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Genetic Variability for Grain Yield and Yield Associated Traits in Transplant Aman Rice (oryza Sativa L.)

Mashtura Begum
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

Md. Amir Hossain
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Fakir Muhammad Munawar Hossain
Planning Commission, Senior Assistant Secretary, Government People’s Republic of Bangladesh, Dhaka, Bangladesh

Ahmed Khairul Hasan
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

For any crop improvement program, it is imperative to assess the grain yield progress of the existing crop varieties to find the further avenue to out yield the existing superior ones. Therefore, an experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from July to December 2013 to find out the genetic variation for grain yield and their associated traits of transplant Aman rice varieties. The experiment consisted of 11 varieties viz. Bashiraj, Binadhan-7, BR10, BR11, BR22, BR23, BRRI dhan32, BRRI dhan39, BRRI dhan49, BRRI dhan57 and IR64. The high yielding Bangladeshi varieties were selected based on their releasing year with a local and one exotic T. Aman rice varieties. Among the varieties, BR10 produced the highest grain yield (3.83 t ha ^-1 ). Binadhan-7 rice variety recorded the highest chlorophyll content (39.93 SPAD value) at 29DAT, (44 SPAD value) at 39 DAT and (47.30 SPAD value) at 49 DAT. The highest phenotypic (1491.81) and genotypic (1147.26) variances and genetic advance (61.19) were obtained from spikelets panicle ^-1 and this parameter had greater ability to increase yield. Among the traits, the highest heri tability was recorded by effective tillers hill ^-1 (87.91%) which influenced the grain yield. Therefore, it may be concluded that the variety BR10 of transplant Aman rice produced maximum grain yield, spikelets panicle ^-1 , showed high phenotypic and genotypic variances and genetic advance. Bashiraj, BRRI dhan49 and BRRI dhan57 also can be considered as planting materials as their yield performance is close to BR 10. Therefore, the findings of the present study will help the breeders for further yield improvement of rice.

Keywords: Phenology of rice, Chlorophyll content, G X E interaction, Genetic advance

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-07-2013

End Date: 00-12-2013

Program Area: Variety and Species

Commodity: Rice

Objectives:

To analyze the genetic variations in transplant Aman rice varieties for their yield and yield associated traits.

Methodology:

The research was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from July to December, 2013. One experimental factor was included in the study, namely, variety. Among the varieties one is local (Bashiraj), one is exotic (IR64) and the others ( Binadhan-7, BR10, BR 11, BR22, BR23, BRRI dhan32, BRRI dhan39, BRRI dhan49, BRRI dhan57) are Bangladeshi high yielding T. Aman rice varieties. They were selected as the representative variety in terms of their popularity during different years in Aman season. The experiment was laid out in a randomized complete block design with three replications. The area of each unit plot was 2.5m x 2.0m . The total number of unit plots was 33.The recommended doses of fertilizers were 110, 40, 50, 37 and 5g/5m² of urea, triple super phosphate, muriate of potash, gypsum and zinc sulphate, respectively. All the fertilizers except urea were applied at the time of final land preparation. Urea was top dressed in three equal splits at 15, 35 and 55 days after transplanting (DAT).Intercultural operations were done for maintaining the normal growth and development of the crop. During the crop cycle, the dates of booting, heading, anthesis and physiological maturity were recorded. Randomly five leaves were selected on each plot and Chlorophyll content was measured by the chlorophyll meter (SPAD meter) at 29, 39 and 49 DAT. Five sample plants were randomly chosen from each plot for recording observations on some yield contributing characters viz. plant height (cm), number of total tillers hill ^-1 , number of effective tillers hill ^-1 , number of non-effective tillers hill ^-1 , panicle length (cm), number of spikelets panicle^-1 , number of sterile spikelets panicle ^-1 , grain yield (t ha ^-1 ), straw yield (t ha ^-1 ). The collected data were analyzed statistically with the help of a computer package MSTAT. The mean differences among the treatments were adjudged with Duncan's Multiple Range Test.

Source of Information: Res. Agric. Livest. Fish. Vol. 2, No. 2, August 2015: 207-213, ISSN : P-2409-0603

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of this research indicated that considering the entire yield contributing characters the variety BR10 produced maximum grain yield and followed by Basiraj and BRRI dhan49 and BRRI dhan57. In order to improve grain yield the characters spikelets per panicle, plant height, panicle length, number of effective tiller per hill are more responsible. The characters spikelets per panicle, number of sterile spikelets per panicle, plant height and panicle length are attributed to additive gene effects which indicating that improvement in theses character is possible through hybridization followed by selection. The character number of effective and non-effective tiller per hill with high heritability with low genetic advance indicating the character is influenced by environmental effects and selection may not be useful.

Knowledge Management: Journal