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Variability Assessment of Different Maintainer Lines for Hybrid Rice Development Based on Qualitative Traits

L F Lipi*
Hybrid Rice Division, BRRI, Gazipur, Bangladesh.

M J Hassan
Hybrid Rice Division, BRRI, Gazipur, Bangladesh.

A Akter
Hybrid Rice Division, BRRI, Gazipur, Bangladesh.

P L Biswas
Hybrid Rice Division, BRRI, Gazipur, Bangladesh.

M U Kulsum
Hybrid Rice Division, BRRI, Gazipur, Bangladesh.

A Ansari
Hybrid Rice Division, BRRI, Gazipur, Bangladesh.

M Z Islam
Genetic Resources and Seed Division, BRRI, Gazipur, Bangladesh.

Abstract/ Executive Summary:

The assessment of genetic diversity among nineteen maintainer lines was studied based on thirteen qualitative traits. The single linkage clustering, morphological dendrogram were performed to assess the traits. Most of the traits showed variation in different maintainer lines except auricle colour. On the basis of flag leaf attitude, a maximum of four groups were formed with erect, semi-erect, horizontal and descending type leaf angle. The maintainer line BRRI20B has an awn tip, which is unique from the rest of the studied maintainer lines. Nineteen maintainer lines were grouped into four different clusters and a considerable level of variability was displayed for most of the traits examined. The clustering pattern revealed cluster I was the largest and consisted of seven maintainer lines. Among them, maintainer lines BRRI52B and BRRI60B were the most closely associated. Cluster II represents diverse sources of materials and its revealed non-correspondence of geographic diversity with genetic divergence. Thus the cluster analysis has revealed the genetic variation and the traits contributing for the variation. Hence, these maintainer lines can be utilized for trait improvement in breeding programmes for the traits contributing to major variation.

Keywords: Maintainer line, Genetic variability, Qualitative traits

Location:

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

Hence, keeping the importance of hybrid rice and scant literature on these aspects, the present investigation was undertaken as a first attempt with the objective of variability assessment of different maintainer lines for hybrid rice development based on qualitative traits.

Methodology:

Present investigations were conducted at the Bangladesh Rice Research Institute (BRRI) farm, Gazipur. Nineteen maintainer lines were characterized for 13 qualitative traits. Among them, 17 maintainer lines were developed locally and two of them namely IR78355 IR75595 originated from International Rice Research Institute (IRRI). The experiment was laid out in a randomized complete block design (RCBD) with three replications during T. Aman season 2015. The BRRI developed maintainer lines were BRRI19B, BRRI20B, BRRI22B, BRRI25B, BRRI42B, BRRI52B, BRRI55B, BRRI60B, BRRI63B, BRRI67B, BRRI69B, BRRI70B, BRRI71B, BRRI73B, BRRI76B, BRRI79B, BRRI81B. The maintainer lines originated from IRRI were IR75595B, IR78355B. Twenty-one-day old seedlings were transplanted at the rate of one seedling per hill with the plant to plant distance of 15 cm and row to row distance of 20 cm. The standard cultivation practices prescribed for hybrid rice were followed precisely. Observations on maintainer lines were recorded for 13qualitative traits viz ligule colour, ligule shape, auricle colour, collar colour, blade colour, blade pubescence, basal leaf sheath colour, susceptibility to BLB, angle of flag leaf, stigma colour, awn: distribution, panicle exertion, and seed coat colour. The phenotypically distinguishable qualitative traits are used as a preliminary tool for assessing genetic variability. These characters were scored based on ‘Descriptors for cultivated rice (Oryza sativa L.)’ developed by GRSD, BRRI (2018). Ten random plants from each entry were selected for recording observations. Frequency distributions for all of the qualitative traits were computed. Cluster analysis was done to group the genotypes into a dendrogram by using PAST software.

Source of Information: Bangladesh Rice J. 22 (2) : 79-87, 2018,

Article Link (Online Journal): doi.org/10.3329/brj.v22i2.44045

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study shows a considerable level of variability among the studied maintainer lines. It interprets a considerable amount of morphological variation along with the qualitative traits of maintainer lines. The results show that cluster I, cluster III and IV represented only BRRI developed maintainer lines but cluster II represented both BRRI and IRRI developed maintainer lines. The genotypes from the same geographical origin mostly grouped together; however, the less frequent genotypes from different origins also grouped within the same cluster. The selection of parents for hybridization from different clusters will provide more variability and a high heterotic effect. Among the 13 traits, panicle exsertion and flag leaf angle are considered as important traits for hybrid rice development and selection could be done considering these traits.

Knowledge Management: Journal