Potential of S1 popcorn progenies for the synthesis of top-cross hybrids aiming grain yield, popping expansion and resistance to foliar diseases

• Grant number: 14/17604-9
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: November 01, 2014
• End date: March 31, 2018
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Maria Elisa Ayres Guidetti Zagatto Paterniani
• Grantee: André Luís Bombonato de Oliveira
• Host Institution: Instituto Agronômico (IAC). Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brazil

Abstract

Popcorn breeders mainly aims the development of lines that presents better performance in hybrids combinations. In this focus, identifying promising hybrids and estimating genetic parameters allows to orientate the procedures for greatest selection gain. The objects of this work are: to develop and evaluate popcorn top-crosses hybrids for main traits as grain yield, popping expansion and resistance to foliar diseases (northern leaf blight, gray leaf spot and leaf rust); to estimate general and specific combining abilities of top crosses hybrids of popcorn for main traits as grain yield, popping expansion and resistance to foliar diseases (northern leaf blight, gray leaf spot and rust); to estimate general and specific combining abilities of S1crosses between progenies and testers; to estimate phenotypic and genotypic correlations for agronomic traits and popcorn quality. The experiments will be conducted in the crop years 2015/2016, in Mococa and Capão Bonito, under lattice design with two replications. 400 top crosses hybrids derived from crosses between S1 progeny of population IAC 8383 with two testers IAC12 and B6102 will be evaluated, aiming agronomic traits: plant and ear height, lodging and broken plants, ears of thatch, grain weight, hectoliters weight, 100 grains weight, popping expansion and severity of foliar diseases. Individual and combined analysis of variance will be carried considering the fixed model. The estimates of general and specific combining abilities and phenotypic and genotypic correlations will be performed supported by the statistical program Genes. (AU)