A two-line hybrid rice combination, Liangyoupeijiu, was used to estimate several factors of plant type, and environmental models for these factors at the heading stage were established using the data of eight ecologic...A two-line hybrid rice combination, Liangyoupeijiu, was used to estimate several factors of plant type, and environmental models for these factors at the heading stage were established using the data of eight ecological experimental sites in 2006 and 2007. According to climatic data from 1951 to 2005, the differences in those factors and their effects on plant canopy were analyzed for four rice cropping areas in China, including South China, the middle-lower reaches of the Yangtze River, Sichuan Basin, and river valley in Yunnan, China. The thickness of leaf layer （the distance from pulvinus of the third leaf from the top to the tip of flag leaf） and distribution of leaf area could be used as candidate indices for the plant type of a rice canopy.展开更多
Layered leaf area index （LAIk） is one of the major determinants for rice canopy. The objective of this study is to attain rice LAI k using morphological traits especially leaf traits that affected plant type. A theo...Layered leaf area index （LAIk） is one of the major determinants for rice canopy. The objective of this study is to attain rice LAI k using morphological traits especially leaf traits that affected plant type. A theoretical model based on rice geometrical structure was established to describe LAI k of rice with leaf length （Li）, width （Wi）, angle （Ai）, and space （Si）, and plant pole height （H） at booting and heading stages. In correlation with traditional manual measurement, the model was performed by high R2-values （0.95-0.89, n=24） for four rice hybrids （Liangyoupeijiu, Liangyou E32, Liangyou Y06, and Shanyou 63） with various plant types and four densities （3 750, 2 812, 1 875, and 1 125 plants per 100 m2） of a particular hybrid （Liangyoupeijiu）. The analysis of leaf length, width, angle, and space on LAI k for two hybrids （Liangyoupeijiu and Shanyou 63） showed that leaves length and space exhibited greater effects on the change of rice LAI k . The radiation intensity showed a significantly negative exponential relation to the accumulation of LAI k , which agreed to the coefficient of light extinction （K）. Our results suggest that plant type regulates radiation distribution through changing LAI k . The present model would be helpful to acquire leaf distribution and judge canopy structure of rice field by computer system after a simple and less-invasive measurement of leaf length, width, angle （by photo）, and space at field with non-dilapidation of plants.展开更多
在应用水稻株形设计系统(rice plant type design system,RPTDS)进行虚拟试验的基础上,结合在非自然群体中进行的田间试验以及穗重模型,分析了水稻叶片对穗重的贡献率。结果表明:剑叶、倒二叶对穗重的贡献率相同,均为15%,倒三叶,倒四、...在应用水稻株形设计系统(rice plant type design system,RPTDS)进行虚拟试验的基础上,结合在非自然群体中进行的田间试验以及穗重模型,分析了水稻叶片对穗重的贡献率。结果表明:剑叶、倒二叶对穗重的贡献率相同,均为15%,倒三叶,倒四、五叶对穗重的贡献率同为8%,但随着单位叶面积干物质积累量的增加,中下部叶片对穗重贡献率的提升幅度更大。因此,可通过重塑株形,使光能在群体中相对均匀分布,进而通过促进中下部叶片光合能力而提升产量水平。其中,倒三叶的形态、位置可能在株形设计中处于关键位置。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 30370830)
文摘A two-line hybrid rice combination, Liangyoupeijiu, was used to estimate several factors of plant type, and environmental models for these factors at the heading stage were established using the data of eight ecological experimental sites in 2006 and 2007. According to climatic data from 1951 to 2005, the differences in those factors and their effects on plant canopy were analyzed for four rice cropping areas in China, including South China, the middle-lower reaches of the Yangtze River, Sichuan Basin, and river valley in Yunnan, China. The thickness of leaf layer （the distance from pulvinus of the third leaf from the top to the tip of flag leaf） and distribution of leaf area could be used as candidate indices for the plant type of a rice canopy.
基金supported by the National Natural Science Foundation of China (NSFC,30871479)
文摘Layered leaf area index （LAIk） is one of the major determinants for rice canopy. The objective of this study is to attain rice LAI k using morphological traits especially leaf traits that affected plant type. A theoretical model based on rice geometrical structure was established to describe LAI k of rice with leaf length （Li）, width （Wi）, angle （Ai）, and space （Si）, and plant pole height （H） at booting and heading stages. In correlation with traditional manual measurement, the model was performed by high R2-values （0.95-0.89, n=24） for four rice hybrids （Liangyoupeijiu, Liangyou E32, Liangyou Y06, and Shanyou 63） with various plant types and four densities （3 750, 2 812, 1 875, and 1 125 plants per 100 m2） of a particular hybrid （Liangyoupeijiu）. The analysis of leaf length, width, angle, and space on LAI k for two hybrids （Liangyoupeijiu and Shanyou 63） showed that leaves length and space exhibited greater effects on the change of rice LAI k . The radiation intensity showed a significantly negative exponential relation to the accumulation of LAI k , which agreed to the coefficient of light extinction （K）. Our results suggest that plant type regulates radiation distribution through changing LAI k . The present model would be helpful to acquire leaf distribution and judge canopy structure of rice field by computer system after a simple and less-invasive measurement of leaf length, width, angle （by photo）, and space at field with non-dilapidation of plants.
文摘在应用水稻株形设计系统(rice plant type design system,RPTDS)进行虚拟试验的基础上,结合在非自然群体中进行的田间试验以及穗重模型,分析了水稻叶片对穗重的贡献率。结果表明:剑叶、倒二叶对穗重的贡献率相同,均为15%,倒三叶,倒四、五叶对穗重的贡献率同为8%,但随着单位叶面积干物质积累量的增加,中下部叶片对穗重贡献率的提升幅度更大。因此,可通过重塑株形,使光能在群体中相对均匀分布,进而通过促进中下部叶片光合能力而提升产量水平。其中,倒三叶的形态、位置可能在株形设计中处于关键位置。
