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EFFECT OF GA3 ON SEED TECHNOLOGICAL ASPECTS OF IR 58025 A - A POPULAR FEMALE PARENTAL LINE OF RICE HYBRIDS

KrishiKosh

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Title EFFECT OF GA3 ON SEED TECHNOLOGICAL ASPECTS OF IR 58025 A - A POPULAR FEMALE PARENTAL LINE OF RICE HYBRIDS
 
Creator NARAHARI RAMARAJU
 
Contributor MANOHAR REDDY, N
 
Subject GA3, SEED, TECHNOLOGICAL, ASPECTS, IR 58025 A, FEMALE, PARENTAL, LINE, RICE, HYBRIDS
 
Description The present study was conducted in rice to evaluate the efficacy and dosage
of commercial and laboratory grade GA3 on IR 58025 A, a popular female parental
line for majority of rice hybrids developed in India. The experiment was laid out in
split plot design with two spraying schedules as main treatments and six dosages of
GA3 as sub treatments. The seed harvested from A-line was subjected to accelerated
ageing for different durations to assess the influence of GA3 on seed storability.
Analyses of variance indicated significant differences for plant height (cm), days to
50% flowering, number of productive tillers per hill, panicle exsertion (%), seed set
(%) and single plant yield (g). The influence of GA3 on 100 seed weight and L/B
ratio was meagre.
The dosage of 90g GA3/ha in combination with 1% boric acid had synergistic
and incremental influence on traits viz., plant height, panicle exsertion (%), seed
set (%) and ultimately single plant yield particularly with the spraying schedule of
40:30:30% GA3 on 1st, 3rd and 5th day of 5% panicle emergence. Highest panicle
exsertion of 78% and seed set of 48.6% were recorded in this combination, which
has ultimately resulted in highest (6.48 g) single plant yield.
The results indicated a marginal difference in the effect of laboratory grade
GA3 and commercial grade GA3, which can be profitability exploited by the farmers,
since commercial grade GA3 is available at a cheaper rate. However, application of
GA3 was found to exercise a declining influence on seed quality parameters in seed
lots subjected to accelerated ageing except electrical conductivity. This negative
influence of GA3 could be attributed to irreversible changes in membrane dynamics
and slow mobilization of energy reserves. Such a decline in these parameters was
commensurate with higher electrical conductivity as a result of increased leachates
under the influence of GA3 and accelerated ageing. However, the ill effect of GA3 on
seed quality can be circumvented by disposing the hybrid seed in the following
season due to high demand.
 
Date 2016-07-30T14:21:18Z
2016-07-30T14:21:18Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70312
 
Language en
 
Relation D8329;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD