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Abstract Detail

Floristics & Taxonomy

Silva, Anauara Lima [1], Lima Diniz Basílio, Ionaldo [2], Agra, Maria [3].

Leaf anatomy and application of FTIR Spectroscopy in leaves of species of Solanum sect. Polytrichum (Whalen) Child.

Solanum sect. Polytrichum (Whalen) Child comprises about nine species, from South America, characterized as armed plants with acicular to subulate/gladiate or deltoid prickles; stellate stalked trichomes and bristles; corolla stellate; fruits pilose or not, enclosed by the enlarged and prickly calyx tube.The present work aims to study four species of Solanum sect. Polytrichum (Leptostemonum) in order to find additional characters to separate them, as subsidies to their taxonomy: Solanum echidnaeforme Dunal, S. hexandrum Vell., S. kollastrum Gouvêa &  Giacomin, and S. stagnale Moric. Usual techniques of plant anatomy were used with light and scanning electronic microscopy, and were obtained data from infrared spectrometry with Fourier Transform for S. echidnaeforme and S. hexandrum. Sinuous anticlinal cell walls was common to all species. The pattern of stomata distribution was hypostomatic in S. echidnaeforme and S. stagnale, and amphistomatic in S. hexandrum and S. kollastrum. All species showed more than one type of stomata, anisocytic and anomocytic, except for S. kollastrum, and the grouped type in S. hexandrum. Solanum kollastrum showed stellate-glandular stalked, and multiangulate trichomes. The leaf edges are rounded in S. echidnaeforme and S. kollastrum, revolute in S. hexandrum, and truncate in S. stagnale. All species have midrib biconvex with bicolateral central vascular bundle, in arc-shaped, except for  S. hexandrum with U-shaped. The vascular system has three vascular bundles, one central and two accessories, in U-shape in S. echidnaeforme and S. hexandrum, and in arch-shaped in S. kollastrum and S. stagnale. The infrared region of 1800-400 cm-1 was chosen for the selection of the peaks, since above that there was no deformation and/or relevant stretching. Peaks suggestive of phenolic (1720 cm-1) and / or methyl esters (1740 cm-1) were observed in samples of S. hexadrum. However, in samples of S. echidnaeforme with maximum bands were observed in these regions, however, specific maximum bands, suggestive for amides, were observed in 1544-1533 cm-1, which is not seen in S. hexandrum. Stomata distribution, leaf edge, number of bundles, vascular bundle shape of the midrib, and the distinct maximum bands in FTIR, support the existence of two distinct taxa: S. hexandrum and S. echidnaeforme. Solanum kollastrum and S. stagnale also appear apart from the others species of the section Polytrichum. The leaf anatomy and FTIR spectroscopy provided support for the taxonomic distinction between the species studied, especially S. hexandrum and S. echidnaeforme, which have been synonymized, or misidentified in Brazilian herbaria.

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1 - Universidade Federal da Paraíba, Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde, João Pessoa, Paraíba
2 - Universidade Federal da Paraíba, Departamento de Ciências Farmacêuticas, Centro de Ciências da Saúde, João Pessoa, Paraíba, Brasil
3 - Universidade Federal da Paraíba, Departamento de Biotecnologia, Centro de Biotecnologia, João Pessoa, Paraíba, Brasil

Solanum subg. Leptostemonum
leaf anatomy.

Presentation Type: Poster
Session: P2, Floristics & Taxonomy Posters
Location: Virtual/Virtual
Date: Tuesday, July 20th, 2021
Time: 5:00 PM(EDT)
Number: P2FT011
Abstract ID:908
Candidate for Awards:None

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