Rice increases phosphorus uptake in strongly sorbing soils by intra‐root facilitation

• DOI: 10.1111/pce.14285
• Publication Date: 2022-02-09T12:55:08Z
• Authors: Christian W. Kuppe; Guy J. D. Kirk; Matthias Wissuwa; Johannes A. Postma
• Keywords: Root hair; Root system; DNS root zone; Fibrous root system

Upland rice (Oryza sativa) is adapted to strongly phosphorus (P) sorbing soils. The mechanisms underlying P acquisition, however, are not well understood, and models typically underestimate uptake. This complicates root ideotype development trait-based selection for further improvement. We present a novel model, which correctly simulates the uptake by P-efficient genotype measured over 48 days of growth. model represents morphology at local rhizosphere scale, including hairs fine S-type laterals. It fast- slowly reacting soil P-solubilizing effect root-induced pH changes in soil. Simulations predict that zone solubilization around spreads into than depletion. A needs place laterals outside its depletion- but inside maximize laterals, short hairy, appear be key structures achieve that. Thus, thicker roots facilitate lateral roots. Uptake can enhanced through longer greater length density was less sensitive total class proportions.