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Article

Genetic Diversity of C4 Photosynthesis Pathway Genes in Sorghum bicolor (L.)

1
Queensland Alliance for Agriculture and Food Innovation (QAAFI), The University of Queensland, Hermitage Research Facility, Warwick, QLD 4370, Australia
2
Agri-Science Queensland, Department of Agriculture and Fisheries (DAF), Hermitage Research Facility, Warwick, QLD 4370, Australia
3
BGI Genomics, BGI-Shenzhen, Shenzhen 518083, China
*
Author to whom correspondence should be addressed.
Genes 2020, 11(7), 806; https://doi.org/10.3390/genes11070806
Received: 24 June 2020 / Revised: 9 July 2020 / Accepted: 13 July 2020 / Published: 16 July 2020
(This article belongs to the Section Plant Genetics and Genomics)
C4 photosynthesis has evolved in over 60 different plant taxa and is an excellent example of convergent evolution. Plants using the C4 photosynthetic pathway have an efficiency advantage, particularly in hot and dry environments. They account for 23% of global primary production and include some of our most productive cereals. While previous genetic studies comparing phylogenetically related C3 and C4 species have elucidated the genetic diversity underpinning the C4 photosynthetic pathway, no previous studies have described the genetic diversity of the genes involved in this pathway within a C4 crop species. Enhanced understanding of the allelic diversity and selection signatures of genes in this pathway may present opportunities to improve photosynthetic efficiency, and ultimately yield, by exploiting natural variation. Here, we present the first genetic diversity survey of 8 known C4 gene families in an important C4 crop, Sorghum bicolor (L.) Moench, using sequence data of 48 genotypes covering wild and domesticated sorghum accessions. Average nucleotide diversity of C4 gene families varied more than 20-fold from the NADP-malate dehydrogenase (MDH) gene family (θπ = 0.2 × 10−3) to the pyruvate orthophosphate dikinase (PPDK) gene family (θπ = 5.21 × 10−3). Genetic diversity of C4 genes was reduced by 22.43% in cultivated sorghum compared to wild and weedy sorghum, indicating that the group of wild and weedy sorghum may constitute an untapped reservoir for alleles related to the C4 photosynthetic pathway. A SNP-level analysis identified purifying selection signals on C4 PPDK and carbonic anhydrase (CA) genes, and balancing selection signals on C4 PPDK-regulatory protein (RP) and phosphoenolpyruvate carboxylase (PEPC) genes. Allelic distribution of these C4 genes was consistent with selection signals detected. A better understanding of the genetic diversity of C4 pathway in sorghum paves the way for mining the natural allelic variation for the improvement of photosynthesis. View Full-Text
Keywords: sorghum; C4 pathway; genetic diversity; SNPs; domestication sorghum; C4 pathway; genetic diversity; SNPs; domestication
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MDPI and ACS Style

Tao, Y.; George-Jaeggli, B.; Bouteillé-Pallas, M.; Tai, S.; Cruickshank, A.; Jordan, D.; Mace, E. Genetic Diversity of C4 Photosynthesis Pathway Genes in Sorghum bicolor (L.). Genes 2020, 11, 806. https://doi.org/10.3390/genes11070806

AMA Style

Tao Y, George-Jaeggli B, Bouteillé-Pallas M, Tai S, Cruickshank A, Jordan D, Mace E. Genetic Diversity of C4 Photosynthesis Pathway Genes in Sorghum bicolor (L.). Genes. 2020; 11(7):806. https://doi.org/10.3390/genes11070806

Chicago/Turabian Style

Tao, Yongfu; George-Jaeggli, Barbara; Bouteillé-Pallas, Marie; Tai, Shuaishuai; Cruickshank, Alan; Jordan, David; Mace, Emma. 2020. "Genetic Diversity of C4 Photosynthesis Pathway Genes in Sorghum bicolor (L.)" Genes 11, no. 7: 806. https://doi.org/10.3390/genes11070806

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