A Research For Plant Type Quantitative Design Of High-yield Crop Based On Light Model

Nowadays, breeding for super-high-yield has become a hot research topic. As plant architecture is the skeleton of super-high-yield, ideotype of high-yield crop has attracted much attention. In plant type research, researchers often used experiment based approaches which could provide beneficial reference and direction for breeding, but this method needed time-consuming and tedious work, so it could not provide a quick, targeted and quantified method for plant type breeding. Combined with the virtual plant, traditional agricultural activities were simulated to quantitatively control plant individual, environment, etc. The effect of traditional agricultural activities can be quickly obtained, but the efficiency of this method is still low limited by the ability of artificial operation. Therefore, researchers has paid highly attention on how to further reduce manual intervention in type design of crop plant to automatically and quickly obtain high-yield plant type.In this paper, an optimization algorithm was applied to the optimization of virtual plant type based on functional-structural model. As a result, high-yield plant type was automatically and quickly obtained. The work and contributions of this paper are shown as follows:1. The light environment model of sky was established. Firstly, the position of the sun changed over time, and the solar radiation changed along with the position of sun. And then the proportion of direct radiation and scattering radiation in sky was established. Finally, a3D visualization model, which simulated the direct radiation from the sun and the scattering radiation from the sky, was built to change the light radiation of light environment model over time.2. Rice functional-structural model was established. First of all, the morphological structure model of the rice was built. The canopy light distribution of a rice plant was obtained. Then, the effect of the production and distribution of canopy photosynthetic product to the growth of each organ was calculated. The influence of organs reconstruction to morphological structures of plant was studied. A rice functional-structural model was set up4o implement the simulation of rice growth process, according to the feedback of the canopy biomass production, biomass allocation and growth of organs.3. A method based on genetic algorithm to optimize rice plant type was proposed. First of all, rice plant type optimization model was established. Based on genetic algorithm, a new method to optimize the type of rice plant was introduced, which took rice plant type as input parameters of the rice functional-structural model to obtain its corresponding output as fitness. Strategy of double-counting avoidance was also designed. Finally, rice plant type which can increase yield was automatically obtained.4. A digital design system of rice morphological structure was developed by using C++programming language, graphics rendering engine of OpenGL and MFC framework.In this study, a method based on genetic algorithm to optimize rice plant type took a new train of thought in the quantification of plant type design. It also provided an effective information technology support for improving crop spatial structure, yield and quality. Theoretical ideotype with improved yield was automatically obtained. In breeding new plant type for high yield, specific germplasm resources provided a reference for researchers to shorten the breeding time and to improve the breeding efficiency. Therefore, this study has an important significance and practical value.