Abstract
Sunburn in grapevine berries is known as a recurring disorder causing severe yield losses and a decline in berry quality. The transition from healthy to sunburnt along a temporal trajectory is not fully understood. It is driven by light-boosted local heat impact and modulated by, e.g., past environments of the berry and its developmental state. Events of berry sunburn are often associated with heatwaves, indicating a link to climate change. In addition, the sensitivity of grapevine architecture to changing environmental condition indicates an urgent need to investigate and adapt mitigation strategies of berry sunburn in future vineyards. In this perspective, we want to identify missing links in predicting berry sunburn in vineyards and propose a modeling framework that may help us to investigate berry sunburn in future vineyards. For this, we propose to address open issues in both developing a model of berry sunburn and considering dynamic canopy growth, and canopy interaction with the environment and plant management such as shoot positioning or leaf removal. Because local environmental conditions drive sunburn, we aim at showing that identifying sunburn-reducing strategies in a vineyard under future environmental conditions can be supported by a modeling approach that integrates effects of management practices over time and takes grapevine architecture explicitly into account. We argue that functional-structural plant models may address such complex tasks. Once open issues are solved, they might be a promising tool to advance our knowledge on reducing risks of berry sunburn in silico.
Highlights
Berry sunburn in grapevines is a recurring disorder that can reduce berry quality and cause severe yield loss (Keller, 2015)
Following Gambetta et al (2021), a model of berry sunburn of grapevine may assume that sunburn occurrence can be predicted from the following key characteristics of the berry: susceptibility of the given cultivar to sunburn, developmental stage, and duration of adaptation and berry surface temperature
For modeling sunburn in vineyards, model approaches are needed that echo canopy architecture and its interplay with the incoming light in high resolution
Summary
Berry sunburn in grapevines is a recurring disorder that can reduce berry quality and cause severe yield loss (Keller, 2015). Again, elevated CO2 (eCO2), one driver of climate change, may change bunch architecture (i.e., longer bunches), which might affect sun exposure, and increase growth of secondary lateral shoots, but periods of high temperatures may weaken this effect (Wohlfahrt et al, 2018) Both statements neglect effects of adapted management practices (Stoll et al, 2010; Zheng et al, 2017; Gatti et al, 2018; Valentini et al, 2018, 2021; Bei et al, 2019; Lavado et al, 2019; Hunter et al, 2020; Gutiérrez-Gamboa et al, 2021; Martinez De Toda, 2021; Naulleau et al, 2021; Schäfer et al, 2021) and other limiting factors like reduced soil water availability (Lopes et al, 2018). Other factors effecting canopy development and light penetration, such as nutrition and water status (Keller, 2005; Lopes et al, 2018; Briglia et al, 2020), are assumed to be unaltered and linked to a selected reference condition, this limits the initial scope of the modeling framework
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
