Received:February 12, 2020;   Published: February 20, 2020

DOI: 10.32474/CIACR.2020.08.000284

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Abstract

A research work was conducted for generating blast resistant fine aromatic rice through crossing technique using landraces viz., BRRI dhan 34 as susceptible, Kataribhog and Radhunipagol as resistant sources during June to December, 2017 at experimental farm of Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh. The assessing data were based on different disease parameters at different days after transplanting (DAT) and yield. In field study, BRRI dhan 34 exhibited the highest number of spots (68.40), percent leaf blast severity (11.73), number of death leaf (6.33), neck blast (2.20), node blast (6.20), collar blast (4.33), death panicle (2.07) and yield per plant (68.64). The genotypic variance, phenotypic variance, genotypic coefficient of variation (GCV), phenotypic coefficient of variation (PCV), heritability, genetic advance and percent genetic advance were estimated where the PCV values were higher than corresponding GCV values for all of the selected characters. In comparison, the highest heritability value (99.49%) was estimated for collar blast per plant. Number of spots, percent leaf blast severity and neck blast asserted significant and positive correlation with, node blast, collar blast, number of death panicle, spikelet per panicle and yield. Among the disease parameters node blast per plant showed positive direct effect (0.227) on yield. Number of spots revealed highest indirect effect on yield via node blast (0.164). Number of spot (-0.014), death leaf (-0.162) and death panicle (-0.015) exhibited with negative direct effect on yield. In crossing, F1 generations (7) were developed from the cross BRRI dhan 34 × Kataribhog and BRRI dhan 34 × Radhunipagol. It is suggesting that for developing disease resistant fine aromatic rice, the number of spots and percent leaf blast severity responded highly genetical transmissible character resulting highly positive significant correlation in yield contributing linkage.

Keywords: Blast; BRRI dhan 34; resistance gene; cross

Abstract| Introduction| Materials and Methods| Statistical Analysis| Results| Discussion| Conclusion| References|