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テラチ トオル
TERACHI TORU
寺地 徹 所属 京都産業大学 生命科学部 産業生命科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2009/10 |
| 形態種別 | その他 |
| 標題 | Relative fitness of females and hermaphrodites in a natural gynodioecious population of wild radish, Raphanus sativus L. (Brassicaceae): comparison based on molecular genotyping |
| 執筆形態 | その他 |
| 掲載誌名 | JOURNAL OF EVOLUTIONARY BIOLOGY |
| 出版社・発行元 | WILEY-BLACKWELL PUBLISHING, INC |
| 巻・号・頁 | 22(10),pp.2012-2019 |
| 著者・共著者 | K. Miyake,T. Miyake,T. Terachi,T. Yahara |
| 概要 | In many gynodioecious species, sex determination involves both cytoplasmic male-sterility (CMS) genes and nuclear genes that restore male function. Differences in fitness among genotypes affect the dynamics of those genes, and thus that of gynodioecy. We used a molecular marker to discriminate between hermaphrodites with and without a CMS gene in gynodioecious Raphanus sativus. We compared fitness through female function among the three genotypes: females, hermaphrodites with the CMS gene and those without it. Although there was no significant difference among the genotypes in seed size, hermaphrodites without the CMS gene produced significantly more seeds, and seeds with a higher germination rate than the other genotypes, suggesting no fitness advantage for females and no benefit to bearing the CMS gene. Despite the lack of fitness advantage for females in the parameter values we estimated, a theoretical model of gynodioecy shows it can be maintained if restorer genes impose a cost paid in pollen production. In addition, we found that females invest more resources into female reproduction than hermaphrodites when they become larger. If environmental conditions enable females to grow larger this would facilitate the dynamics of CMS genes. |
| DOI | 10.1111/j.1420-9101.2009.01808.x |
| ISSN | 1010-061X |