Phosphorus (P) found in rice grains originates from two possible sources that are exogenous (post-flowering P uptake from soil) or endogenous (P remobilisation from vegetative parts). Julia et al. investigate P partitioning and P remobilisation throughout rice grain filling.
They demonstrate that post-flowering P uptake from soil is a critical contributor to the grains’ P content in irrigated rice. In the light of a P tracer study, and propose a model of P loading into grains that should be considered in any attempt to breed rice cultivars with lower grains P content.
Cécile Julia, Matthias Wissuwa, Tobias Kretzschmar, Kwanho Jeong, Terry Rose, 2016, 'Phosphorus uptake, partitioning and redistribution during grain filling in rice', Annals of Botany, vol. 118, no. 6, pp. 1151-1162 http://dx.doi.org/10.1093/aob/mcw164