흰잎마름병 K3a균계 저항성 신품종 "신백"

Bacterial blight (BB) disease is one of the most serious rice diseases in Korea. xa5 showing a wider spectrum resistance to Korean BB isolates is one of the most important bacterial blight resistance genes in rice breeding in Korea. A new rice cultivar ``Shinbaek`` carrying xa5 gene was developed at the rice breeding team of the Department of Functional Crop, NICS, RDA in 2010. ``Shinbaek`` was derived from the cross between ``Iksan469 and ``HR23966-22-1-2`` carrying xa5 gene which was originated from indica rice ``IRBB5``. ``Shinbaek`` is resistance to a major Korean BB isolate such as K1, K2, K3 and K3a, and it is also resistance tor ice stripe virus disease (RSV). Heading date of ``Shinbaek`` is August 11 as mid maturing ecotype. The major agronomic characteristics of ``Shinbaek`` is good plant type with short culm length, longer panicle length, higher number of spikelet per panicle as compared to those of ``Nampyeongbyeo``, However, the number of tiller and grain filling ratio were lower compared to that of ``Nampyeongbyeo``. The grain appearance, amylose content, and protein content were similar with those of ``Nampyeongbyeo``. However the palatability of cooked rice and milling recovery were still lower than those of ``Nampyeongbyeo``. The milled rice yield of ``Shinbaek`` is 5.75 MT per ha, 5.49 MT per ha and 4.68 MT per ha at the ordinary transplanting, double-crop system, and late transplanting of the local adaptability test, respectively. Thus, ``Shinbaek`` would be a suitable cultivar to the mid and southern plain area, especially in BB disease prone area and it is a useful source to enhance the BB resistant breeding program.