Seed quality assessment in desi cotton (Gossypium arboreum L.)
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Date
2008
Authors
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Publisher
CCSHAU
Abstract
In the present investigation, twenty seed lots of desi cotton
variety viz., HD-123 was taken and divide into two groups
(having 10 lots each) on the basis of germination percentage.
The lot which showed germination percentage above Indian
Minimum Seed Certification Standard (65.0 per cent) of cotton
were termed as good seed group (A) and which showed
germination percentage less than Indian Minimum Seed
Certification Standard (65.0 per cent) of cotton were termed as
marginal seed group (B). All the twenty seed lots of both the
groups were subjected to various viability, vigour and
biochemical tests and observations were recorded on standard
germination, speed of germinaion, vigour index – I , vigour
index – II, electrical conductivity, accelerated ageing,
tetrazolium test, lipid peroxidation, catalase, superoxide
dismutase, dehydrogenase activity, seedling establishment,
mean emergence time and field emergence index. Results
revealed that significant mean sum of squares and ‘t’ –
calculated values showed the wide variation among the seed
lots for all parameters studied. The lot 9th showed the highest
mean value for all parameters except lipid peroxidation and
electrical conductivity; on the other hand lot 20th has lowest
mean values for most of parameters except lipid peroxidation
and electrical conductivity. Superoxide dismutase and catalase
are antioxidant enzymes and positively associated with seed
quality where as lipid peroxidation had adverse effect on seed
quality. There is no change in seed storage protein profile of
good and marginal seed lots. An effort was also made to
enhance the value of marginal seed lots by giving priming
treatments. It was revealed that priming with water
(hydration-dehydration) significantly, improve the standard
germination speed of emergence, seedling establishment and
mean emergence time by boosting the repair mechanism of
seed. On the other hand, GA3 acid and ascorbic acid has
adverse effect on seed quality.
Description
Keywords
Irrigation, Fertigation, Fruits, Potassium, Yields, Fertilizers, Crops, Nutrients, Trickle irrigation, Marketing