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STUDIES ON EFFECT OF SUB LETHAL GAMMA RADIATION ON SEED QUALITY AND STORABILITY OF RICE VARIETIES

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Title STUDIES ON EFFECT OF SUB LETHAL GAMMA RADIATION ON SEED QUALITY AND STORABILITY OF RICE VARIETIES
 
Creator VIDYA KUMARI, L
 
Contributor SREEDHAR, M
 
Subject sowing, germinability, storage, rice, enzymes, developmental stages, vegetative propagation, biological phenomena, seed quality, land resources
 
Description Influence of five gamma radiation doses generated from Co60 source of Gamma
chamber 5000 in combination with four popular rice varieties on seed quality
parameters viz., germination percentage, field emergence, speed of germination, peak
value of germination and coefficient of velocity of germination, root, shoot, seedling
length, vigour index, electrical conductivity, dehydrogenase and alpha amylase activity,
seed moisture and seed health was studied immediately after irradiation and up to nine
months under storage at ambient conditions. The experiment was laid out in a
Completely Randomised Design with factorial concept.
Marked significance of interaction effects was recorded for various seed quality
parameters studied immediately after exposing the seed to selected doses of gamma
rays. The results indicated that gamma doses up to 100 Gy were found to exercise
positive influence in enhancing all the germination, seedling and biochemical
parameters in all test varieties viz., Tellahamsa, Sumathi, Swarna and Sambamahsuri.
However, these varieties differed significantly in their response to radiation doses and
registered variable values for seed quality parameters. The doses of 150 Gy and beyond
had detrimental effect by interfering with various seed quality attributes.
The analysis of bimonthly data at four intervals on seed storage potential up to
nine months indicated significant influence of storage period on all the seed quality
parameters including seed health. The interaction effects between storage period,
gamma doses and rice varieties were also highly significant. Marked decline in
germination percentage, seedling dimensions and corresponding vigour index was
noticed over a period of nine months. Field emergence values truly reflected the lab
germination percentages at all bimonthly intervals. However, germination percentage
did not go below 90 per cent which is above the minimum seed certification standard.
The results also indicated that among germination and seedling traits studied, peak
value of germination, vigour index I and shoot length were the most sensitive seed
quality parameters affected by ageing due to storage under ambient conditions. These
attributes registered 16.79, 15.55 and 12.35 per cent mean reduction respectively at the
end of nine months, indicating that these were the most sensitive characters affected
during storage thus, can serve as reliable parameters for assessing seed quality under
the influence of gamma radiation. The electrical conductivity values were also found to
increase significantly at the end of nine months of storage. The study revealed that,
combinations viz., Tellahamsa/ 50 Gy, Sumathi/ 50 Gy, Swarna/ 100 Gy and
Sambamahsuri/ 100 Gy performed better for various germination, seedling,
biochemical, seed moisture and seed health parameters evaluated during storage. The
per se performance of these interactions also indicated their superiority over remaining
treatments for these attributes.
From the results of the study it could be concluded that, gamma doses 50 and 100
Gy showed superiority in influencing all the seed quality parameters positively during
storage. Sambamahsuri and Swarna exhibited better response in desirable direction than
Tellahamsa and Sumathi to irradiation during storage in terms of maintenance of seed
quality. Medium slender grain type rice varieties were found more amenable for storage
after gamma treatment without significant loss in seed quality compared to long slender
types.
 
Date 2016-06-22T15:04:53Z
2016-06-22T15:04:53Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67741
 
Language en
 
Relation D9433;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY