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Leaflet secretory structures of five taxa of the genus Zornia J.F. Gmel. (Leguminosae, Papilionoideae, Dalbergieae) and their systematic significance

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Abstract

A survey of the secretory structures of leaflets has been carried out for five taxa of the genus Zornia J.F. Gmel. to assess possible taxonomic value of the glands, taking into account that these taxa, Zornia curvata Mohlenbr., Z. gemella Willd. ex Vogel, Z. glabra Desv., Z. latifolia Sm. and Z. reticulata Sm., have overlapping diagnostic characters. The leaflet secretory structures of the five studied taxa of Zornia were mucilage epidermis, mucilage cavities, and idioblasts secreting phenolic compounds. Mucilage epidermis is found in all five aforementioned taxa. Mucilage cavities are observed on both epidermal surfaces of the leaflets in four taxa, the exception being Z. glabra, whose cavities occur only on the abaxial surface. Idioblasts secreting phenolic compounds were detected only in the mesophyll of Z. latifolia and Z. reticulata. The joint occurrence of mucilage epidermis with mucilage cavities seems to be of unifying value for the five taxa analyzed. The position of mucilage cavities and the occurrence of secretory idioblasts in the mesophyll of the leaflets are of diagnostic value, providing a key to enable identification of the taxa studied. This study reveals that the secretory structures provide important information in support of systematic studies of the Leguminosae. In relation to the five taxa of Zornia studied, current results suggest recognition of four species: Z. curvata, Z. glabra, Z. latifolia, and Z. reticulata.

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Acknowledgments

The authors thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq—proc. 141324/2005-8) for a scholarship to the first author; the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP—proc. 06/61648-4 e FAPESP (Temático)—00/12469-3) and the Fundo de Apoio ao Ensino e à Pesquisa (FAEPEX/Unicamp) for provision of financial support; the Curators of the Herbaria for their cooperation; the Programa de Pós-Graduação em Biologia Vegetal (Universidade Estadual de Campinas); the Vegetal Anatomy Laboratory of Department of Plant Biology (Universidade Estadual de Campinas); and Dr Fabiano Martins (Universidade Federal do Recôncavo da Bahia) for his precious help in the laboratory.

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  1. Departamento de Biodiversidade, Evolução e Meio Ambiente, ICEB, Universidade Federal de Ouro Preto, Ouro Preto, MG, 35400-000, Brazil

    Ana Paula Fortuna-Perez

  2. Departamento de Biologia Vegetal, IB, Universidade Estadual de Campinas, Caixa Postal 6109, Campinas, SP, 13083-970, Brazil

    Ana Paula Fortuna-Perez, Marilia de Moraes Castro & Ana Maria Goulart de Azevedo Tozzi

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  1. Ana Paula Fortuna-Perez
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  2. Marilia de Moraes Castro
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  3. Ana Maria Goulart de Azevedo Tozzi
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Correspondence to Ana Paula Fortuna-Perez.

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Fortuna-Perez, A.P., de Moraes Castro, M. & Goulart de Azevedo Tozzi, A.M. Leaflet secretory structures of five taxa of the genus Zornia J.F. Gmel. (Leguminosae, Papilionoideae, Dalbergieae) and their systematic significance. Plant Syst Evol 298, 1415–1424 (2012). https://doi.org/10.1007/s00606-012-0647-z

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