Plant Gene and Trait, 2015, Vol.6, No.7, 1-11
10
solitary/plant, no. of secondary branches/plant,
harvesting period and fruit circumference (cm) are the
more effective traits to get better yield and quality.
Improvement of brinjal would be more worthwhile
when we would focus on the index I
134
based on three
characters namely yield/plant (g), no. of fruits in
inflorescence/plant, no. of fruits in solitary/plant.
3 Materials and Methods
3.1 Plant materials
Twenty one brinjal genotypes were collected from
plant genetic resource center of Bangladesh
agricultural research institute, different localities and
certified seed companies.
3.2 Field experiment
The experiment was conducted in botanical garden of
Jahangirnagar University, Savar Dhaka, Bangladesh
during November, 2013 to June, 2014 in randomized
complete block deign (RCBD) with three replications.
Seedling developments as well as all the cultural
practices were done as recommended commercially.
Observations were recorded randomly from five plants
of each genotype in each replication for different
quantitative traits namely plant height (cm), no. of
primary branches/plant,
no.
of secondary
branches/plant, stem diameter (cm), days to first
flowering, days to first fruiting, harvesting period, no.
of fruits in inflorescence/plant, no. of fruits in
solitary/plant, fruit length (cm), fruit stalk length (cm),
fruit circumference (cm), fresh weight/fruit (g),
fruits/plant and yield/plant (g).
3.3 Data analysis
Variance analysis for each character was carried out
separately following to Singh and Chaudhary (1985)
with the mean data of all replications. Genotypic and
phenotypic co-efficient of variations were calculated
according to formula given by Burton (1952) and
Singh and Chaudhary (1985). Broad sense of
heritability as well as genetic advance in percent of
mean were estimated following formula suggested by
Johnson et al. (1955) and Hanson et al. (1956).
Correlation coefficients were computed according to
method suggested by Johnson et al. (1955). Path
coefficients were calculated as suggested by Dewey
and Lu (1959) to estimate the direct and indirect
effects of the characters on fruit yield. Selection
indices were constructed using methods developed by
Smith (1936) based on the discriminant function of
Fisher (1936). Selection indices and their relative
efficiencies in terms of expected genetic advance in
yield were calculated according the method stated by
Singh and Chaudhary (1985). All of the statistical
analysis was done using Indostat and R software.
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