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Yield of Inbred and Hybrid Rice as Affected by Clonal Tillers of Successive Generation

P. K. Hore
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

P. K. Biswas
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

A. K. M. R. Amin
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Raziuddin
Scientific Officer,
Regional Agricultural Research Station, BARI, Rahamatpur, Barishal, Bangladesh

M. S. Mahmud ,
Research Associate
Collection, Evaluation and Introduction of White Maize for Human Consumption in Bangladesh, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh

S. M. Mohsin
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted at the Agronomy field, Sher-e-Bangla Agricultural University, Dhaka from November 2012 to July 2013. Experiment consisted of two factors, viz. (i) variety- BRRI dhan29 (V1) and BRRI hybrid dhan2 (V2), and (ii) planting materials- nursery seedlings (N), first generation clonal tillers (C1) collected from N, second generation clonal tillers (C2) collected from C1, third generation clonal tillers (C3) collected from C2 and fourth generation clonal tillers (C4) collected from C3, following split-plot design with three replications. Results revealed that despite higher (161.29) number of filled grains as obtained from BRRI dhan29 while lower (139.31) from BRRI hybrid dhan2, and maximum weight of 1000-grains (26.50 g) from hybrid variety and the minimum from the inbred one (19.70 g), the grain yield was not varied significantly. Among the planting materials nursery seedlings gave the maximum (9.23 t ha^-1) grain yield that followed by first generation clonal tillers (7.44 t ha^-1), and second generation clonal tillers (6.57 t ha^-1). The third and fourth generation clonal tillers also produced around 3 t ha^-1 grain yield. The maximum grain yield (9.6 t ha^-1) was observed from the combination of nursery seedlings with BRRI hybrid dhan2 which is statistically similar to the combination of same planting material with BRRI dhan29 (8.86 t ha^-1). The first and second generation clonal tillers of both the varieties produced more than 6.0 t ha^-1 grain yield. Therefore, clonal tillers can be used as planting materials for both hybrid and inbred rice cultivation in case of scarce supply of nursery seedlings.

Keywords: Inbred, Hybrid, Rice, Clonal tillers, Yield

Location: Sher-e-Bangla Agricultural University, Dhaka-1207

Start Date: 00-12-2012

End Date: 00-07-2013

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To compare the yield performance of the crop grown from their inbred and hybrid clonal tillers of successive generation and nursery seedlings

Methodology:

The experiment was conducted at the Agronomy field of Sher-e-Bangla Agricultural University, Dhaka-1207 during the period from December 2012 to July 2013. The experimental area was situated at 23°77¢N latitude and 90°33¢E longitude at an altitude of 8.6 meter above sea level (Anon., 2004) belongs to the Agro-ecological zone of “The Modhupur Tract”, AEZ-28 (Anon., 1988). The experiment was comprised of variety (V₁ = BRRI dhan29 and V₂ = BRRI hybrid dhan2) and planting materials (N= nursery seedlings, C₁= first generation clonal tillers collected from, C₂ = second generation clonal tillers collected from C₁, C₃ ₌ third generation clonal tillers collected from C₂ and C₄ = fourth generation clonal tillers collected from C₃ ). The experiment was laid in a split-plot design with three replications having variety in the main plots and planting materials in the sub-plots. The size of unit plot was 5.0 m by 2.0 m. Seeds were sown on the seedbed on November 12, 2013 for raising nursery seedlings. 33 days old nursery seedlings were uprooted carefully on December 15, 2012 and were kept in soft mud in shade. The seedlings were then transplanted with 25 cm × 15 cm spacing on the well-puddled plots. Two sub-plots in each main plot was transplanted with nursery seedlings of which the entire hills of one plot was uprooted and splitted for using as first generation clonal tillers. The separated tillers were then re-transplanted as per treatment having one clonal tiller per hill on 30 January, 2013. Second generation (C₂) clonal tillers were separated from C₁ plants at 30 DAT and the separated tillers were then re-transplanted as per treatment having one clonal tiller hill^-1 on 2 March, 2013. Third generation (C₃) clonal tillers were separated from C₂ plants as earlier at 25 DAT and the separated tillers were then re-transplanted as per treatment having one clonal tiller per hill on 27 March, 2013. Lastly the fourth generation (C₄) clonal tillers were separated from C₃ plants at 20 DAT and the separated tillers were then re-transplanted as per treatment having one clonal tiller hill^-1 on 17 April, 2013. Before re-transplanting, the individual plots were spaded properly for well puddle and an extra dose of urea (one third of basal) was top dressed after seven days of re-transplanting on uprooted plots and entire basal dose for newly transplanted plots. Maturity of crop was determined when 90% of the grains become golden yellow in color. The harvesting of BRRI dhan29 was done on May 12; Jun 3; Jun 14; Jul 1, 2013 for nursery seedlings (N) and first generation clonal tiller (C₁); second generation clonal tiller (C₂); third generation clonal tiller (C₃) and fourth generation clonal tiller (C₄), respectively and the harvesting of BRRI hybrid dhan2 was done on May 4; May 21; Jun 14; Jul 1, 2013 for nursery seedlings (N) and first generation clonal tiller (C₁); second generation clonal tiller (C₂); third generation clonal tiller (C₃) and fourth generation clonal tiller (C₄), respectively. The grains were cleaned and sun dried to moisture content of about 12%. Straw was also sun dried properly. Finally grain and straw yields plot^-1 were recorded and converted to t ha^-1. All the data collected on different parameters were statistically analyzed and the mean differences were adjudged by least significant difference (LSD) test at 5% level of significance (Gomez and Gomez, 1984).

Source of Information: Bangladesh Agron. J. 2016, 19(1): 59-66

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results of the experiment revealed that the yield of rice was identical between the inbred variety BRRI dhan29 and hybrid variety BRRI hybrid dhan2 though the crop grown from nursery seedlings produced the highest yield over that from the clonal tillers of successive generations. The highest grain yield and harvest index (9.60 t ha^-1 and 54.00%, respectively) were observed from nursery seedlings of BRRI hybrid dhan2 and the lowest from third generation clonal tillers of BRRI hybrid dhan2 (2.57 t ha^-1 and 48.90%, respectively). So the clonal tillers can be used up to second generation with little sacrifice of yield irrespective of inbred and hybrid rice.

Knowledge Management: Journal