Abstract Detail

Celebrating More Than Three Decades of Research in Nymphaeales: A Colloquium Honoring Ed Schneider

Seago, James L. [1], Yang, Chaodong [2], Zhang, Xia [2], Bachelier, Julien [3], Yuan, Longyi [2], Ai, Xunru [4], Razik, Imran [5].

Anatomical Aspects of Nymphaeales That Ed Schneider Did Not Do - Mostly Under Water.

While many studies of members of the Nymphaeales have dealt with floral and reproductive characteristics and processes and much work has been concerned with phylogeny, we have been examining various structural, vegetative characteristics of members of the three families which comprise the Nymphaeales, the Nymphaeaceae, the Cabombaceae, and the recently added Hydatellaceae. In our summary of the anatomical traits of roots and shoots, we will use information from some of our earlier works (e.g., Seago, 2002; Seago and Fernando, 2013), plus new findings. We will not review the many xylem studies of Schneider and Carlquist. In the Nymphaeaceae, from the very large-leafed Victoria to the very small-leafed Nymphaea thermarum, stems, but not petioles, generally have an endodermis with Casparian bands only; we have not confirmed an exodermal barrier layer. Stem vasculature is generally polystelic with an endodermis surrounding each stele, and petioles have peripheral collenchyma. Most species have expansigenous aerenchyma and cortical sclereids in roots and shoots. Roots have polyarch steles, except for the steles of the smallest Nymphaea species which are pentarch; an exodermis has Casparian bands and suberin lamellae. In the Cabombaceae and Hydatellaceae, roots are monarch to diarch; the stele is surrounded by an expansigenous cortex with an endodermis with Casparian bands and suberin lamellae, often prominently on the outer tangential walls; an exodermis has prominent Casparian bands and suberin lamellae. Stems are mono- to distelic, usually with an endodermis of Casparian bands surrounding the enclosed xylem, phloem and parenchyma; an exodermis has been found in Trithuria. Petioles of leaves have very simple vascular traces and bundles without barrier layers, and pedicels also lack barrier layers. The aerenchymatous tissues of stems and leaves also arise mostly by expansigeny, and epidermis often contains trichomes.

1 - Seago Botanical Consulting, Biologcial Sciences, SUNY at Oswego, Minetto, NY, 13115-0316, USA
2 - Yangtze University, Jingzhou, China
3 - SUNY at Oswego, Biological Sciences, NY 104 West, Oswego, NY, 13126, USA
4 - Hubei Minzu University, Enshi, China
5 - SUNY at Oswego, Biological Sciences, Oswego, NY, 13126, USA

Keywords:
Anatomy
Nymphaeales.

Presentation Type: Colloquium Presentations
Session: C3
Location: Salon 12/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 9:30 AM
Number: C3004
Abstract ID:159
Candidate for Awards:None