Exclusion of viroids from potato resources and the modified use of a cDNA probe1
作者:
P. S. HARRIS,
C. M. JAMES,
期刊:
EPPO Bulletin
(WILEY Available online 1987)
卷期:
Volume 17,
issue 1
页码: 51-60
ISSN:0250-8052
年代: 1987
DOI:10.1111/j.1365-2338.1987.tb00007.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Threats from potato spindle tuber viroid (PSTV) to potato breeding and centralized elite seed‐tuber production have been identified in world potato genetic resources. In the UK effective diagnostic testing has proved essential in preventing acquisition. Inoculation of potato nucleic acids to tomato and subsequent viroid detection by polyacrylamide gel electrophoresis (PAGE) has proved a sensitive, but cumbersome, test over 8 years. Additionally, over 2 years,32P‐labelled PSTV cDNA was used to probe denatured sap and nucleic acid extracts: 10‐4of peak viroid concentrations in tissue could be detected. Spurious positives were seen in particular circumstances, but could be avoided. Probing of non‐denatured samples was not as sensitive. Tubers became infected and PSTV was readily detected by PAGE in leaves of potato experimentally inoculated and maintained below 20°C, but the cDNA probe could not detect infection in tuber sprouts growing at 8–10°C in darkness. Otherwise similar green‐leaved sprouts were faintly positive. Detection for all sprouts was unproblematic after movement to 25°C and lig
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