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Genetic Divergence in Doubled Haploid Lines of Spring Wheat (triticum Aestivum L.)

M. M. Rahman
Pulses Research Centre, Regional Agricultural Research Station, Isurdi, Pabna

A. K. M. Shamsuddin
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh 2202

U. Asad
Oilseed Research Centre, Regional Agricultural Research Station, Isurdi, Pabna

S. M. N. Islam
Department of Biotechnology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.

Abstract/ Executive Summary:

Genetic divergence of 17 doubled haploid lines and 3 check varieties of spring wheat were assessed through Mahalanobis’ D2-statistics. The genotypes were grouped into six clusters. The clusters I and III contained the highest number of lines (5). The cluster V contained single genotype. The maximum inter-cluster distance was noticed between the clusters I and V and minimum between III and VI. The highest intra-cluster distance was observed in the cluster IV and lowest in the cluster V.

Keywords: Wheat (Triticum aestivum L.), Genetic diversity, Doubled haploid

Location: Experimental field laboratory of the Department of Genetics and Plant breeding, Bangladesh Agricultural University, Mymensingh

Start Date: 00-00-2005

End Date: 00-00-2006

Program Area: Variety and Species

Commodity: Wheat

Objectives:

A number of doubled haploid lines in wheat were developed in the Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh through a USDA financed project “Production of haploid through wheat × maize cross and their utilization in wheat improvement”. These lines need assessment of variation among them for evaluation of their potentiality in breeding program. Multivariate approaches of analysis of variation among the lines were done with this view.

Methodology:

Twenty genotypes of wheat (Triticum aestivum L.) including 17 double haploid (DH) lines (DH-1, DH-2, DH-3, DH-4, DH-5, DH-6, DH-7, DH-8, DH-9, DH-10, DH-11,DH-12, DH-13, DH-14, DH-15, DH-16 and DH-17) and three varieties (Protiva, Kanchan and Shatabdi) were grown in randomized complete block design (RCBD) with three replications at the experimental field laboratory of the Department of Genetics and Plant breeding, Bangladesh Agricultural University, Mymensingh, during the winter of 2005- 2006. The plot size was 1.6 m 2.5 m. The distance between two plots was 50 cm. The spacing between rows and that of between plants in rows was 20 cm and 5 cm, respectively. Fertilizers and manures were applied at the rates of 200, 150, 80, 50 and 600 kg/ha of Urea, TSP, MOP, Gypsum and cowdung, respectively. Weeding was done when it became necessary. The crop was irrigated twice, one at the tillering stage and the other at grain filling stage. Data were collected from 10 random plants of the middle rows in each plot for days to maturity, plant height, spikes per plant, spike length, grains per spike, 100-grain weight and grain yield per plant. Data were subjected to analysis of Mahalanobis’ D2- statistics. Intra-cluster and inter-cluster distance, cluster mean and contribution of each character to the divergence were estimated as suggested by Singh and Chaudhary (1985).

Source of Information: Bangladesh J. Genet Pl. Breed: 20(2): 37-41, 2007

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The genotypes of the cluster I produced maximum number of grains per spike, whereas the genotypes of the cluster II produced minimum number of grains per spike. There was very little variation among the cluster means for 100-grain weight. The highest yield per plant was produced by the genotypes of the cluster III and that of lowest yield was produced by the genotypes of the cluster IV. Considering all the characters it appears that the genotypes in the cluster III had good performance. The genotypes in this cluster had intermediate growth duration, intermediate plant height, higher 100-grain weight and the highest grain yield per plant. The results of the present study indicate that the cluster I and V, I and IV, II and V exhibited wide distance between them. Parental material selected from these clusters would give broader spectrum of variation when they are hybridized. Therefore, for wheat improvement program parental materials should be selected from these clusters.

Knowledge Management: Journal