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JXB Advance Access published online on December 1, 2008
Journal of Experimental Botany, doi:10.1093/jxb/ern298
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© The Author [2009]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Proton pump OsA8 is linked to phosphorus uptake and translocation in rice

Chunrong Chang1,2 *, Yibing Hu1 *, Shubin Sun1, Yiyong Zhu1, Guojie Ma1 and Guohua Xu1,{dagger}

1State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
2College of Agronomy, Hainan University, Danzhou, Hainan, 571737, China

{dagger} To whom correspondence should be addressed: E-mail: ghxu{at}njau.edu.cn

The plasma membrane (PM) proton pump ATPases (H+-ATPases) are involved in almost all aspects of biology. They are plant specific and several members of this family are supposed to play a key role in nutrient acquisition. At present, only some members of this gene family in plants have been characterized. However, no nutrient uptake associated H+-ATPase gene in rice has been functionally analysed. It is reported here that OsA8, a typical PM H+-ATPases gene that was predominantly expressed in roots of rice, is down-regulated by nutrient deficiency. The Osa8 mutant had a relatively smaller size and root to shoot biomass ratio, but higher ATPase activity than its wild-type counterparts under phosphorus (P) starvation conditions. Knockout of OsA8 affected the expression of several OsA genes and the high affinity phosphate transporter, OsPT6, and resulted in a higher P concentration in the roots and a lower amount of P in the shoots. These analyses demonstrate that OsA8 not only influences the uptake of P by roots, but also the translocation of P from the roots to the shoots in rice.

Key words: Knockout mutant, plasma membrane H+-ATPase, Oryza sativa, phosphorus, Tos17 retrotransposon, phosphate transporter

* These authors contributed equally to this article

Received 25 July 2008; Revised 29 October 2008 Accepted 31 October 2008


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