Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 22, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/ijms22179311
Keywords
maize; P stress; phosphorus use efficiency; genome-wide association study; gene ontology analysis; phylogenetic characterization
Funding
- National Key Research and Development Program of China [2016YFD0101201, 2018YFD0100201]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [328017493/GRK 2366]
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The study analyzed the biomass, grain yield, and phosphorus use efficiency (PUE)-related traits of 359 maize inbred lines grown under low-P and normal-P conditions. It identified candidate genes for various traits under different phosphorus conditions and characterized key genes related to phosphate transporters or stress responses. The research provides insights into the genetic dissection and molecular characterization of PUE in maize, highlighting the importance of selecting genotypes with high phosphorus use efficiency.
Phosphorus (P) deficiency is an important challenge the world faces while having to increase crop yields. It is therefore necessary to select maize (Zea may L.) genotypes with high phosphorus use efficiency (PUE). Here, we extensively analyzed the biomass, grain yield, and PUE-related traits of 359 maize inbred lines grown under both low-P and normal-P conditions. A significant decrease in grain yield per plant and biomass, an increase in PUE under low-P condition, as well as significant correlations between the two treatments were observed. In a genome-wide association study, 49, 53, and 48 candidate genes were identified for eleven traits under low-P, normal-P conditions, and in low-P tolerance index (phenotype under low-P divided by phenotype under normal-P condition) datasets, respectively. Several gene ontology pathways were enriched for the genes identified under low-P condition. In addition, seven key genes related to phosphate transporter or stress response were molecularly characterized. Further analyses uncovered the favorable haplotype for several core genes, which is less prevalent in modern lines but often enriched in a specific subpopulation. Collectively, our research provides progress in the genetic dissection and molecular characterization of PUE in maize.
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