Cotton genes that control phosphorus uptake could cut fertilizer needs
Iqbal A, Junyan Z, Ullah I, Mahmood T, Shah ST
Crop Improvement
Cotton fields worldwide are routinely over-fertilized with phosphorus because the plant struggles to absorb it efficiently, and that runoff feeds algal blooms in the rivers and lakes downstream from farms.
Plants can't just drink phosphorus from the soil like water; they need special proteins to break it apart and pull it in through their roots. Scientists scoured the entire genetic blueprint of four types of cotton and found 202 of these proteins, then figured out which ones are most important for absorbing phosphorus, surviving stress, and even growing the fibers we weave into fabric. By knowing exactly which genes do the heavy lifting, breeders can now develop cotton varieties that get more nutrition from less fertilizer.
Key Findings
202 purple acid phosphatase proteins were identified across four cotton species: 63 in G. hirsutum, 69 in G. barbadense, and 35 each in G. arboreum and G. raimondii, all grouped into 8 conserved subgroups.
Gene expansion was driven primarily by segmental and whole-genome duplication events, with most genes kept under purifying (stabilizing) selection, indicating these functions are critical to survival.
Four hub genes were identified with distinct roles: Gh_A13G1171 (vegetative growth), Gh_D05G1806 (reproduction), Gh_D05G0522 (fiber development), and Gh_A03G0451 (phosphorus metabolism).
chevron_right Technical Summary
Researchers mapped all purple acid phosphatase (PAP) genes across four cotton species, identifying 202 proteins that help cotton absorb phosphorus from soil. The study pinpoints specific hub genes controlling root nutrient uptake, fiber growth, and stress tolerance, offering concrete breeding targets to grow cotton with less fertilizer.
Abstract Preview
Original paper
Systematic characterization of purple acid phosphatases provides targets for improving phosphorus use efficiency in cotton.
Purple acid phosphatase (PAP) genes are central to plant phosphorus metabolism and stress adaptation. However, their genome-wide characterization and functional roles in cotton remain unclear. Cott...
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