Raji Varghese
Standardisation of Selection Criteria For Cocoa Hybrids - Vellanikkara Department of Plant Breeding and Genetics, College of Horticulture 1998
Investigation on standardisation of selection criteria for cocoa hybrids
was conducted at Cadbury-KAU Co-operative cocoa Research Project
(CC RP) Farm of Kerala Agricultural University, Vellanikkara during 1994-96.
Twenty nine hybrids grown under Progeny Trial I and their 18 parents
maintained in CYT-I were used for the study.
The influence of seedling height and girth on yield was more
pronounced in the case of seedlings one year after sowing than with those
of 4 mas, 5 mas and 6 mas. The vegetative vigour measured by the height
and diameter of trunk was found to be better correlated with precocity.
The correlation coefficients of pod characters viz., length, width and
weight of pods, number of beans, wet bean weight and pericarp thickness
and seed characters viz., length, width, thickness and dryweight worked out
between hybrids and female parents showed significant relationship in the
case of pod length (r = 0.649) and number of beans (r = 0.606). But with
mid parental value, the hybrids showed high correlation for the characters
pod length, pod weight, number of beans, seed length, seed width and seed
thickness (0.65, 0.45, 0.86, 0.70, 0.76 and 0.70 respectively).
Heritability estimated by regressing offspring on female parent was
high for the characters pod width, seed length and seed width (0,7, 0.64
and 0.78 respectively).
Among the 29 hybrids studied, the hybrid H-4 of the cross
GI 10.3 x GVI 54 was found to be promising in terms of both pod
and wet bean yield.
With the seedling characters of hybrids taken one year after sowing,
a multiple regression equation for wet bean yield was fitted as:
Y = 43 + 0.195 x1 + 3.70 X2
Where, x1 and X2 are height and girth of one year old seedlings respectively.
This can be taken as a seedling selection criteria for cocoa hybrids.
630.28 / RAJ/ST
Standardisation of Selection Criteria For Cocoa Hybrids - Vellanikkara Department of Plant Breeding and Genetics, College of Horticulture 1998
Investigation on standardisation of selection criteria for cocoa hybrids
was conducted at Cadbury-KAU Co-operative cocoa Research Project
(CC RP) Farm of Kerala Agricultural University, Vellanikkara during 1994-96.
Twenty nine hybrids grown under Progeny Trial I and their 18 parents
maintained in CYT-I were used for the study.
The influence of seedling height and girth on yield was more
pronounced in the case of seedlings one year after sowing than with those
of 4 mas, 5 mas and 6 mas. The vegetative vigour measured by the height
and diameter of trunk was found to be better correlated with precocity.
The correlation coefficients of pod characters viz., length, width and
weight of pods, number of beans, wet bean weight and pericarp thickness
and seed characters viz., length, width, thickness and dryweight worked out
between hybrids and female parents showed significant relationship in the
case of pod length (r = 0.649) and number of beans (r = 0.606). But with
mid parental value, the hybrids showed high correlation for the characters
pod length, pod weight, number of beans, seed length, seed width and seed
thickness (0.65, 0.45, 0.86, 0.70, 0.76 and 0.70 respectively).
Heritability estimated by regressing offspring on female parent was
high for the characters pod width, seed length and seed width (0,7, 0.64
and 0.78 respectively).
Among the 29 hybrids studied, the hybrid H-4 of the cross
GI 10.3 x GVI 54 was found to be promising in terms of both pod
and wet bean yield.
With the seedling characters of hybrids taken one year after sowing,
a multiple regression equation for wet bean yield was fitted as:
Y = 43 + 0.195 x1 + 3.70 X2
Where, x1 and X2 are height and girth of one year old seedlings respectively.
This can be taken as a seedling selection criteria for cocoa hybrids.
630.28 / RAJ/ST