Development of Near-Isogenic Lines (NILs) Conferring Xa4, xa5 and Xa21 Genes Resistant to Bacterial Blight (Xanthomonas oryzae pv. oryzae) in japonica rice Genetic Background

  • Kim, Ki-Young (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Shin, Mun-Sik (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Kim, Woo-Jae (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Park, Hyun-Su (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Ko, Jong-Cheol (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Nam, Jeong-Kwon (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Shin, Woon-Chul (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Mo, Young-Jun (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Jeung, Ji-Ung (Rice Research Division, National Institute of Crop Science, RDA) ;
  • Kim, Bo-Kyeong (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Ko, Jae-Kwon (Department of Rice and Winter Cereal Crop, NICS, RDA)
  • Received : 2011.10.02
  • Accepted : 2011.12.16
  • Published : 2011.12.30

Abstract

Near-isogenic lines (NILs) carrying bacterial blight resistance genes (Xa4, xa5 and Xa21) were developed in japonica rice using Suweon345 as genetic background. NILs were selected by gene specific DNA markers and inoculation of K1 or K3a race. NILs conferring Xa4 were resistant to K1, K2, K3, and moderately resistant to K3a. NILs conferring xa5 were resistant to K1, K2, K3, and K3a. NILs having Xa21 were susceptible to K1, while resistant to K2, K3 and K3a. Target genes of NILs with the genetic background of Suweon345 were also confirmed by using eleven Philippines races and International Rice Bacterial Blight (IRBB) NILs carrying Xa4, xa5 and Xa21. All NILs had no significant difference from their recurrent parents in the major agronomic traits except for panicle length and brown rice 1,000 grain weight. Heading date of NILs ranged from Aug. 10 to Aug. 11, which was similar to that of recurrent parent, Suweon345. Culm length, number of grains per panicle and ratio of ripened grain of NILs were similar to those of Suweon345. Milled rice of NILs was ranged from 4.82 to 4.93MT/ha. These NILs will be useful for improving resistance to K3a race of bacterial blight pathogens in Korean japonica cultivars.

Keywords

References

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