Syrah and Grenache (Vitis vinifera) revealed different strategies to cope with high temperature

GALLO, AGUSTINA; PEREZ PEÑA, JORGE; GONZALEZ, CARINA VERONICA; PRIETO, JORGE

AUSTRALIAN JOURNAL OF GRAPE AND WINE RESEARCH

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2022

1322-7130

Background and aims: Global warming will threaten vineyard sustainability in warm and arid regions. Therefore, increasing water use efficiency (WUE) is essential for long-term viticulture sustainability. Nevertheless, studies concerning the response of stomata and WUE to temperature are scarce. We evaluated the effect of sustained warming in WUEand its components in varieties with contrasting stomatal behavior.Methods and results: We applied a 1.1 ºC increase in field-grown, well-watered plants during the growing season and compared them to control plants. We measured net assimilation (An), transpiration rate (E), stomatal conductance (gs), stomata density and length, intrinsic and yield WUE (WUEint and WUEyield). Gas exchange and WUEint in response to heating were variety dependent. Grenache heated plants increased An, gs, E and stomatal length but decreased WUEint. By contrast, gas exchange and WUEint were similar between Syrah heated and control plants. Both varieties decreased WUEyield in response to heating.Conclusions: An increase in air temperature decreased WUEint in Grenache; whereas Syrah could tolerate heating without modifying leaf functioning. We proposed these strategies to cope with heating as avoiding for Grenache and tolerant for Syrah in well-watered conditions.