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Plant Cell Physiol. 2018 Aug 1;59(8):1683-1694. doi: 10.1093/pcp/pcy094.

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

Liu F1,2, Xu Y1,3, Han G1,3, Wang W1,3, Li X1,3, Cheng B1,3.

Author information

1
National Engineering Laboratory of Crop Stress Resistance, Anhui Agricultural University, No. 130, Changjiang West Road, Hefei, China.
2
College of Agronomy, Anhui Agricultural University, No. 130, Changjiang West Road, Hefei, China.
3
School of Life Sciences, Anhui Agricultural University, No. 130, Changjiang West Road, Hefei, China.

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-inducible Pi transporter gene involved in Pi uptake.

PMID:
29767790
DOI:
10.1093/pcp/pcy094
[Indexed for MEDLINE]

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