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A New Short Growth-Duration Rice Cultivar, "Keumo 3"  

Kang, Jong-Rae (Department of Functional Crop, NICS, RDA)
Lee, Jong-Hee (Department of Functional Crop, NICS, RDA)
Kwack, Do-Yeon (National Institute of Crop Science(NICS), RDA)
Lee, Jeom-Sik (National Institute of Crop Science(NICS), RDA)
Park, No-Bong (Department of Functional Crop, NICS, RDA)
Ha, Woon-Gu (International Technology Cooperation Division, TCB, RDA)
Park, Dong-Soo (Department of Functional Crop, NICS, RDA)
Yeo, Un-Sang (Department of Functional Crop, NICS, RDA)
Lim, Sang-Jong (Rural Resources Development Institute, NAAS, RDA)
Oh, Byeong-Geun (Department of Functional Crop, NICS, RDA)
Publication Information
Korean Journal of Breeding Science / v.41, no.3, 2009 , pp. 292-298 More about this Journal
Abstract
A new rice cultivar "Keumo 3" was developed for adopting under double cropping system with after or before cash crop cultivation. It was selected from the cross-combination between YR17202 $F_2$/Shinkeumobyeo//YR15727-B-B-B-102. The parent, YR17202 $F_2$ individual plant, was used for tolerance to lodging, it derived from a cross between Nonganbyeo/Shinkeumobyeo. Nonganbyeo is well known to lodging tolerance cultivar, as well as biotic stress, because it was developed by crossing with Tongil type. And the YR15727-B-B-B-102 line used as another parent with short growth duration, likewise highly resistance to rice blast disease. The pedigree derived from the cross-combination YR17202 $F_2$/Shinkeumobyeo//YR15727-B-B-B-102 were generated to $F_7$, and a best line among them named as Milyang 201. After a series of yield trials, including local adaptability test conducted throughout the peninsular of Korea, Milyang 201 was registered with the name of "Keumo 3" in 2005. The cultivar belongs to a early maturing group and heads 4 days earlier than Keumobyeo, a standard cultivar. It has short culm, and less spikelet number per panicle than Keumobyeo. However, its milled rice yield grown under extremely late transplanting time, 10. July, over the 3 local sites for 2003-2005 years, averaged 4,48 MT/ha, which is 6% higher than the standard, Keumobyeo. "Keumo 3" has showed a durable resistance to leaf blast disease during fourteen blast nurseries screening covered from south to north in Korea for 2003-2007 years. And it was confirmed harbours pi-zt, a durable blast resistance gene. Moreover it was incompatible with 19 blast isolates under artificial inoculation, except one isolate, K1101. Additionally, "Keumo 3" exhibits resistance to $K_1$, $K_2$ and $K_3$ of bacterial blight pathogen, as well as strip virus disease resistance, and moderate resistance to dwarf virus disease. Consequently, the new rice cultivar "Keumo 3" would be well adopted where a bio stress makes a big problem annually.
Keywords
Rice; Cultivar; Keumo 3; Short growth-duration; blast;
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