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Heterosis of Yield and Its Contributing Characters of T-aman Rice (oryza Satival)

P. C. Roy
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

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

M. A. H. Molla
Department of Genetics and Plant Breeding Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur 1706, Bangladesh

Abstract/ Executive Summary:

The investigation was undertaken to study heterosis over better parent, heterosis over mid parent, reciprocal effects in eight crosses, their reciprocals and parents of T. Aman rice genotypes. Maximum traits showed heterosis in desirable direction of which the hybrid FR-13A × Arman sarder performed the best towards shorter stature, yield components like tiller number, panicle length, filled grains per panicle and 100-grain weight. The hybrid FR-13A × PJT (st) showed significant and positive heterosis over better parent for plant height, number of tillers per hill, grains per panicle and yield per hill which performed the best in terms of both physical as well as yield contributing traits. Considering heterosis over mid parent, the hybrid FR-13 A × Arman Sarder performed the best showing heterosis in desirable direction on maximum number of traits namely tiller number, panicle length, filled grains per panicle, harvest index and yield per tiller. Most of the hybrids showed maternal effects but the cross FR-13 A × PJT (st) had no maternal effects for 100 grains weight.

Keywords: Rice, Heterosis, Better parent, Mid parent, Reciprocal effect

Location: Experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Start Date: 00-07-2007

End Date: 00-01-2009

Program Area: Variety and Species

Commodity: Rice

Objectives:

To study heterosis over better parent, heterosis over mid parent, reciprocal effects in eight crosses, their reciprocals and parents of T. Aman rice genotypes.

Methodology:

The experiment was carried out at the experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur during July 2007 to January 2009. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Five rows of 4 m each constituted the experimental unit. Twenty five treatments were distributed in the experimental unit through randomization by using the IRRISTAT programme. Nine genotypes were used as parent material. Eight crosses and their reciprocals were made during first year (July 2007 to December 2007) of the experiment. In this case, the genotype FR-13A was used as both male and female for crossing with other genotypes. Then the experiment was conducted in the next year (July 2008 to January 2009) using eight crosses, their reciprocals and parents. Healthy seedlings of 30 days old were transplanted in separate strips of the experimental field. In each strip 20 cm × 20 cm spacing between plant to plant and row to row, respectively were maintained. The overall mean value for each parent or hybrid in all the three replications for each character was taken for the estimation of heterosis. Heterosis was calculated as percent deviation of the FI hybrid from the mid parental value between two corresponding parents. The magnitude of heterosis was expressed as heterosis over better parent (BP) and heterosis over mid parent (MP) for 15 traits.

Source of Information: Bangladesh J. Pl. Breed. Genet., 23(1): 01-07, 2010

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Reciprocal effect for yield per ha was observed for all the crosses studied. Among the crosses, four cross combinations had positive effect while other four crosses the effect was negative. This might be happened due to cytoplasmic maternal effect in either direction.

Knowledge Management: Journal