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Inheritance of Recovery from Submergence in a 5 X 5 Diallel Analysis in Rice

M S Pathan
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

N M Miah
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

M E Haque
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

H C Sarkar
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

R K Das
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

M Hoque
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

Abstract/ Executive Summary:

Inheritance of recovery from submergence in rainfed lowland rice was studied by analysing the combining ability and estimating the genetic parameters. BR5, Nizersail, Kumragoir, Dudmona, FR13A and their 10 F_l hybrids, constituting a 5 x 5 half diallel set, were used in the study. Estimates of genetic parameters and combining ability analysis showed significant additive and non-additive gene effects, former effects being higher than the latter. Partial dominance of submergence recovery potential was indica ted by covariance-variance regression graph and estimated dominance ratio. Partial dominance for this trait was offered by one major gene or block of genes. Dominant and recessive genes were in unequal proportion in the parents and some degree of gene asymmetry existed in favour of recessive alleles. Among the parents, FR13A and Kumragoir showed favourable general combining ability (gca ) effects and Nizersail the least. Narrow-sense heritability of 0.697 indicated the importance of additive gene action in submergence recovery.

Keywords: Inheritance of Recovery, Submergence , Diallel Analysis, Rice

Location: BRRI, Gazipur

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

To determine the inheritance and to estimate the genetic parameters for submergence recovery ability in five rainfed lowland rice varieties through diallel analysis.

Methodology:

Five rainfed lowland rice varieties, viz BR5, Nizersa 1l, Kumragoir, Dudmona, FR13A and their 10 F₁ hybrids obtained from one way diallel cross, were used to study the inheritance of recovery from submergence. The experiment was conducted at the Bangladesh Rice Research Institute (BRRI),Gazipur. Ten 30-day-old seedlings of each entry were transplanted in a cemented water tank following randomized complete block design with three replications. Seven days after transplanting (DAT), the seedlings were artificially submerged for 10 days in semiturbid water at 50 cm depth above the soil. After the submergence period, water was drained off and the plants were allowed to recover for another 10 days. The recovery score (1-9) was recorded from five randomly selected plants based on the phenotypic appearances following the Standard Evaluation System (SES) of IRRI where 1 indicated highly recovered and 9 the susceptible. Phenotypic scores were used in the statistical analysis. The estimates of additive dominance model and gene tic parameters were computed and variance for general combining ability (gca), specific combining ability (sea) and its effects were computed.

Source of Information: Bangladesh Rice J. 6(1&2) : 1-5, 1995, ISSN 1025-7330

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Partial dominance of submergence recovery potential was indicated by covariance-variance regression graph and estimated dominance ratio. Partial dominance for this trait was offered by one major gene or block of genes. Dominant and recessive genes were in unequal proportion in the parents and some degree of gene asymmetry existed in favour of recessive alleles. Among the parents, FR13A and Kumragoir showed favourable general combining ability (gca ) effects and Nizersail the least. Narrow-sense heritability of 0.697 indicated the importance of additive gene action in submergence recovery.

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