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Interrelationship and Cause-effect Analysis Among Morpho-physiological Traits in Biroin Rice of Bangladesh

Dr. Md. Jamil Hasan
Principal Scientific Officer
Head Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Abstract/ Executive Summary:

Statistically, significant variation was observed among tested materials for all the characters studied. The higher genotypic coefficient of variations was found in case of grains per panicle followed by grain yield/plant, 1000-grain weight and panicles per plant. High heritability was observed for all the tested characters except harvest index. High heritability with high genetic advance in percentage of mean was recorded for the characters grains per panicle, grain yield per plant and 1000-grain weight indicating role of additive gene action in the expression of these traits. Maximum contribution of more chlorophyll content to grain yield was observed in path analysis. Leaf area index, panicle length, days to maturity, grains per panicle, harvest index, 1000-grain weight and plant height had positive but indirect effect on grain yield through chlorophyll content. Similar trends were also observed in harvest index through leaf area index, panicles per plant, days to flowering, grains per panicle, chlorophyll content and panicle length. So for increasing grain yield per plant a Biroin rice cultivar should have more number of grains per panicle, large panicle length, high harvest index, high leaf area index value and more chlorophyll content.

Keywords: Genetic variability, Heritability, Genetic advance, Interrelationship, Cause-effect analysis

Location: BRRI HQ, Gazipur

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

To find out genetic variability, interrelationship and selection criteria for yield and yield components in traditional Biroin rice of Bangladesh.

Methodology:

The trial consisted of 10 local Biroin rice varieties collected from Sylhet and greater Mymensingh region of Bangladesh. The trail was set in a Randomized Complete Block Design (RCBD) with three replications. Thirty-five days old seedlings grown in wet seedbed were transplanted in 3.4x2.4 m² plots with a spacing of 20x25 cm, using single seedling per hill. Fertilizers were applied @ 60:40:40 kg NPK ha^-1. All other recommended nutrients were applied except nitrogen at final land preparation. Nitrogen was applied in three equal splits, at 15 Days After Transplanting (DAT), 45 DAT and just before panicle initiation. Intercultural operations and pest control measures were employed as when necessary during whole growing period. Leaf chlorophyll content and leaf area for calculating leaf area index were measured by using Japanese SPAD and leaf area meter, respectively. At maturity, grain yield was taken excluding border area and yield was adjusted at 14% moisture level. Data were recorded on ten characters, viz., plant height in cm (Ph), Days to Maturity (DM), Panicles per plant (PN), Harvest Index (HI), leaf area index in cm^-2 (LAI), Chlorophyll content (CHL) and Grain Yield in g (GY) from ten randomly selected plants from each plot. Again panicle characters viz., Panicle Length in cm (PL), Grains per panicle (GN), 1000-grain weight in g (GW) were recorded from 10 randomly selected panicles at maturity stage from each plot. The analysis of variance was done according to the MSTAT C software.

Source of Information: International Journal of Plant Breeding and Genetics 5 (3): 246-254, 2011

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From this study it is clearly observed that grains per panicle, panicle length, leaf area index, harvest index and chlorophyll content appeared most yield contributing characters for local Biroin rice. Further study with different Biroin rice varieties of Bangladesh may help confirmation of this study as well as genetic improvement for yield potentiality of local Biroin rice.

Knowledge Management: Journal