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Assessment of Character Contribution to the Divergence for Some Rice Varieties

M.R. Zaman
Bangladesh Rice Research Institute, Gazipur, Bangladesh.

D.N.R. Paul
Bangladesh Rice Research Institute, Gazipur, Bangladesh.

M.S. Kabir
Bangladesh Rice Research Institute, Gazipur, Bangladesh.

M.A.A. Mahbub
Bangladesh Rice Research Institute, Gazipur, Bangladesh.

M.A.A. Bhuiya
Patuakhali Science and Technonolgy University, Patuakhali, Bangladesh.

Abstract/ Executive Summary:

Fifteen modern rice varieties were grown in Aman seasons of 2002 and 2003. On the basis of data on days to 50% flowering, 1000-grain weight, plant height, flag leaf area, yield, field grain per panicle, tiller number per hill and flag leaf angle in the lower portion, characters like days to 50% flowering and 1000-grain weight made the largest contribution to the total divergence. After excluding less contributory characters to the total divergence and Mahalanabis D² values were calculated, then identified the most three distant and closest pairs. From the distance matrix tables of Mahalanabis D² analysis, (BR10, BRRI dhan30) was found as the closest pair and (BR5, BRRI dhan33) was found most distant pair. It was estimated that among the Aman varieties, yield, tiller number per hill, filled grains per panicle were the less contributing characters towards the total divergence. Breeding for the improvement of those characters, therefore, have the little possibility. However, there is a scope to improve days to flowering using those varieties.

Keywords: Divergence, Character contribution, Days to 50% flowering, 1000-grain weight, Aman rice varieties

Location: Bangladesh Rice Research Institute

Start Date: 00-00-2002

End Date: 00-00-2003

Program Area: Variety and Species

Commodity: Rice

Objectives:

To estimate the contribution of different characters to the total divergence and estimated the pair wise distance for each case to identify the right pair for using in hybridization program.

Methodology:

The experiment was conducted in the Aman seasons of 2002 and 2003 with 15 Modern Rice Varieties (MVs) following RCB design with three replications. All of these varieties were developed by the Bangladesh Rice Research Institute. The plot size was 18 m² with planting spacing of 20x20 cm. Standard crop management practices were followed to raise a good crop. From each plot 6 m² was identified during maximum tillering stage for grain yield and remaining 12 m2 area were used for taking other necessary data including destructive samples. Observation were recorded from 10 randomly selected plants of each plot on plant height (cm), number of panicles per hill, filled grains per panicle and 1000-grain weight (g), flag leaf angle (°) and flag leaf area (cm). Flag leaf area (cm) were calculated from middle most and longest tiller, at the time of flowering just after the complete emergence of the panicle satured crop was harvested and grain yield (t/ha) 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. Contribution of a character towards divergence was calculated in percentage with how many times that particular character ranked as l out of total number of combinations^[13]. To classify the BRRI developed Aman 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. For all the cases Mahalanabis D² values were calculated and identified distant and closer pairs.

Source of Information: Asian Journal of Plant Sciences, 4 (4): 388-391, 2005, (ISSN 1682-3974)

Article Link (Online Journal): http://scialert.net/fulltext/?doi=ajps.2005.388.391&org=11

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded that the character days to 50% flowering exhibited the largest contribution to total divergence followed by 1000-grain weight and plant height in BRRI developed aman varieties. Thus, there have a great scope to improve days to 50% flowering, 1000-grain weight and plant height using those varieties.

Knowledge Management: Journal