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Modeling canopy photosynthesis and light interception partitioning among shoots in bi-axis and single-axis apple trees (Malus domestica Borkh.)

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Key message

Bi-axis training increased vegetative shoot light interception and modeled photosynthetic rate, and reduced fruiting shoot mutual shading and vegetative growth by optimizing canopy structure compared to single-axis in young apple trees.

Abstract

Improving light interception and distribution within canopy are constant objectives of training through manipulating tree architecture. A bi-axis training system with two primary scaffolds has been proposed to improve flowering and dry matter production in apple trees. In this study, ‘Fuji’ apple trees trained using a bi-axis or single-axis training system were compared. Twelve three-dimensional (3D) virtual apple trees were reconstructed by combining 3D digitizing and allometric relationships for three shoot types (vegetative long shoot, VL; fruiting shoot, FS; vegetative short shoot, VS), to evaluate canopy structure impacts on light interception. Light interception efficiency was evaluated by silhouette to total area ratio (STAR). The potential canopy photosynthetic rate was evaluated by the eco-physiological RATP model. The leaf area of VL in bi-axis trained trees was approximately 40% lower than that in single-axis trees. Lower leaf area and more uniform spatial distribution were noted in VL in bi-axis than in single-axis trees. This led to more even spatial light distribution and more shoots having higher STAR in bi-axis than in single-axis trees, regardless of the whole tree or shoot type. In the virtual orchard, bi-axis trees had a 25% and 10% STAR increase in VS and VL, respectively, but a similar STAR for FS compared to single-axis trees. Mutual shading between neighboring trees in the virtual orchard made of bi-axis trees was significantly lower than that with single-axis trees for FS. The modeled canopy net photosynthetic rate was 26% higher in bi-axis than in single-axis trees. With the increase in tree age, the projected leaf area increased, but the porosity of the canopy decreased, and mutual shading increased for the whole canopy and all shoot types, irrespective of training systems. These results indicated that manipulating scaffolds in apple trees can regulate canopy structure, light interception, and vegetative growth during the early developmental stages.

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Data availability

All reconstructed 3D tree files are available from the first author on reasonable request.

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Acknowledgements

This research was funded by the National Natural Science Foundation of China (31860527), Shaanxi province Key Research and Development Program (2017ZDXM-NY-511019, 2016KTZDNY01-04), The China Apple Research System (CARS-27) and National Key R&D Program Projects (2018YFD1000200). Wei-wei Yang thank Chinese Scholarship Council (CSC) for supporting his study in INRA, France. We thank the two anonymous reviewers for useful appraisal of the manuscript.

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Conceptualization: MH, DZ and WY. Material preparation and data collection were performed by XM, DM, SH and JS. Data analysis were performed by WY and XM. The first draft of the manuscript was written by WY and EC and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Dong Zhang.

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Mingyu Han: Deceased on 2nd August 2018.

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Yang, W., Ma, X., Ma, D. et al. Modeling canopy photosynthesis and light interception partitioning among shoots in bi-axis and single-axis apple trees (Malus domestica Borkh.). Trees 35, 845–861 (2021). https://doi.org/10.1007/s00468-021-02085-z

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