Journal of Environmental Biology

Characterization of rice (Oryza sativa L.) genotypes on the basis of morpho-physiological and biochemical traits grown under aerobic situation in rainfed ecosystem

Santosh Kumar¹*, Sharad Kumar Dwivedi¹, S.S. Singh¹, Sanjeev Kumar¹, P.K. Sundaram¹, Shivani¹ and A.K. Mall²

¹ICAR research complex for eastern region, Patna-800 014, India

²Indian Grassland and Fodder Research Institute (IGFRI), Jhansi-284 003, India

*Corresponding Author?s E-mail: santosh9239@gmail.com

 Publication Data

Paper received:

09 December 2013

Revised received:

07 June 2014

Re-revised received:

27 August 2014

Accepted:

8 November 2014

Abstract

The objective of the present study was to examine the effect of aerobic situation on yield, physiological and biochemical traits of advanced breeding lines of rice. Experiment was conducted with two set of rice genotypes under two water regimes (aerobic and irrigated), during three consecutive wet seasons 2010-2012. Significant decrease in yield was observed in rice genotypes grown under aerobic situation as compared to the irrigated ones. Promising rice genotypes having the ability to maintain high plant biomass, harvest index, early vegetative vigour, improved physiological and biochemical traits in terms of relative water content (RWC), leaf area index (LAI), total soluble sugar, starch, protien and proline content help to sustain higher grain yield under aerobic situation. The yield gap between aerobic and irrigated rice ranged between 24% to 68 %. Grain yield showed positive correlation with harvest index (0.434), test weight (0.647), plant biomass (0.411) and effective tiller numbers (0.473), whereas spikelet sterility was negative associated (-0.380). The current study suggested that promising genotypes viz., IR77298-14-1-2-130-2, IR84899-B-182-3-1-1-2, IR84887-B-157-38-1-1-3 and IR 84899-B-179-1-1-1-2 for aerobic situation, showing yield advantage due to better performance of physiological and biochemical traits, might be adopted in large area of rainfed ecosystem as well as in irrigated areas where water scarcity was a major problem. ?    

 Key words

Aerobic rice, Biochemical traits, Grain yield, Physiological traits, Water deficit 

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