Vol. 6, Issue 10 (2017)

Author(s):
Neeva Mahapatra

Abstract:
Submergence is an important constraint which prolongs partial submergence damages of rice plants and reduces grain yield. Due to the heterogeneity in flood-prone ecosystem, many different types of traditional rice varieties are being grown by the farmers. The local landraces adapted to extreme in water availability could be the sources of new gene(s) which would be utilized to improve the adaptability of rice to submergence with high yield. The main goal of this study is to identify new genetic resources tolerant to submergence based on morpho-physiological traits. Field experiment comprising 22 varieties which were completely submerged for 15 days under RBD design was conducted to screen out the submergence tolerant varieties basing upon morpho-physiological characters in the costal ecosystem of Odisha during kharif 2014 in the Adaptive Research Station, Sakhigopal. Nitrogen content of before submergence and during harvesting is the key criteria of yield. Nitrogen uptake during the harvesting is directly proportional to the yield. There are different yield attributing characters like 1000 grain weight, number of panicle per unit land and number of fertile grains/panicle which influence the final yield of the variety. The suitable combination among these varies depending upon the submergence tolerance of the variety. Based on the findings, it was concluded that the grain yield is positively correlated with number of grains/panicle and filled grains/panicle and negatively correlated with sterility percentage which is found incase of Sabita, FR-43B and Jalamagna.