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Genetic Diversity Analysis in Exotic Hybrid Rice Genotypes Grown During Wet Season in Bangladesh

A. Ahmed
BRAC Agricultural Research and Development Centre, Gazipur.

S. G. Shaon
Agriculture and Food SecurityProgram, BRAC, Dhaka.

M. S. Islam
Agriculture and Food SecurityProgram, BRAC, Dhaka.

P. S. Saha
BRAC Agricultural Research and Development Centre, Gazipur.

M. A. Momin
Bangladesh Rice Research Institute (BRRI), Gazipur, Bangladesh.

Abstract/ Executive Summary:

Two experiments were conducted with 43 IRRI developed F₁ hybrid rice genotypes (HRDC) for ten agronomic characters in a randomized complete block design to study the genetic diversity through multivariate analysis in Gazipur and Pabna districts, respectively during wet season 2013. On the basis of D² values, the genotypes were grouped into five different clusters. During wet season, cluster III comprised maximum number of genotypes (15). The data obtained across locations showed that there are significant differences among HRDC genotypes for all growth parameters, yield and yield components. The highest yield (5.65 t ha^-1) was observed in HRDC 1341 because of produced heaviest panicle (4.28 g) and the lowest (2.48 t ha^-1) in HRDC 1311 because of obtained lowest fertility (49.9 %) and 1000-grain wt. (12.9 g), respectively. The maximum inter-cluster distances were observed between cluster I and V (11.63) and the minimum between cluster III and IV (2.35). The highest intra cluster distance (1.73) was observed in cluster III and minimum in cluster I (0.00), since it consisted with one genotype. Difference in cluster means existed for almost all the characters studied. Among the characters, growth duration, spikelet panicle^-1, fertility (%) and 1000-grain wt contributed the most for divergence in the genotypes. The highest mean values for fertility percentage, panicle weight and 1000 grain wt. but early flowering and short maturing genotypes were grouped into Cluster II followed by Cluster III and IV indicating that the genotypes have genetic potentiality to contribute better for yield maximization of hybrid rice.

Keywords: Genetic diversity, cluster, F1 hybrid rice genotypes, Multivariate analysis

Location: BRAC Agricultural Research and Development Centre, Gazipur and Dashuria Seed Farm, Pabna,

Start Date: 00-00-2013

End Date: 00-00-2013

Program Area: Variety and Species

Commodity: Rice

Objectives:

1. To estimate the nature and magnitude of genetic divergence and characters.

2. To the genetic divergence of these genotypes during wet season.

Methodology:

On farm trials were conducted with 43 F₁ hybrid rice lines from IRRI along with popular BRAC hybrid Aloran, Shakti-2 and BRRI dhan39 (inbred) in two locations Agricultural Research and Development Centre, Gazipur and Dashuria Seed Farm, Pabna, respectively in a Randomized Complete Block Design with three replications during wet season of 2013. Each plot measures 4.0 meter long and 2.0 meter wide in BRAC Agricultural Research and Development Centre and 3.8 meter long and 2.2 meter wide in Dashuria Seed Farm. Seedlings for each genotype were separated, labeled and these were bundled in convenient sizes. Seedlings of each genotype were transplanted in each designated plot. 23-26 days old seedlings of the genotypes were transplanted at one seedling per hill as a standard practice on a straight row at spacing of 20 cm x 20 cm. Gap filling was done a week after transplanting. Urea, TSP, MoP, Gypsum and ZnSO₄ fertilizer were applied at 180-80-70-60-10 kg ha^-1. The whole amount of TSP, Gypsum, two third of MoP and one third of urea were mixed and applied as basal application. ZnSO₄ was applied separately to avoid fixation with Phosphorus. The remaining urea was applied in two equal splits at maximum tillering stage and just before panicle initiation stage. The rest amount of MoP was applied before panicle initiation stage. Weeding was done two to three times and insecticides were applied as and when necessary to keep the fields free from insects-pests. All other recommended cultural management practices were followed to ensure good crop stand. Three hills (excluding border hills) from each plot were selected and tagged after transplanting for taking yield and yield components data at harvest. Morphological data were collected for ten quantitative characters at the appropriate growth stage of rice plants following the description for Oryza sativa L. The crop was harvested at maturity; the weight of grains was adjusted to 14% moisture content. Plant height (cm), panicles no. m^-2, days to 50% flowering; growth duration (days), panicle length (cm), spikelet panicle^-1, panicle weight (g), spikelet fertility (%), 1000 grain weight (g) and grain yield (t ha^-1) were measured.

Source of Information: The Agriculturists 13(2): 89-96 (2015), ISSN 2304-7321 (Online)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The overall results showed that Shakti-2 and Aloran was short maturing but the highest grain yield was observed in HRDC 1341 among the tested rice genotypes. Wider genetic diversity among the genotypes of the distant groups was observed. The genotypes under cluster IV gave the highest yield because of produced higher spikelet panicle^-1 than other clusters. The highest mean values for fertility percentage, panicle weight and 1000 grain wt. but early flowering and short maturing genotypes were grouped into Cluster II, III and IV. The genotypes under these clusters should therefore be selected, and their seed production feasibility in local condition should be studied before making final selection to submit in SCA trials as wet season hybrid in Bangladesh.

Knowledge Management: Journal