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Morphological Characterization of Resynthesized Brassica Napus L. Lines Giving Priority to Earliness

Most. Mahmuda Akter
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Afsana Hannan
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Priya Ghosh
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Gour Gobindo Das
Department of Agricultural Extension, Ministry of Agriculture, Bangladesh

G H M Sagor
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted to evaluate the performances of fifteen resynthesized Brassica napus L. lines along with one check variety (Binasarisha-4) based on some morphological, yield and yield attributes and also to estimate association among the traits. Randomized Completely Block Design (RCBD) with three replications was used for this experimentation. A wide range of variation was observed among the studied morphological traits which have a great interest for the Brassica breeders. Considering the two most important traits like early flowering and early maturity the RS lines RS-7, RS-2, RS-3, RS-5, RS-11, RS-14, and RS-15 performed best among the germplasms compared with check variety Binasharisha-4. All the studied traits except main leaf area showed high heritability. High heritability coupled with high genetic advance in per cent of mean (>20%) was observed for plant height, flag leaf area, siliqua length, beak length, siliqua angle and yield/plant. This result suggested that these characters could be improved more easily through simple selection. Correlation analysis revealed a significant positive correlation of yield/plant with plant height and siliqua length. Days to first flowering and days to maturity were negatively correlated with plant height, siliqua length and beak length whereas a highly significant positive correlation existed between days to first flowering and days to maturity. Principal Component Analysis revealed the utmost suitable combination of the studied attributes and stated that the first four principal components (PC) explained 78.3% of the total data variation. These results provide a scope for selection of RS lines in regard to develop short duration varieties of B. napus with high yield potential.

Keywords: Brassica napus L., Resynthesized line, Morphological traits, Genetic variability, Correlation, Principal Component Analysis

Location: Department of Genetics and Plant Breeding (GPB), Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh

Start Date: 00-11-2018

End Date: 00-03-2019

Program Area: Variety and Species

Commodity: Flower

Objectives:

To evaluate the yield and yield contributing traits of resynthesized lines of B. napus giving emphasis on early maturity for finding out some novel genetic resources thus helping out to develop short duration B. napus varieties.

Methodology:

This experiment was performed during winter season (November 2018 to March 2019) using the experimental field of Department of Genetics and Plant Breeding (GPB), Bangladesh Agricultural University (BAU), Mymensingh. The experimental materials consisted of 15 resynthesized (RS) Brassica napus lines (RS-1 to RS15) and one of the most popular varieties of Brassica napus (Binasharisha-4) as a check variety. Experimental materials were collected from GPB, BAU, Mymensingh. In this experiment, Agrani, Binasarisha-6, Safal, Sampad, BARI Sarisha-15, BARI Sarisha-6, BARI Sarisha-9, BARI Sarisha-12 of B. rapa and Alboglabra-1 of B. oleracea var. “alboglabra” were used as parental genotypes for the development of interspecific hybrids. Interspecific hybrids were induced to double chromosome number for the development of synthetic B. napus. Seeds of all selected RS lines of B. napus along with the check variety were sown on the experimental plot to assess some morphological characters, seed yield and yield attributes. The experiment was conducted using Randomized Complete Block Design (RCBD). Each plot contained 5 rows with 12 plants in each row. Harvesting was done when 90% of the plant population of each plot reached to maturity. Data were recorded on three randomly chosen plants of each genotype for different characters, such as plant height, flag leaf area, and main leaf area, days to first flowering, siliqua length, beak length, main stem length, siliqua angle, days to maturity, and seed yield/ plant. Statistical analyses of the recorded data for different characters were performed using MINITAB17 statistical software packages (Minitab Inc., State College, Pennsylvania, NZ). Two-way Analysis of Variance (ANOVA) was executed for different yield and yield contributing traits following general linear model (GLM). Principle Component Analysis (PCA) was carried out to investigate association between the traits of RS lines and check variety of B. napus. The principle component (PC) scores were stored and ANOVA of the PC scores was performed using the GLM procedure to explore the statistical significance between variety and replication. A correlation analysis was performed to explore relationship among the traits. Estimation of genotypic and phenotypic variances, heritability in broad sense (h2b) as well as categorization of h2b and genetic advance (GA) was done according to the formula given by Johnson et al. (1955) and Hanson et al. (1956). Genetic advance in percent of mean was calculated by the formula of Comstock and Robinson (1952). GA (%) was categorized as low (0-10%), moderate (10-20%) and high (≥20%) as given by Johnson et al. (1955) and Falconer and Mackay (1996). Genotypic Coefficient of Variation (GCV) and Phenotypic Coefficient of Variation (PCV) values were estimated according to the formula given by Burton (1952). GCV and PCV values were categorized as low (<10%), moderate (10-20%) and high (>20%) (Sivasubramanian and Madhavamenon, 1973).

Source of Information: J Bangladesh Agril Univ 18(1): 94–100, 2020

Article Link (Online Journal): https://doi.org/10.5455/JBAU.80770

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The objective of this study was to evaluate some morphological, yield and yield contributing traits of resynthesized B. napus lines with a check variety giving priority to the character of earliness. The RS lines performed better for the traits plant height, siliqua length, main fruiting axis length, siliqua angle, seed yield/plant, days to first flowering and days to maturity over check variety. Considering the two most important traits like early flowering and early maturity to assess earliness, the RS lines RS-7, RS-2, RS-3, RS-5, RS-11, RS-14 and RS-15 performed best among the germplasms compared with check variety Binasharisha-4. However, it needs further screening and evaluation in the subsequent generations in respect of morphological, higher yield and yield contributing traits.

Knowledge Management: Journal