Floral ontogeny of Magnolia (Magnoliaceae) species provides insights into floral evolution but does not possess taxonomic value at the genus level

LI-YONG SUN; XIAO-XIA WAN; TANG-JIE NIE; YAO CHEN; ZENG-FANG YIN

doi:10.11646/phytotaxa.583.2.3

Issue: Vol. 583 No. 2: 2 February 2023

Type: Article

Published: 2023-02-02

DOI: 10.11646/phytotaxa.583.2.3

Page range: 153–162

Abstract views: 69

PDF downloaded: 2

**Floral ontogeny of Magnolia (Magnoliaceae) species provides insights into floral evolution but does not possess taxonomic value at the genus level**

LI-YONG SUN⁺⁻
XIAO-XIA WAN⁺⁻
TANG-JIE NIE⁺⁻
YAO CHEN⁺⁻
ZENG-FANG YIN⁺⁻

Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, China

Magnoliids Classification of Magnolia floral organogenesis floral evolutionary trends Magnolia subgenus Yulania Michelia Polycarpicae Yulania

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Abstract

Floral ontogeny can assist in understanding formation of mature floral structure and provide taxonomic and evolutionary insights at the species and genus level. In this study, floral ontogeny of Magnolia liliiflora, M. maudiae and M. figo was investigated using scanning electron microscopy. The results showed that tepal primordia of these species are initiated asynchronously in whorls, whereas stamen and carpel primordia are initiated spirally and centripetally. Variation in tepal number in M. maudiae was also observed at the early stage of differentiation. Our study demonstrates that floral ontogeny is remarkably homogenous in Magnoliaceae, and thus it cannot serve as a basis for classification at the genus or lower taxonomic levels. Nonetheless, the transition of floral development from typical spiral flowers to typical whorled flowers is of great significance for understanding evolution of angiosperm flowers.

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