Genetic Diversity of Genes Controlling Unilateral Incompatibility in Japanese Cultivars of Chinese Cabbage
In recent years, unilateral incompatibility (UI), which is an incompatibility system for recognizing and rejecting foreign pollen that operates in one direction, has been shown to be closely related to self-incompatibility (SI) in <i>Brassica rapa</i>. The stigma- and pollen-side recogni...
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| Autores principales: | , , , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/caac51d1c1f54ab38a21779da3c17846 |
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| Sumario: | In recent years, unilateral incompatibility (UI), which is an incompatibility system for recognizing and rejecting foreign pollen that operates in one direction, has been shown to be closely related to self-incompatibility (SI) in <i>Brassica rapa</i>. The stigma- and pollen-side recognition factors (<i>SUI1</i> and <i>PUI1</i>, respectively) of this UI are similar to those of SI (stigma-side <i>SRK</i> and pollen-side <i>SP11</i>), indicating that <i>SUI1</i> and <i>PUI1</i> interact with each other and cause pollen-pistil incompatibility only when a specific genotype is pollinated. To clarify the genetic diversity of <i>SUI1</i> and <i>PUI1</i> in Japanese <i>B. rapa</i>, here we investigated the UI phenotype and the <i>SUI1</i>/<i>PUI1</i> sequences in Japanese commercial varieties of Chinese cabbage. The present study showed that multiple copies of nonfunctional <i>PUI1</i> were located within and in the vicinity of the <i>UI</i> locus region, and that the functional <i>SUI1</i> was highly conserved in Chinese cabbage. In addition, we found a novel nonfunctional <i>SUI1</i> allele with a dominant negative effect on the functional <i>SUI1</i> allele in the heterozygote. |
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