Physiological and morphological effect of ethyl methanesulfonate on two rice varieties (Oryza sativa L.) of Assam
Ratan Chowdhury, Ambarish Bhuyan
Rice is produced in a wide range of location and under a variety of climatic conditions. Many local varieties are available. Genetic variation is required for crop improvement of the useful traits. Mutagenic agents can induced mutations and generate genetic variation. The present investigation aims at finding out the mutagenic effects of the mutagen, Ethyl methanesulfonate in different traits selected such as in germination, seedling height and number of rootlets, root length and number of tillers in the seeds of two indigenous rice varieties of Assam, Ahu and Baismuthi. The experiments were conducted for both laboratory as well as field conditions. The results shows that the highest % germination as observed on the control samples as expected when compared to that of treatment. With increasing EMS amounts there has been a decrease in seedling height. Under field conditions, the plant height (in Ahu) observed during the late stages of seedlings and early stages of adult plants shows that it increase steadily with increase in concentration of EMS in comparison to that of the control whereas the number of root length and roots (in Baismuthi) shows a decrease in increasing EMS concentration in comparison to the control. The number of tillers were also found to decrease with increasing concentration in both the varieties.