Articles
Risks and rewards of enhanced germplasm collections: a case study of the arctic daisy species complex
Article number
1467_2
Pages
7 – 20
Language
English
Abstract
Wide germplasm bases provide breeding programs with a continuing array of phenotypic, chemotypic, and genotypic variation enabling enhancement of new and existing crops regardless of their propagation mode (sexual, asexual). Many ornamental (floriculture, nursery, bedding plant, woody shrub/tree) crops are based on extremely narrow germplasm which limits the ability to elicit change necessitated by markets, disease and pest pressures, abiotic changes, and/or Muller’s ratchet.
Mechanisms for germplasm acquisition are available for expansive collection although numerous factors limit global explorations.
To enhance the chrysanthemum gene bank the University of Minnesota breeding program has focused on extensive collection of the Arctic daisy (Chrysanthemum arcticum L.) trifecta species complex throughout North America.
Phenomic, genomic and ionomic analyses have provided the basis for directionality of breeding and selection efforts to enhance the abiotic stress traits inherent in this complex, providing new options for salt tolerance, winter hardiness, and photoperiodism that do not exist in the current ornamental (C. × grandiflorum Tzvelv.) and green pesticide (C. cinerariifolium, C. coccineum) chrysanthemum crops.
Decision-making for long-term germplasm maintenance in clonal repositories and associated risks remain critical issues which will be addressed within the risk/reward framework.
Mechanisms for germplasm acquisition are available for expansive collection although numerous factors limit global explorations.
To enhance the chrysanthemum gene bank the University of Minnesota breeding program has focused on extensive collection of the Arctic daisy (Chrysanthemum arcticum L.) trifecta species complex throughout North America.
Phenomic, genomic and ionomic analyses have provided the basis for directionality of breeding and selection efforts to enhance the abiotic stress traits inherent in this complex, providing new options for salt tolerance, winter hardiness, and photoperiodism that do not exist in the current ornamental (C. × grandiflorum Tzvelv.) and green pesticide (C. cinerariifolium, C. coccineum) chrysanthemum crops.
Decision-making for long-term germplasm maintenance in clonal repositories and associated risks remain critical issues which will be addressed within the risk/reward framework.
Authors
N.O. Anderson
Keywords
germplasm, genetic diversity, genetic resources, phenotypic diversity, salt tolerance
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