Experiment-modelling-integration of fundamental physiological processes towards digital twin: light-response of photosynthesis as an example

Document Type

Article

Publication Date

2024

Journal Title

ISHS Acta Horticulturae

ISSN

ISSN: 0567-7572, eISSN: 2406-6168

Keywords

data integration, light relation, light response curve, leaf gas exchange, narrow orchard system, photoinhibition, plant models

Disciplines

Horticulture

Abstract

Horticulture industries worldwide face multi-dimensional challenges (e.g., climate change, soil degradation, increasing production costs and global population, etc.). Industry-oriented research and development innovations in the past decades have significantly helped fruit crop industries overcome these challenges, towards modern orchard production systems with enhanced resilience, productivity, profitability and sustainability. Key examples of these innovation efforts include new planting systems optimizing tree crop light relation, sensor technologies auto-monitoring real-time plant functions, data integration and model stimulation towards digital decision tools to support growers identify yield-related issues at early stages, digital twin of perennial orchard production systems (e.g., apple, mango, grapevine) via integrating biological, physical and digital properties and processes – across leaf, canopy, whole-tree and stand levels – to simulate the consequences of changed environment and/or management practices on production systems. However, partly due to the complexity of bridging cross-disciplinary knowledge advancement, there could be fundamental physiological processes which have been experimentally observed for decades but still not been well reproduced by models. Using the light-response of photosynthesis as an example, this paper reviewed recent experiment-modelling-integration efforts towards the accurate model representation. This paper reviewed the performances of two models – the most widely used non-rectangular hyperbolic model (NH model) and a more recently developed mechanistic and nonasymptotic model (Ye model) which has been gaining increasing attention NDASH in fitting light response of 1) photosynthesis, 2) electron transport rate (and its allocation for ribulose bisphosphate carboxylation and oxygenation), and 3) stomatal conductance and water use efficiency, across light-limited (particularly 0-50 μmol m‑2 s‑1), light-saturated and photoinhibitory light intensity levels. The accuracy of Ye model and its consistency of model framework in reproducing these concurrent photosynthetic functions under the changing light environment, make it ready to be adopted by the current and future digital twin efforts on two-dimensional multileader narrow orchard systems.

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Digital Object Identifier (DOI)

https://doi.org/10.17660/ActaHortic.2024.1395.18