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Distribution, genetic diversity and ...

Hofstra, Thomas Sjoerd.

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Distribution, genetic diversity and compositional variation of wetwood prokaryote communities within and among two native California Populus species.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Distribution, genetic diversity and compositional variation of wetwood prokaryote communities within and among two native California Populus species./
Author:	Hofstra, Thomas Sjoerd.
Description:	159 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3053.
Contained By:	Dissertation Abstracts International64-07B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3097820

Distribution, genetic diversity and compositional variation of wetwood prokaryote communities within and among two native California Populus species.
Hofstra, Thomas Sjoerd.

Distribution, genetic diversity and compositional variation of wetwood prokaryote communities within and among two native California Populus species. - 159 p.

Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3053.

Thesis (Ph.D.)--University of California, Santa Cruz, 2003.

Wetwood is a chronic condition of many tree species characterized by water-soaked and stained wood, high internal gas pressures, elevated pH, bleeding from stem junctions and wounds, branch die-back and canopy decline. Wetwood often supports communities of anaerobic fermentative and methanogenic prokaryotes. The spatial distribution of prokaryotes, host tissue damage, and wetwood symptoms including staining and elevated pH were determined within the trunk of Populus baslamifera ssp. trichocarpa. A conical area of wetwood, widest at ground level, tapers to a point in the upper trunk. Unstained sapwood is slightly acid, whereas wetwood is slightly alkaline, and pH changes abruptly at the unstained sapwood-wetwood boundary. Scanning electron microscopy revealed prokaryotes within vessels of wetwood in contact with degraded vessel-to-ray pit membranes. They are most abundant in interior wetwood and not seen in unstained sapwood. Vessel-to-ray pit membranes are intact in unstained sapwood, degraded at the wetwood boundary and destroyed in interior wetwood.Subjects--Topical Terms:

1017726
Biology, Ecology.

Distribution, genetic diversity and compositional variation of wetwood prokaryote communities within and among two native California Populus species.
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035 $a (UnM)AAI3097820
035 $a AAI3097820
040 $a UnM $c UnM
100 1 $a Hofstra, Thomas Sjoerd. $3 1949598
245 1 0 $a Distribution, genetic diversity and compositional variation of wetwood prokaryote communities within and among two native California Populus species.
300 $a 159 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3053.
500 $a Chair: Jean H. Langenheim.
502 $a Thesis (Ph.D.)--University of California, Santa Cruz, 2003.
520 $a Wetwood is a chronic condition of many tree species characterized by water-soaked and stained wood, high internal gas pressures, elevated pH, bleeding from stem junctions and wounds, branch die-back and canopy decline. Wetwood often supports communities of anaerobic fermentative and methanogenic prokaryotes. The spatial distribution of prokaryotes, host tissue damage, and wetwood symptoms including staining and elevated pH were determined within the trunk of Populus baslamifera ssp. trichocarpa. A conical area of wetwood, widest at ground level, tapers to a point in the upper trunk. Unstained sapwood is slightly acid, whereas wetwood is slightly alkaline, and pH changes abruptly at the unstained sapwood-wetwood boundary. Scanning electron microscopy revealed prokaryotes within vessels of wetwood in contact with degraded vessel-to-ray pit membranes. They are most abundant in interior wetwood and not seen in unstained sapwood. Vessel-to-ray pit membranes are intact in unstained sapwood, degraded at the wetwood boundary and destroyed in interior wetwood.
520 $a I identified prokaryotic 16S rDNA from wetwood of Populus balsamifera ssp. trichocarpa and P. fremontii ssp. fremontii. In one hundred eighty-seven prokaryotic DNA sequences, diversity includes the genera Bacteroides, Cytophaga, Clostridium, Sporomusa, Termitobacter, Desulfosporosinus, Desulfotomaculum, Sinorhizobium, Pseudomonas and Methanobacterium. I report Cytophaga, Sporomusa, Termitobacter, Desulfosporosinus, Desulfotomaculum, Sinorhizobium and Methanobacterium in wetwood for the first time. All the taxa delineated have at least some ability to grow anaerobically and most are obligate anaerobes. Most Eubacteria found are from fermentative taxa, which occurred in all trees examined. All Archaeal sequences belong to methanogenic taxa. Sulfate reducing prokaryotes are identified in wetwood for the first time, as well as denitrifiers and nitrogen fixers.
520 $a I compared community composition within and among individual hosts, sites, and two cottonwood species (Populus balsamifera ssp. trichocarpa and P. fremontii ssp. fremontii) from four wild populations in California, using denaturing gradient gel electrophoresis (DGGE). Density plots of denaturing gradient gel electropherograms were compared using Bray-Curtis ordination to reveal patterns of similarity among wetwood communities. Wetwood Eubacterial community composition varies within individual hosts with height, but does not vary among core samples within individual hosts at the same height. Community composition varies among hosts, stands, sites and hosts species.
590 $a School code: 0036.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Microbiology. $3 1017734
650 4 $a Agriculture, Plant Pathology. $3 1028950
650 4 $a Agriculture, Forestry and Wildlife. $3 783690
690 $a 0329
690 $a 0410
690 $a 0480
690 $a 0478
710 2 0 $a University of California, Santa Cruz. $3 1018764
773 0 $t Dissertation Abstracts International $g 64-07B.
790 1 0 $a Langenheim, Jean H., $e advisor
790 $a 0036
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3097820