Screening of Chilli Genotypes for Resistance to Bacterial Wilt and Mosaic
By: Fatima A G.
Contributor(s): Salikutty Joseph (Guide).
Material type:
BookPublisher: Vellanikkara Department of Olericulture, College of Horticulture 1999DDC classification: 635.6 Online resources: Click here to access online Dissertation note: MSc Abstract: The investigation on "Screening of chilli (Capsicum annuum L.) genotypes for
resistance to bacterial wilt and mosaic" was conducted at the vegetable research farm of
Department ofOlericulture, College of Horticulture, Vellanikkara during 1997-'98.
Fifty three chilli accessions collected from various parts of the country and abroad
were evaluated in the wilt sick soil. The level of resistance to bacterial wilt varied with the
accessions, Out of the 53 accessions tested, 15 were resistant, 16 were moderately resistant,
13 were moderately susceptible, and the remaining nine were highly susceptible. Among
the 15 resistant accessions nine were short fruited, five were long fruited and remaining one
was medium long fruited. The chilli lines were catalogued as per the IBPGR descriptor.
The extent of genetic variability for 13 characters viz. plant height, plant spread, days to
first flower, days to first harvest, fruit length, fruit girth, pedicel length, number of fruits per
plant, average fruit weight, fruit yield per plant, driage, number of harvests and total
. duration were studied. The genotypic and phenotypic coefficients of variation, heritability,
genetic advance and genetic gain were estimated.
Significant differences were observed among the 53 genotypes for almost all the
characters studied. Among the 53 genotypes the earliest flowering (59 days) genotype was
CA 715 and the highest yielding (352.75 g) genotype was CA 728. CA 731 recorded the
maximum number of fruits (108.50) per plant. High heritability coupled with high genetic
gain was observed for the characters - fruit length, fruit girth, number of fruits per plant,
average fruit weight and fruit yield per plant. The highest positive correlation with yield
was expressed by the total duration. Average fruit weight exhibited the highest positive
direct effect on yield. Based on the genetic divergence the 53 genotypes were grouped into seven clusters.
Out of 53 accessions evaluated for mosaic resistance, nine were resistant, twelve
moderately resistant and the remaining 32 were susceptible. The resistance showed by the
nine accessions was confirmed by standard methods. The accessions CA 337, CA 731, CA
738, CA 739 and CA 744 were found to possess the resistance to both bacterial wilt and
mosaic and can be recommended for disease prone areas. The F IS developed using the
resistant parents were found susceptible to both bacterial wilt and mosaic.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
|
KAU Central Library, Thrissur Theses | 635.6 FAT/SC (Browse shelf) | Available | 171456 |
MSc
The investigation on "Screening of chilli (Capsicum annuum L.) genotypes for
resistance to bacterial wilt and mosaic" was conducted at the vegetable research farm of
Department ofOlericulture, College of Horticulture, Vellanikkara during 1997-'98.
Fifty three chilli accessions collected from various parts of the country and abroad
were evaluated in the wilt sick soil. The level of resistance to bacterial wilt varied with the
accessions, Out of the 53 accessions tested, 15 were resistant, 16 were moderately resistant,
13 were moderately susceptible, and the remaining nine were highly susceptible. Among
the 15 resistant accessions nine were short fruited, five were long fruited and remaining one
was medium long fruited. The chilli lines were catalogued as per the IBPGR descriptor.
The extent of genetic variability for 13 characters viz. plant height, plant spread, days to
first flower, days to first harvest, fruit length, fruit girth, pedicel length, number of fruits per
plant, average fruit weight, fruit yield per plant, driage, number of harvests and total
. duration were studied. The genotypic and phenotypic coefficients of variation, heritability,
genetic advance and genetic gain were estimated.
Significant differences were observed among the 53 genotypes for almost all the
characters studied. Among the 53 genotypes the earliest flowering (59 days) genotype was
CA 715 and the highest yielding (352.75 g) genotype was CA 728. CA 731 recorded the
maximum number of fruits (108.50) per plant. High heritability coupled with high genetic
gain was observed for the characters - fruit length, fruit girth, number of fruits per plant,
average fruit weight and fruit yield per plant. The highest positive correlation with yield
was expressed by the total duration. Average fruit weight exhibited the highest positive
direct effect on yield. Based on the genetic divergence the 53 genotypes were grouped into seven clusters.
Out of 53 accessions evaluated for mosaic resistance, nine were resistant, twelve
moderately resistant and the remaining 32 were susceptible. The resistance showed by the
nine accessions was confirmed by standard methods. The accessions CA 337, CA 731, CA
738, CA 739 and CA 744 were found to possess the resistance to both bacterial wilt and
mosaic and can be recommended for disease prone areas. The F IS developed using the
resistant parents were found susceptible to both bacterial wilt and mosaic.
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