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Multivariate Statistical Technique in Analysing Varietal Characteristics

Debi Narayan Rudra Pual
CSO
Head, Agril. Statistics Division(BRRI) Gazipur-1701

Manotosh Howlader
SSO
gril. Statistics Division(BRRI) Gazipur-1701

Abstract/ Executive Summary:

The objective of the study is to determine the character contribution towards divergence in BRRI- released Aman rice varieties. The experiment was conducted in Aman season of 2003 with 15 modern varieties (MVs) of rice namely BR3, BR5, BR10, BR11, BR22, BR23, BR25, BRRI Dhan30, BRRI Dhan31, BRRI Dhan32, BRRI Dhan33, BRRI Dhan34, BRRI Dhan37, BRRI Dhan38 and BRRI Dhan39 following RCB design with three replications. Mahalanabis D² method was applied. 1000 Grain weight is the least variable plant character followed by days to 50% flowering, while the most variable characters are percent filled grain followed by flag leaf angle. Days to 50% flowering is the largest contributor (70%) to the variety divergence followed by 1000 grain weight (23%).

Keywords: Grain weight, Variety divergence, Flowering

Location: BRRI HQ,Gazipur

Start Date: 00-00-2003

End Date: 00-00-2003

Program Area: Socio-economic and Policy

Commodity: Rice

Objectives:

To determine the character contribution towards divergence in BRRI- released Aman rice varieties
To identify the factors causing similarity and diversity among the genotypes

Methodology:

The experiment was conducted in Aman season of 2003 with 15 modern varieties (MVs) of rice namely BR3, BR5, BR10, BR11, BR22, BR23, BR25, BRRI Dhan30, BRRI Dhan31, BRRI Dhan32, BRRI Dhan33, BRRI Dhan34, BRRI Dhan37, BRRI Dhan38 and BRRI Dhan39 following RCB design with three replications. The plot size was 18 m² with plant spacing of 20 x 20 cm. Standard crop management practices were done to maintain normal crop growth. From each plot 6 m² was identified during maximum tillering stage for grain yield and rest 12 m² area were used for taking other necessary data including destructive sample. Ten plants were randomly selected for measuring the plant characters: plant height, number of panicles per hill, filled grains per panicle, 1000-grain weight. Flag leaf angle and flag leaf area were calculated from middle most and longest tiller flowering just after the complete emergence of the panicle sutured crop was harvested and grain yield was calculated at 14% moisture content Mahalanabis D² determines the distance between any two varieties based on common characters measured on each variety. Contribution of each character towards divergence was calculated taking under consideration of all combinations. Each character was ranked on the basis of the different value for each combination and thus rank-1 was given for the highest value for each combination. To classify the BRRI varieties, at first eight characters were considered and their contributions towards divergence were assessed. The characters showing the null or almost null contribution were excluded one by one and reassessed the contribution. In such way character contribution assessment were done with 8, 7 and 6 characters separately. In all cases, Mahalanabis D² was calculated and distant and closer pairs were identified. When contribution was assessed using all 8 characters, % filled grain/panicle and flag leaf angle showed null contribution to divergence. When flag leaf angle was excluded and the contribution was assessed using 7 characters, percent filled grain showed null contribution. When tiller number per hill was excluded from the analysis, percent filled grain showed null contribution and the contribution of tiller number per hill was only 7%. Further tiller number per hill and Flag leaf angle were excluded and the contribution was assessed using 6 characters

Source of Information: BRRI Annual Report 2003-04

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

1000-grain weight is the least variable plant character followed by days to 50% flowering while the most variable characters are precent filled grain followed by flag leaf angle. Days to 50% flowering is the largest contributor (70%) to the variety divergence followed by 1000-grain weight (23%)

Knowledge Management: Report/Proceedings