Development of the Remarkable Pollen Apertures of the Jellyfish TreeMedusagyne oppositifolia(Ochnaceae, Malpighiales)

Autor:	Carol A. Furness
Rok vydání:	2014
Předmět:	Jellyfish biology Stamen food and beverages Medusagyne Ochnaceae Plant Science biology.organism_classification medicine.disease_cause Foot layer Malpighiales biology.animal Pollen Botany medicine Ecology Evolution Behavior and Systematics
Zdroj:	International Journal of Plant Sciences. 175:803-813
ISSN:	1537-5315 1058-5893
DOI:	10.1086/676984
Popis:	Pollen development is examined in Medusagyne oppositifolia, a critically endangered tree endemic to the Seychelles. Formerly placed in its own family, M. oppositifolia is now assigned to Ochnaceae in Malpighiales. Pollen and tapetal characters have previously been shown to be of systematic importance in Malpighiales. The pollen of M. oppositifolia has remarkable projecting porate apertures, but their development was previously unknown. Pollen development was studied using transmission electron microscopy (TEM) of sections of anthers obtained from buds of cultivated M. oppositifolia. Amorphous endexine is deposited without the involvement of lamellae, a rare form of endexine deposition in flowering plants. This flexible endexine is pushed into position inside the atria (apertural cavities) by the expanding intine. Foot layer, not endexine, is deposited on lamellations with white lines, which is highly unusual. Extremely large onci, consisting of fibrillar spacer material, begin development during the tetra...
Databáze:	OpenAIRE
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