Volume : 3, Issue : 3, SEP 2019

ECOPHYSIOLOGICAL STUDIES OF A CEREAL CROP (ORYZA SATIVA L.) WITH ALUMINIUM OXIDE STRESS

Dr. Rasmita Padhy, Krutika Panda, Pranati Panda, Jayashree Padhi, Manas Ranjan Padhy, Sandeep Kumar Padhy

Abstract

Rice is grown over an extremely wide range of climatic conditions. It is best suited to the regions that have high temperature, high humidity, prolonged sunshine and assured supply of water. Aluminium is not regarded as an essential nutrient, but low concentration can sometimes increase plant growth or induce other desirable effects. Aluminium is an important growth- limiting factor for plants in acid solution below pH 5.0 but can occur at pH levels as high as 5.5 in mine soils. The major aluminium toxicity symptom observed in plants is inhibition of root growth the root exhibit greater signs of cellular damage than other parts of the plant. Aluminum toxicity could be observed in root tips and in lateral roots. Aluminium oxide (Al2O3) was used as test chemical in this experiment.  The laboratory experiment is carried out the actual intensity of the chemical on various levels of seedlings for seven days. First stock solution was prepared by dissolving 1gm of test chemical in 1L of distilled water. Different concentrations of solution-Control (0.0), 25, 50, 75,100 mg/L of Al2O3 was prepared by proportional dilution with distilled water which is used for various treatment Sterilized cotton & blotting papers are spread on the petriplates where test chemicals were taken & surface sterilized 10 healthy seeds were taken for study of pigment. The maximum germination, emergence of leaf of seeds was observed in control. There was an inverse relationship between the germination of seeds and concentration of Al2O3. The root and shoot length was decreased with the increased level of aluminum oxide. The ratio of root and shoot length in control or untreated seeds is 1.87 cm and it  decreased with increase in concentration of test chemical and finally at 100mg/L concentration it was 1.52 cm.  There was increase in chl-a, chl-b,total chlrophyll content with increase in the concentration of Al2O3. Conclusively, our results show that Al2O3 at higher concentration decreases seed germination, leaf emergence, root and shoot length and an increase in chl-a, chl-b and total chlorophyll content. Our results suggest that the presence of Al2O3 at higher concentration resulted in growth inhibition, structural damage and decline in physiological and biochemical activities.

Keywords

Oryza sativa L.Pooja, Aluminium oxide (Al2O3), toxicity, Pigment analysis, Root length, Shoot length, Root/shoot ratio, Chlorophyll a,b and total chlorophyll.

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