NEEVA MAHAPATRA*, M. KAR AND B. K. HOTA
Adaptive Research Station of O. U. A. T., Sakhigopal, Satyabadi, Puri-752 014 (Odisha), India
*(e-mail : neevamahapatra@gmail.com)
(Received : August 28, 2017; Accepted : October 18, 2017)
ABSTRACT
Rainfed lowland rice ecosystem is affected not only by water deficit but also by excess water leading from partial to complete submergence. Breeding rice varieties with ample submergence tolerance is one of the approaches to alleviate the adverse effects of submergence which requires incorporation of physiological traits linked to tolerance mechanisms. Field experiment comprising 22 paddy 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. Underwater shoot elongation, survival percentage, shoot carbohydrate status and yield have been assessed in this study. The varieties Sabita and FR-43B had low per cent of underwater shoot elongation i. e. 16.41 and 19.98%, high shoot carbohydrate status i. e. 60.7 and 45.6 mg/g DW and higher survival percentage i. e. 70.22 and 68.95% and also yielded highest among others i. e. 38.43 and 38.07 q/ha, respectively. Therefore, these two varieties have been found to be the submergence tolerant varieties and the above mentioned characteristics could be possible physiological markers for screening of rice germplasm for submergence tolerance.
Key words : Carbohydrate, germplasm, paddy, shoot elongation, submergence, survival, tolerance