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An Examination of Genetic Improvement to Floret Number and Morphology of Maize (Zea mays L.)

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Title: An Examination of Genetic Improvement to Floret Number and Morphology of Maize (Zea mays L.)
Author: MacKenzie, John O.
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Lee, Dr. Elizabeth
Abstract: Plant density tolerance is primarily responsible for the grain yield (GY) improvement achieved during the hybrid era. Studies have not provided evidence for plant growth or resource availability as sole factors responsible for density tolerance. It is hypothesized that the genetic improvement of increased density tolerance is due to changes in floret development, notably improved floret morphology under increasing plant densities. Using three plant densities, potential and actual GY was evaluated in five Ontario ERA hybrids at one location for two years. The effects of plant density were more noticeable for kernel traits than for floret traits. Plant density did not have a strong influence on the morphology or the number of florets per ear initial. There is no evidence for genetic improvement to the number of florets or their respective morphology. These results contrast with reports of genetic improvement to source components of maize during the time period examined.
URI: http://hdl.handle.net/10214/8769
Date: 2015-04-27


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