Comparative structure and development of pollen and tapetum in Pandanales

The newly recircumscribed monocot order Pandanales now includes five families: Cyclanthaceae, Pandanaceae, Stemonaceae, Triuridaceae, and Velloziaceae. We present new data and a review of pollen morphology, microsporogenesis, and tapetal characters in Pandanales in a systematic context. Probable ple...

Full description

Saved in:
Bibliographic Details
Published in:International journal of plant sciences 2006-03, Vol.167 (2), p.331-348
Main Authors: Furness, C.A, Rudall, P.J
Format: Article
Language:English
Subjects:
Anthers
Cell walls
Dyadic relations
Ethanol
Flowers & plants
Genera
Microspores
Microsporogenesis
Monads
Pandanales
Phosphates
plant development
Plant growth
plant morphology
Plant reproduction
Pollen
sporulation
tapetum
Taxonomy
ultrastructure
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The newly recircumscribed monocot order Pandanales now includes five families: Cyclanthaceae, Pandanaceae, Stemonaceae, Triuridaceae, and Velloziaceae. We present new data and a review of pollen morphology, microsporogenesis, and tapetal characters in Pandanales in a systematic context. Probable plesiomorphic character states include pollen dispersed as monads, pollen small to medium in size with an ovoid shape, monosulcate apertures, perforate to reticulate sculpturing, a columellate exine with a foot layer, successive microsporogenesis, and a secretory tapetum. These correspond to generalized monocot or lilioid pollen and anther character states, and all occur within Dioscoreales, the sister group to Pandanales. Within Pandanales, there are apparently homoplastic trends in each family toward either reduction in aperture size (e.g., from sulci to pores) or covering the aperture with exine (e.g., from monosulcate to monosulcate‐operculate), resulting in a reduction in the delicate apertural area exposed to desiccation and entry of pathogens. Apomorphic character states in Pandanales include pollen dispersed as tetrads (only inVellozia), reniform pollen (in some Pandanaceae), ulcerate apertures (in some Cyclanthaceae and some Pandanaceae), inaperturate pollen (in some Stemonaceae, Triuridaceae, andVellozia), monosulcate‐operculate apertures (in some Velloziaceae), pollen surface with protuberances (in some Pandanaceae, some Stemonaceae, Triuridaceae, and some Velloziaceae), exine reduced to a foot layer (some Pandanaceae,Pentastemona, and Triuridaceae), columellate/granular or granular exine (only in someStemonaspecies), endexine lamellae absent (in Cyclanthaceae), and invasive tapetum (inTalbotiaand possibly some Pandanaceae and Triuridaceae).
ISSN:1058-5893
1537-5315
DOI:10.1086/499503