Record Details

Dynamics of anthracnose disease causing pathogen and inheritance and ssr marker- assisted tagging of resistance to anthracnose in chilli

KrishiKosh

View Archive Info
 
 
Field Value
 
Title Dynamics of anthracnose disease causing pathogen and inheritance and ssr marker- assisted tagging of resistance to anthracnose in chilli
 
Creator C, Nanda
 
Contributor A, Mohan Rao
 
Subject fruits, biological phenomena, diseases, fungi, chillies, genetics, planting, yields, cytoplasm, crossing over
 
Description Genetic options are considered as the most economical and sustainable strategies
to reduce losses due to anthracnose disease in chilli. An attempt was made to understand
the dynamics of host-pathogen interaction, inheritance of anthracnose resistance and to
identify DNA markers linked to genomic regions controlling chilli anthracnose resistance
at the Hot Pepper Improvement Unit, Department of Genetics and Plant Breeding,
University of Agricultural Sciences, GKVK, Bengaluru during 2006-2010.
Anthracnose disease in chilli was prevalent in all the surveyed districts of
Karnataka and Andhra Pradesh. Colletotrichum spp. isolates were identified
unambiguously as Colletotrichum capsici (Cc) and Colletotrichum gloeosporioides (Cg)
based on conidial shape. DNA-based assay using ITS and AFLP markers supplemented
morphological trait-based assay for delineating species identity of Colletotrichum
isolates. Both Cg and Cc were equally frequent in the surveyed chilli growing regions.
The isolates ‘Cc 38’ and ‘Cg 33’ sampled from Khammam district of Andhra Pradesh
were found most virulent.
The SSR marker HpmsE081 was found significantly linked with genomic regions
controlling resistance to anthracnose caused by ‘Cc 38’. However, the association
appeared to be very weak as suggested by low contribution of marker variance coupled
with low heritability. Fewer to large number of genes, respectively were involved in
controlling resistance to anthracnose caused by ‘Cc 38’ and ‘Cg 33’. Fewer numbers of
genes with decreasing effects and complementary gene interactions appeared to control
the inheritance of number of fruits per plant and fruit length. Large number of genes with
decreasing effects and complementary gene interactions appeared to control the
inheritance of fruit yield per plant and average fruit weight. A × R crosses were
comparable to B × R crosses in terms fruit yield and its contributing traits and had higher
levels of anthracnose resistance to virulent isolate ‘Cc 38’.
 
Date 2016-05-14T11:15:22Z
2016-05-14T11:15:22Z
2011-09-03
 
Type Thesis
 
Identifier Th-10111
http://krishikosh.egranth.ac.in/handle/1/65982
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences, Bengaluru