Embryology of Siparunaceae (Laurales): characteristics and character evolution

Journal of Plant Research
Yukitoshi Kimoto, Hiroshi Tobe

Abstract

Embryological characters of Siparunaceae, which are poorly understood, were studied on the basis of two constituent genera, an African Glossocalyx and a South American Siparuna, to better understand their evolution within Laurales. These two genera have many embryological characteristics in common with the other lauralean families. Noticeably, they share the multi-celled ovule archesporium (uncertain in Glossocalyx) as a synapomorphy with all the other lauralean families except Lauraceae, the anthers dehisced by valves as a synspomorphy with all the other lauralean families except Calycanthaceae and Monimiaceae, and the bisporangiate anther as a synapomorphy with Gomortegaceae and Atherospermataceae. Siparunaceae are, however, distinct from all other laularean families in having unitegmic ovules that were derived from bitegmic ovules, probably due to an elimination of the outer integument. Likewise, the lack of the testa (i.e., developed outer integument), the "endotegmic" seed coat, and the perichalazal seed at maturity are also characteristics of Siparunaceae. Within the family, Siparuna differs from Glossocalyx in having plural tetrads of megaspores and plural, starchy-rich, one-nucleate, tubular embryo sacs (autapomorphies)...Continue Reading

Citations

Apr 26, 2006·Journal of Plant Research·Kazuo Oginuma, Hiroshi Tobe
Apr 12, 2007·Journal of Plant Research·Hiroshi TobeNallamilli Prakash
Dec 1, 2010·Journal of Plant Research·Hiroshi Tobe, Peter H Raven
Jan 1, 2009·American Journal of Botany·Peter K Endress, James A Doyle
Jan 13, 2021·Biological Reviews of the Cambridge Philosophical Society·Paula J Rudall

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