Title |
Genome-Wide Association of Carbon and Nitrogen Metabolism in the Maize Nested Association Mapping Population
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Published in |
Plant Physiology, April 2015
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DOI | 10.1104/pp.15.00025 |
Pubmed ID | |
Authors |
Nengyi Zhang, Yves Gibon, Jason G. Wallace, Nicholas Lepak, Pinghua Li, Lauren Dedow, Charles Chen, Yoon-Sup So, Karl Kremling, Peter J. Bradbury, Thomas Brutnell, Mark Stitt, Edward S. Buckler |
Abstract |
Carbon (C) and nitrogen (N) metabolism are critical to plant growth and development and are at the basis of crop yield and adaptation. We performed high-throughput metabolite analyses on over 12,000 samples from the maize Nested Association Mapping population to identify genetic variation in C and N metabolism in maize (Zea mays subsp. mays). All samples were grown in the same field and used to identify natural variation controlling the levels of twelve key C and N metabolites, namely chlorophyll a, chlorophyll b, fructose, fumarate, glucose, glutamate, malate, nitrate, starch, sucrose, total amino acids, and total protein, along with the first two principal components derived from them. Our GWAS results frequently identified hits with single-gene resolution. In addition to expected genes such as invertases, natural variation was identified in key C4 metabolism genes including carbonic anhydrases and a malate transporter. Unlike several prior maize studies, extensive pleiotropy was found for C and N metabolites. This integration of field-derived metabolite data with powerful mapping and genomics resources allows for dissection of key metabolic pathways, providing avenues for future genetic improvement. |
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