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|Title: ||Genetic diversity and evacuation of advanced lines for resistance to downy mildew (Psuedopernospora cubensis) diseases in cucumber [Cucumis sativus]|
|Authors: ||R, Veena|
|Guide/Chairperson: ||Amrik Singh Sidhu|
|Issue Date: ||2011|
|Year of Submission: ||2011|
|Abstract: ||An investigation was under taken to assess the genetic diversity, heritability, genetic
advance, morphological and molecular characterization and screening for downy mildew
disease resistance in advanced lines was conducted at IIHR, Bangalore, during 2010-
2011. To assess the genetic variability and diversity of 38 genotypes of diverse origin
were tested for 17 quantitative morphological traits. Genotypic and phenotypic variation
was high for node at first female and male flower appear and yield per plant. High
heritability coupled with genetic advance over mean was recorded for node at first female
flower appears and yields per plant. Fruit yield had positive and highly significant
association phenotypically and genotypically with 100 seed weight, vine length, number
of fruits per plant and flesh thickness. Vine length, number of fruits per plant and flesh
thickness had positive and direct genotypic and phenotypic effects on fruit yield per plant.
The cucumber lines were analysed by using 13 RAPD primers those produced 103 DNA
markers bands. A total of 67 polymorphic bands were obtained with a mean of 5.15 bands
per primer. The cluster drawn out of the distance matrix grouped various genotypes in to
two major cluster as A and B, than again major cluster A is sub divided in to A1 to A9.
The highest dissimilarity percentage was between genotypes IIHR-409-2 and 595920.
The genotypes Swarna Ageti, Sangeeta, Nandini, Barsati, Ajax, VR-101, VR-06-07,
IIHR-405, Karur Local IIHR-407-1, and IIHR-409-2 were found to be moderately
resistant and Cucumis hardiwickii showed highly resistant to the downy mildew disease.|
|University in which they received their degree: ||University of Agricultural Sciences, Bangalore|
|Degree Level: ||M.Sc|
|Appears in Collections:||DIVISION OF VEGETABLE CROPS|
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