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Research paper Botanica Pacifica. A journal of plant science and conservation 2024. Preprint Article first published online: 04 AUG 2024 | DOI: 10.17581/bp.2024.13208 Ultrasculptura of carpopodium surface in species of the Astereae tribe (Asteraceae) Elvira V. Boyko ![]() ![]() ![]() G.B. Elyаkov Pacific Institute of Bioorganic Chemistry FEB RAS, Vladivostok, Russia The study discusses the ultrastructural characteristics of the carpopodium surface of cypselas in 81 species from 34 genera within 16 subtribes of the Astereae tribe (Asteraceae) observed using a scanning electron microscope. These species exhibit well-developed carpopodia categorized into three types: poorly advanced, moderately advanced, and highly advanced. The carpopodia in the species analyzed vary in type (symmetrical, asymmetric, interrupted), the number of cell rows, cell shape, cell orientation, and outer periclinal wall shape. Most species have symmetrical carpopodia with cells forming a complete ring consisting of different numbers of rows (ranging from 1 to 22), although asymmetric or interrupted carpopodia are also present but less common. Different types of carpopodia may exist within a subtribe or genus, and the structural characteristics of the carpopodium serve as a taxonomic criterion at the species level. Бойко Э.В., Новожилова Е.В., Горовой П.Г. Ультраскульптура поверхности карпоподиума видов трибы Astereae (Asteraceae). В настоящей ра- боте представлены результаты исследования строения поверхности карпоподиума семянок 81 вида из 34 родов, относящихся к 16 подтрибам трибы Astereae (Asteraceae), методом сканирующей электронной микроскопии. Установлено, что виды трибы характеризуются наличием хорошо развитого карпоподиума трех типов: слабопродвинутый, умеренно продвинутый и высокопродвинутый. Карпоподиумы исследованных таксонов различаются по типу (симметричный, асимметричный, прерывистый), количеству рядов клеток, слагающих их, форме клеток, их ориентацией, формой наружной периклинальной стенки. У семянок большинства видов трибы карпоподиум симметричный, его клетки образуют замкнутое кольцо из различного количества рядов (от 1 до 22), значительно реже карпоподиум асимметричный или прерывистый. В пределах подтрибы у одного рода могут встречаться различные типы карпоподиума. Особенности строения карпоподиума (комплекс признаков) являются таксономическим критерием на видовом уровне. Keywords: carpopodium, Asteraceae, Astereae, pericarp, scanning electronic microscopy (SEM), cypselas, systematics, карпоподиум, семянка, систематика, сканирующая электронная микроскопия (СЭМ) References Alrasheed, M.M., M.S. Alwahibi & S.K. Alnemar 2023. Morphological characterization of Pulicaria crispa (Asteraceae) achenes of four populations distributed in the central region of Saudi Arabia. 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