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Genetic Analysis of F4 Rice Lines for Salt Tolerance at the Reproductive Stage

S. Akhtar
Department of Genetics and Plant Breeding, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M. M. Islam
Plant Breeding Division, Bangladesh Institute of Nuclear Agriculture, Mymensingh-2202, Bangladesh

S. N. Begum
Department of Genetics and Plant Breeding, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

J. Halder
Department of Genetics and Plant Breeding, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M. K. Alam
Department of Genetics and Plant Breeding, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

A. C. Manidas
Department of Genetics and Plant Breeding, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A total of 29 lines of F₄ population of rice along with their parents Binadhan-5 (high yielding and salt susceptible) and Harkuch (salt tolerant landrace) were evaluated for salt tolerance at the reproductive stage with EC 6 dS/m following IRRI standard protocol. High heritability coupled with high genetic advance was observed in plant height in salinized and non-salinized conditions. High heritability along with high genetic advance was also found in number of filled grains/plant in saline condition. These characters were under additive gene control and selection for salt tolerance might be effective. Number of filled grains/plant showed significant positive correlation with grain yield/plant. Path analysis revealed that number of filled grains/plant had positive and maximum direct effect on grain yield/plant. Therefore, number of filled grains/plant should be given the importance in selection of rice lines under saline condition.

Keywords: Rice, Reproductive stage, Salt tolerant, Variability, Correlation, Path coefficient

Location: Plant Breeding Division at Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh 2202.

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

to find out and established suitable selection criteria for screening rice germplasm under salinized and nonsalinized condition at reproductive stage.

Methodology:

This study was conducted in Plant Breeding Di vision at Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh 2202. A cross was made between high yielding Binadhan-5 and salt tolerant landrace Harkuch and subsequently F₁, F₂ and F₃ were obtained. In this study, a total of 29 F₄ lines along with their parents (Binadhan-5 and Harkuch) were used. The trial was conducted in randomized complete block design (RCBD) with three replications under salinized and nonsalinized conditions. Pregerminated seeds were sown in perforated glass fibre pots filled with fertilized soil and placed in the glass fibre tanks. Water level was maintained at 3 cm below the soil surface for 2 days. Five seeds of each genotype were sown in each pot and after establishment thinning was done keeping 3 seedlings per pot. Two weeks after seeding water level was raised to about 1-2 cm above the soil surface. When the seedlings were 21-day old, water was siphon out of the trays for 24 hrs followed by instantly prepared salinized water solution (up to EC 6 dS/m) by dissolving crude salt was added to the trays for salinized setup. Simultaneously, tap water was added to the trays for control setup (non-salinized condition). The EC of the salinized water was monitored every week and adjusted when necessary using crude salt and tap water. Rice yield and yield component data were recorded at reproductive stage in both nonsalinized and salinized conditions. Genotypic and phenotypic coefficients of variation and heritability in broad sense estimated. he path and correlation analysis were conducted.

Source of Information: Progress. Agric. 21(1 & 2): 31–38, 2010 ISSN 1017-8139

Article Link (Online Journal): http://www.banglajol.info/bd/index.php/PA/article/view/16746/11782

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

High heritability along with high genetic advance was also found in number of filled grains/plant in saline condition. However, Salinity screening under controlled condition has the benefit of reduced environmental effects. These characters were under additive gene control and selection for salt tolerance might be effective. Number of filled grains/plant showed high genotypic (35.75%) and phenotypic (45.28%) co-efficient of variation in saline condition but moderate genotypic (12.61%) and high, which is phenotypic (30.14%) co-efficient of variation were found in non-salinized condition.significant positive correlation with grain yield/plant. Path analysis revealed that number of filled grains/plant had positive and maximum direct effect on grain yield/plant. Therefore, number of filled grains/plant should be given the importance in selection of rice lines under saline condition, which makes the direct and indirect effects of number of filled grains/plant were the highest and positive upon grain yield/plant, while, plant height, days to maturity and 1000 grain weight had negligible direct and indirect effects on grain yield/plant. Hence, number of filled grains/plant could be considered to play a major role on determining grain yield/plant in rice under saline environment and direct selection through this trait would be effective. The above findings with genetic variability, correlation and path coefficient analysis clearly indicated that the number of filled grains/plant is the determining trait for grain yield under salt stress and this trait can serve as indicator in selecting rice lines for salt tolerance.

Knowledge Management: Journal