Exploring the genetic diversity of leaf flavonoids content in a set of Iberian grapevine cultivars: preliminary results
The use of grapevine genetic diversity is a way to mitigate the negative impacts of climate change on viticulture systems. Leaf epidermal flavonoids (including flavonols and anthocyanins) are involved in plant defense mechanisms against environmental stresses, like high temperatures or excessive solar radiation [1,2]. Among other factors, they modulate light absorption, which reduces photoinhibition processes in photosynthetic tissues . Therefore, the identification of grapevine cultivars with an increased content on leaf epidermal flavonoids arises as a potential avenue to improve grapevine tolerance to some detrimental environmental stresses. Here, we analyzed the content in leaf flavonols and leaf anthocyanins at full-veraison in 63 genetically diverse grapevine cultivars from different Iberian regions grown under the same conditions by two alternative optical sensors (Dualex and MPM-100). Both non-invasive systems proved to be able of estimating leaf epidermal flavonoids content in a wide set of cultivars of high genetic diversity, providing highly-correlated results. Whilst we observed a moderate range of variation for leaf flavonols (they were found to vary by a 1.5-fold factor), a higher range of variation was observed for leaf anthocyanins, which varied by a 15.0-fold factor. In addition, this screening allowed us to detect some cultivars with a significant higher content on leaf epidermal flavonols than some widely extended grapevine cultivars, suggested as potential candidates with better adaptation capacity to the expected conditions due to climate change.
Acknowledgements: This work is part of the project “Diversidad genética en la vid y adaptación al cambio climático” (PID2020-120183RB-I00), funded by MCIN/AEI/10.13039/501100011033.
1) Steyn, W.J. et al. (2002) Anthocyanins in vegetative tissues: a proposed unified function in photoprotection. New Phytol., 155: 349-361, DOI 10.1046/j.1469-8137.2002.00482.x
2) Daryanavard, H.et al. (2023) Flavonols modulate plant development, signaling, and stress responses. Curr. Opin. Plant Biol., 72: 102350, DOI: 10.1016/j.pbi.2023.102350
Issue: ICGWS 2023
1 Instituto de Ciencias de la Vid y del Vino, Finca La Grajera, Ctra. de Burgos Km. 6, 26007 Logroño
2 Facultad de Biología, Universidad de Santiago de Compostela, 15872 Santiago de Compostela