Identification and Functional Characterization of a Maize Phosphate Transporter Induced by Mycorrhiza Formation

Plant & Cell Physiology
Fang LiuBeijiu Cheng

Abstract

Phosphorus (P) is an essential macronutrient for plant life, although it is frequently not readily available to crops. Arbuscular mycorrhiza fungi (AMF) can improve plant P levels by inducing the expression of some phosphate (Pi) transporters. Symbiotic Pi uptake by Pi transporters is crucial for AMF colonization and arbuscule dynamics. However, the functions of mycorrhiza-inducible maize Pi transporters are largely unclear. We focused on the interaction between the Pi concentration and AMF colonization in maize, and detecting the induction of a Pi transporter. We investigated AMF colonization and arbuscular development in maize under high and low Pi environments. Low Pi increased AMF colonization and promoted arbuscular development. Further measurement of P concentration showed that AMF significantly improved the maize P status under low Pi conditions. Here, we identified the Pi transporter gene, ZmPt9, which was induced by mycorrhiza formation. In addition, ZmPt9-overexpressing roots were difficult to colonize by AMF. Pi response analysis showed that ZmPt9 complements a yeast mutant defective in Pi transporter activity and improves the P concentration in rice. Together, these data indicated that ZmPt9 is a mycorrhiza-inducibl...Continue Reading

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Citations

Mar 8, 2019·The New Phytologist·Daniel WipfPierre-Emmanuel Courty
May 21, 2020·Plant Biotechnology Journal·Fang WangYi-Fang Chen
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Dec 14, 2021·The Plant Journal : for Cell and Molecular Biology·Mingjie HeWaltraud X Schulze

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