Close Relationship between Mexican and Chinese Magnolia (Subtropical Disjunct of Magnoliaceae) Inferred from Molecular and Floral Scent Analyses

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概要

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• The floral scents of Magnolia coco (distributed in Asia) and M. mexicana (New World), plus two Mexican Magnolia taxa, M. schiedeana and M. dealbata, were analyzed using GC-MS. A molecular phylogenetic analysis was also conducted using a combined data set of plastid DNA sequences obtained from GenBank to construct a well-resolved phylogenetic tree. The analysis indicated a sister relationship between subtropical-tropical Asian and American disjunct groups (including M. coco and M. mexicana) which was not shown in previous studies. Entire flowers and floral parts (sepals, petals, and gynoecia) of M. coco emitted methyl 2-methylbutanoate (83-96%), whereas entire flowers of M mexicana emitted α-farnesene (67%) which was mainly emitted from the sepals. The petals and gynoecium of M. mexicana emitted methyl 2-methylbutanoate as the main component with relatively small amount of α-farnesene. The common presence of methyl 2-methylbutanoate in the petals and gynoecium of both taxa may represent an ancestral scent profile because subtropical-tropical disjunct groups, which include M. coco in one and M. mexicana in the other, phylogenetically show a sister relationship. The floral scent of M. schiedeana was exclusively composed of monoterpenes, especially geranyl methyl ether (87%). The floral scent of M. dealbata was predominantly composed of benzenoids, especially 2-phenylethanol (78%) and methyl phenylacetate (13%).

• 日本植物分類学会の論文
• 2004-12-10

著者

• AZUMA HIROSHI

  Department of Botany, Graduate School of Science, Kyoto University

• ASAKAWA Yoshinori

  Faculty of Pharmaceutical Sciences, Tokushima Bunri University

• Rico-gray Victor

  Departamento De Ecologeia Vegetal Instituto De Ecologia A. C.

• Thien Leonard

  Department Of Cell And Molecular Biology Tulane University

• Asakawa Y

  Fac. Of Pharmaceutical Sciences Tokushima Bunri Univ.

• Azuma H

  Kyoto Univ. Kyoto Jpn

• TOYOTA MASAO

  Faculty of Pharmaceutical Science, Tokushima Bunri University

• GARCIA-FRANCO JOSE

  Departamento de Ecologeia Vegetal, Instituto de Ecologia, A. C.

• Toyota M

  Tokushima Bunri Univ. Tokushima Jpn

• Toyota Masao

  Faculty Of Pharmaceutical Sciences Tokushima Bunri University

• Thien Leonard

  Tulane Univ. Usa

• Garcia-franco Jose

  Departamento De Ecologeia Vegetal Instituto De Ecologia A. C.

• Asakawa Y

  Tokushima Bunri Univ. Tokushima Jpn

• Asakawa Yoshinori

  Faculty Of Pharmaceutical Sciences Tokushima Bunri University

• Azuma Hiroshi

  Department Of Biosystem Regulation Institute Of Biomaterials And Bioengineering

• Garciafranco Jose

  Departamento De Ecologeia Vegetal Instituto De Ecologia A. C.

• Garcia-franco Jose

  Departamento De Ecoloaia Vegetal. Instituto De Ecologia

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