PJB-2017-507
EVALUATION OF CUCUMBER GENOTYPES AGAINST CUCUMBER MOSAIC VIRUS SUBGROUP-I
Sarwat Zahoor
Abstract
Aphid-borne cucumber mosaic virus (CMV) is the present major constraint to successful cucumber production worldwide. Breeding for resistance is the principal approach to manage losses. Resistant source identification to understand its genetic behavior is essential component of this strategy. In the current studies, mechanical inoculation was employed to screen 21 local and exotic cucumber genotypes against CMV Subgroup I. Strip test and RT-PCR was carried out for viral detection along with recording the percent disease incidence and yield related data. All the tested genotypes developed disease symptoms with varying degree of responses. Of the 21 genotypes evaluated using mechanical inoculation, 7 were found to be highly resistant, 6 were resistant, one was moderately resistant, 4 were moderately susceptible and 3 were susceptible. Strip test was positive for all the tested genotypes except for highly resistant genotypes. However, RT-PCR for 6 highly resistant (Akbar hybrid, Summer green, Super green, Beithoalfa, Indian poinsett, Royal Holland and P1-618950) and one susceptible (Ames 26917) genotype confirmed the presence of CMV Subgroup-I in these genotypes. The results presented here clearly demonstrate that sources of resistance to CMV Subgroup-I are available among the tested cucumber genotypes. Identified highly resistant and resistant genotypes having desirable plant and yield characteristics could be used directly in areas having high incidence of CMV. While remaining highly resistant and resistant genotypes could be used to breed resistant genotypes by incorporating their resistance in susceptible genotypes having good agronomic traits to widen genetic base.
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