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Phenotypic structures and breeding value of open-pollinated corn varietal hybrids

Abstract::
The growing interest in using open-pollinated varieties (OPVs) and varietal hybrids (OPVhs) of corn (Zea mays L.) reflects the value of large plasticity levels available in their plant, ear, and kernel traits. We estimated variation, broad sense heritability, general and specific combining ability, and pairwise phenotypic distances based on 35 traits measured on 46 OPVhs grown under four environments. Average grain yield across environments was inversely related to its variance; we identified OPVhs with large grain yield and small variance along with the traits contributing to this large and stable grain yield. Estimates of heritability ranged from 0.35 to 0.85, with decreasing average values for kernel, ear, and plant traits. Effects of general combining ability and its interaction with the environment for most traits were more important than specific combining ability effects. Largest grain yield and specific combining ability effects resulted from crosses among OPVs of different source germplasm origin. Pairwise phenotypic distances among OPVhs indicate the presence of “functional” OPVh groups based on multiple traits and their interaction with the environment.
Author(s):
Jaradat, Abdullah A. , Goldstein, Walter , Dashiell, Kenton
Subject(s):
Zea mays , corn , hybrids , varieties , breeding value , phenotypic plasticity , phenotypic variation , heritability , open pollination , grain yield , agronomic traits
Description:
Includes references
Source:
International journal of plant breeding 2010, v. 4, no. 1
Language:
English
Year:
2010
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF]   
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.