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M. Sc. Dissertations

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2010 - 20113
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Subject: Botany × End date: 2011 × Start date: 2010 × Type: Thesis ×
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    ThesisItemOpen Access
    Studies on salinity tolerance in clusterbean [Cyamopsis tetragonoloba (L.) Taub.] genotypes
    (CCSHAU, 2010) Suraj Kala; Goyal, S.C.
    The present investigation was aimed to find out the salinity tolerant genotype of clusterbean [Cyamopsis tetragonoloba (L.) Taub.] using various physiological parameters and to detect the polypeptide pattern of radicle and plumule of tolerant genotype. Thirteen genotypes of guar (HG-75, HFG-119, HG-182, HG-258, FS-277, HG-365. HG-563, HG-867, HG-870, HG-884, HG-2-20, PNB, HG-2-30) were grown in Petri plates containing five salinity levels viz. 0 (control), 4, 8, 12 and 16 dSm-1. Results revealed that progressive increase of salinity levels not only decreased the imbibition rate at 2 and 12 h of imbibition but also declined the per cent seed germination as well as the speed of germination (maguire index). Effective reduction in seed germination was detected in genotype HG-258 at higher (16 dSm-1) level of salinity. However, genotype HG-2-20 showed 100 per cent germination at all the levels of salinity. A progressive increase in salinity levels caused the decrease in plumule length, vigour index, dry weight and relative water content of radicle as well as plumule while on the other hand radicle length and dry weight of cotyledonary leaf was enhenced. The maximum enhancement in radicle length and cotyledonary leaf dry weight was observed in genotype HG-258 and HG-2-20 respectively at higher level of salinity over control. An accumulation of metabolites such as proline and total soluble sugar (TSS) in the radicle and plumule of all the guar genotypes observed with increasing salinity levels. Accumulation of proline content in radicle and plumule was maximum in genotype HG-563 and HG-2-30 respectively at higher level (16 dSm-1) of salinity. Highest accumulation of TSS in radicle and plumule was found in genotype FS-277 and PNB respectively at higher level (16 dSm-1) of salinity over control. Sodium content of radicle as well as plumule of all the genotypes of guar increased with increasing salinity level; increase being found to highest in radicle of genotype HG-365 and plumule of genotype HG-75. Potassium content of radicle as well as plumule showed decreasing trend with increasing salinity levels. K+/Na+ ratio of radicle and plumule also decreased with increasing salinity level; decrease being highest in radicle of genotype HG-870 and plumule of genotype HFG-119. On the basis of the observations taken in the score-card i.e. germination and early seedling growth, it was found that genotype HG-884 was tolerant to salinity. SDS-PAGE of radicle and plumule of genotype HG-884 showed new band of 29.86, 72.46, 79.45 and 60.96, 79.45, 92.28 kDa respectively at all the levels of salinity.
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    ThesisItemOpen Access
    Morphophysiological responses of senna (Cassia angustifolia vahl.) to salinity
    (CCSHAU, 2010) Suman Bala; Varshney, U.K.
    Senna (Cassia angustifolia Vahl.) is a perennial, under shrub of varied medicinal value belonging to family caesalpiniaceae. It is commercially cultivated in Tamilnadu and its leaves and pods are medicinally important. In the present investigation germination, growth, reproductive yield and biochemical responses of Senna were studied under the influence of soil salinity viz. chloride dominated and sulphate dominated salinity. Two experiment were planned to achieve objectives of present study. In the first experiment seed were germianted in petridishes at varying EC levels viz. 0, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26 and 28 dSm-1 of Cl- dominated and SO42- dominated salinity. Results revealed that the progressive increase of EC levels not only inhibited the seed germination but also declined the speed of germination. Both salinity types proved deleterious to Senna seedlings as they decreased the seedling length, vigour index, fresh & dry weight and relative water content of seedling. Sulphate dominated salinity was found most detrimental to seedlings than chloride dominated salinity In the second experiment plants were raised by sowing seeds in dune sand filled polythene bags, in a screen house at varying EC levels viz. 0, 4,8,12 and 16 dSm-1 of Cl- dominated and SO42- dominated salinity along with nutrients. Results revealed a significant reduction in growth attributes such plant height, number of leaves per plant, leaf dry weight and stem and branches dry weight per plant at vegetative, maximum flowering and pod maturity stages with the build up of salinity in the growing medium. Relatively higher reductions were noticed under SO42- dominated salinity. Both root volume and root dry weight per plant significantly declined with the increase of salinity at the vegetative, maximum flowering stages. There was more declined under sulphate dominated salinity. A slight promotion in these growth attributes, however, was observed at the pod maturity stage upto 8 dSm-1 EC level of sulphate dominated salinity. Root/shoot ratio was found to increase with the of salinity at the vegetative and pod maturity stages. Increase of root /shoot ratio was more prominent under sulphate dominated salinity indicating that shoot growth was more adversely affected by sulphate dominated salinity as compared to chloride dominated salinity. Both the flower initiation and pod maturity were observed to be delayed by increase of salinity in the growing medium. The delay in flower initiation was relatively more under sulphate dominated salinity. Build up of salinity irrespective of salinity type, in the growing medium was found deleterious to reporudctive yield attributes such as number of pods per plant, pod dry weight per plant, number of seeds per pod, 100-seed weight and seed yield per plant. Significant changes in various biochemicals were also recorded. Accumulation of both total soluble carbohydrates and proline was recorded with the increase of salinity. Relatively higher accumulation of proline was observed under SO42- dominated salinity. The results demonstrated that inspite of better osmotic adjustment under sulphate dominated salinity treatments, the sulphate ions were more deleterious to the plants as compared to chloride ions. Chl “a”, chl “b” and total chlorophyll contents undergone more reduction under sulphate dominated salinity. Na+,Cl- and SO42- increased while K+ decreased with increasing EC levels.
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    ThesisItemOpen Access
    Effects of chloride and sulphate dominated salinities on growth and yield of lemongrass [Cymbopogon flexuosus (Nees ex Steud) Wats.]
    (CCSHAU, 2011) Sapna Kumari; Varshney, U.K.
    Lemongrass [Cymbopogon flexuosus (Nees ex Steud) Wats.] is a perennial grass belonging to family poaceae. It is commercially cultivated in Kerala, Assam, Maharashtra and Uttar Pradesh. The shoot of the plant bears an essential oil having typical lemon like odour. The oil is used in manufacture of vitamin A and several other preparations. The present research investigation was undertaken to enrich scientific database regarding the productive potential and economic yield of the medicinal and aromatic plant, lemongrass. The experiment was conducted to study the effects of chloride and sulphate dominated salinities on morpho-physiology, net primary productivity, herb yield and oil content of lemongrass. The plants were raised by rooted slips in dune sand filled polythene bags, in a screen house at varying EC levels viz. 0 (control), 4,8,12 and 16 dSm-1 of Cl- dominated and SO4 2- dominated salinity along with nutrients. The results revealed a significant reduction in growth attributes such as plant height, number of leaves per plant and number of tillers per plant at the two growth stages i.e. 60 DAT and 120 DAT, with the build up of salinity in the growing medium. Relatively higher reductions were noticed under Cldominated salinity. Senescent leaves (%) per plant, however, increased with the increasing EC levels. Senescence of leaves was found higher under chloride dominated salinity. SLA and LAR did not show any significant changes with the type and increasing EC levels of salinity. NAR and RGR, however, declined under the influence of salinity. Reduction in RGR was found higher under chloride dominated salinity. Root and shoot fresh weights as well as dry weights, also, declined with increasing salinity at both the stages. Cl- salinity proved more deleterious to both shoot and root growth and declined herb yield at 120 DAT. Accumulation of proline in leaves was found under the influence of salinity. Relatively higher proline accumulation was found under chloride dominated salinity. Chl ‘a’, chl ‘b’ and total chlorophyll contents undergone more reduction under chloride dominated salinity. Oil content (%) (fresh weight basis) was more in salt stressed plants than control. However, progressive increase of salinity declined it. Results revealed that after an increase under low salinity level (4 dSm-1) the oil yield per plant declined with the progressive increase of EC levels, at 60 DAT. The decline in oil yield per plant, however, was quite evident right from 4 dSm-1 EC level, at 120 DAT. Oil yield per plant was found higher under sulphate dominated salinity. Na+,Cl- and SO4 2- increased while K+ decreased with increasing EC levels. Accumulation of Na+ and SO4 2- was more under sulphate dominated salinity while that of K+ and Cl- was higher under chloride dominated salinity.