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BioEnergy Research : Volume 2

BioEnergy Research : Volume 1

Changes in Mean and Genetic Variance During Two Cycles of Within-family Selection in Switchgrass

Content Provider	Springer Nature Link
Author	Casler, Michael D.
Copyright Year	2010
Abstract	Switchgrass (Panicum virgatum L.) is a candidate for cellulosic bioenergy feedstock development. Because biomass yield is the most important biological factor limiting the commercial development and deployment of switchgrass as a cellulosic bioenergy feedstock efforts must be undertaken to develop improved cultivars. The objectives of this study were (1) to conduct two cycles of within-family selection for increased biomass yield in WS4U switchgrass and (2) to simultaneously evaluate progress from selection relative to the mean of the original WS4U population. Each of the 150 WS4U families was subjected to phenotypic selection for vigor, seed production, and disease resistance. The mean of all families increased relative to the original WS4U population by 0.36 Mg ha$^{−1}$ cycle$^{−1}$ for biomass yield and 3.0% cycle$^{−1}$ for ground cover. Gains were uniform across two diverse evaluation locations, indicating that selection gains were robust relative to some variation in Hardiness Zone and soil type. Two cycles of within-family selection led to a homogenization of the diverse families, creating novel recombinations and reducing the family genetic variance to near zero. It is hypothesized that selection and recombination has led to replication of favorable alleles across pedigrees with differing genetic backgrounds, increasing the likelihood of including these favorable alleles in the progeny of future selections. The rate of genetic progress is expected to increase in future cycles of selection with a combination of within-family phenotypic selection and half-sib progeny testing of selected families.
Starting Page	47
Ending Page	54
Page Count	8
File Format	PDF
ISSN	19391234
Journal	BioEnergy Research
Volume Number	3
Issue Number	1
e-ISSN	19391242
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-01-28
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Panicum virgatum L Biomass yield Breeding Biofuel crops Wood Science & Technology Plant Ecology Plant Breeding/Biotechnology Plant Genetics & Genomics Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment Agronomy and Crop Science

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