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QUALITY HYBRID SEED PRODUCTION BY REGULATION OF SEX EXPRESSION IN CASTOR (Ricinus communis L.)

KrishiKosh

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Title QUALITY HYBRID SEED PRODUCTION BY REGULATION OF SEX EXPRESSION IN CASTOR (Ricinus communis L.)
 
Creator SUJATHA, v
 
Contributor ANKAIAH, R
 
Subject QUALITY, HYBRID, SEED, PRODUCTION, REGULATION, SEX, EXPRESSION, CASTOR
 
Description In the present investigation, the parental lines of DCH-177 hybrid i.e.,
DPC-9 (female line) and DCS-9 (male line) were sown at 3:1 ratio in three different
dates. The seed parents, DPC-9 was studied in order to know the influence of
environment (September, October, November sowings) and growth regulators on
sex expression and hybrid seed quality. The experiment was taken up during rabi,
2005 at National Seed Project, Acharya N.G. Ranga Agricultural University,
Rajendranagar, Hyderabad. The experiment was laid out in Randomised Block
Design in three replications.
The environment (dates of sowing) showed significant effect on sex
expression. September 16th sowing recorded more number of pistillate plants with
less number of interspersed staminate flowers followed by October 16th sowing,
whereas sowings done in November had very little influence on sex expression with
less number of pistillate plants/plot. Ethrel treatment enhanced the expression of
pistillate flowers by suppression of interspersed staminate flowers while reverse was
true with the GA3 which promoted ISF.
October sown crop recorded higher plant height, 100 seed weight and length
of primary spike as compared to November and September sown crops. November
sown crop recorded early flowering and early maturity when compared with
September and October sowings while September sown crop recorded maximum
seed yield which was significantly superior to November and October sowings.
Ethrel treatment recorded minimum plant height however recorded maximum spike
length, 100 weed weight and maximum seed yield while GA3 treatment recorded
maximum plant height and early maturity.
Seed quality parameters like germination per cent, seedling vigour index and
field emergence index were recorded high in the seed obtained from September and
October sowings as compared to November sowing. Hybrid seed obtained from
September and October sown crops recorded high genetic purity and it was above
certification standard (>85%) while seed obtained from November sown crop had
very low genetic purity and it was below certification standard.
Ethrel treatment enhanced the quality of the seed quality parameters as
compared to GA3 treatment, water spray and control. Manual removal of ISF in seed
parent during seed production resulted in higher genetic purity (95.9 %) and it was
on par with Ethrel treatment (94.0-96.2%). Ethrel treatment resulted in high genetic
purity of hybrid seed due to suppression of ISF and maintenance of stable pistillate
plants, while seed obtained from GA3 sprayed plots recorded very low genetic purity
(70.1-78.8%) as a result of more number of ISF in seed parent. It was concluded that
September and October sowings were congenial for quality hybrid seed production.
Ethral @ 0.1% was found very effective for obtaining better quality seed by
suppression of ISF in seed parent.
 
Date 2016-08-16T14:34:50Z
2016-08-16T14:34:50Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/72611
 
Language en
 
Relation D7842;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD