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Canopy photosynthesis modeling and phenotyping to guide crop breeding

Qingfeng Song  
【摘要】:Canopy photosynthesis,which is the sum of all leaves' photosynthesis in a field,is a determinator of final yield production as it provides the carbon and energy necessary for plant growth and seeds.However,the development of canopy photosynthesis research is stagnant due to the difficulty to measure it in field.Optimizing canopy photosynthesis is even harder as its susceptibility to many factors,such as plant architecture,micro-climate in the canopy and photosynthetic features of all leaves.To tackle these problems,we developed a new canopy photosynthesis and transpiration system(CAPTS),which can automatically measure gas exchange of plant canopy,for phenotyping canopy photosynthesis and a integrated 3 D canopy model,which incorporated a comprehensive three-dimensional(3 D) representation of canopy architecture,a ray tracing algorithm and a mechanistic dynamic model of leaf photosynthesis,for optimizing canopy photosynthesis.First,the CAPTS measurement correlated with the calculated canopy photosynthesis using the model,which was detailed parameterized and we showed the previous models using averaged light in each layer of canopy may over estimate canopy photosynthesis up to 25%.Secondly,we theoretically studied the impacts of different plant structures,locations and planting strategies to canopy photosynthesis with validations using CAPTS.Thirdly,we dissected the contributions of environmental and physiological factors to the increasement of canopy photosynthesis under future global change senario,which can hardly be assessed by experiments.Finally,we systematically studied the impact of chlorophyll content in leaves with our model and predicted that proper decrease of leaf chlorophyll content can increase canopy photosynthesis rate and nitrogen use efficiency.This was also confirmed with transgenic experiment.In conclusion,we developed a new equipment for measuring canopy photosynthesis and a new 3 D model for studying canopy photosynthesis theoretically.With the two methods combined,we provided a new platform to optimize canopy photosynthesis for higher crop yield and resource use efficiency.

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