Rice phosphate transporter reduces the low phosphate response through jasmonate signaling.
Mani B, Maurya K, Verma L, Gupta P, Kohli PS
Crop Improvement
Rice paddies worldwide get drenched in phosphate fertilizer partly because the plant panics and stunts itself even when phosphorus is available — and this study found the molecular switch that turns that panic off.
Rice has a protein that normally ships phosphorus from roots up to the rest of the plant, but scientists found that one piece of this protein has a second, surprising job: it quiets a hormonal stress signal that makes the plant think it's starving. When that calming piece was present, young rice plants grew better and stopped overreacting to low-phosphorus conditions. The catch is that seeds still didn't develop well, so breeders will need to solve that puzzle before this insight becomes a field-ready crop.
Key Findings
The SPX-containing EXS domain fragment of OsPHO1;2 improved early seedling growth independently of phosphate transport, even though shoot phosphate levels remained low
S-EXS rice lines showed reduced jasmonic acid accumulation and attenuated phosphate starvation gene responses, mirroring wild-type hormone profiles despite lacking full transporter function
Both partial-domain lines (S-EXS and T-EXS) retained seed development defects and reduced seed phosphorus content, indicating the full protein is required for reproductive function
chevron_right Technical Summary
Researchers discovered that a specific protein segment in rice does more than move phosphorus around — it actively calms the plant's stress alarm system, helping rice grow better even when phosphorus is scarce. This opens a new path for breeding crops that use fertilizer more efficiently.
Abstract Preview
Phosphorus (P) is an essential macronutrient for plant growth, and its deficiency severely limits crop productivity. The PHOSPHATE1 (PHO1) protein family, defined by an N-terminal SPX domain, four ...
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