1. Amann RI, Zarda B, Stahl DA and Schleifer H-H (1992) Identification of individual prokaryotie cells by using enzyme labelled, rRNA targeted oligonucleotide probes. Appl Environ Microbiol 58: 3007–3011
2. Andrews JH, Hirano SS (1991) Microbial ecology of leaves. Springer, Berlin, Heidelberg, New York
3. Ausubel FM, Brent R, Kingston RE, Moore DD, Seidman JG, Smith JA, Struhl K (1989) Current protocols in molecular biology. Wiley, New York
4. Bailey MJ, Thompson IP (1992) Detection systems for phylloplane pseudomonads. In: Wellington EM, van Elsas JD (eds) Genetic interactions between microorganisms in the natural environment. Pergamon, Oxford, pp 126–141
5. Barry GF (1988) A broad host range shuttle system for gene insertion into the chromosome of gram negative bacteria. Gene 71: 75–84