Abstract Detail

Developmental and Structural Section

Osborn, Jeffrey M. [1], Schwartz, Julie A. [1], Gutman, Benjamin L. [1], Melrose, Natalie A. [1].

Pollen and anther development in Cabomba (Cabombaceae, Nymphaeales).

The Nymphaeales, or water lilies, have a cosmopolitan distribution in fresh water habitats and comprise two families and eight genera: Nymphaeaceae (Victoria, Euryale, Nymphaea, Ondinea, Barclaya, Nuphar) and Cabombaceae (Cabomba, Brasenia). Water lilies are widely regarded to be among the most primitive flowering plants, as recent phylogenetic studies have consistently indicated that either Amborella or Amborella plus Nymphaeales is the sister group to the remaining angiosperms. Although studies of pollen development provide important data for assessing phylogeny, little is known about these characters in Cabomba. In this presentation, pollen and anther ontogeny will be described for Cabomba caroliniana Gray, which have been studied using scanning electron, transmission electron, and light microscopy. Anthers at the sporogenous tissue, microspore mother cell, tetrad, free microspore, and mature pollen grain stages will be documented. Events including the deposition of a microspore mother cell coat, a callose

1 - Division of Science, Truman State University, 100 E. Normal Street, Kirksville, MO 63501-4221

Keywords: Cabomba, Cabombaceae, Nymphaeales, pollen, Pollen Development, Ontogeny, basal angiosperms, ultrastructure, Aquatic plants, morphology.
Abstract ID:642

Presentation Type: Paper
Session: 9-2
Location: MCC, 202A
Date: Monday, July 28th, 2003
Time: 1:15 PM