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Abstract
We investigated the proteomic profiles of two popcorn inbred lines, P2 (N-efficient and N-responsive) and L80 (N-inefficient and nonresponsive to N), under low (10% of N supply) and high (100% of N supply) nitrogen environments, associated with agronomic- and physiological-related traits to NUE. The comparative proteomic analysis allowed the identification of 79 differentially accumulated proteins (DAPs) in the comparison of high/low N for P2 and 96 DAPs in the comparison of high/low N for L80. The NUE and N uptake efficiency (NUpE) presented high means in P2 in comparison to L80 at both N levels, but the NUE, NUpE, and N utilization efficiency (NUtE) rates decreased in P2 under a high N supply. DAPs involved in energy and carbohydrate metabolism suggested that N regulates enzymes of alternative pathways to adapt to energy shortages and that fructose-bisphosphate aldolase may act as one of the key primary nitrate responsive proteins in P2. Proteins related to ascorbate biosynthesis and nitrogen metabolism increased their regulation in P2, and the interaction of l-ascorbate peroxidase and Fd-NiR may play an important role in the NUE trait. Taken together, our results provide new insights into the proteomic changes taking place in contrasting inbred lines, providing useful information on the genetic improvement of NUE in popcorn.
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1 Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Rio de Janeiro, Brazil (GRID:grid.412331.6) (ISNI:0000 0000 9087 6639)
2 Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), Laboratório de Biotecnologia, Centro de Biociências e Biotecnologia, Rio de Janeiro, Brazil (GRID:grid.412331.6) (ISNI:0000 0000 9087 6639); Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), Unidade de Biologia Integrativa, Setor de Genômica e Proteômica. Centro de Biociências e Biotecnologia, Rio de Janeiro, Brazil (GRID:grid.412331.6) (ISNI:0000 0000 9087 6639)
3 Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), Laboratório de Fitotecnia-Setor de Nutrição Mineral de Plantas, Centro de Ciências e Tecnologias Agropecuárias, Rio de Janeiro, Brazil (GRID:grid.412331.6) (ISNI:0000 0000 9087 6639)
4 Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), Laboratório de Melhoramento Genético Vegetal-Setor de Fisiologia Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Rio de Janeiro, Brazil (GRID:grid.412331.6) (ISNI:0000 0000 9087 6639)
5 Universidade Federal do Espírito Santo (UFES), Departamento de Engenharia Rural, Centro de Ciências Agrárias, Alegre, Brazil (GRID:grid.412371.2) (ISNI:0000 0001 2167 4168)
6 Universidad de Talca, Instituto de Ciencias Biológicas, Talca, Chile (GRID:grid.10999.38) (ISNI:0000 0001 0036 2536)