Summary
Knowledge of population dynamics of the blast pathogen over space and time in interaction with rice cultivars under diverse environments is essential for the strategic and effective use of genetic resistance. Spatial and temporal stability of genetic resistance to rice blast is closely associated with the stability of blast population in an agroecoystem. Recent progress in molecular techniques has accelerated the development of rice cultivars with various blast resistance gene combinations. The major challenge to researchers is the selection of appropriate resistance genes and the prediction of spatial and temporal stability in rice cultivars with such gene combinations under different ecosystems. The conventional evaluation scheme has mainly focused on the static and short-term interaction of test entries with existing sets of major race groups, phylogenic groups (lineages), or natural inoculum present in selected test sites. A multisite evaluation of the International Rice Blast Nursery (IRBN) has been an effective means to determine the stability of genetic resistance over a wide range of geographical locations. The conventional varietal evaluation scheme is based on the assumption that stability of resistance over existing diverse blast groups is highly correlated with temporal stability in a given rice cultivar. However, no close correlation between stability over space and stability over time was observed in nondurable rice cultivars. Most known durably resistant rice cultivars exhibited stability both over time and space. Thus, stability over space may not be a sufficient evaluation parameter for durably resistant rice cultivars. To evaluate the temporal stability of partial resistance, the sequential evaluation scheme was developed. Using this field technique for a biological endurance test, two types of pathogenic variations were observed −1) development of new pathogenic races within a lineage and 2) gradual change in aggressiveness within a, race-lineage combination. In the future, emphasis should be given to the study of blast population dynamics (genetic as well as pathogenic) over space and time in close association with rice genotypes. Knowledge on this dynamic interaction may provide insights into the nature of genetic durability of host resistance and efficient and effective ways to use host resistance over space and time.
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Ahn, SW. (2000). Spatial and Temporal Stability of Genetic Resistance to Rice Blast. In: Tharreau, D., Lebrun, M.H., Talbot, N.J., Notteghem, J.L. (eds) Advances in Rice Blast Research. Developments in Plant Pathology, vol 15. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9430-1_19
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DOI: https://doi.org/10.1007/978-94-015-9430-1_19
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