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タイトル: | Coexistence of trichome variation in a natural plant population: a combined study using ecological and candidate gene approaches. |
著者: | Kawagoe, Tetsuhiro Shimizu, Kentaro K Kakutani, Tetsuji Kudoh, Hiroshi ![]() ![]() ![]() |
著者名の別形: | 川越, 哲博 |
発行日: | Jul-2011 |
出版者: | Public Library of Science |
誌名: | PloS one |
巻: | 6 |
号: | 7 |
論文番号: | e22184 |
抄録: | The coexistence of distinct phenotypes within populations has long been investigated in evolutionary ecology. Recent studies have identified the genetic basis of distinct phenotypes, but it is poorly understood how the variation in candidate loci is maintained in natural environments. In this study, we examined fitness consequences and genetic basis of variation in trichome production in a natural population of Arabidopsis halleri subsp. gemmifera. Half of the individuals in the study population produced trichomes while the other half were glabrous, and the leaf beetle Phaedon brassicae imposed intensive damage to both phenotypes. The fitness of hairy and glabrous plants showed no significant differences in the field during two years. A similar result was obtained when sibling hairy and glabrous plants were transplanted at the same field site, whereas a fitness cost of trichome production was detected under a weak herbivory condition. Thus, equivalent fitness of hairy and glabrous plants under natural herbivory allows their coexistence in the contemporary population. The pattern of polymorphism of the candidate trichome gene GLABROUS1 (GL1) showed no evidence of long-term maintenance of trichome variation within the population. Although balancing selection under fluctuating biotic environments is often proposed to explain the maintenance of defense variation, the lack of clear evidence of balancing selection in the study population suggests that other factors such as gene flow and neutral process may have played relatively large roles in shaping trichome variation at least for the single population level. |
著作権等: | © 2011 Kawagoe et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
URI: | http://hdl.handle.net/2433/145521 |
DOI(出版社版): | 10.1371/journal.pone.0022184 |
PubMed ID: | 21811571 |
出現コレクション: | 学術雑誌掲載論文等 |
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