Evaluating the Impact of Bakanae Disease on Leaf Gas Exchange Physiology of Rice in Resistant and Susceptible Genotypes

Author: Jagdish Yadav, Ashok Kumar Mahawer, Amit Kumar Kesharwani, Prashantha S.T. and Oinam Washington Singh

Download PDF

Abstract

Rice is the one main source of nutrition for a larger part of world population but a significant proportion of rice production is lost every year due to various and biotic stress factors. Bakanae disease is an emerging and serious threat to rice production and the remedies are needed of the bakanae disease otherwise it can be a destructive disease. The leaf gas exchange activities are seriously affected by any stress to normal plants. In present study the impact of bakanae disease on various leaf gas exchange activities of rice in two contrasting (resistant & susceptible) genotypes was studied. It was observed that pathogen inoculation inhibited the germination, increased the plant height and decreased the root length in susceptible genotype with no significant changes in resistant genotype. The leaf gas exchange activities were was initially increased in inoculated plants but later it was decreasing as compared to control. The reduction was very high in susceptible genotype with very less reduction in resistant genotype. No significant changes were observed in any activity in control plants of both genotypes at each time interval.

Keywords

Bakanae disease, inoculation, leaf gas exchange, stress, susceptible

Conclusion

The findings of the study reveals that the leaf gas exchange activities of plants is affected by disease severity. The genotypes varying in their response to the disease infection show different changes in their physiological parameters when challenged with the pathogens. The photosynthesis rate or net carbon assimilation rate generally tends to decrease in the infected plants because of many reasons associated with it. But in resistant genotypes as there is no or very less disease, these factors do not affect that much and not much significant change is observed. Similarly, the other activities like transpiration rate, water use efficiency, internal CO2, stomatal conductance etc are also affected differently by pathogen infection in different genotypes according to their susceptibility towards the pathogen.

References

-

How to cite this article

Jagdish Yadav, Ashok Kumar Mahawer, Amit Kumar Kesharwani, Prashantha S.T. and Oinam Washington Singh (2023). Evaluating the Impact of Bakanae Disease on Leaf Gas Exchange Physiology of Rice in Resistant and Susceptible Genotypes. Biological Forum – An International Journal, 15(2): 823-829.