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Genetic Diversity in F5 Family of 129 T-amon Rice Genotypes

M.H. Rashid
ORC, Gazipur

M.E. Mahmud
Metal Agro Limited

M.A.K. Mian
Department of Genetics and Plant Breeding, BSMRAU, Gazipur

R. Islam
ORC, Gazipur

S.M.M. Hossain
RARS, Hathazari, Chittagong

Abstract/ Executive Summary:

The genetic diversity among F5 family of 129 T-Amon rice genotypes was studied using Mahalanobis D2 and Rao,s Canonical Variate Analysis. As per PCA, D2 and cluster analysis, the genotypes grouped into 10 clusters. PCA showed 69.65% variation against first four eigen values. The highest intra-cluster distance (0.921) was computed for cluster IX which composed of 24 genotypes. Lowest intra cluster distances were observed in cluster V (0.335) indicates that genotype belonging to this cluster are closest. CVA showed the highest (10.75) inter cluster difference between cluster I and VI and lowest (2.46) in between cluster VII and IX. The maximum values of intercluster distance indicated that the genotypes of cluster I was far diverged from those of cluster VI. Days to 100% flowering, days to maturity, plant height, tillers per hill, panicle length, primary branch per panicle and 1000 grain weight were found important for genetic divergence. The genotypes belonging to the cluster I and VI having greater cluster distance are recommended for inclusion in hybridization programme as they are expected to produce desired segregates.

Keywords: Rice, T-Amon, Genetic diversity, F5 family

Location: Experimental field of Genetics and Plant Breeding Department, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur

Start Date: 00-07-2006

End Date: 00-12-2006

Program Area: Variety and Species

Commodity: Rice

Objectives:

1. To increase the chance of obtaining maximum heterosis and gives broad spectrum of variability in segregating generations. Selection of parents based on genetic divergence has been successfully utilized in different crop species

Methodology:

The experiment was conducted at the experimental field of Genetics and Plant Breeding Department, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur-1706, during July to December 2006. 129 F5 materials evolved from crossing between CMS lines (IR62829A, IR58025A) and local rice germplasm. The cross IR62A×BR10 represents the genotypes from G1 toG10. The cross IR62A×BRRI Dhan 31 represents the genotypes from G11 to G32. The cross IR62A×BRRI Dhan 32 represents the genotypes from G33 to G35. The cross IR62A×lottang represents the genotypes from G36 to G51. The cross IR62A×Khirmapat represents the genotypes from G52 to G61. The cross IR62A×Kachabalam represents the genotypes from G62 to G65. The cross IR62A×Kachamota represents the genotypes from G66 to G69. The cross IR58025× Dudluchi represents the genotypes from G70 to G75. The cross IR58025×Gainja represents the genotypes from G76 to GG92. The cross IR58025×Basfulchikon represents the genotypes from G93 to G115. The cross IR58025×Aswina represents the genotypes from G116 to G126 and the cross IR58025×Gerumuri represents the genotypes from G127 to G129. The experiment was conducted using Randomized Complete Block Design (RCBD) with replications. Healthy seedling of 30 days old was transplanted in separate strip of the experimental field. In each strip 20×15cm spacing were maintained. Two lines of 5 meters long were constituted as experimental unit. Urea, TSP, MP and Gypsum were applied @ 150, 100 and 70 kg / ha respectively. Total TSP, MP and Gypsum were applied in final land preparation. Total Urea was applied in three installments, at 15 days after transplanting (DAT), 30 DAT, and 45 DAT recommended by BRRI (Anonymous, 2000). Data were collected from 10 randomly selected hills from the middle of the paired rows in order to avoid border effects. The following characters were studied on the basis of plant phenology such as days to 100% flowering, days to maturity, were recorded in time. After maturity the randomly selected 10 hills of each genotype of each plot were harvested to record yield and yield component character like plant height, tillers/hill, panicle/hill, effective tillers/hill, panicle length, primary branch/panicle, secondary branch/panicle, filled grains/panicle, unfilled grains/panicle, seed set %, 1000 grain weight and yield/hill. Genetic diversity was studied. Canonical analysis was also done to confirm the results of cluster and D2 analysis. Statistical analyses were carried using MSTATC programme.

Source of Information: BANGLADESH RESEARCH PUBLICATIONS JOURNAL; ISSN: 1998-2003, Volume: 2, Issue: 2, Page: 470-479, March - April, 2009

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The genotypes of cluster I could be selected for higher panicle length, filled grain/panicle, and higher grain yield per hill. The genotypes of cluster II could be selected for higher secondary branches per panicle. The genotypes of cluster III could be selected for higher primary branches per panicles and short type’s plant. The genotypes of cluster IV could be selected for early maturity and % seed set. The genotypes of cluster V could be selected for higher panicles per hill. The genotypes of cluster VI could be selected for long type plant and higher grain weight and late flowering if needed. The genotypes of cluster VII could be selected for early maturity and optimum panicle length. The genotypes of cluster VIII and IX could not generally select because any desired traits not found compared to other clusters mean. The genotypes of cluster X could be selected for highest tillers number per hill and dwarf plant type. Therefore, these genotypes belonging to different clusters with high or moderate genetic distance might be recommended for use in future hybridization programme.

Knowledge Management: Journal