What are the differences in yield formation among two cucumber (Cucumis sativus L.) cultivars and their F1 hybrid?
2020
Wang, Xiu-Juan | Kang, Meng-Zhen | Fan, Xing-Rong | Yang, Li-Li | Zhang, Bao-Gui | Huang, San-Wen | de Reffye, Philippe | Wang, Fei-Yue | Institute of Automation - Chinese Academy of Sciences | Qingdao Academy of Intelligent Industries (QAII) ; Chinese Academy of Sciences [Beijing] (CAS) | Chongqing Technology and Business University (CTBU) | China Agricultural University (CAU) | Agricultural Genomes Institute at Shenzhen ; Chinese Academy of Agricultural Sciences (CAAS) | Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [Occitanie])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | University of Chinese Academy of Sciences [Beijing] (UCAS) ; Chinese Academy of Sciences [Beijing] (CAS)
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Show more [+] Less [-]English. To elucidate the mechanisms underlying the differences in yield formation among two parents (P1 and P2) and their F1 hybrid of cucumber, biomass production and whole source–sink dynamics were analyzed using a functional–structural plant model (FSPM) that simulates both the number and size of individual organs. Observations of plant development and organ biomass were recorded throughout the growth periods of the plants. The GreenLab Model was used to analyze the differences in fruit setting, organ expansion, biomass production and biomass allocation. The source–sink parameters were estimated from the experimental measurements. Moreover, a particle swarm optimization algorithm (PSO) was applied to analyze whether the fruit setting is related to the source–sink ratio. The results showed that the internal source–sink ratio increased in the vegetative stage and reached a peak until the first fruit setting. The high yield of hybrid F1 is the compound result of both fruit setting and the internal source–sink ratio. The optimization results also revealed that the incremental changes in fruit weight result from the increases in sink strength and proportion of plant biomass allocation for fruits. The model-aided analysis revealed that heterosis is a result of a delicate compromise between fruit setting and fruit sink strength. The organ-level model may provide a computational approach to define the target of breeding by combination with a genetic model.
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