Evaluation of Assam rice (Oryza sativa) genotypes for nitrogen use efficiency

SHANTANU DAS; PRAKASH BORAH; DEBOJIT SARMA; S S DAS; N S BARUA; SUBHASH BABU

doi:10.56093/ijas.v91i6.114302

Authors

SHANTANU DAS ICAR-National Bureau of Plant Genetic Resources, Pusa Campus, New Delhi
PRAKASH BORAH Assam Agricultural University, Jorhat, Assam 785 013, India
DEBOJIT SARMA Assam Agricultural University, Jorhat, Assam 785 013, India
S S DAS Birsa Agricultural University, Ranchi, Jharkhand
N S BARUA Assam Agricultural University, Jorhat, Assam 785 013, India
SUBHASH BABU ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi

https://doi.org/10.56093/ijas.v91i6.114302

Keywords:

Genetic divergence, Lowland rice ecosystem, Principal component analysis, Rice landraces, Varying nitrogen regimes

Abstract

We assessed genetic diversity in 26 rice genotypes including 21 landraces and five improved varieties grown in three different nitrogen doses, viz. 0, 40, and 60 kg/ha during kharif 2014-15, and identified superior nitrogen use efficient genotypes for lowland rice ecosystem. The presence of significant genotypic differences was registered for 12 quantitative traits of nitrogen use efficiency, grain yield, and its related traits. Mahalanobis distance-based clustering grouped the genotypes into seven clusters. The maximum contribution towards divergence was due to flag leaf area followed by physiological nitrogen use efficiency and grain yield/plant. Principal component analysis performed on the 12 quantitative traits revealed that the first four principal components accounted for 83.57% variance among the genotypes. Grain yield/plant (0.43), nitrogen utilization efficiency (0.39), and nitrogen harvest index (0.37) accounted most for principal component 1. The genotypes namely Lothabor, Betguti Sali, and Luhasali were found to be suitable for the lowland rice ecosystem.

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