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Nat Genet
2021 Jun 01;536:906-915. doi: 10.1038/s41588-021-00855-6.
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A plasma membrane transporter coordinates phosphate reallocation and grain filling in cereals.
Ma B
,
Zhang L
,
Gao Q
,
Wang J
,
Li X
,
Wang H
,
Liu Y
,
Lin H
,
Liu J
,
Wang X
,
Li Q
,
Deng Y
,
Tang W
,
Luan S
,
He Z
.
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Phosphate (Pi) is essential to plant growth and crop yield. However, it remains unknown how Pi homeostasis is maintained during cereal grain filling. Here, we identified a rice grain-filling-controlling PHO1-type Pi transporter, OsPHO1;2, through map-based cloning. Pi efflux activity and its localization to the plasma membrane of seed tissues implicated a specific role for OsPHO1;2 in Pi reallocation during grain filling. Indeed, Pi over-accumulated in developing seeds of the Ospho1;2 mutant, which inhibited the activity of ADP-glucose pyrophosphorylase (AGPase), important for starch synthesis, and the grain-filling defect was alleviated by overexpression of AGPase in Ospho1;2-mutant plants. A conserved function was recognized for the maize transporter ZmPHO1;2. Importantly, ectopic overexpression of OsPHO1;2 enhanced grain yield, especially under low-Pi conditions. Collectively, we discovered a mechanism underlying Pi transport, grain filling and P-use efficiency, providing an efficient strategy for improving grain yield with minimal P-fertilizer input in cereals.
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