Low dose cadmium (II) induced antifungal activity against blast disease in rice

The present approach in this study aims to check infection of Pyricularia oryzae (MTCC-1477) in a rice cultivar (Khandagiri) by applying low dose (50 mu M) cadmium (II). In co-stress of Pyricularia oryzae and cadmium, the plants showed increased growth of shoot length and accumulation of protein, reducing sugar, photosynthetic pigments and antioxidative enzymes indicating improved growth and development at par with control plants. The co-stress induced increase in Phenylammonia lyase activity up to 752.01 U/mg protein and decrease in lipid peroxidation up to 15.81 mu g/g, this activity strengthen the idea of enhanced innate defense mechanism of the plant against the pathogen. Antioxidant enzymes demonstrated enhanced activity and number of isoforms in co-stress indicative index for better performance. Two protein bands of MW similar to 23 kDa and similar to 47 kDa were more pronounced in the fungal and Cd treatment respectively. But the most affected band of MW similar to 23 kDa disappeared due to co-stress, which may be designated as a Pathogen Related protein. The study under present experimental conditions is a trade off approach to next generation sustainable agriculture keeping in mind about rapid changing climate and alarming growth of environmental pollution.