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Identification and confirmation of downy mildew (Pseudoperonospora cubensis Berk. & Curt.) resistance sources in cucumber (Cucumis sativus L.)

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Title Identification and confirmation of downy mildew (Pseudoperonospora cubensis Berk. & Curt.) resistance sources in cucumber (Cucumis sativus L.)
 
Creator J. C. Bommesh
M. Pitchaimuthu ·
A. T. Sadashiva
S. Sriram
B. Varalakshmi
K. V. Ravishankar
 
Subject Cucumber · Detached leaf assay · Downy mildew · Haemocytometer · Sporulation
 
Description An experiment was designed to identify the resistance source for downy mildew disease in different genotypes of cucumber.
Forty-one cucumber genotypes were screened under natural condition and also under artificial epiphytic condition using
detached leaf assay method. Genotype IIHR-438 and Cucumis metuliferus L. showed field resistance with an average PDI
of 17.66 and 17.46; AUDPC of 772.24 and 764.48, respectively compared to 73.12 PDI and AUDPC of 3096.64 in highly
susceptible genotype of IIHR-389. The disease reaction in selected genotypes of cucumber confirmed by artificial screening
was in accordance with disease reaction under natural conditions. Resistant genotype IIHR-438 (14.3 PDI) and C. metuliferus
L. (12.8 PDI) had least average PDI as compared to susceptible check Swarna Agethi (58.00 PDI) under artificial
condition. Statistical analysis of disease severity data over a period for all the forty-one genotypes using non-linear growth
model revealed that 99% variability in disease progression. Screening of genotypes under field conditions, sporulation of
pathogen, progress of disease, detached leaf assay and non-linear statistical analysis implied that none of genotypes were
found to be immune to downy mildew. Wherein the genotype, IIHR-438 and wild cucumber (C. metuliferus L.) were found
resistant to downy mildew disease. Hence, it can be utilized in breeding program to develop resistant cultivar in cucumber
against Pseudoperonospora cubensis under tropical conditions of India.
 
Date 2019-04-24T08:03:30Z
2019-04-24T08:03:30Z
2018-09-05
 
Type Research Paper
 
Identifier ISSN 0367-973X
http://krishi.icar.gov.in/jspui/handle/123456789/18816
 
Language English
 
Publisher Springer