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Cover Page (Vol 9, Issue 3)

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ABIOTIC STRESSES CAUSED BY COLD ACCLIMATION ON THE DEVELOPMENT OF ROOT GROWTH OF UREA INDUCED PADDY (ORYZA SATIVA)
Md. Shahidul Haque, Md. Kamal Hossain and Md. Ashraful Haque
Biochemistry
Abstract

Cold acclimation is involved in metabolic regulation in plants and other species of organisms.  To examine its role on urea induced root growth of paddy, a pot experiment was conducted to assay protein and inorganic phosphate (Pi) in root extract.  Paddy exposed to cold for 24h had mild effect on protein content and however, reduced amounts (10.9% and 20.1%) were found after 48h and 72h treatment respectively.  In urea induced paddy for the above mentioned time, the similar 35.7% and 37.8% reduced root proteins were found although prolonged exposure shows the higher effects.  On the other hand, whenever, paddy was exposed to cold, the amount of Pi in root was also reduced (50.1%, 18.8% and 27.3%) after 24h, 48h and 72h period respectively. Moreover, cold acclimation shows the similar reduced Pi level (56.9%, 26.1% and 34.2%) in urea induced paddy.  The results indicate that cold acclimation is strictly involved in the regulation of both protein and Pi level and the reducing effects in these parameters even in the presence of urea in soil in this species of paddy would be an environmental adverse stimulus for the development of urea induced root growth.