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日時: 2018年6月18日(月) 13時00分~14時30分
場所: 熱帯生物圏研究センター分子生命科学研究施設 講義室 S110
演者: Prof. Patrick von Aderkas(University of Victoria, Canada)
演題: Evolution of pollination drops and nectar in gymnosperms
公演概要: All extant gymnosperm groups produce complex reproductive secretions containing proteins, carbohydrates, amino acids and other small molecular weight compounds. This complexity represents a plesiomorphic state that likely contributed to the evolutionary success of seed plants. Proteins involved in defense and carbohydrate modification occur in female drops of most groups, indicating conserved functions for proteins in pollination drops. In species that produce male and female pollination drops, such as Welwitschia mirabilis and Gnetum gnemon, protein profiles imply functional, gender-based differences, pointing to evolution of nectar in gymnosperms. Profiles of carbohydrates and amino acids allow us to separate insect and wind-pollinated (ambophilous) clades, such as cycads and Gnetales, from solely wind-pollinated (anemophilous) ones, such as conifers. Total sugar concentrations were significantly higher in ovular secretions of ambophilous species than wind-pollinated taxa such as Pinaceae and Cupressophyta. Ambophilous species had lower amounts of total amino acids, and a higher proportion of non-protein amino acids compared with anemophilous lineages, and were also comparable to angiosperm nectar. Ginkgo biloba, thought to be anemophilous, had a profile typical of ambophilous taxa, suggesting that insect pollination either exists in G. biloba, but is undocumented, or that its ancestral populations were insect-pollinated. Chemical profiles of ovular secretions of ambophilous gymnosperms show a clear signal of pollinator-driven selection in carbohydrates, amino acids, and – in the particular instance of nectar – proteins.

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平成30年度 第1回 琉大熱帯生物圏研究センターセミナー