UNSPECIFIED. (2004) In situ monitoring of streptothricin production by Streptomyces rochei F20 in soil and rhizosphere. APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 70 (9). pp. 5222-5228. ISSN 0099-2240

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Abstract

The onset of streptothricin (ST) biosynthesis in Streptomyces rochei F20 was studied by using reverse transcription-PCR (RT-PCR) to detect transcripts of ST genes during growth in liquid medium, soil, and the rhizosphere. In situ results correlated with those obtained in vitro, illustrating the growth phase-dependent manner of ST production by F20. Maximal transcription of ST resistance (sttR) and biosynthesis (sttA) genes occurred during the transition between the exponential and stationary phases of growth, when the specific growth rate (mu) started to decline. A higher level of gene expression of sttR versus sttA was observed in all experiments. In liquid culture, maximal transcript accumulation of the sttA gene was only ca. 40% that of the sttR gene. sttA and sttR mRNAs were detected in soil containing approximately 10(6) CFU of growing cells g of soil(-1). sttR mRNA was detected in sterile and nonsterile rhizosphere colonized with growing mycelium of F20 at 1.2 x 10(6) and 4.0 x 10(5) CFU g of soil(-1), respectively. However, neither sttR nor sttA transcripts were detected by RT-PCR in the rhizoplane, which supported a lower population density of F20 than the rhizosphere.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology Q Science > QR Microbiology
Journal or Publication Title:	APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Publisher:	AMER SOC MICROBIOLOGY
ISSN:	0099-2240
Date:	September 2004
Volume:	70
Number:	9
Number of Pages:	7
Page Range:	pp. 5222-5228
Identification Number:	10.1128/AEM.70.9.5222-5228.2004
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/8047

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