Indian Society of Genetics & Plant Breeding

Identification of new resistant sources against downy mildew disease from a selected set of cucumber germplasm and its wild relatives

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This study was undertaken to identify new sources of
resistance against downy mildew of cucumber caused by
Pseudoperonospora cubensis [(Berk. and Cart.) Rostow].
Pot experiments were conducted with 16 accessions each
Cucumis sativus and C. hardwickii during the years 2017
and 2018 using 12 isolates of
P. cubensis representing
different agroclimatic zones of India. The accession,
IC331627 from Dehradun, Uttarakhand showed plant
disease index (PDI) ranging from 5.55-20.35 per cent with
an average PDI of 11.56 and 11.87 per cent during the years,
2017 and 2018, respectively. Hence, IC331627 was identified
to be resistant against the five isolates of
P. cubesis (Pc12,
Pc17, Pc19, Pc21 and Pc24) and moderately resistant
against one isolate (
Pc22). This resistant accession C.
(IC331627) could be utilized to develop mapping
population to map genomic regions conferring the
resistance to downy mildew in cucumber.

Keywords: Resistant sources; P. cubensis; cucumber; wild relatives


Year: 2020
Volume: 80
Issue: 4
Article DOI: 10.31742/IJGPB.80.4.8
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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