Canopy photosynthesis,rather than leaf photosynthesis,is highly related to plant biomass and yield formation.Studying canopy photosynthesis and identifying the parameters that control it can help optimize agricultural...Canopy photosynthesis,rather than leaf photosynthesis,is highly related to plant biomass and yield formation.Studying canopy photosynthesis and identifying the parameters that control it can help optimize agricultural management and achieve crop yield potential.Compared with traditional parameters,canopy occupation volume(COV)offers an integrative parameter on canopy architecture related to canopy photosynthetic rates.In this study,we developed a high-throughput method to derive COV for different rice varieties.We first used multi-perspective two-dimensional imaging to reconstruct three-dimensional point clouds of rice plants and developed a suite of pipelines to calculate plant height,leaf number,tiller number,and biomass,with R^(2) values of 91.8%,95.9%,82.3%,and 94.3%,respectively.We further employed point cloud data to reconstruct the surfaces of rice plants and construct a virtual canopy model of the rice population.Light distribution was simulated using a ray-tracing algorithm and canopy photosynthetic rates were simulated via photosynthetic rate-incident light intensity curve fitting.Furthermore,we systematically explored the relationships between canopy phenotypes and photosynthetic rates,and found that COV was the most effective predictor of canopy photosynthesis,achieving an R^(2) value of 92.1%.Adjustment in atmospheric transmittance showed that COV strongly correlated with canopy photosynthesis under different light conditions,with higher accuracy observed under diffuse light.Variations in planting density confirmed that this correlation remained strong at the community level.In summary,this study demonstrates that COV is closely linked to simulated canopy photosynthesis and the developed pipeline can support future agronomic and breeding research.展开更多
乙型肝炎病毒(hepatitis B virus,HBV)感染是肝细胞癌(hepatocellular carcinoma,HCC)发生的主要危险因素,但HBV是非细胞毒性病毒,本身不会引起肝细胞损伤。HBV感染时的肝脏损伤主要由机体的抗HBV免疫应答引起,因此免疫应答相关的病理...乙型肝炎病毒(hepatitis B virus,HBV)感染是肝细胞癌(hepatocellular carcinoma,HCC)发生的主要危险因素,但HBV是非细胞毒性病毒,本身不会引起肝细胞损伤。HBV感染时的肝脏损伤主要由机体的抗HBV免疫应答引起,因此免疫应答相关的病理机制对HBV相关性HCC的发生至关重要,HBV驱动HCC的机制也成为目前研究的热点之一。大量研究显示,慢性HBV持续感染可导致先天性和适应性免疫反应功能障碍。本文就HBV感染导致的HCC特异性先天性免疫和适应性免疫反应研究进展作一综述。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.32201654 and U22A20464)National Key Research and Development Program from the Ministry of Science and Technology of China(Grant No.2020YFA0907600)the 2115 Talent Development Program of China Agricultural University.
文摘Canopy photosynthesis,rather than leaf photosynthesis,is highly related to plant biomass and yield formation.Studying canopy photosynthesis and identifying the parameters that control it can help optimize agricultural management and achieve crop yield potential.Compared with traditional parameters,canopy occupation volume(COV)offers an integrative parameter on canopy architecture related to canopy photosynthetic rates.In this study,we developed a high-throughput method to derive COV for different rice varieties.We first used multi-perspective two-dimensional imaging to reconstruct three-dimensional point clouds of rice plants and developed a suite of pipelines to calculate plant height,leaf number,tiller number,and biomass,with R^(2) values of 91.8%,95.9%,82.3%,and 94.3%,respectively.We further employed point cloud data to reconstruct the surfaces of rice plants and construct a virtual canopy model of the rice population.Light distribution was simulated using a ray-tracing algorithm and canopy photosynthetic rates were simulated via photosynthetic rate-incident light intensity curve fitting.Furthermore,we systematically explored the relationships between canopy phenotypes and photosynthetic rates,and found that COV was the most effective predictor of canopy photosynthesis,achieving an R^(2) value of 92.1%.Adjustment in atmospheric transmittance showed that COV strongly correlated with canopy photosynthesis under different light conditions,with higher accuracy observed under diffuse light.Variations in planting density confirmed that this correlation remained strong at the community level.In summary,this study demonstrates that COV is closely linked to simulated canopy photosynthesis and the developed pipeline can support future agronomic and breeding research.
文摘乙型肝炎病毒(hepatitis B virus,HBV)感染是肝细胞癌(hepatocellular carcinoma,HCC)发生的主要危险因素,但HBV是非细胞毒性病毒,本身不会引起肝细胞损伤。HBV感染时的肝脏损伤主要由机体的抗HBV免疫应答引起,因此免疫应答相关的病理机制对HBV相关性HCC的发生至关重要,HBV驱动HCC的机制也成为目前研究的热点之一。大量研究显示,慢性HBV持续感染可导致先天性和适应性免疫反应功能障碍。本文就HBV感染导致的HCC特异性先天性免疫和适应性免疫反应研究进展作一综述。
