Capel Dev Biswas, Bhobendra Kumar Biswas, Md. Abu Sadat, Md. Zablul Tareq and Parth Sarothi Saha*

*Corresponding address E-mail: parth.saha@outlook.com


Drought stress can occur in any stage of growth and severely affect the yield of rice. Rain-fed rice cultivation system is hindered due to drought stress and this affects national economy of Bangladesh. Drought tolerance in vegetative stage is important for the later stages of development leading to productivity. In this study, we have analyzed some selected traits involved in drought tolerance mechanisms at the Department of Genetics and Plant Breeding, Haji Mohammad Danesh Science and Technology of Bangladesh in 2011. We have used one African drought tolerant rice variety Nerica4, one drought susceptible rice variety BRRI dhan28 and one semi dwarf rice variety Parizat in our current research and evaluated selected traits including the progenies. Shoot and root characters were been considered as heritable traits. We found that Nerica4 had higher plant height (112 cm) followed by BRRI dhan28 (108 cm). Crossing of these two parents produced population with moderate plant height (118 cm and 81 cm) in F1 and F2, respectively. However, no relationship was observed among the plant height, tiller number and shoot dry weight. Plant height was found to be controlled by complete dominance. Interestingly, F1 and F2 populations of the cross of Parizat and Nerica4 showed the highest root length. BRRI dhan28 showed the highest root length (26.48 cm) among the parents. These results clearly indicate that, combination of additive and dominance effect was not sufficient and segregation and recombination might be affected by environmental factors. However, positive correlation was found between root thickness and root xylem vessel number. Considering the above characteristics, the population arisen from the Parizat and Nerica4 cross may be used to develop drought tolerant rice variety(ies).

Keywords: Drought tolerance, rice, root xylem, root thickness, additive effect, dominance effect and heritability.

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J. Expt. Biosci.9(2) July 2018

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