The role of root architecture in P acquisition efficiency of different root systems: a case study with common bean and rice

Abstract

Computer modelling and biological experiments were conducted to elucidate the possible role of root architecture in P acquisition efficiency, with common bean representing a tap root system and rice representing a fibrous root system. The modelling results indicated that P uptake could be significantly affected by changes in root architecture. In heterogeneous soils with higher P availability in the upper layers, a shallower root systems tended to be more advantageous for P uptake by the tap root system while a more disperse root system might be better for a fibrous root system. To verify these results from computer modelling, different common bean (Phaseolus vulgaris L.) and rice (Oryza sativa L.) genotypes were investigated in a stratified mesh sand culture experiment. The results indicated a good correlation between root architectural parameters measured in different growth media for both species. Our studies suggest that a shallower root architecture may better explore P-rich upper layer of the soil hence increase P acquisition efficiency in plants.