Incompatibility classes and fruit set in natural populations of arctic bramble (Rubus arcticus L.) in Finland
In Finnish natural populations, arctic bramble proved uniformly self-incompatible. In vigorous and richly flowering populations, the intensity of fruit set is governed by the number of incompatibility classes present. Most non-fruiting populations contain only one incompatibility class (and most lik...
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| Format: | Article |
| Language: | English |
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Scientific Agricultural Society of Finland
1988-08-01
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| Series: | Agricultural and Food Science |
| Online Access: | https://journal.fi/afs/article/view/72299 |
| _version_ | 1819236115539820544 |
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| author | Jussi Tammisola |
| author_facet | Jussi Tammisola |
| author_sort | Jussi Tammisola |
| collection | DOAJ |
| description | In Finnish natural populations, arctic bramble proved uniformly self-incompatible. In vigorous and richly flowering populations, the intensity of fruit set is governed by the number of incompatibility classes present. Most non-fruiting populations contain only one incompatibility class (and most likely only one clone) and therefore totally lack compatible pollen. Richly fruiting populations usually contain at least three incompatibility classes. A clone with an estimated size of 80 metres and age of 160 years was found. This supports the vegetative burst explanation for the “sudden appearance” of arctic bramble populations. For the purposes of plant breeding, a large genetic collection is required. In cultivation, a thorough mixture of at least three varieties is recommended. The study was dynamically optimized. A computerized guidance system was constructed, which analyzed the accumulating results and yielded recommendations for forthcoming crosses. For the analysis into equivalence classes of incompatibility, a stepwise clustering algorithm of the single move type, based on the maximum likelihood principle, was introduced. This partitioning was based on the number of seeds in a cross, considering it as a stochastic variable. Seed number probability distributions in intraclass and interclass pollinations were acquired utilizing non-parametric density estimation. Finally, both incompatibility class and seed probability estimates were adjusted together iteratively. A recommendation algorithm was produced, based on a partially heuristic principle of maximum lability maximum stability. With the aid of the guidance system, incompatibility classes could be resolved using about one tenth of the number of crosses required in a conventional system. |
| first_indexed | 2024-12-23T12:59:18Z |
| format | Article |
| id | doaj.art-8ad9cd74e5de4c59bdba6cdba4f6291a |
| institution | Directory Open Access Journal |
| issn | 1459-6067 1795-1895 |
| language | English |
| last_indexed | 2024-12-23T12:59:18Z |
| publishDate | 1988-08-01 |
| publisher | Scientific Agricultural Society of Finland |
| record_format | Article |
| series | Agricultural and Food Science |
| spelling | doaj.art-8ad9cd74e5de4c59bdba6cdba4f6291a2022-12-21T17:46:04ZengScientific Agricultural Society of FinlandAgricultural and Food Science1459-60671795-18951988-08-01605Incompatibility classes and fruit set in natural populations of arctic bramble (Rubus arcticus L.) in FinlandJussi Tammisola0Department of Plant Breeding, University of Helsinki SF-00710 Helsinki, FinlandIn Finnish natural populations, arctic bramble proved uniformly self-incompatible. In vigorous and richly flowering populations, the intensity of fruit set is governed by the number of incompatibility classes present. Most non-fruiting populations contain only one incompatibility class (and most likely only one clone) and therefore totally lack compatible pollen. Richly fruiting populations usually contain at least three incompatibility classes. A clone with an estimated size of 80 metres and age of 160 years was found. This supports the vegetative burst explanation for the “sudden appearance” of arctic bramble populations. For the purposes of plant breeding, a large genetic collection is required. In cultivation, a thorough mixture of at least three varieties is recommended. The study was dynamically optimized. A computerized guidance system was constructed, which analyzed the accumulating results and yielded recommendations for forthcoming crosses. For the analysis into equivalence classes of incompatibility, a stepwise clustering algorithm of the single move type, based on the maximum likelihood principle, was introduced. This partitioning was based on the number of seeds in a cross, considering it as a stochastic variable. Seed number probability distributions in intraclass and interclass pollinations were acquired utilizing non-parametric density estimation. Finally, both incompatibility class and seed probability estimates were adjusted together iteratively. A recommendation algorithm was produced, based on a partially heuristic principle of maximum lability maximum stability. With the aid of the guidance system, incompatibility classes could be resolved using about one tenth of the number of crosses required in a conventional system.https://journal.fi/afs/article/view/72299 |
| spellingShingle | Jussi Tammisola Incompatibility classes and fruit set in natural populations of arctic bramble (Rubus arcticus L.) in Finland Agricultural and Food Science |
| title | Incompatibility classes and fruit set in natural populations of arctic bramble (Rubus arcticus L.) in Finland |
| title_full | Incompatibility classes and fruit set in natural populations of arctic bramble (Rubus arcticus L.) in Finland |
| title_fullStr | Incompatibility classes and fruit set in natural populations of arctic bramble (Rubus arcticus L.) in Finland |
| title_full_unstemmed | Incompatibility classes and fruit set in natural populations of arctic bramble (Rubus arcticus L.) in Finland |
| title_short | Incompatibility classes and fruit set in natural populations of arctic bramble (Rubus arcticus L.) in Finland |
| title_sort | incompatibility classes and fruit set in natural populations of arctic bramble rubus arcticus l in finland |
| url | https://journal.fi/afs/article/view/72299 |
| work_keys_str_mv | AT jussitammisola incompatibilityclassesandfruitsetinnaturalpopulationsofarcticbramblerubusarcticuslinfinland |