Ultrastructure and secretion of glandular trichomes in species of subtribe Cajaninae Benth (Leguminosae, Phaseoleae)

Made available in DSpace on 2019-10-04T12:36:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-03-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The subtribe Cajaninae of papilionoid legumes has a pantropical distribution and comprises approximately 490 species. These species have diversified throughout dry environments where there are high temperatures and strong light. The subtribe stands out because all its representatives have vesicular glands. In addition, bulbous-based and capitate trichomes are important secretory structures present in all genera of the Cajaninae. We analyzed the ultrastructure and histochemistry of these glandular trichome types in leaflets of the three species of the subtribe. Using transmission electron microscopy and histochemical analyses, we link the glandular secretions to subcellular structures. We here report for the first time the type of exudate and ultrastructure of the glands of subtribe Cajaninae. Terpenoids and phenolics were confirmed by histochemistry tests, and we observed that the organelles responsible for biosynthesis of oils are the most representative in these glands. Each glandular trichome showed particular ultrastructural features compatible with the compounds produced. We suggest that these glandular trichomes, with their respective exudates, act in defense against herbivory and against possible damage by ultraviolet radiation. Univ Estadual Paulista, Inst Biociencias, Programa Posgrad Ciencias Biol Bot, Dept Bot,Inst Biociencias, BR-18618000 Botucatu, SP, Brazil Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Programa Posgrad Biol Vegetal, BR-13083862 Campinas, SP, Brazil Royal Bot Gardens, Comparat Plant & Fungal Biol Dept, Richmond TW9 3AB, Surrey, England Smithsonian Inst, NMNH, Dept Bot, US Natl Herbarium US, MRC 166,10th & Constitut Ave, Washington, DC 20560 USA Univ Copenhagen, Dept Geosci & Nat Resource Management, Rolighedsvej 23, DK-1958 Frederiksberg C, Denmark Univ Estadual Paulista, Inst Biociencias, Programa Posgrad Ciencias Biol Bot, Dept Bot,Inst Biociencias, BR-18618000 Botucatu, SP, Brazil FAPESP: 2015/13386-0 CNPq: 457911/2013-1 CNPq: 400567/2016-4 CNPq: 304396/2015-0 CNPq: 140598/2015-4