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Subject: Seed Science and Technology × Author: Nisha × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Seed quality assessment in naturally aged seed of sorghum [Sorghum bicolor (L.) Moench]
    (CCSHAU, 2019) Nisha; Jakhar, S.S.
    Two sorghum variety produced during kharif seasons were evaluated for their performance for different viability and vigour parameters viz. test weight, seed density, standard germination, seedling length, seedling dry weight, vigour Index-I, vigour Index-II, tetrazolium test, electrical conductivity, dehydrogenase activity test, seed mycoflora, speed of emergence index, mean emergence time and seedling establishment (%). Significant amount of variation was observed in both of the varieties and all the seed lots for all characters. In natural aged seed lots, only HJ541 variety of sorghum sustained their germination up to one year showed that sorghum seed can be stored at ambient condition up to one year without loosening its viability and after that the germination falls below standard. HJ541 was found superior variety based on majority of the viability and vigour parameters results whereas HC136 was found inferior. During natural ageing, standard germination, seed density, test weight, seedling length, vigour indices, viability, speed of emergence index and seedling establishment decreased significantly and progressively with the ageing period. The activity of DHA decrease significantly with storage period in both the varieties. Electrical conductivity was found significantly & negatively correlated with standard germination, indicating that the more the EC value lower will be the germination in laboratory as well as in the field and vice- versa. Priming of the seeds with various treatments was found effective to improve the seed quality in fresh as well as marginal seed lot i.e. one year seed lot. GA3 (50ppm for 6 hrs.) was found better priming treatment for enhancing the quality followed by hydration- dehydration (6hrs.) + 0.25% thiram treatments. All the priming treatments showed maximum effect on HJ541 followed by HC136. Therefore, from present investigation it is concluded that the standard germination, vigour indices and EC could be used as reliable predictors of seed quality because of easy, quick and accurate in their execution. Various seed priming treatments can be used for enhancing seed quality of marginal seed lot.