Inheritance of Cold Temperature Emergence in Soybeans and Its Relationship to Field Emergence and Seed Yield of Early Planted Soybeans (Heritability, Genetic, Vigor)

62 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984.Increasing use of reduced-tillage techniques, earlier planting, and late cold snaps can result in the exposure of emerging soybeans to suboptimal soil temperatures. Such exposure can result in decreased emergence, reduced seedling vigor, increased incidence of disease, and lowered yields. Soybean genotypes with superior cold temperature emergence (CTE) ability will avoid these problems.This study was conducted to determine the relationships of CTE ratings to field performance and seed yield of early-planted soybeans, and to quantify the inheritance of CTE.Seventeen adapted genotypes were screened for CTE in the laboratory for three years, and in the field for two years. Field performance of early-planted soybeans was related to CTE ability within years. Large seed source effects were observed.Significant genotypic variation for CTE was found among the F(,4) progeny of four soybean populations. Heritability estimates for CTE averaged 75%.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD