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Management Strategies for Breaking Tuber Dormancy in Potato

Thesis Info

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Author

Haider, Wasim Muhammad

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Agricultural Technology

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/10895/1/Muhammad%20Wasim%20Haider%20_Horticulture_2018_UAF_PRR.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726609138

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This study was aimed at breaking potato tuber dormancy to facilitate their use as seed potatoes immediately after harvesting. Six genotypes out of 22 were selected in a screening trial based on their dormancy period to investigate the effect of plant growth regulators, i.e. benzyl amino purine or gibberellic acid or both, cold pre-treatment, electric current and irradiation on breaking tuber dormancy and subsequent field evaluation. The sprouted genotypes were categorized into short, medium and long dormant groups. Their weight, sprouting behaviour, antioxidative enzymes, hydrogen peroxide contents, hormonal contents and sugar contents were analysed at one week and three week intervals after subjecting tubers to dormancy breaking methods. This investigation was carried out using completely randomized design (CRD) under factorial settings. Among PGRs, 60 mgL-1 BAP and its combination with 20 mgL-1 GA3 most effectively reduced the dormancy duration. Gibberellic acid produced maximum sprout length with concentration 20 mgL-1 but was statistically comparable to effect of combined application of 60 mgL-1 BAP and 20 mgL-1 GA3. The interaction of PGR × genotype was more pronounced in short-term and medium-term dormancy genotypes and less pronounced in long-term dormancy genotypes. The cold pre-treatment had the greatest effect at 2°C for breaking tuber dormancy and inducing sprout length. However, use of electric current was most effective at 80 volt to shorten tuber dormancy and develop longest sprout. Irradiation proved to be most effective at highest dose, 3.5 kGy. Hydrogen peroxide contents and superoxide dismutase and ascorbate peroxidase activities after treatment with PGRs, low temperature, electric current and irradiation increased from first week to the third week of storage. In contrast, catalase and peroxidase activities were decreased. In hormonal contents, zeatin increased and GA1 and ABA decreased during the storage period of three weeks. The increase in sugar contents with passage of storage time was observed in selected genotypes. Overall, two-way interaction, genotype × storage period was significant for the observed attributes i.e. antioxidative activities and hormonal and sugar contents. The field experiment was conducted with factorial arrangement based on randomized complete block design using three replications. Various physical (days to emergence, emergence percentage, leaf area and number of stems and tubers per plant), physiological (Photosynthetic rate, transpiration rate and stomatal conductance) and biochemical attributes (chlorophyll contents in leaves, specific gravity and tuber dry matter) were studied during the crop growth period. The individual 2 effects of dormancy breaking methods and genotypes were significant (p<0.05) for days to emergence, emergence percentage, number of stems and tubers per plant and leaf area. The combined effect of dormancy breaking methods and genotypes was however nonsignificant. The main and interactive effect of dormancy breaking methods and genotypes significantly affected the plant photosynthetic rate, transpiration rate and stomatal conductance; also the biochemical constituents i.e. leaf chlorophyll contents, tuber specific gravity and tuber dry matter contents. The last experiment involved assessment of relationship between true seed and tuber dormancy in a Solanum tuberosum group phureja - stenotomum hybrid population. The 12 random crosses were selected for this study. For the study of tuber dormancy, parental genotypes were harvested from three different locations Presque Isle, Maine; Plymouth, North Carolina and BARC, Maryland; and kept in cold store of BARC, Maryland, USA at 7 °C. Parental tuber dormancy ranged from 6-10+ weeks. TPS seedling vigor ranged from 9 to 94.2%.The seedling vigor index of all the progenies obtained from the long dormant parent was lower except WHD-7 had the higher value of seedling vigor index with both parents were long-dormant. No correlation (r = 0.01) was found between parental tuber dormancy and seedling vigor index. So, for the selection for early sprouting, offspring in-vitro needs to correlate with short tuber dormancy in subsequent field generations. Overall, from this study we can draw several conclusions. i) The dormancy duration and sprout length varies among genotypes. ii) The use of PGRs has been the most efficient dormancy breaking method, followed by electric current, cold storage and irradiation in order to their effectiveness for breaking dormancy and subsequent field performance. iii) The biochemical attributes i.e. antioxidative enzymes and hormonal and sugar contents changed significantly in different genotypes with the progression of storage period. iv) The parental genotypes harvested from different locations differed significantly in term of dormancy duration and sprouting percentage and there was no correlation (r = 0.01) between parental tuber dormancy and offspring true potato seed.
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In India scholar‘s had played incredible role for ‘Hadith’. The service of Indian Muslim scholars about methodology of Hadith is much more than other countries scholars in the last 50 years of thirteenth century. Their name should be written in golden words. There services about the methodology of Hadith are great one. Muslim scholars of sub-continent had taken keen interest in the research work of Hadith and its explanation. If we evaluate the theological history of India that ; Shah Waiullah ‘and his family worked day and night for expansion and publishing of’ Hadith  ‘ Thirteenth century of hire is called a century of revolution as concerned for Hadith. Because in that era proper theological institutions were set up and very strong institutions had spread knowledge and study of methodology of Hadith

Molecular Epidemiology of Malarial Parasite from Punjab, Pakistan and its Control Through Plants Based Extracts and Nanoparticles

Malaria is one of the serious diseases distributed worldwide, especially in the underdeveloped countries of tropical and subtropical regions. It is caused by protozoan parasites of genus Plasmodium, which is transmitted in humans a mosquito vector of the genus Anopheles. In human, the five species of Plasmodium are yet diagnosed causing malaria i.e. P. vivax, P. ovale, P. malariae, P. falciparum and P. knowlesi of which P. falciparum and P. vivax are widely distributed. The available epidemiological data on malaria from Pakistan is insufficient. Moreover the malarial patients are showing resistance against the prime antimalarial drugs like chloroquine, pyrimethamine, mefloquine and artemisinin. Therefore the present work is planned to identify different species of Plasmodium, their incidence in the ten selected cities of Punjab, Pakistan situated in the Northern and Southern Punjab. The seed extract of five medicinal plants and nanoparticles of silver and iron of three effective plants that showed antiplasmodial activity were evaluated in an in vivo experiment using BALB/c mice infected with Plasmodium berghei strain. The data of (n=16075) malaria suspected cases and blood samples of microscopically positive samples (n=925) were collected from different hospitals of ten cities of Punjab. i.e. Rawalpindi, Jhelum, Gujrat, Chakwal, Gujranwala, Dera Ghazi Khan, Rajanpur, Rahim Yar Khan, Multan, and Bahawalpur in whole year of 2015 from January to December under all biosafety and bioethical rules. The blood samples were evaluated for distribution of malaria cases among the study area, seasonal variation, age group, gender, and for species diagnosis on the basis of microscopy and molecular analysis. After that prevalence was estimated on the basis of molecular results. Some of the positive PCR products were analyzed by DNA sequence and evolutionary history was inferred using the Neighbor-Joining method. The aqueous seed extracts of five medicinal plants, i.e. Trachyspermum ammi, Punica granatum, Cydonia oblonga, Benincasa hispida and Saussurea lappa were obtained via soxhelet apparatus and identified for major constituents by phytochemical analysis. The experiment was designed using BALB/c mice as a model animal infected with Plasmodium berghei pathogen to find antiplasmodial activity of selected plants. The three plants T. ammi, P. granatum and S. lappa were used to synthesize silver and iron nanoparticles. The presence of nanoparticles was confirmed by UV-visible spectroscopy; Fourier transformed infrared spectroscopy, X-ray diffraction analysis and Transmission electron microscopy. In order to calculate LD50 the mice were given four different oral doses of each plant extract, observed for their physical behavior and other toxicity symptoms like convulsion, coma and death. The LD50 was calculated by Probit analysis. The mice were grouped and infected with Plasmodium berghei. After seventy two hours of post infection mice were treated with different concentrations of experimental plants and their silver and iron nanoparticles. The effect of seed extracts and nanoparticles were studied by general symptoms, parasite count, chemosupression, survival time measurement, histopathology, biochemical and hematological analysis along with the positive and negative control on randomly selected five mice from each group. The slide positivity rate, annual parasite incidence and annual blood examination rate were 5.75%, 0.12 per 1000 population and 0.22% respectively in all recruited cities Punjab. The seasonal variation showed that highest cases were recruited in summer season, i.e. from June to September then its incidence decreases. The age wise distribution of malarial patients was maximum among 1-20 years and lowest among 41- 60 years. The gender wise distribution indicated that Plasmodium infection was dominant in males than females in all study areas. Out of the 925 microscopically positive recruited malarial infection 66.70% (n=617) were diagnosed as P. vivax, 23.67% (n=219) as P. falciparum and 9.62% (n=89) as mixed containing both P. vivax and P. falciparum whereas no case of other Plasmodium species was observed. The PCR results showed that 53.40% (n=494) as P. vivax, 16.70% (n=173) as P. falciparum and 12.86% (n=119) as mixed species and 15.02% (n=139) were not amplified through PCR. The overall prevalence of treatment seeking malarial patients in all recruited cities of Punjab was 4.88%. The DNA sequenced sample of P. vivax and P. falciparum found in this study were more related to India, Brazilian western Amazon and Korea species of phylogenetic trees. The qualitative phytochemical analysis of experimented plants revealed the presence of alkaloids, flavonoids, saponins and steroids, etc. The maximum antiplasmodial activity (80.06±4.89) was observed for the S. lappa that was treated at the dose of 750 mg/kg. The P. granatum, B. hispida, T. ammi, and C. obloga showed antiplasmodial activity as (77.58±2.09) > (71±6.12) > (69.76±2.01) > (68.76±2.01) at the dose of 500 mg/kg. The maximum antiplasmodial activity was observed for the Silver nanoparticles of P. granatum (85.92 ±0.5) > S. lappa (85.32 ±0.82) > T. ammi (83.50 ±0.65) that was treated at the dose of 150 mg/kg. The iron nano particles results showed that antiplasmodial activity was observed in an order of S. lappa (82.51±4.68), >P. granatum (81.46±3.10) > T. ammi (77.14±4.18) at the dose of 300 mg/kg. However the nonsignificant (P>0.5) results was shown when the chemosupression was compared with chloroquine treated group. The mean survival time, weight change, biochemical, the hematological and histopathological analysis also showed a marked difference in infected untreated group as compared to groups treated with nanoparticles, plant extracts and chloroquine. The slide positivity rate, annual parasite incidence, and blood examination rate was high in Northern Punjab as compared to Southern Punjab. Season wise distribution of malaria indicated the high incidence in summer and postmoon season. The incidence of malaria was high in low and middle age group as compared to the old age groups. The gender wise distribution indicated that Plasmodium infection was dominant in males. The present studies confirmed the presence of two Plasmodium species i.e. P. vivax and P. falciparum from the clinical isolates of the ten cities of Punjab, Pakistan. The overall prevalence of treatment seeking malarial patients in all recruited cities of Punjab was 4.88%. The seeds of S. lappa, P. granatum and B. hispida exhibited significantly more antiplasmodial activity as compared to T. ammi and C. oblonga. Both silver and iron nanoparticles of all the three experimented plants exhibited antiplasmodial activity and also no adverse effects on the hematology, histology and biochemical parameters were observed. It is therefore suggested that the emerging nanotechnology can be used in drug formulations. The synthesized nanoparticles can be used to develop new agents for parasite control. In this study non-specific targeting of nanoparticles were studied, but special targeted nanoparticles can be designed that can help the immune system to attack the species of malaria parasite after it enters the body and before it has a chance to hide and aggressively spread. In this way nanoparticles can also help in the vaccine formation by stimulating the immune system.