Search or add a thesis

Advanced Search (Beta)
Home > Characterizaiton, Cloning and Expression of Bt Gene Against Cotton Pests

Characterizaiton, Cloning and Expression of Bt Gene Against Cotton Pests

Thesis Info

Access Option

External Link

Author

Din, Salah Ud

Program

PhD

Institute

University of the Punjab

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Molecular Biology

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/10784/1/Salah%20ud%20Din_Molecular_Biology_2019_UoP_Punjab_PRR.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725671701

Similar


The efficacy of Bt toxins is diminishing because insects are becoming resistant to Bt δ-endotoxins. Second generation Bt vegetative insecticidal proteins (VIPs) could be a possible alternate of Bt crystal proteins. It has been demonstrated that Vip3Aa do not share any sequence similarity with any known Cry proteins and bind with different receptors sites in insect midgut. Plant lectins are carbohydrate-binding proteins that specifically recognize glycan structures in brush border membrane vesicle receptors present on gut epithelial cells of insects. In this study, codon optimized synthetic Bt Vip3Aa gene (2370 bp) driven by constitutive CaMV35S promoter and Allium sativum leaf agglutinin (ASAL) gene (339 bp) under phloem-specific RTBV promoter in a single 4870 bp (Vip3Aa+ASAL) cassette cloned in plant expression vector pCAMBIA 1301 under XhoI and HindIII were transformed in a local cotton variety (CEMB-33). For this purpose, the recombinant pCAMBIA_Vip3Aa+ASAL plasmid was electroporated in Agrobacterium tumefaciens strain LBA 4404 and subjected to inoculation with injured cotton embryos for introduction of desired genes through Agrobacterium to develop high resistance against major chewing and sucking insects. The putative transgenic cotton plants were confirmed through PCR by using gene-specific primers. The amplification of 587 bp fragment of ASAL gene and 682 bp fragment of Vip3Aa confirmed the successful introduction of desired genes in cotton. Total eighteen plants were found positive out of total fifty-three plants that were shifted in the field. The transformation efficiency was found to be 1.17%. The transgenic plants were also screened through Vip3Aa specific dipsticks and expression of GUS marker gene. The mRNA expression of both the genes was studied in five T1 transgenic cotton lines through quantitative real-time PCR (qRT-PCR). The comparative analysis of Ct values obtained by qRT-PCR analysis revealed that the mRNA expression of Vip3Aa gene varied from 2-8.7 folds in the lines L3P2 and L6P3 respectively. Similarly, the comparison of Ct values showed that the mRNA expression of ASAL gene ranged between 2-5 folds in transgenic lines L4P4 and L34P2. The transgenic line L6P3 showed significantly higher expression for both the genes. The expression of Vip3Aa protein in T0 and T1 generations was quantified through ELISA. The maximum protein concentration in both generations was seen in L6P3. The transgene location and copy number in the cotton genome were determined through Fluorescence in situ hybridization (FISH) in T2 generation. The transgenic cotton plant from transgenic line L3P2 showed homozygosity (two copy numbers) on chromosome number 9 at late telophase stage and one copy number at chromosome number 10 at prophase stage. Different morphological and physiological parameters of transgenic cotton lines in T1 progeny were studied in comparison to non-transgenic cotton plants. Statistically significant variation was observed in transgenic cotton lines for all the studied morphological characteristics, whereas, no significant differences were observed for physiological parameters. Similarly, the scanning electron microscopic (SEM) images of transgenic and non-transgenic cotton plants showed no visible difference in fiber morphology between transgenic and non-transgenic cotton plants which depicts no positive or negative correlation between expression of insecticidal genes and cotton fiber quality. The final objective of the current project was to evaluate transgenes efficacy against cotton bollworm (H. armigera) and whitefly (Bamisia tabaci). The results showed that all the transgenic cotton lines were significantly resistant to H. armigera as compared to non-transgenic control showing mortality rates between 78%-100%. Similarly, the transgenic cotton lines L3P2, L5P3, L6P3B and L6P3C showed 95%; 89%, 89%, and 72% mortality rates respectively in the whitefly bioassay. This study was unique in a sense that a combination of Bt and plant lectin genes was used to control major chewing and sucking insects to delay resistance buildup and stable insect control management.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

گمنام ہیرو

گمنام ہیرو

آئیں اپنے گمنام ہیروز کی قبریں تلاش کریں ۔اسی کی دہائی میں جب سندھ میں قوم پرستی کی تحریک نے زور پکڑا تو انہیں اپنے ایک گمنام ہیرو شہید جنرل ہوش محمد شیدی کی قبر تلاش کر نے کا خیال آ یا ہو شو شیدی کے نام سے مشہور اس ہیرو نے انگریزوں کے خلاف مزاحمت کرتے ہوئے سب سے پہلے(مر سوں مرسوں سندھ نہ ڈیسوں )کا نعرہ لگایا تھا ۔جب چیئر مین بلاول بھٹو زردار ی نے مر سوں مرسوں سندھ نہ ڈیسوں کا نعرہ لگا یا تو انہوں نے بھی شہید ہوش محمد شہید کے مزار پر حاضری دی اور سندھ حکومت کو مزار کی تعمیر کا حکم دیا ۔کمنٹس میں اس ہوش محمد شیدی کے مزار کی تصویر موجود ہے ۔پاکستان پیپلز پارٹی کی جاں گسل مزاحمتی تحریک میں کارکنوں نے بیش بہا قربا نیاں دیں۔ان میں سب سے پہلے ان ہیروز کانام آ تا ہے ۔جنہوں نے چیئر مین بھٹو شہید کی رہائی کی تحریک میں اپنی جا نوں کے نذرانے پیش کرتے ہوئے خود سوزیاں کیں اپنی جا نیں چیئر مین بھٹو شہید پر وار دیں ان میں ایک نام کشمیر سے تعلق رکھنے والے ملک عزیز شہید کا ہے جو پیشے کے اعتبار سے صحافی (پریس فوٹو گرافر )تھے ۔جنہوں نے راولپنڈی کے کمیٹی چوک پر چیئر مین بھٹو شہید کی رہائی کے لیے اکٹھے ہو نے والے ہزاروں کے مجمع میں اپنے آپ پر تیل چھڑک کر آگ لگا لی تھی اور قربان ہو گئے کیونکہ وہ اپنی زندگی میں اپنے محبوب چیئر مین بھٹو کو پھانسی چڑھتا ہو ا نہیں دیکھ سکتے تھے۔میں کچھ عرصہ پہلے خود سوزیاں کر نے والے پروانوں کے لیے پوسٹ کی تو ان کی نواسی سائرہ خورشید ایڈوکیٹ نے مجھ سے رابطہ کرتے ہو ئے بتا یاکہ ملک عزیز...

عالم برزخ اور عذاب قبر کا ثبوت ۲۶ قرآنى آىات مبارکہ کى روشنى مىں: اىک تجزىاتى مطالعہ

Holy Quran is the revealed book of Allah Almighty. This holy book has described the fundamental principles for the guidance and success of Human beings. One of the fundamental beliefs is that of life herein after (Akhirat). Allah Almighty has described several stages for the same life. The first destination of man purgatory which is like an interval between death and resurrection. This destination is the beginning point of the graciousness and severe pain in the life herein after. In the article under reference efforts have been made to explore and highlight the Quranic view point about purgatory (the interval between death and resurrection).

Data Mining Driven Learning Apprentice System for Medical Billing Compliance

Due to the importance of Brevibacterium linens in the industrial production of enzymes, amino acids and vitamins, the vast majority of research carried out has focused on expression of extra cellular proteins and amino acid biosynthesis. Most research to date on B. linens has demonstrated that the physiological and metabolic activities of the bacterium are significantly strain dependent. The heterogeneity among different stains of B. linens has also been confirmed by studies of DNA-DNA homology and partial 16S rDNA sequence analysis. A large number of questions remain to be answered in many areas of the physiology, metabolism, genetics, and taxonomy of Brevibacterium linens DSM 20158. As far as we are aware, there has not yet been a report on the global analysis of cellular proteins associated with B. linens DSM 20158. It may be because of the unsequenced genome of this strain. However in the present study due to the establishment of the Brevibacterium linens BL2 shotgun genome sequence, we have focused on three aspects of this bacterium in order to understand the physiology and biochemistry of the organism as a whole (i) by optimizing production, purification and characterization of industrially important extra cellular enzymes such as alpha-amylase, protease, lipase and an important amino acid L-Lysine which this strain produces naturally, (ii) by isolation, purification and characterization of respiratory chain complexes (iii) by charting the cellular and extra cellular proteome analysis of Brevibacterium linens DSM 20158 which lacks a sequenced genome by mass spectrometry-driven sequence similarity searches. One factor optimization is time consuming, laborious and does not give information about interactions between various fermentation variables. Therefore, we used a statistical approach to optimize factors that influence the production of extra cellular enzymes and amino acids. We used solid state fermentation due to its preference over submerged fermentation. Various cultivation parameters were optimized using a statistical approach to improve the alpha amylase, protease, lipase and L-lysine yield by Brevibacterium linens DSM 20158. The Plackett-Burman design was used to screen the fermentation variables followed by the optimization of significant parameters by response surface CCD in each case. Using the optimal factors, alpha amylase and protease yield was found to be twofold higher than that obtained in the unoptimized reference medium whereas lipase and L-lysine production was also found to be improved by using statistical IAbstract approach. The closeness of optimized values to experimental values proved the validity of the statistical model. B.linens was found to have a branched electron transport chain (Respiratory chain), in which electrons can enter the respiratory chain either at NADH (complex I) or at complex II level. In the present study, we were able to isolate and purify the complex-II (succinate dehydrogenase), complex III (menaquinole cytochrome c reductase cytochrome c subunit, complex IV (cytochrome c oxidase) and complex V (ATP synthase) of the plasma membrane of Brevibacterium linens strain DSM 20158. Oxidized, reduced and pyridine ferrohemochrome spectra of membrane-bound complex-II, III and IV of this bacterium showed the presence of cytochrome b, cytochrome c and cytochrome aa3 respectively which were further confirmed by the heme staining. The complex II isolated from Brevibacterium linens strain DSM 20158 seems to contain three subunits of 64.8-, 30- and 12- kDa. The enzymatic activity of succinate dehydrogenase showed that it is highly active in this microorganism. The complex III, also known as Menaquinol- cytochrome c reductase cytochrome c subunit, was identified with a single band of about 26 kDa. The complex IV (cytochrome c oxidase) was seen to be composed of two subunits at 62.8-, 32- kDa and was further confirmed by its enzymatic activity. The Complex V (F 1 F o -ATP synthase), essential for ATP generation by oxidative phosphorylation, is isolated, purified and appears to be biphasic in nature during its kinetic studies. Brevibacterium linens DSM 20158 is an industrially important actinobacterium, but the lack of a genome sequence limits the applicability of conventional protein identification methods to the proteome of this bacterium. Although a shotgun genome sequence for the BL2 strain of this microbe, it does not cover the entire scope of its proteome. This study has established the first comprehensive proteomic reference map of B. linens DSM 20158. The present study is carried out first by identification of proteins by homology database MASCOT followed by the advanced approach of de novo genome sequence assembly and MS BLAST to drive the expanding B. linens scope of proteomics. This study will help to enhance the usability of this strain of B. linens in different areas of research in future rather in food industries only.