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Auteur Lena Ghatnekar |
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Titre : Apomixis and sexuality in hexaploid Potentilla argentea Type de document : Imprimé Auteurs : Svante Holm ; Lena Ghatnekar Année de publication : 1996 Article en page(s) : 53-60 Langues : Anglais (eng) Mots-clés : Potentilla sp. Résumé : Hexaploid Potentilla argentea L. (s.l.) plants from twelve populations in southern Sweden were investigated with RAPD to determine the pattern of genetic variability. The ploidy level of the plants was ascertained by flow cytometry. Thirteen different RAPD band patterns (genotypes) were found among 64 plants investigated. Nine of the populations had unique band patterns, two populations shared the same, and in one population three different patterns were found among three plants. Also a small isozyme investigation detected genetic variability, again distributed primarily between populations. Analyses with RAPD of offspring derived from bagged flower-stalks and from artificial crosses between different hexaploid genotypes, showed that seeds are normally produced by apomixis. However, one hybrid offspring with a nonoploid (9x) ploidy level was found, proving that pollen produced by hexaploid P. argentea is capable of fertilization, and that sexually derived seeds can develop and mature on hexaploid plants. The broad genetic variability found in the RAPD and isozyme investigations indicates that gamete production after reduction division may also occur on the female side, though at a low frequency. Judging from its isozyme patterns, hexaploid P. argentea is an allopolyploid having diploid P. argentea as one of its parents. Lien pérenne : DOI : 10.1111/j.1601-5223.1996.00053.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137861
in Hereditas > 125 (1) (1996) . - 53-60Holm, Svante, Ghatnekar, Lena 1996 Apomixis and sexuality in hexaploid Potentilla argentea. Hereditas, 125(1): 53-60.Documents numériques
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Article (1996)URLSexuality and no apomixis found in crossing experiments with diploid Potentilla argentea / Svante Holm in Hereditas, 125 (1) (1996)
Titre : Sexuality and no apomixis found in crossing experiments with diploid Potentilla argentea Type de document : Imprimé Auteurs : Svante Holm ; Lena Ghatnekar Année de publication : 1996 Article en page(s) : 77-82 Langues : Anglais (eng) Mots-clés : Potentilla sp. Résumé : Thirty-six crosses between plants of the putative facultative apomictic diploid Pofentilkz argentea L. (s.l.) from southern Sweden led to the production of hybrid offspring, as determined by isozyme analysis. Forty-three crosses with diploid P. argentea as mother plants and hexaploid P. argenrea L. (s. l.) or hexaploid P. collina Wib. as pollen donors resulted in normal-looking seeds but with no, or only low, rates of germination. Among the few offspring obtained, two were found to be tetraploid as determined by Row cytometry. Offspring plants with non-hybrid genotypes were occasionally obtained in the crosses, which in all cases could be explained as being due to selfing resulting from incomplete emasculations or unwanted insect pollinations. We conclude that, on the basis of currently available information, diploid Potentilla argentea is not a facultative apomict. Lien pérenne : DOI : 10.1111/j.1601-5223.1996.00077.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137860
in Hereditas > 125 (1) (1996) . - 77-82Holm, Svante, Ghatnekar, Lena 1996 Sexuality and no apomixis found in crossing experiments with diploid Potentilla argentea. Hereditas, 125(1): 77-82.Documents numériques
Article (1996)URL
