| Autor: |
B. Boller, C. Grieder, F. X. Schubiger |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
Breeding in a World of Scarcity ISBN: 9783319289304 |
| DOI: |
10.1007/978-3-319-28932-8_2 |
| Popis: |
When building synthetic varieties by crossing a fixed number of elite genotypes in a polycross, breeders are faced with a tradeoff between selection intensity and inbreeding depression. We investigated the relationship between synthetic size and herbage dry matter (DM) yield by analyzing replicated field data of 93 diploid and 73 tetraploid perennial ryegrass (Lolium perenne L.) synthetics of the Agroscope breeding program. In line with theoretical expectations, DM yield of diploid synthetics declined when the number of parents dropped below seven. However, no such decline was observed with tetraploid synthetics. We conclude that in tetraploid perennial ryegrass, selection intensity can be increased to result in synthetics with only five parents without hampering DM yield. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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