| Autor: |
Van Damme, J. M. M., Hundscheid, M. P. J., Ivanovic, S., Koelewijn, H. P. |
| Předmět: |
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| Zdroj: |
Heredity; Aug2004, Vol. 93 Issue 2, p175-185, 7p, 6 Charts |
| Abstrakt: |
The mode of inheritance of the male sterility trait is crucial for understanding the evolutionary dynamics of the sexual system gynodioecy, which is the co-occurrence of female and hermaphrodite plants in natural populations. Both cytoplasmic (CMS) and nuclear (restorer) genes are known to be involved. Theoretical models usually assume a limited number of CMS genes with each a single restorer gene, while reality is more complex. In this study, it is shown that in the gynodioecious species Plantago coronopus two new CMS-restorer polymorphisms exist in addition to the two that were already known, which means four CMS-restorer systems at the species level. Furthermore, three CMS types were shown to co-occur within a single population. All new CMS types showed a multilocus system for male fertility restoration, in which both recessive and dominant restorer alleles occur. Our finding of more than two co-occurring CMS-restorer systems each with multiple restorer genes raises the question how this complex of male sterility systems is maintained in natural populations.Heredity (2004) 93, 175-181, advance online publication, 12 May 2004; doi:10.1038/sj.hdy.6800490 [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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