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ARS Home » Midwest Area » Ames, Iowa » Corn Insects and Crop Genetics Research » Research » Research Project #425213

Research Project: Innovative Genetic Approaches for Improving Maize Germplasm for Product Quality and Adaption to Diverse Production Systems

Location: Corn Insects and Crop Genetics Research

Project Number: 5030-21000-063-000-D
Project Type: In-House Appropriated

Start Date: May 13, 2013
End Date: Mar 6, 2018

Objective 1: Develop and apply practical genetic methods for determining the capacity of genomic selection to identify maize genotypes with superior yield and optimal grain quality for diverse end uses. Objective 2: Devise, apply, and validate novel, more effective approaches for predicting genotype by environment interactions in genetically diverse maize hybrids cultivated under different production systems. Objective 3: Identify and characterize the key genetic, physiological, and/or developmental traits that enable diverse maize germplasm to yield optimally under high planting densities and/or reduced inputs. Objective 4: Develop strategies for deploying gametophytic incompatibility genes to control undesired outcrossing among corn market classes. Subobjective 4.1: Introgression of gametic incompatibility loci into inbred lines. Subobjective 4.2: Determine the effect of gametophytic incompatibility alleles and genetic backgrounds on pollen exclusion.

Objective 1: We propose to carry out genomic selection in two maize populations. Breeding will be carried out using a modified Ear to row recurrent program, in which selection is based on models of phenotypic performance developed from genotypic and phenotypic data. Objective 2: Data from previous experiments will be combined and supplemented with new complementary data from replicated field trials grown at different plant densities. These data will allow us to determine plant density response. The relationship between plant density response and genotype by environment interactions will be characterized. Objective 3: Replicated field trials will be carried out different plant densities. Agronomic and morphological traits of the plants will be examined. Relationships between plant density and phenotypic traits will be determined. Objective 4: We will backcross gametophytic incompatibility loci into inbred lines and evaluate the ability of the resulting lines to exclude pollen. We will determine the stability of the pollen exclusion trait across different genetic backgrounds.