OsPAP10c, a novel secreted acid phosphatase in rice, plays an important role in the utilization of external organic phosphorus.
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| Abstract |
Under phosphate (Pi ) starvation, plants increase the secretion of purple acid phosphatases (PAPs) into the rhizosphere to scavenge organic phosphorus (P) for plant use. To date, only a few members of the PAP family have been characterized in crops. In this study, we identified a novel secreted PAP in rice, OsPAP10c, and investigated its role in the utilization of external organic P. OsPAP10c belongs to a monocotyledon-specific subclass of Ia group PAPs and is specifically expressed in the epidermis/exodermis cell layers of roots. Both the transcript and protein levels of OsPAP10c are strongly induced by Pi starvation. OsPAP10c overexpression increased acid phosphatase (APase) activity by more than 10-fold in the culture media and almost fivefold in both roots and leaves under Pi -sufficient and Pi -deficient conditions. This increase in APase activity further improved the plant utilization efficiency of external organic P. Moreover, several APase isoforms corresponding to OsPAP10c were identified using in-gel activity assays. Under field conditions with three different Pi supply levels, OsPAP10c-overexpressing plants had significantly higher tiller numbers and shorter plant heights. This study indicates that OsPAP10c encodes a novel secreted APase that plays an important role in the utilization of external organic P in rice.
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| Authors | Linghong Lu, Wenmin Qiu, Wenwen Gao, Stephen D Tyerman, Huixia Shou, Chuang Wang |
| Journal | Plant, cell & environment (Plant Cell Environ) Vol. 39 Issue 10 Pg. 2247-59 (10 2016) ISSN: 1365-3040 [Electronic] United States |
| PMID | 27411391 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
| Copyright | © 2016 John Wiley & Sons Ltd. |
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