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20062
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Subject: Seed Science and Technology × End date: 2006 × Start date: 2006 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Characterization and vigour assessment of cluster bean (Cyamopsis tetragonoloba (L.) Taub.)
    (CCSHAU, 2006) Rana, Rakesh; Deswal, D.P.
    A study was conducted on “Characterization and vigour assessment of cluster bean (Cyamopsis tetragonoloba (L.) Taub.)” by applying some field and laboratory tests. Plant morphological characters like plant growth habit, leaf pubescence, leaf margin, flower colour and pod shape were found to be most important diagnostic characters for cultivar identification in cluster bean. Some other character such as number of pod per cluster, days to 50 per cent flowering and pod size were also helpful in identification but cannot be referred as reliable trait for cultivar identification because of effect of location and management. Some seed morphological characters like 100-seed weight and seed shape were also found helpful to differentiate the cluster bean cultivars. The differential response of cluster bean cultivars to different chemical tests such as phenol test, peroxidase test, KOH-bleach test and potassium hydroxide test was found to be accurate means of classification which shows the reliability and quickness of these chemical tests. The schematic diagram on the basis of morphological traits has higher resolution in terms of differentiating among the genotypes. On the other hand the laboratory tests though not so laborious but has less resolving capacity to differentiate among genotypes. The significant mean sums of squares due to genotypes for all the seed vigour parameters revealed the existence of sufficient amount of variability. The correlation study showed the significant and positive association among all the seed quality parameters except electrical conductivity, which showed negative association with other quality parameters.
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    ThesisItemOpen Access
    Effect of priming on seed quality in pigeonpea. (Cajanus cajan L. millsp.)
    (CCSHAU, 2006) Ashok Kumar; Kashyap, R.K.
    Experiment was conducted to study the effect of priming on seed quality in pigeonpea and also to study the various enzyme activities. To undertake this study two improved variety viz. Manak and Paras were studied. Each variety was grouped into two seed lots on the basis of germination i.e. L1 good seed lot L2 marginal seed lot. It was observed that marginal seed lot L2 performed better after applying pre-sowing treatments under laboratory and field condition. And among varieties, Paras performed better in field condition than Manak in all the priming treatments. Among all the treatment only GA3 (50ppm), cold hydration and cold dehydration +0.25% thiram showed positive results in both the varieties and lots. Treatment cold dehydration +0.25% thiram showed highest improvement in germination, vigour index-I, plumule length and dry weight in both the seed lots. An effort was also made to enhance the germination of marginal seed lot by applying CaCl2 and KNO3 priming treatments but the experiment showed negative results in both the treatments in pigeonpea. It was revealed that variety Manak was showed good enzyme activities than the Paras. And among seed lots lot L1 showed good enzyme activities than lot L2.