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Hydrogen peroxide in semagenesis. E...

Keyes, William John.

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Hydrogen peroxide in semagenesis. Exploiting host defenses for host detection.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Hydrogen peroxide in semagenesis. Exploiting host defenses for host detection./
作者:	Keyes, William John.
面頁冊數:	66 p.
附註:	Adviser: David G. Lynn.
Contained By:	Dissertation Abstracts International63-04B.
標題:	Agriculture, Plant Pathology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3048395
ISBN:	0493627421

Hydrogen peroxide in semagenesis. Exploiting host defenses for host detection.
Keyes, William John.

Hydrogen peroxide in semagenesis. Exploiting host defenses for host detection. - 66 p.

Adviser: David G. Lynn.

Thesis (Ph.D.)--The University of Chicago, 2002.

The parasitic angiosperms depend on specific sensory pathways to regulate commitment to host plants. In <italic>Striga asiatica</italic>, contact between the parasitic seedling and the host surface is known to result in the release of xenognostic quinones from the host's cell wall; however, the mechanisms that mediate the release and the controls on the process are unknown. Image analysis of the <italic>S. asiatica</italic> seedling with laser scanning confocal microscopy and electron microscopy have now revealed a constitutive production of H2O2 radiating from the surface cells of the root meristem. Specific inhibitor studies suggest that the source of the H2O2 is a NAD(P)H oxidase, and that the oxidant is maintained at a threshold below that necessary for the activation of cell defense and programmed cell death usually associated with H2 O2 production. Moreover, the xenognostic quinones down-regulate H2O2 production. The timing and concentration dependence for this down-regulation suggest that sophisticated feed-back controls exist to fine-tune the H2O2 concentration so as to avoid host defenses.

ISBN: 0493627421Subjects--Topical Terms:

1028950
Agriculture, Plant Pathology.

Hydrogen peroxide in semagenesis. Exploiting host defenses for host detection.
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502 $a Thesis (Ph.D.)--The University of Chicago, 2002.
520 $a The parasitic angiosperms depend on specific sensory pathways to regulate commitment to host plants. In <italic>Striga asiatica</italic>, contact between the parasitic seedling and the host surface is known to result in the release of xenognostic quinones from the host's cell wall; however, the mechanisms that mediate the release and the controls on the process are unknown. Image analysis of the <italic>S. asiatica</italic> seedling with laser scanning confocal microscopy and electron microscopy have now revealed a constitutive production of H2O2 radiating from the surface cells of the root meristem. Specific inhibitor studies suggest that the source of the H2O2 is a NAD(P)H oxidase, and that the oxidant is maintained at a threshold below that necessary for the activation of cell defense and programmed cell death usually associated with H2 O2 production. Moreover, the xenognostic quinones down-regulate H2O2 production. The timing and concentration dependence for this down-regulation suggest that sophisticated feed-back controls exist to fine-tune the H2O2 concentration so as to avoid host defenses.
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