Measurements of lethal and nonlethal inbreeding depression inform the de novo domestication of Silphium integrifolium
| Autor: | Yaniv Brandvain, John H. Price, Kevin P. Smith |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Conservation genetics education.field_of_study Inbreeding Depression biology Population Zoology Plant Science Asteraceae biology.organism_classification 010603 evolutionary biology 01 natural sciences Genetic load Domestication Plant Breeding Silphium integrifolium Effective population size Genetics Inbreeding depression Inbreeding education Ecology Evolution Behavior and Systematics 010606 plant biology & botany |
| Zdroj: | American journal of botanyLITERATURE CITED. 108(6) |
| ISSN: | 1537-2197 |
| Popis: | PREMISE Inbreeding depression, or the reduction in fitness of progeny with related parents, has the potential to adversely affect the long-term viability of both wild and captive plant populations. Silphium integrifolium, a prairie plant native to the central United States, has been identified as a potential candidate for domestication as a perennial oilseed crop. Little is known about the potential for inbreeding depression in this species, but it is expected to be nonnegligible because S. integrifolium is both perennial and self-incompatible. Here, we measure lethal inbreeding depression expressed through embryo deaths, and nonlethal inbreeding depression expressed through changes in vigor and fitness phenotypes of progeny. METHODS First, we made controlled crosses among related and unrelated individuals to determine the effect of two different levels of inbreeding on seed production. Then, we grew inbred and outbred progeny from this population to reproductive maturity and measured 11 key traits. RESULTS We found that within an improved S. integrifolium population, individuals carried an average of slightly less than one lethal allele per gamete. In progeny, significant inbreeding depression was observed in at least one family for eight of the 11 measured traits. CONCLUSIONS Inbreeding depression is likely to be an important challenge to S. integrifolium domestication, reducing overall population fecundity and values for important phenotypes. These effects may grow worse as selection reduces effective population size. We recommend several strategies for S. integrifolium breeding to help mitigate these problems. |
| Databáze: | OpenAIRE |
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