Duplicate and Conquer: Multiple Homologs of PHOSPHORUS-STARVATION TOLERANCE1 Enhance Phosphorus Acquisition and Sorghum Performance on Low-Phosphorus Soils

Hufnagel, B and De Sousa, S M and Assis, L and Guimaraes, C T and Leiser, W and Azevedo, G C and Negri, B and Larson, B G and Shaff, J E and Pastina, M M and Barros, B A and Weltzien, E and Rattunde, H F W and Viana, J H and Clark, R T and Falcão, A and Gazaffi, R and Garcia, A A F and Schaffert, R E and Kochian, L V and Magalhaes, J V (2014) Duplicate and Conquer: Multiple Homologs of PHOSPHORUS-STARVATION TOLERANCE1 Enhance Phosphorus Acquisition and Sorghum Performance on Low-Phosphorus Soils. Plant Physiology, 166. pp. 659-677. ISSN 0032-0889

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Low soil phosphorus (P) availability is a major constraint for crop production in tropical regions. The rice (Oryza sativa) protein kinase, PHOSPHORUS-STARVATION TOLERANCE1 (OsPSTOL1), was previously shown to enhance P acquisition and grain yield in rice under P deficiency. We investigated the role of homologs of OsPSTOL1 in sorghum (Sorghum bicolor) performance under low P. Association mapping was undertaken in two sorghum association panels phenotyped for P uptake, root system morphology and architecture in hydroponics and grain yield and biomass accumulation under low-P conditions, in Brazil and/or in Mali. Root length and root surface area were positively correlated with grain yield under low P in the soil, emphasizing the importance of P acquisition efficiency in sorghum adaptation to low-P availability. SbPSTOL1 alleles reducing root diameter were associated with enhanced P uptake under low P in hydroponics, whereas Sb03g006765 and Sb03g0031680 alleles increasing root surface area also increased grain yield in a low-P soil. SbPSTOL1 genes colocalized with quantitative trait loci for traits underlying root morphology and dry weight accumulation under low P via linkage mapping. Consistent allelic effects for enhanced sorghum performance under low P between association panels, including enhanced grain yield under low P in the soil in Brazil, point toward a relatively stable role for Sb03g006765 across genetic backgrounds and environmental conditions. This study indicates that multiple SbPSTOL1 genes have a more general role in the root system, not only enhancing root morphology traits but also changing root system architecture, which leads to grain yield gain under low-P availability in the soil.

Item Type: Article
Divisions: RP-Dryland Cereals
CRP: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: Sorghum, Soil phosphorus, Crop production
Subjects: Mandate crops > Sorghum
Depositing User: Mr Ramesh K
Date Deposited: 28 Sep 2015 08:37
Last Modified: 19 Oct 2016 04:19
URI: http://oar.icrisat.org/id/eprint/9023
Official URL: http:/​/​dx.​doi.​org/​10.​1104/​pp.​114.​243949
Acknowledgement: We thank Drs. Matthias Wissuwa (Japan International Research Center for Agricultural Sciences) and Sigrid Heuer (Australian Centre for Plant Functional Genomics) for useful discussions about PSTOL1 genes in rice and sorghum.
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