Liu Xiang, Gu Shenghao, Wen Weiliang, Lu Xianju, Jin Yu, Zhang Yongjiang, Guo Xinyu
State Key Laboratory of North China Crop Improvement and Regulation, Key Laboratory of Crop Growth Regulation of Hebei Province, College of Agronomy, Hebei Agricultural University, Baoding 071000, China.
Beijing Key Lab of Digital Plant, National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China.
Plants (Basel). 2023 Mar 8;12(6):1229. doi: 10.3390/plants12061229.
Maize ( L.) benefits from heterosis in-yield formation and photosynthetic efficiency through optimizing canopy structure and improving leaf photosynthesis. However, the role of canopy structure and photosynthetic capacity in determining heterosis in biomass production and radiation use efficiency has not been separately clarified. We developed a quantitative framework based on a phytomer-based three-dimensional canopy photosynthesis model and simulated light capture and canopy photosynthetic production in scenarios with and without heterosis in either canopy structure or leaf photosynthetic capacity. The accumulated above-ground biomass of Jingnongke728 was 39% and 31% higher than its male parent, Jing2416, and female parent, JingMC01, while accumulated photosynthetically active radiation was 23% and 14% higher, correspondingly, leading to an increase of 13% and 17% in radiation use efficiency. The increasing post-silking radiation use efficiency was mainly attributed to leaf photosynthetic improvement, while the dominant contributing factor differs for male and female parents for heterosis in post-silking yield formation. This quantitative framework illustrates the potential to identify the key traits related to yield and radiation use efficiency and helps breeders to make selections for higher yield and photosynthetic efficiency.
玉米（L.）通过优化冠层结构和改善叶片光合作用，在产量形成和光合效率方面受益于杂种优势。然而，冠层结构和光合能力在决定生物量生产杂种优势和辐射利用效率方面的作用尚未得到明确区分。我们基于基于叶元的三维冠层光合作用模型开发了一个定量框架，并在冠层结构或叶片光合能力存在或不存在杂种优势的情况下，模拟了光捕获和冠层光合生产。京农科728的地上部生物量积累分别比其雄性亲本京2416和雌性亲本京MC01高39%和31%，而光合有效辐射积累相应地高23%和14%，导致辐射利用效率提高13%和17%。吐丝后辐射利用效率的提高主要归因于叶片光合能力的改善，而吐丝后产量形成杂种优势的主导贡献因素在雄性和雌性亲本中有所不同。这个定量框架说明了识别与产量和辐射利用效率相关的关键性状的潜力，并有助于育种者选择更高的产量和光合效率。
