Proceed<strong>in</strong>g of the 4 rd International Symposium“NEW RESEARCH IN BIOTECHNOLOGY” USAMV Bucharest, Romania, 2011Landjeva, S., Angelov, G., Nenova V., Merakchijska, M., Ganeva, G. (2004): Seedl<strong>in</strong>g growth andperoxidase responses to excess copper <strong>in</strong> wheat-Aegilops geniculata shromosome addition andsubstitution l<strong>in</strong>es. Genetics and Breed<strong>in</strong>gs. Vol. 33: 17-24.Mali, P., Mehta, Ch. (1977): Effect of drought on enzymes and free prol<strong>in</strong>e <strong>in</strong> rice varieties..Phytochemistry. Vol. 16: 1355-1357.Med<strong>in</strong>a, M., Qusada, M., Pilego, F., Botella, M., Valpuesta, V. (1999): Expression of tomatoperoxidasegene PRX 1 <strong>in</strong> NaCl-adapted and nonadapted suspension cells. Plant Cell Rep. 18: 680-683.Murashige, T., Skoog, F. (1962): A revised medium for rapid growth and bioassays with tobaccotissue culture, Physiol. Plant. Vol. 15: 473–497.Ne<strong>de</strong>v, T., Todorova, R., Kosturkova, G., Akita Devi, M.K., Sakthivelu, G., Giridhar, P.,Rajaserakan, T., Ravishankar, G.A. (2007): Variation <strong>in</strong> <strong>in</strong> vitro Morphogenic Response to GrowthRegulators <strong>in</strong> Soybean Genotypes from India and Bulgaria. International Electronic JournalBioautomation. Vol. 8 (S1): 193-200Przybilska, J., Blixt, S., Parzisz, H., Zimniak–Przybilska, Z. (1982): Isoenzyme variation <strong>in</strong> thegenus Pisum. I. Electrophoretic patterns of several enzyme systems. Genet Pol. Vol. 23: 103-121Sakthivelu, G., Akitha Devi, M. K., Giridhar, P., Rajasekaran, T., Ravishankar, G. A., Nikolova, M.T. , Angelov, G. B., Todorova, R. M., Kustorkova, G. (2008a): Isoflavone composition, phenol contentand antioxidant activity of Soybean seeds from India and Bulgaria, J. of Agrl. and Food Chem. Vol. 56:2090-2095.Sakthivelu, G., Akitha Devi, M. K., Giridhar, P., Rajasekaran, T., Ravishankar, G. A., Ne<strong>de</strong>v, T.,Kosturkova, G. (2008b). Drought <strong>in</strong>duced alterations <strong>in</strong> growth, osmotic potential and <strong>in</strong> vitroregeneration of soybean cultivars. Journal of General and Applied Plant Physiology. Vol. 34 (1-2): 103-112.Tamás, L., Ďurčeková, K., Halušková, L., Huttová, V., Mistrík, I., Ollé, M. (2007): Rhizospherelocalized cationic peroxidase from barley roots is strongly activated by cadmium and correlated withroot growth <strong>in</strong>hibition. Chemosphere. Vol. 66: 1292-1300.Todorova, R., Goranova, K. (2010): Rosa – A new Bulgarian soybean variety. In: Breed<strong>in</strong>g andTechnological Aspects <strong>in</strong> Production, Process<strong>in</strong>g and Use of Soybean and Other Gra<strong>in</strong> Legumes”,Proceed<strong>in</strong>gs of a Scientific-Practical Conference, Pavlikeni 2010, 37-40.Yun-Hee, Kim, Haeng-Soon, Lee & Sang-Soo, K. (2010): Differential responses of sweetpotatoperoxidases to heavy metals. Chemosphere. Vol. 81: 79-85.14
Proceed<strong>in</strong>g of the 4 rd International Symposium“NEW RESEARCH IN BIOTECHNOLOGY” USAMV Bucharest, Romania, 2011AN ANALYSIS OF THE EFFECT OF TEMPERATURE ON THEQUANTITY OF BT TOXIN IN COTTON VARIETIES1. Universitatea <strong>de</strong> Sti<strong>in</strong>te Agronomice si Medic<strong>in</strong>a Veter<strong>in</strong>ara, Bucuresti, Romania2. University of Agriculture, Faisalabad, PakistanMUHAMMAD SAJJAD ALIi 1 , INTEZAR ALI 2Abstract. The expression of Bt transgene <strong>in</strong> cotton cultivars is <strong>de</strong>pen<strong>de</strong>nt upon a host of factors.Extreme variations <strong>in</strong> temperature not only affect overall plant vigour and growth but the expressionof Cry1Ac gene is also compromised. The expression of Bt content correlated with temperature wasquantified <strong>in</strong> six cotton varieties dur<strong>in</strong>g the cotton year 2010-2011. The results <strong>in</strong>dicate a <strong>de</strong>cl<strong>in</strong>e <strong>in</strong>expression of Cry1Ac over temperature <strong>in</strong><strong>de</strong>pen<strong>de</strong>nt of the hybrid genotype. The situation necessitatesa post commercialization monitor<strong>in</strong>g of the formally approved cotton varieties.Keywords: Cry tox<strong>in</strong>; quantity; temperature; correlation1. INTRODUCTIONBt cotton was <strong>de</strong>veloped to thwart the bollworm’s attack and dur<strong>in</strong>g the last couple ofyears, there has been a steady growth <strong>in</strong> area covered by Bt cotton varieties <strong>in</strong> Punjab(figure 1).If on one hand, there is an <strong>in</strong>crease <strong>in</strong> the adoption of Bt technology, there arealso many Bt varieties of unknown parent germplasm.The expression of Bt tox<strong>in</strong> is <strong>de</strong>pen<strong>de</strong>nt upon a host of factors <strong>in</strong>clud<strong>in</strong>g parent germplasm,plant parts, availability of macronutrients especially nitrogen and changes <strong>in</strong> temperature.Accord<strong>in</strong>g to the work done <strong>in</strong> India, the expression of tox<strong>in</strong> <strong>in</strong> boll-r<strong>in</strong>d, squares and <strong>in</strong> theovary of flowers was found below the threshold of 1.8µg/g ,the amount consi<strong>de</strong>red as LD 99(Kranthi et al., 2005).A high dose expression of Bt tox<strong>in</strong> ensures the durability of Bt technology and it isimportant that the foliar plant parts express this endotox<strong>in</strong> <strong>in</strong> sufficient quantities to causemaximum mortality of the target pests i.e. Helicoverpa armigera (Hubner), Earias vitella(Fabricius) and Pect<strong>in</strong>ophora gossypiella.The first <strong>in</strong>star of these target pests completes<strong>de</strong>velopment on leaves chew<strong>in</strong>g the ten<strong>de</strong>r foliar tissues. An enhanced quantity of Btendotox<strong>in</strong>, therefore, <strong>in</strong> leaves is <strong>de</strong>sirable <strong>in</strong> domestically <strong>de</strong>veloped and commercializedBt cotton varieties.However, the temperature extremes affect the plant vigour lead<strong>in</strong>g to a <strong>de</strong>crease <strong>in</strong>production of Bt endotox<strong>in</strong>. The expression of Cry1Ac <strong>in</strong> Bollards due to temperaturevariations have been found vary<strong>in</strong>g and correlated with the survival of target pests (Olsen etal., 2005).The present study was <strong>de</strong>signed <strong>in</strong> or<strong>de</strong>r to verify the uniformity of optimumexpression of Bt tox<strong>in</strong> with temperature variations <strong>in</strong> commonly commercialized cottonvarieties dur<strong>in</strong>g the cotton season 2010-2011. It was necessary because earlier research hasshown a variance of Bt tox<strong>in</strong> <strong>in</strong> illegal varieties commonly found <strong>in</strong> farmers’ fields.15
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