Evaluation of Rice Blast Incidence and Identification of Resistant sources in Aromatic Rice Landraces

Author: U. Keerthana, A.K. Senapati, Manas K. Bag, S.R. Prabhukarthikeyan, Niranjan Das and Mihira K. Mishra

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Abstract

The Rice blast disease, primarily caused by the fungal pathogen Magnaporthe oryzae, represents a significant biotic stress factor affecting rice production in India. To identify sources of resistance to leaf blast disease within aromatic rice landraces, evaluations were conducted under both natural and induced epiphytotic conditions during the wet seasons of 2021 and 2022. A comprehensive screening encompassed 108 aromatic rice landraces, including susceptible controls (CO 39 and HR 12), cultivated within a standardized blast nursery. Disease severity pertaining to rice leaf blast was assessed utilizing a 0-9 scale. Of the rice genotypes screened, 17 were classified as resistant, 17 landraces demonstrated moderate resistance, and 74 genotypes proved susceptible to rice leaf blast disease. The identification of these resistant accessions, possessing requisite agronomic traits, suggests their potential utilization as donor parents within leaf blast resistance breeding programs aimed at developing resistant aromatic rice varieties.

Keywords

Rice blast, aromatic landraces, Percent disease index, screening, resistance

Conclusion

The threat posed by rice blast disease to aromatic rice landraces is multifaceted, impacting their genetic diversity, cultural significance, and economic value. The challenge of managing this disease in aromatic landraces is compounded by their susceptibility and the imperative to preserve desirable traits. Furthermore, rice blast undermines conservation efforts aimed at safeguarding the genetic diversity of these valuable rice varieties. Identifying and incorporating blast-resistant donors into aromatic rice genotypes is essential to mitigate these risks. Our study contributes to this effort by identifying resistant donors through screening analysis. These identified genotypes can be used as potential donors for developing the resistant lines.

References

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How to cite this article

U. Keerthana, A.K. Senapati, Manas K. Bag, S.R. Prabhukarthikeyan, Niranjan Das and Mihira K. Mishra (2023). Evaluation of Rice Blast Incidence and Identification of Resistant sources in Aromatic Rice Landraces. Biological Forum – An International Journal, 15(1): 755-760.