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Abstract Detail


Plant-Symbiont Interactions

Sharda, Jori N [1], Koide, Roger T [2].

Investigating the role of root anatomy in phosphorus-mediated regulation of arbuscular mycorrhizal colonization.

The majority of terrestrial plant species are colonized by arbuscular mycorrhizal fungi (AMF). Plants benefit from this symbiosis particularly in soils with low phosphorus (P) availability, due to an increase in host plant P uptake. In soils of higher P availability, however, a decrease in the degree of AMF colonization has been observed numerous times. This observation has been made across many plant species and families, but the exact mechanisms behind it remain somewhat unexplained. Although P-mediated root exudation, root soluble carbohydrates, and gene regulation have been examined as mechanisms that could explain this observation, P-mediated anatomical changes in roots have not been examined. In this study, three anatomical traits--root porosity, suberization of the hypodermis, and hypodermis short cell distribution—will be tested for their responsiveness to P availability as well as their ability to regulate colonization. Root porosity could regulate mycorrhizal colonization through its effects on intercellular hyphal spread. The degree of suberization in the root hypodermis could also regulate colonization as suberin is impenetrable to fungi. Species that have unsuberized “short” cells in the hypodermis could restrict the entry of fungi through the hypodermis by altering the density of these cells. The results from the porosity and short cell characterization are presented here.


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1 - Pennsylvania State University, Plant Biology, 105 Tyson Building, University Park, PA, 16802, USA
2 - Pennsylvania State University, Horticulture

Keywords:
arbuscular mycorrhiza
phosphorus
root anatomy.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P16021
Abstract ID:2672


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