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Subject: Seed Science and Technology × Author: Jhamb, Rahul × End date: 2009 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Seed quality assessment in desi cotton (Gossypium arboreum L.)
    (CCSHAU, 2008) Jhamb, Rahul; Dahiya, O.S.
    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.