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STUDIES ON SEED DEVELOPMENT, MATURATION AND SEED QUALITY ENHANCEMENT IN OKRA [Abelmoschus esculentus (Moench) L.]

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Title STUDIES ON SEED DEVELOPMENT, MATURATION AND SEED QUALITY ENHANCEMENT IN OKRA [Abelmoschus esculentus (Moench) L.]
 
Creator JAGADISH HOSAMANI
 
Contributor V.K.Pandita
 
Subject sowing, developmental stages, germinability, drying, vegetables, seed treatment, harvesting, sugar, land resources, tolerance
 
Description T-8104
Okra seeds of Pusa A-4 cultivar were harvested 10, 17, 24, 28, 32, 36 and 40
days after anthesis (DAA). Seeds were immediately shelled by hand a part of freshly
harvested seeds were analyzed for moisture content, leachate conductivity, seed dry
weight and seed germination. Other part of the freshly harvested seeds at each sampling
date were also subjected to rapid desiccation to identify the stage at which desiccation
tolerance occurred. No seeds were able to germinate until 17 DAA. As soon as seeds
began to germinate at 28 DAA, the percentage of hard seeds increased as seed moisture
content decreased. At 40 DAA when seed moisture content dropped to around 8%, 20%
and 26% fresh and rapidly dried seeds, respectively tested were hard seeded. Maximum
seed germination in fresh developing seeds was attained at 36 DAA, when
physiological maturity and maximum seed dry weight were attained. With seed
maturation, there were rapid decline in leachate conductivity and seed moisture content.
The desiccation tolerance in fresh okra seeds was attained after 28 DAA and after this
stage, non-reducing sugar concentration increased many fold.
One of the major problem of okra growers is difficulty in obtaining proper
seedling emergence under low temperature. Solid matrix seed priming (SMP) was
performed by mixing seed with moist Vermiculite for 6, 12, 18, 24, 30, 36 and 48 h
incubation at 20°C and 25°C. Based on seed germination, speed of germination and
seedling vigour parameters, solid matrix priming for 24 h duration at 20°C was
optimum for improving seed quality in okra cv Pusa A-4. Solid matrix priming followed
by coating with Trichoderma viridae and T harzianum improved germination by 18.3
and 18.7 percent , respectively at 15°C.Coating seed with bio-agents like Trichoderma
viridae and T harzianum after SMP significantly improved speed of germination and
seedling vigour over unprimed seeds. SMP followed by coating of Trichoderma viridae
improved field emergence of okra seed by 33% over unprimed control. Field
Emergence Index and 25 days old seedling growth and vigour was significantly higher
in solid matrix primed seed coated with bio-agents. The results indicate that solid matrix
priming along with coating of bio-agents like Trichoderma viridae and T harzianum
improves field emergence and seedling growth in okra. SMP can be effectively
employed to prime large amount of okra seed at one time. It is also cost effective as the
medium can be re-used many times.
 
Date 2016-12-16T12:10:14Z
2016-12-16T12:10:14Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/90553
 
Format application/pdf
 
Publisher IARI, DIVISION OF SEED SCIENCE AND TECHNOLOGY