NDLI: Pollen ontogeny in Magnolia liliflora Desr.

Content Provider	Springer Nature Link
Author	Galati, B. G. Zarlavsky, G. Rosenfeldt, S. Gotelli, M. M.
Copyright Year	2011
Abstract	Pollen ontogeny contributes significantly to the evolutionary analysis and the understanding of the reproductive biology of seed plants. Although much research on basal angiosperms is being carried out there are still many important features about which little is known in these taxa, such as the sporophytic structures related to pollen development and morphology. In this study, pollen development of Magnolia liliflora was analyzed by optical microscopy and transmission electron microscopy. The aim of this paper was to supply data that will help characterize basal angiosperms. Microsporogenesis is of the successive type, so that tetrads are decussate or isobilateral. The callosic walls form by the centripetal growth of furrows. The secretory tapetum develops orbicules, which start to form in the microspore tetrad stage. Pollen grains are shed at the bicellular stage. The exine wall has a granular infratectum. Ultrastructural changes observed in the cytoplasm of microspores and tapetal cells are related to the development of the pollen grain wall and orbicules. Centrifugal cell plates are more usual for the successive type of microsporogenesis. The presence of the successive type of microsporogenesis with callosic walls formed by the centripetal growth of furrows could reflect the fact that the successive type in Magnoliaceae is derived from the simultaneous type. The granular infratectum of the ectexine and the presence of orbicules could indicate that this species is one of the most evolved of the genus.
Starting Page	527
Ending Page	534
Page Count	8
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	298
Issue Number	3
e-ISSN	16156110
Language	English
Publisher	Springer Vienna
Publisher Date	2011-11-18
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnolia liliflora Basal angiosperms Centripetally growing furrows Orbicules Pollen Plant Ecology Plant Sciences Plant Systematics/Taxonomy/Biogeography Plant Anatomy/Development
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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