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Articles by Mirza Hasanuzzaman
Total Records ( 4 ) for Mirza Hasanuzzaman
  Mirza Hasanuzzaman , Mohammad Anwar Hossain and Masayuki Fujita
  Abiotic stress is the major limiting factor of plant growth and crop yield. Better understanding of plant stress responses and tolerance is very important in the light of increasing intensities of stressors like salinity, drought, flooding, heavy metal, temperature extremes, high-light intensities, UB-radiation, herbicides, ozone and others, due to global climatic and other environmental changes. The role of Nitric oxide (NO) in stress responses in plants came in the focus of plant science in the last decade. NO is an important signaling molecule with diverse physiological and biochemical functions involving the induction of different intracellular plants processes, including the expression of defense-related and redox regulated genes against abiotic and biotic stress induced reactive oxygen species (ROS) detoxification. In spite of the significant progress that has been made in understanding NO biosynthesis and signaling in plant, several crucial questions remain unanswered. In this study, we reviewed the recent progress in NO research to reveal its diverse role in the physiological and biochemical processes in plants and the protective mechanisms towards abiotic stress tolerance.
  Mirza Hasanuzzaman , M. Anwar Hossain and Masayuki Fujita
  It is now well established that virtually all abiotic and biotic stresses induce or involve oxidative stress to some degree and the ability of plants to control oxidant levels is highly correlated with stress tolerance. Recently, the role of Selenium (Se) as an antioxidant has generated a wide interest in it. In trace amounts, Se is an essential micronutrient and has important benefits for animal and human nutrition although it has not been confirmed to be an essential micronutrient in higher plants. Selenium has been shown to exert a positive effect on crop growth and stress tolerance at low concentrations. However, the specific physiological mechanisms that underlie the positive effects of Se in plants have not been clearly elucidated. There is a wealth of evidence that low concentrations of Se enhance the growth of plants and improve antioxidative capacity of plants either by acting as antioxidant directly or by increasing the activities of antioxidant enzymes and bring out the tolerance under stressful condition. In contrast at high concentrations, Se acts as a pro-oxidant and leads to drastic reduction in yield. In this study we reviewed available literature regarding the possible regulatory role of Se in the various physiological processes of plants as well as its protective role under abiotic stress condition.
  Abul Hasnat Muhammad Solaiman , Takashi Nishizawa , Tuhin Suvra Roy , Mahfuzar Rahman , Rajesh Chakraborty , Jannath Choudhury , Md. Dulal Sarkar and Mirza Hasanuzzaman
  Stage of maturity often affects the yield, dry matter, specific gravity and color of potato tubers. Comparative account of some processing traits of three local varieties of potato (viz., ‘Fata Pakri’, ‘Sada Pakri’ and ‘Rumana)’ harvested at 80, 90, 100 and 110 days after planting with those of True Potato Seed variety ‘BARI TPS-I’ is given in this study tuber samples were harvested after 10 -days of tuber skin-curing in the soil. Yield increased significantly up to the last date of harvest. Mature tubers exhibited significantly higher dry matter and specific gravity compared to immature ones. Tuber color was also significantly affected by time of harvest irrespective of varieties. The ‘BARI TPS-I’ gave highest tuber yield. ‘Fata pakri’ exhibited highest specific gravity and dry matter content. On basis of flesh color, ‘BARI TPS-I’, ‘Fata pakri’ and ‘Sadapakri’ were found suitable for chips. Bangladeshi potato farmers and processors will get benefited from the information generated regarding the appropriate harvesting time of local potatoes for processing industries.
  Hasibur Rahman , Sayed Mohammad Mohsin , Md. Rafiqul Islam and Mirza Hasanuzzaman
  Background and Objectives: Infested seed can be the source of the pathogen for important diseases. Healthy or pathogen-free seeds are considered as the vital factor for the desired plant population and good harvest. The aim of the study was to examine the cucurbit seed associated fungi and efficacy of salicylic acid and some fungicides against these fungi. Materials and Methods: An investigation was carried out on the seed health status of 5 selected cucurbit seeds (Sweet gourd, Cucurbita maxima ; Bottle gourd, Lagenaria siceraria ; Cucumber, Cucumis sativus ; Ridge gourd, Luffa acutangula and Snake gourd, Trichosanthes cucumerina) collected from 5 different sources of Bangladesh. Five identified (Aspergillus flavus, A. niger, Rhizophus sp., Fusarium sp., Chaetomium sp.) and 2 unidentified fungi were isolated from cucurbit seeds and evaluate the efficacy of some selected chemicals (Dithane M-45 80 WP, Autostin 50 WDG, Tilt 250 EC and salicylic acid) against these isolated fungi. Results: The dry inspection revealed that the highest percentage of infected seeds found from snake gourd species and seeds collected from source 1. Blotter method stated that the maximum incidence found by Aspergillus flavus and Rhizopus sp. in all cucurbit species and seed sources. The seeds collected from source 1 and cucumber species showed the highest germination percentage. The efficacy of chemicals varied significantly in respect of isolated and identified fungi and the highest performance was shown by Tilt 250 EC. Conclusion: It was concluded that the seed health status of cucurbits seeds were not at a satisfactory level. Proper storage management with good chemicals can also give a satisfactory result.
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