TGGE analysis of PCRamplified
16S rDNA fragments
has been applied to compare bacterial populations
inhabiting the rhizosphere and phyllosphere of
transgenic potato plants expressing T4lysozyme
and
nontransgenic
potato plants (Figure 3; Heuer&Smalla,
1997). TGGE patterns of rDNA fragments from
the rhizosphere were complex, but identical between
transgenic and nontransgenic
plants. In contrast, profiles
obtained from the phyllosphere samples were less
complex, but showed much more variation between
plants.
Heuer et al. (1997) used DGGE and TGGE to
study the genetic diversity of actinomycetes in different
soils, and to monitor shifts in their abundances
in the potato rhizosphere. In this study, the
authors used two amplification strategies, i.e., a direct
amplification of the actinomycetes 16S rDNA using
groupspecific
primers, and an indirect amplification
approach, whereby actinomycetes specific DNA fragments
were generated with a forward groupspecific
TGGE analysis of PCRamplified16S rDNA fragmentshas been applied to compare bacterial populationsinhabiting the rhizosphere and phyllosphere oftransgenic potato plants expressing T4lysozymeandnontransgenicpotato plants (Figure 3; Heuer&Smalla,1997). TGGE patterns of rDNA fragments fromthe rhizosphere were complex, but identical betweentransgenic and nontransgenicplants. In contrast, profilesobtained from the phyllosphere samples were lesscomplex, but showed much more variation betweenplants.Heuer et al. (1997) used DGGE and TGGE tostudy the genetic diversity of actinomycetes in differentsoils, and to monitor shifts in their abundancesin the potato rhizosphere. In this study, theauthors used two amplification strategies, i.e., a directamplification of the actinomycetes 16S rDNA usinggroupspecificprimers, and an indirect amplificationapproach, whereby actinomycetes specific DNA fragmentswere generated with a forward groupspecific
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