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Articles by Md. Zakir Hossain
Total Records ( 2 ) for Md. Zakir Hossain
  Pankaj Kumar Bhowmik , Toshiyuki Matsui , Masayuki Fujita , Md. Zakir Hossain and Eizou Miki
  Two inhibitors of the first enzyme phenylalanine ammonia lyase (PAL) in the phenylpropanoid pathway were used to investigate the role of phenolic metabolism in lignification and toughness of Asparagus spears. Spears were soaked for 1 h at 20°C in aqueous solution of α-aminooxi-β-phenylpropionic acid (AOPP) at 0, 100, 300 and 600 μM. Liquid 2,5-Norbornadiene (NBD) was applied with a micropipette onto a sheet of filter paper in a 6.4 liter big jar which was immediately sealed with a cover. Liquid NBD readily volatilized at 25°C in a closed chamber. The amount of liquid applied was calculated to give the desired gaseous concentration (6000 μl L-1) in the jar. Both AOPP and NBD inhibited PAL activity and significantly decreased fiber content in both top and bottom portions of the spears. Northern blot analysis showed that expression in mRNA level coincided well with the changes in PAL activity and fiber content. These results confirm the view that AOPP and NBD, inhibitors of PAL enzyme activity, reduce PAL gene expression and decrease the fiber content of Asparagus spears, suggesting that downstream products of PAL enzyme activity may have a regulatory role in the lignification process.
  Md. Farid Uddin , Md. Abu Taher , Shah Md. Asraful Islam and Md. Zakir Hossain
  The experiment was conducted in the Tissue Culture Laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh, Bangladesh for micropropagation of tomato to evaluate the effect of variety and plant growth regulators in MS medium on shoot induction from virus infected calli of tomato plants. Three tomato varieties namely Bahar, Binatomato-2 and Binatomato-3 were used as plant materials in the present study. Callus derived shoots were induced on MS medium supplemented with different concentrations and combinations of plant growth regulators (PGRs). The combination of 0.2 mg L-1 IAA+4.0 mg L-1 BAP in MS medium was the best for inducing shoots which turned green to dark green after 15 days of culture. Callus derived shoots were fully virus infected which was confirmed by ELISA test. Meristem of plantlet can be used for the production of virus free tomato plant by meristem culture.
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