Abstract
To clone cDNAs of mRNA specifically expressed at the infection sites, we applied the polymerase chain reaction (PCR) combined with pricking microinjection to barley coleoptile epidermis inoculated with powdery mildew pathogen. In essence, first-strand cDNAs were synthesized in situ the needle-pricked epidermal cells in which fungal haustoria had formed, and were subsequently amplified by PCR with synthetic primers. The amplified DNAs were subcloned into a plasmid vector for the construction of a cDNA library. The antisense RNAs were in vitro-transcribed from subcloned DNAs, labelled, and introduced into pathogen-invaded coleoptile epidermal cells by pricking microinjection. Target cell-specific cDNAs were identified by a specific in situ hybridization in the pathogen-invaded cells. This technique was also applied to the amplification and identification of cDNAs which were reverse-transcribed from mRNAs of targeted infection structures of the powdery mildew pathogens inoculated onto barley coleoptile epidermis.
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Communicated by J. M. Widholm
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Matsuda, Y., Toyoda, H., Kurita, A. et al. In situ PCR technique based on pricking microinjection for cDNA cloning in single cells of barley coleoptile and powdery mildew pathogen. Plant Cell Reports 16, 612–618 (1997). https://doi.org/10.1007/BF01275501
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DOI: https://doi.org/10.1007/BF01275501