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《Chinese Journal of Rice Science》 2006-05
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Some Canopy Indices Influencing Sheath Blight Development in Hybrid Rice

ZHONG Xu-hua 1 , PENG Shao-bing 2 , Roland J. BURESH 2 , HUANG Nong-rong 1 , ZHENG Hai-bo 1 ( 1 Rice Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, 2 International Rice Research Institute, DAPO Box 7777, Manila, Philippines)  
The relationships between disease severity of sheath blight and several canopy indices of rice, i.e. stem number (TILPI) and chlorophyll content at panicle initiation (SPADPI), and stem number (TILHD), leaf area index (LAIHD) and chlorophyll content at heading (SPADHD) were investigated in the four-season field experiments conducted in Guangzhou, China during early and late seasons of 2004 and 2005. Yueza 122, a two-line hybrid rice, was arranged in a randomized complete block design with eight N-fertilizer treatments and four replications. There were two categories of factors, i.e. canopy conditions and climatic factors, which affected sheath blight development. Main canopy indices influencing disease severity were TILPI, SPADPI, TILHD, LAIHD, and SPADHD, which explained 44.8% of variation in disease severity among years, seasons and N treatments. Main climatic factors were daily mean temperature (Tav) and relative humidity (RH). The multiple regression equation with TILPI, SPADPI, LAIHD, SPADHD, Tav and RH as independent variables explained 82.7% of variation in disease severity. The disease severity decreased as light transmittance ratio of the canopy at heading (LTR) increased. The LTR, Tav and RH explained 80.2% of variation in disease severity. It is suggested that the reduced maximum tiller number, lower chlorophyll content of leaves, smaller LAI at heading and better ventilation of the rice canopy are the direction to establishing a healthy canopy with high grain yield potential and low sheath blight occurrence.
【Fund】: 国际水稻研究所(IRRI)合作项目;; 广东省科技专项资助项目(2005A20402001)。
【CateGory Index】: S435.111
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