Correlation and Path Analysis of Morphological and Grain Yield Traits in Iranian Rice Genotypes under Drought Stress Conditions

Author: Headar Aghaei, Nadali Babaeian Jelodar and Nadali Bagheri

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Abstract

Drought stress is a major factor limiting rice production and cause severe threat to rice production. Studying causal relationships of morphological traits and analysis of relationships between grain yield as dependent trait and morphological traits as independent traits of rice is a useful way to finding out genetic basis of drought tolerance. For this purpose, an experiment was conducted to determine analysis of relationships between grain yield as dependent trait and morphological traits as independent traits in rice Iranian rice genotypes. The study was conducted using a factorial RCBD design with three replications under greenhouse condition. The experimental factors were different levels of drought stress (non-stress, drought stress with re-irrigation and drought stress without re-irrigation) and rice genotypes. The result of correlation among measured traits under drought stress with re-irrigation and without re-irrigation (severe drought tolerance) showed that grain yield had a

Keywords

Oryza sativa, correlation, path analysis, drought stress, re-irrigation

Conclusion

Drought stress is a major factor limiting rice production and cause severe threat to rice production. Studying causal relationships of morphological traits and analysis of relationships between grain yield as dependent trait and morphological traits as independent traits of rice is a useful way to finding out genetic basis of drought tolerance. For this purpose, an experiment was conducted to determine analysis of relationships between grain yield as dependent trait and morphological traits as independent traits in rice Iranian rice genotypes. The study was conducted using a factorial RCBD design with three replications under greenhouse condition. The experimental factors were different levels of drought stress (non-stress, drought stress with re-irrigation and drought stress without re-irrigation) and rice genotypes. The result of correlation among measured traits under drought stress with re-irrigation and without re-irrigation (severe drought tolerance) showed that grain yield had a

References

As there are many traits affecting grain yield, splitting the total correlation into direct and indirect effects of cause would give more understanding to the cause of relationship between the yield as dependent trait and independent trait such as yield component traits (Nandan et al., 2010). Since, number of filled grains per panicle had the highest significantly positive direct effect (0.714**) on grain yield in the drought stress without re-irrigation and also showed a significant positive correlation with grain yield under the two drought conditions, therefore, this trait can be used as a useful indicator for indirect selection of grain yield in screening for drought tolerance in drought breeding programs. In a study, Chavan and Lal (2014) reported a positive direct effect of number of seeds per panicle and percent filled grains traits on yield under drought condition.

How to cite this article

Headar Aghaei, Nadali Babaeian Jelodar and Nadali Bagheri (2017). Correlation and Path Analysis of Morphological and Grain Yield Traits in Iranian Rice Genotypes under Drought Stress Conditions. Biological Forum – An International Journal 9(2): 23-27