords
high-affinity phosphate transporter; Oryza sativa; phosphate acquisition; ricetillers
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Funding
- Korea Research Foundation of the Korean Government [KRF-2003-015-C00640]
- National Research Foundation of Korea [2003-015-C00640] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Most high-affinity phosphate transporter genes (OsPTs) in rice were highly induced in roots when phosphate was depleted. OsPT1, however, was highly expressed in primary roots and leaves regardless of external phosphate concentrations. This finding was confirmed histochemically using transgenic rice plants that express the GUS reporter gene under the control of the OsPT1 promoter, which exhibited high GUS activity even in the phosphate sufficient condition. Furthermore, transgenic rice plants overexpressing the OsPT1 gene accumulated almost twice as much phosphate in the shoots as did wild-type plants. As a result, transgenic plants had more tillers than did wild-type plants, which is a typical physiological indicator for phosphate status in rice.
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