Seed Characters And Their Taxonomic Implications In Molluginaceae (Caryophyllales)тезисы доклада

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[1] Seed characters and their taxonomic implications in molluginaceae (caryophyllales) / A. P. Sukhorukov, M. Kushunina, M. V. Nilova et al. // Congress Abstract Book at the XIX International Botanical Congress 2017. — Shenzhen, 2017. The Molluginaceae family includes ∼90 species distributed worldwide. Its circumscription and intrafamilial relationships were recently reevaluated after molecular investigations, but the seed characters and their evolutionary trends are poorly known. The seeds of 76 species from all 11 genera of Molluginaceae were studied. Fourteen morphological and anatomical seed characters were analysed, with further conclusions for characterization of the genera or major clades within the family. The genus Pharnaceum in its recent circumscription is carpologically heterogeneous, and all seed characters of Pharnaceum namaquense and P. pusillum, which were transferred into this genus based on the morphological similarities, indicate their position within Hypertelis. The generic placement of Pharnaceum serpyllifolium is also ambiguous. The genus Kewa (Kewaceae, previously considered within Hypertelis) shares many carpological homoplasies with Molluginaceae. The evolutionary history of some characters (seed number, ornamentation and presence of stalactites in the outer walls of the testa cells) is reconstructed using phylogenetic analysis. The ‘Polpoda – Adenogramma + Psammotropha’ subclade is the only lineage in which the one-seeded fruits evolved. The loss of the stalactites in the outer walls of the testa cells seems to be connected with the reduction in the testa thickness. The seed traits in the ‘Globular Inclusion’ clade (core Caryophyllales) are briefly discussed, and Molluginaceae are compared with other representatives of the clade. Among the taxa of the ‘Globular Inclusion’ clade with multi-seeded fruits, the smallest seeds have evolved in some genera of Molluginaceae.

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