Leaves of C4 crops usually have higher radiation, water and nitrogen use efficiencies compared to the C3 species. Engineering C4 traits into C3 crops has been proposed as one of the most promising ways to repeal the biomass yield ceiling. To better understand the function of C4 photosynthesis, and to identify candidate genes that are associated with the C4 pathways, a comparative transcription network analysis was conducted on leaf developmental gradients of three C4 species including maize, green foxtail and sorghum and one C3 species, rice. By combining the methods of gene co-expression and differentially co-expression networks, we identified a total of 128 C4 specific genes. Besides the classic C4 shuttle genes, a new set of genes associated with light reaction, starch and sucrose metabolism, metabolites transportation, as well as transcription regulation, were identified as involved in C4 photosynthesis. These findings will provide important insights into the differential gene regulation between C3 and C4 species, and a good genetic resource for establishing C4 pathways in C3 crops.

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radiation water and nitrogen use efficiencies biomass differential gene regulation comparative transcription network analysis c4 photosynthesis traits light reaction starch and sucrose metabolism metabolites leaf developmental gradients crops c4 specific genes differentially coexpression networks

Lin WANG,Lei Huang,Minghui Wang,Qi Sun,Xiaoyu Tu,Silin Zhong,Zehong Ding,Sarit Weissmann,Baijuan Du,Christopher Myers,Thomas P Brutnell,Pinghua Li,.Identification of Photosynthesis-Associated C4 Candidate Genes through Comparative Leaf Gradient Transcriptome in Multiple Lineages of C3 and C4 Species.. 10 (10),.

Lin WANG,Lei Huang,Minghui Wang,Qi Sun,Xiaoyu Tu,Silin Zhong,Zehong Ding,Sarit Weissmann,Baijuan Du,Christopher Myers,Thomas P Brutnell,Pinghua Li,"Identification of Photosynthesis-Associated C4 Candidate Genes through Comparative Leaf Gradient Transcriptome in Multiple Lineages of C3 and C4 Species." 10

Lin WANG,Lei Huang,Minghui Wang,Qi Sun,Xiaoyu Tu,Silin Zhong,Zehong Ding,Sarit Weissmann,Baijuan Du,Christopher Myers,Thomas P Brutnell,Pinghua Li,"Identification of Photosynthesis-Associated C4 Candidate Genes through Comparative Leaf Gradient Transcriptome in Multiple Lineages of C3 and C4 Species."