Sequential Planting as a Method of Screening of Durable Resistance to Rice Blast in Korea

  • Jae-Hwan Roh
  • Byung-Ryun Kim
  • Se-Weon Lee
  • Young-Chan Cho
  • Dong-Soo Ra
  • In-Seok Oh
  • Seong-Sook Han
Conference paper

Abstract

A sequential planting method was developed to identify durable blast resistance of rice cultivars against a mixture of 26 rice blast isolates. Daesanbyeo and Gihobyeo which, initially showed high resistance in farmer’s field followed by rapid breakdown of resistance in a short period, exhibited low disease until the third and fourth plantings but later showed higher than 40% diseased leaf area (DLA). In contrast, Palgongbyeo and Seomjinbyeo with low disease occurrence and sustainable field resistance during the last 20 years in the farmers’ field, showed less than 20% DLA until the seventh planting. Results from the sequential planting method in the greenhouse were significantly similar to the farmers’ field data, suggesting that the method is effective to evaluate durability of rice blast resistance. Durability of 22 rice cultivars/lines was also examined. Monogenic rice lines, IRBL5-M(Pi5(t)) and IRBL3-CP4(Pi3(t)) exhibited durable resistance to Korean rice blast isolates below 40% DLA during the sequential planting times. Interestingly, susceptible symptoms emerged from IRBL9-W(Pi9(t)), known to be associated with broad-spectrum resistance, since the third planting time, and disease severity of IRBL9-W extremely increased from the fourth planting time. Suwon474, Suwon476, and Gyehwa22 were identified as durable resistant cultivars to Korean blast isolates by the sequential planting method. This work will be applied to establish the new Korean differential system for blast resistance breeding program.

Keywords

Durable resistance Rice blast Sequential planting 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Jae-Hwan Roh
  • Byung-Ryun Kim
  • Se-Weon Lee
  • Young-Chan Cho
  • Dong-Soo Ra
  • In-Seok Oh
  • Seong-Sook Han
    • 1
  1. 1.Plant Pathology Division, National Institute of Agricultural Science and Technology, RDAKorea

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