physicochemical

ABSTRACTS
inoculated wit 10 8 spores/ml inoculam concentration.
There was an increase in the infection of onion by
Alternatira porri with the increase in the inoculam
concentration. The infection of onion by Alternaria porri
was maximum when inoculated leaves were incubated
at 25 0 C. The infection of onion by Alternaira porri was
maximum when inoculated leaves were incubated under
continuous light (24 h) followed by alternate darkness
and light. The infection of onion by Alternaira porri was
maximum when inoculated leaves were incubated at 95
per cent relative humidity followed by 90 and 100 per
cent. The infection of onion by honge (Pongamia pinnata)
and Kashmir bouquet (Clerodendron inerme) were the
mot effective in inhibiting the mycelia growth and spore
germination of Alternaria porri, where as leaf extract of
sitaphal (Annona squamosa) was found to be less
effective. Increase in the inhibition of growth and spore
germination of Alternaria porri was observed with
increase in the concentration of the plant extracts used.
Trichoderma viride was most effective in
inhibiting the growth and spore germination of Alternaria
porri. This was followed by Trichoderma harzianum,
Trichoderma koningii, Trichoderma resei and
Pseodomonas Flurecenes.
All the four fungicides viz., difenonazole,
mancozeb, copperoxychloride and chlorothalonil were
significantly effective in inhibiting the mycelia growth and
spores germination of Alternaria porri under in vitro
conditions.
Difenconazole at 200 ppm, mancozeb at 100
ppm, copper oxychloride and chlorithalonil at 1000 ppm
were effective in inhibiting the mycelia growth and spore
germination of the Alternaria porri.M.Sc (Ag), 2008
Stability analysis for yield and yield component characters in soybean
(Glycine max (L.) Merrill)
Student: V. Saida Naik Major Advisor: Dr. M. V. Ramana
Department of Genetics and Plant Breeding
The present study was conducted during Kharif
(E1), rabi (E2) and late rabi (E 3
), 2006 at Regional
Agricultural Research Station, Lam, Guntur with 12
genotypes of soybean (Glycine max (L.) Merrill) over
three environments to study the genotypes –
environment interaction, variability, heritability and
genetic advance, the association between yield and its
component traits and direct and indirect effects of
different component traits on seed yield per plant.
The analysis of variance revealed significant
difference among the genotypes for all the characters
studied. The heritability values were high for days to
maturity in environment I, II and III, biological yield per
plant in environment II and III, seed yield per plant in
environment I and II and plant height in environment II
and III, where as expected genetic advance was high for
seed yield per plant in environment I and II, biological
yield per plant in environment II and III, number of
branches per plant in environment I and II.
The analysis of virance (Eberhart & Russell,
1966) revealed that mean sum of squares due to
genotypes was significant for all characters except for
number of pods per plant, 100 seed weight, protein
content (showed significant when tested against pooled
deviation) and harvest index (showed significant when
tested against pooled error) when tested against both
pooled error and pooled deviation. Genotypes –
environment interaction was significant for all the
characters studies, except for number of seeds per pod
100 seed weight, protein content, oil content and harvest
index when tested against both pooled error and pooled
deviation.
The mean sum of squares due to environment
was also highly significant for all characters, except
number of seeds per pod, 100 seed weight and oil
content when tested aganst pooled error and pooled
deviation. The genotypes – environment interaction was
non significant for all the characters except for plant
height (when tested against both pooled error and
pooled deviation). The mean sum of square due to
environment (linear) was significant for all the character
except number of seeds per pod, 100 seed weight and
oil content when tested against both pooled error and
polled deviation. While genotypes – environment (linear)
component on interaction was non significant for all
characters except days to 50% flowering, days to maturity
and plant height (when tested against both pooled error
and pooled deviation). Non linear component of G X E
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