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Developmental and Structural Section

Tennakoon, Kushan U. [1], Bolin, Jay F. [1], Musselman, Lytton John [1].

"Pilot Roots" of Hydnora triceps and H. africana (Hydnoraceae) are Stems.

Achlorophyllous root holoparasites with extremely reduced vegetative bodies, Hydnora spp are the only known angiosperms with no leaves or scales. The vegetative body consists of "pilot roots", poorly studied structures bearing haustoria and flowers. Our studies show a "chimeral" apical structure and a protective layer of cells similar to a root cap at the growing tip. However, eustelic, endarch, and collateral vascular bundles and the continuous pith indicate "pilot roots" are stems. Increased girth is due to the fascicular cambium, periderm, and strands of cells distributed in the main vegetative body similar to a primary thickening meristem. The haustorium and the reproductive structures of Hydnora initiate exogenously from the "root bumps" (outgrowths of the vegetative body). An endophytic primordium penetrated the host root with a. stratified meristem giving rise to xylary and phloic hyphae, and transfer cells.


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Related Links:
Hydnora Plant Site, Old Dominion University


1 - Old Dominion University, Department of Biological Sciences, Mills Godwin Building, 45th Street, Norfolk, Virginia, 23529-0266, USA

Keywords:
root parasite
haustorium
morphogenesis.

Presentation Type: Poster
Session: 33-10
Location: Salon C, D & E - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 12:30 PM
Abstract ID:190


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