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Research Detail

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L.F. Lipi
Hybrid Rice Division, Bangladesh Rice Research Institute (BRRI) Gazipur, Bangladesh

M.J. Hasan
Hybrid Rice Division, Bangladesh Rice Research Institute (BRRI) Gazipur, Bangladesh

A. Akter
Hybrid Rice Division, Bangladesh Rice Research Institute (BRRI) Gazipur, Bangladesh

M.R. Quddus
Hybrid Rice Division, Bangladesh Rice Research Institute (BRRI) Gazipur, Bangladesh

P. L. Biswas
Hybrid Rice Division, Bangladesh Rice Research Institute (BRRI) Gazipur, Bangladesh

A. Ansari
Hybrid Rice Division, Bangladesh Rice Research Institute (BRRI) Gazipur, Bangladesh

S. Akter
Plant Physiology Division, Bangladesh Rice Research Institute (BRRI) Gazipur, Bangladesh.

Eleven rice hybrids including two check varieties were evaluated to approximate their genetic variability, heritability, and genetic advance for ten quantitative traits. The analysis of variance illustrated that all the quantitative traits differed significantly indicating that enough variation is presenting the studied materials. Among the desirable quantitative traits number of filled spikelets per panicle was found to have the highest phenotypic and genotypic variance followed by a total number of spikelets per panicle. Almost all the characters showed a little variation between PCV and GCV revealing little influence of the environment on the expression of traits. High phenotypic and genotypic variance coupled with high heritability and the high genetic advance was observed for the number of filled spikelets per panicle, the total number of spikelets per panicle, plant height, and the number of unfilled spikelets per panicle. Such findings stipulated that these traits were governed by additive gene actions which are fixable and these traits may be accounted for a reliable index of selection. The genotypes G3 (IR79156A × EL108R) and G6 (IR79156A × EL253R) were selected as high response superior promising rice hybrids for achievable yield advantage 49% and 23%, respectively over best check varieties. Therefore, the G3 and G6 are proposed to be extensively evaluated for a further trial of variety release.

 

  Genetic advance, Rice Hybrid, Heritability, Variability
  Bangladesh Rice Research Institute (BRRI) Gazipur, Bangladesh
  00-00-2018
  00-00-2018
  Variety and Species
  Rice

To identify the promising genotypes for further advancement of breeding trial.

The present study comprised of nine F1 promising rice hybrids, combinations of BRRI35A × EL108R (G1), BRRI48A × EL108R (G2), IR79156A × EL108R (G3), BRRI35A × EL253R (G4), BRRI48A × EL253R (G5), IR79156A × EL253R (G6), BRRI35A × EL254R (G7), BRRI48A × EL254R (G8) and IR79156A × EL254R (G9) and two check varieties namely BRRI hybrid dhan4 (G10) and BRRI hybrid dhan6 (G11). The material was planted in Randomized Complete Block Design (RCBD) with three replications at research farm BRRI, Gazipur during T Aman (rain fed condition) 2018. The individual plot size of each entry was 10 m2. The seeds were fully soaked in water for 24 hours for the appearance of small shoots at the end of the seed. The pre-germinated seeds were sown in the seedbed. The seedlings were allowed to grow for 21 days in the seedbed before transplanting to the field on 18 July 2018. A single seedling per hill at 21 days was manually transplanted to the rice field. A standard spacing was maintained for planting which was row to row and plant-to-plant 20 cm and 15 cm, respectively. Fertilizers were applied at the rate of 150:100:70 kg N: P: K and 60:10 kg Gypsum: ZnSO4, respectively per hectare. Except for N, all fertilizers were applied as basal dose during final land preparation. Nitrogen fertilizer was applied as top-dressed at the splits of 15, 30, and 45 days after transplanting. Intercultural operation, disease management, and pest control measures were followed during the crop growth period. The data were recorded for ten quantitative traits viz., days to maturity, plant height (cm), effective tillers per hill, panicle length (cm), the total number of spikelet’s per panicle, number of filled spikelet’s per panicle, number of unfilled spikelet’s per panicle, spikelet fertility (%), 1000-grain weight (g) and grain yield (t ha-1) based on Standard Evaluation System for Rice (IRRI, 1996). Five plants were randomly selected from each plot excluding two border rows on both sides. Grain yield was adjusted at 14 % moisture content. Analysis of variance (ANOVA) was carried out using the R program package (Ri386 4.0.1). The genetic parameters consisted of phenotypic variances (Vp) and genotypic variances (Vg), phenotypic coefficient of variation (PCV) and genotypic coefficient of variation (GCV), heritability (%), genetic advance (GA), and genetic advance as percent of the mean (GAM) was estimated following the formula given by Burton and Vane (1953) and Johnson et al. (1955).

  SAARC J. Agri., 18(2): 39-49 (2020)
  DOI: https://doi.org/10.3329/sja.v18i2.51107
Funding Source:
1.   Budget:  
  

The estimation of genetic parameters in some promising rice hybrids implied that a number of filled spikelets per panicle had high phenotypic and genotypic variance with high heritability and high genetic advance. The total number of spikelets per panicle, number of unfilled spikelets per panicle, and plant height also showed high phenotypic and genotypic variance with high heritability and high genetic advance. This study also finds out the most promising rice hybrids G3 (IR79156A × EL108R) and G6 (IR79156A × EL253R) based on yield and all other yield-related traits and it could be released as a variety after conducting necessary yield trials.

  Journal
  


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