벼 중생 흰잎마름병 저항성 신품종 “강백”

A New Medium-Maturing, “Gangbaek” with Resistance to Bacterial Blight

‘Gangbaek’ is a japonica rice variety developed and registered by the rice breeding team of Department of Rice and Winter Cereal Crop, NICS, RDA in 2006. ‘Gangbaek’ was derived from a cross between ‘Suweon345’ with good grain quality and ‘DV85’ resistant to bacterial blight, K3a. F 1 plants were grown in the greenhouse in winter of 1992/1993 and backcrossed with ‘Suweon345’ as the recurrent parent. Plants resistant to K 3a race of bacterial blight (BB) were selected from BC 1 F 1 to BC 4 F 1 and used as parents in the backcrossing processes. This variety has about 120 days growth duration from transplanting to harvesting in west-southern coast and Honam plain of Korea. It is about 69 cm in culm length and tolerance to lodging. In reaction to biotic and abiotic stresses, it shows moderately resistance to blast, and resistance to bacterial blight pathogen, K 1 , K 2 , K 3 and K 3a , but susceptible to other major diseases and insect pests. The milled rice of ‘Gangbaek’ exhibits translucent, relatively clear non-glutinous endosperm and midium short grain. It has lower amylose content of 18.6% and protein content of 6.4% compared with ‘Nampyeongbyeo’. The milled rice yield performance of this variety is about 5.28 MT/ha in local adaptability test for three years. This cultivar would be adaptable to the bacterial blight-prone area in the south-western coastal and Honam plain of Korea.