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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Nov 2021, 42 (6)                                     Back

nstantaneous and historical temperature effects on a-pinene

Genotypic and phenotypic dissection of Xanthomonas oryzae pv. oryzae on Indica rice cultivars for bacterial blight resistance


J. Kumar1,2, A. Hussain3, P. Singh1,4*, S.K.Y. Baksh1, M.K. Kar1, A.K. Mukherjee5, N.R. Singh2, B. Sinha3, Pramesh Kh.3, N. Singh K.3 and J.N. Reddy1

1Division of Crop Improvement, ICAR-National Rice Research Institute (ICAR-NRRI), Cuttack-753 006, India

2Department of Biotechnology, Ravenshaw University, Cuttack– 753 006, India

3Department of Genetics and Plant Breeding, Central Agricultural University, Imphal-791 103, India

4Department of Plant Breeding and Genetics, Veer Kunwar Singh College of Agriculture (Bihar Agricultural University), Buxar-802 136, India

5Division of Plant Protection, ICAR-National Rice Research Institute (ICAR-NRRI), Cuttack-753 006, India

*Corresponding Author Email :


Received: 29.04.2019                                                                             Revised: 12.09.2020                                                  Accepted: 15.03.2021




Aim: To evaluate the level of virulence of different Xoo isolates/ pathotypes of Eastern and North-eastern India and to identify the suitable donors in rice cultivars having various R-gene combination against virulent Xoo races of Bacterial Blight disease of rice.

Methodology: Thirty six Xoo isolates were collected from different places of Eastern and North-eastern India and genetic diversity/ similarity was examined by genotyping of pathotypes using JEL1/JEL2 markers. The 34 Indica rice cultivars carrying different R-gene combination were selected and grown in net house and inoculated artificially with Xoo inoculants from these races/ isolates bacterial of blight disease.

Results: The selected 36 Xoo isolates of Eastern and North-eastern India were grouped into seven different isolates/ races based on their genetic diversity using JEL1/JEL2 markers. Among 34 Indica rice cultivars, three or more R-gene combination (xa5 + xa13 + Xa21 and/or Xa4 + xa5 + xa13 + Xa21) cultivars exhibited highly resistant as compared to cultivars with single and double gene combination cultivars against most of the Xoo isolates/ races.

Interpretation: The cultivars may determine different level of resistance due to complementary effect of inheritance of suitable R-gene combination. Identified donors may be used for rice resistance breeding programme for Eastern and North-eastern India.       

Key words: Bacterial blight, Genetic diversity, Indica rice, Pathotyping, Resistant gene




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