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Interrelationships Among Grain Yield and Related Traits of Candidate Restorer Lines of Brassica Napus L.

A. K. M. Aminul Islam
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

N. K. Chowdhury
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

F. M. Era
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

M. G. Rasul
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

Abstract/ Executive Summary:

Forty-three candidate restorer lines of Brassica napus were evaluated for 11 agronomic traits for genetic variability and interrelationships among yield traits to find out yield contributing traits. A wide range of variability and character association was observed among the lines. The line BNR-017 took the lowest time for first (26.67 days) and 100% flowering (41.00 days) whereas BNR-031 (74.33 days) and BNR-034 (74.00 days) matured earlier. The lines BNR-022 (1.07m) and BNR-026 (1.02m) were found with the shortest plant stature and all other lines were an average plant height of around 1.35m. The lines BNR-039, BNR-011, BNR-001, BNR-013, and BNR-014 were found the best performer for the number of pods per plant, seeds per pod, and seed yield per plant. Estimates of genotypic and phenotypic coefficient of variation were high (≥30%) for seed yield per plant (30.52 and 33.13, respectively). High broad-sense heritability was recorded for the 1000-seed weight (97.69%), days to ripening (97.12%), days to first flowering (96.80%), days to 100% flowering (95.50%), and pod length (92.74%). A significant and negative correlation was observed between seed yield per plant and number of seeds per pod, -0.217* and -0.192*, respectively both at the genotypic and phenotypic level, while the highest positive and significant genotypic (0.786**) and phenotypic (0.795**) correlation were found with pod length. Path co-efficient analysis showed the highest positive and direct phenotypic effect of the number of seeds per pod (1.221) on seed yield per plant while days to first flowering had the maximum negative direct effect (-0.039). The results of genotypic and phenotypic coefficient of variation, heritability and genetic advance in percent of the mean, correlation co-efficient and path co-efficient revealed that pods per plant, pod length, seeds per pod, and 1000-seed weight could be used as selection criteria to increase seed yield in rapeseed.

Keywords: Mustard, Genetic variability, Heritability, Male sterility, Hybrid, Seed yield.

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

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Mustard

Objectives:

The objectives of the present research are (i) to identify elite restorer lines from the segregating populations of exotic Brassica napus hybrid, and (ii) to characterize the selected restorer lines for agronomic traits.

Methodology:

The seeds of 43 candidate restorer lines obtain from segregating populations (F₆ and later) of exotic hybrids including three checks (BARI sharisha-8, BARI sharisha-13, and Tori-7) were used as plant materials. present research work was conducted at the experimental farm, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur. The location of the experimental site was at the center of Madhupur Tract (24.05’N latitude and 90.25’E longitude) with an elevation of 8.4m from the sea level. The soil type of experimental field belongs to the Shallow Red Brown Terrace type under Salna series of Madhupur Tract (Brammer, 1971; Saheed, 1984) of Agro-Ecological Zone (AEZ) 28. The land was prepared thoroughly by 3-4 time ploughing and cross ploughing followed by laddering. The land was finally prepared by the addition of a basal dose of fertilizers. Adequate soil fertility was ensured by applying additional quantities of N-P-K-S-Zn-B @ 120-35-65-20- 5-1.5 kg/ha, respectively. Total TSP, MP and Gypsum, Zink Sulphate, and Boric Acid were applied in final land preparation (Halder et al., 2007). Cow dung was also applied during final land preparation @ 10 MT/ha. Total urea was applied in three installments at 15, 30, and 50 days after sowing (DAS). Seeds of 43 lines were sown in the row spacing of 30 cm and plant spacing of 15 cm within the row using randomized complete block design with three replications. The seedlings were emerged out within four days after sowing. Necessary intercultural operations were taken during the cropping period for proper growth and development of the plants. Irrigation was given at 15 days intervals and when necessary. Malathion 57 EC was applied three times as foliar spray at an interval of 10-15 days after seedling emergence to control aphids. Ten randomly selected competitive plants from each of the entries were used for recording the data on days to 1^st flowering, days to 100% flowering, days to 1^st ripening, plant height, number of branches per plant, number of pods per plant, pod length, no. of seeds per pods, number of seeds per plant, 1000-seed weight and seed yield per plant. The recorded data for different characters were analyzed statistically using SAS (SAS, 2010). Genotypic and phenotypic variances were estimated according to the formula given by Johnson et al. (1955). Genotypic, phenotypic and environmental co-efficient of variation were estimated by the formula suggested by Burton (1952). Genotypic and phenotypic correlation co-efficient for all possible combinations was calculated by the formula suggested by Miller et al. (1958), Johnson et al. (1955) and Hanson et al. (1956). OPSTAT software was used for analyzing genotypic and phenotypic correlation co-efficient. Genotypic correlation co-efficient was further partitioned into components of direct and indirect effects by path co-efficient analysis originally developed by Dewey and Lu (1959) and worked example by Sheoran et al. (1998).

Source of Information: Ann. Bangladesh Agric. (2020) 24 (1) : 51-64

Article Link (Online Journal): www.doi.org/10.3329/aba.v24i1.51935

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

For rapeseed breeding, the variables pods per plant, seeds per pod, and 1000-seed weight were found with a maximum potential of selection for yield improvement because these traits possessed high h²b, highly significant positive correlation, and maximum positive direct effects with seed yield per plant.

Knowledge Management: Journal