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1.
Drought and temperature interaction on leaf hydraulic traits in grapevine
Elena Farolfi, Jan Reščič, Jacobs Spencer Harrison, Astrid Forneck, Jose Carlos Herrera, 2022, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: Global warming and increased frequency and/or severity of drought events are among the most threatening consequences of climate change for agricultural crops. Understanding the mechanisms of plant responses to both stressors is pivotal to successfully implement management strategies. Here we explored the effect of temperature on the development of grapevine leaves with particular focus on hydraulic traits under well-watered and water deficit conditions. We grew grafted grapevine (Vitis vinifera L. cv. Pinot noir) in two different greenhouse chambers (20/15°C vs 25/20°C day/night) and monitored their gas exchange, leaf size, stomatal density, chlorophyll fluorescence, pressure-volume (PV) curves, osmotic potential and petiole xylem anatomy. PV curves provided clear evidence that both, temperature and water availability, strongly affected the turgor loss point (TLP) as well as the connected physiological traits. Leaves developing at higher temperature exhibited a more conservative behaviour characterised by a lower gs max and a tighter stomatal closure in response to drought. The study further discusses the results considering the coordination of traits changing in tandem and implications in the face of climate change. Key message: The ambient temperature at which leaves develop impacts on its hydraulic traits and therefore on their successive response to drought
Ključne besede: drought, temperature, grapevine, xylem
Objavljeno v RUNG: 05.07.2024; Ogledov: 204; Prenosov: 1
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2.
Combined effects of early season leaf removal and climatic conditions on aroma precursors in ‘Sauvignon blanc’ grapes
Paolo Sivilotti, Rachele FALCHI, Jose Carlos Herrera, Branka Škvarč, Lorena Butinar, Melita Sternad Lemut, Marijan Bubola, Paolo SABBATINI, Klemen Lisjak, Andreja Vanzo, 2017, izvirni znanstveni članek

Opis: Early leaf removal around the cluster zone is a common technique applied in cool climate viticulture, to regulate yield components and improve fruit quality. Despite the increasing amount of information on early leaf removal and its impact on total soluble solids, anthocyanins and polyphenols, less is known regarding aroma compounds. In order to verify the hypothesis that defoliation, applied before or after flowering, could impact the biosynthesis of thiol precursors, we performed a two year (2013 and 2014) experiment on Sauvignon blanc. We provided evidence that differential accumulation of thiols precursors in berries is affected by the timing of defoliation and this impact was related to modifications in biosynthetic pathway. Furthermore, the possible interaction between leaf removal treatment and seasonal weather conditions, and its effect on the biosynthesis of volatile precursors are discussed. Our results suggested that in Sauvignon blanc the relative proportion of 4-S-glutathionyl-4-methylpentan-2-one (G-4MSP) and 3-S-glutathionylhexan-1-ol (G-3SH) precursors can be affected by defoliation, and this could be related to the induction of two specific genes encoding glutathione-S-transferases (VvGST3 and VvGST5), while no significant effects on basic fruit chemical parameters, polyphenols and methoxypyrazines were ascertained under our experimental conditions.
Ključne besede: early leaf removal, cluster exposure, thiol precursors, methoxypyrazines, glutathione S-transferase, Vitis vinifera
Objavljeno v RUNG: 31.08.2017; Ogledov: 4585; Prenosov: 0
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