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HPPD 저해 제초제들에 대한 통일형벼 품종의 약해 반응
김상열 ( Sang Yeol Kim ),한상익 ( Sang Ik Han ),이지윤 ( Ji Yoon Lee ),조준현 ( Jun Hyeon Cho ),오성환 ( Seong Hwan Oh ),박노봉 ( No Bong Park ),손영보 ( Yeong Bo Son ),송유천 ( You Chun Song ),남민희 ( Min Hee Nam ) 한국국제농업개발학회 2014 韓國國際農業開發學會誌 Vol.26 No.3
This study was conducted to investigate the levels of phytotoxicity of Japonica×Indica-type rice varieties to HPPD(4-hydroxy phenylpyruvate dioxygenase)-inhibiting herbicides known for their efficiency to control the sulfonylurea-resistant weeds. The plant injury and rice yield of three Indica × Japonica rice (long grain, cv. Hanareumbyeo, Hanareum2, Dasanbyeo) were evaluated by application rate of HPPD-inhibiting herbicdes, benzobicyclon and mesotrione+pretilachlor (MP), and butachlor as control in transplanting rice in 2012 -2013 in Miryang. The herbicide rates of 350 g, 140 g a.i. ha-1 for recommended rate(1x) and 750 g, 280 g a.i. ha-1 for 2x with benzobicyclon andmesotrione+ pretilachlor (MP), respectively, were applied as pre-emergence treatments while only the 1x concentration of 1,500 g a.i. ha-1 was used for butachlor. All three Indica × Japonica rice cultivars were extremely sensitive to both benzobicyclon and MP herbicides even at the 1x rate as reflected by high visual injury of leaf chlorosis and the injury was more severe at 2x rate than 1x concentration. The percentage of foliar chlorosis of Indica × Japonica rices at the 1x rate was only 34 ~ 64% for benzobicyclon at 14 days after treatment(DAT) and 63 ~ 75% for MP at 7 DAT but the injury was more severe at the 2x rate with 76 ~ 83% for benzobicyclon and 83 ~ 89%. However, the leaf chlorosis injury of the three rice varieties recovered at 1x rate of benzobicyclon and MP about 30 DAT but rice plant death of 6.5 ~ 11.5% for benzobicyclon and 2.1 ~ 3.3% for the MP was observed at the 2x rate, respectively. The heading date of the injured rice plant was delayed by 1 to 2 days and panicle number per square meter, ripened grain ratio and 1000-brown rice weight were decreased due to the injury of rice plant by the herbicide treatments as compared with the control treatment of butachlor. Yield of the Indica × Japonica rice varieties treated with benzobicyclon and MP was significantly reduced by 5 ~ 9% even at 1x rate and 14 ~ 28% at 2x rate, respectively. The result indicates that MP and benzobicyclon should not be used for weed control in Indica × Japonica varieties and rice plant should be transplanted again to some extent at 2x rate of the benzobicyclon and MP herbicides.
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