1. Drought and temperature interaction on leaf hydraulic traits in grapevineElena Farolfi, Jan Reščič, Jacobs Spencer Harrison, Astrid Forneck, Jose Carlos Herrera, 2022, published scientific conference contribution abstract Abstract: 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
Keywords: drought, temperature, grapevine, xylem
Published in RUNG: 05.07.2024; Views: 635; Downloads: 3
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2. Pregled pridelave grozdja in vina žlahtne vinske trte (Vitis vinifera l.) 'pinela' in 'zelen' v Vipavski dolini : diplomsko deloVeronika Kos, 2024, undergraduate thesis Abstract: V tej diplomski nalogi smo s pomočjo anketiranja pridelovalcev pregledali, na kakšen način se prideluje grozdje in vino pri sortah Vitis Vinifera L. 'Zelen' in 'Pinela' v zgornji Vipavski dolini. Pomembno je, da razumemo, da ti dve sorti rasteta na flišni podlagi in pod submediteranskim podnebjem. Ampelografski opis nam razloži, kako ti dve sorti ločimo od ostalih. V nadaljevanju smo s pomočjo anketiranja pridelovalcev teh dveh sort dobili vpogled v način pridelave grozdja, tipe rezi, uporabo ukrepa razlistanja in ugotovili, da je večina vinogradov obrnjenih na vzhod ali zahod. V povprečju dosega mošt/grozdje sorte 'Zelen' višji pH kot sorta 'Pinela', kar tudi vzporedno pojasni, da ima 'Zelen' nižje kisline. Količina pridelanega grozdja se vsako leto povečuje, v grafu lahko vidimo enakomerno rast pri sorti 'Zelen', nekoliko manj enakomerno pa pri sorti 'Pinela', kar je posledica zunanjih dejavnikov. Iz ankete je razvidno, da se tako pri maceraciji kot tudi pri skladiščenju največkrat uporabljajo posode iz nerjavečega jekla, nekateri pa uporabljajo tudi lesene sode.
Keywords: diplomske naloge, pinela, zelen, Vipavska dolina, pridelava, vino, grozdje
Published in RUNG: 21.03.2024; Views: 1441; Downloads: 25
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3. Sodobno vinogradništvo in vinarstvo : novosti in izziviErika Jež, Jan Reščič, 2023, independent professional component part or a chapter in a monograph Abstract: Prispevek o izzivih in novostih današnjega vinogradništva. Med izzivi so predstavljene podnebne spremembe, evropska politika, zaraščanje površin, tržne strategije in obnašanje potrošnikov ter izobraževanje mladih kmetov. Med novostmi pa je predstavljena sodobna tehnologija in digitalizacija, regenerativno vinogradništvo, krožno gospodarstvo in avtentičnost.
Keywords: vinogradništvo, vinarstvo, izzivi, novosti, Slap
Published in RUNG: 07.02.2024; Views: 1320; Downloads: 0
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4. Time vs drought : leaf age rather than drought drives osmotic adjustment in V. vinifera cv. Pinot NoirElena Farolfi, Jan Reščič, 2023, published scientific conference contribution abstract Abstract: Global warming and increased frequency and/or severity of drought events are among the most threatening consequences of climate change for agricultural crops. In response to drought, grapevine (as many other plants) exhibits osmotic adjustment through active accumulation of osmolytes which in turn shift the leaf turgor loss point (TLP) to more negative values, allowing to maintain stomata opened at lower water potentials1. We investigated the capacity of Pinot noir leaves to modulate their osmotic potential as a function of: (i) time (seasonal osmoregulation), (ii) growing temperatures, and (iii) drought events, to enhance comprehension of the resilience of grapevines in drought conditions. We performed trails under semi-controlled field conditions, and in two different greenhouse chambers (20/15 °C vs 25/20 °C day/night). For two consecutive vegetative seasons, grafted potted grapevines (Pinot noir/SO4) were subjected to two different water regimes for at least 30 days: well-watered (WW) and water deficit (WD). Via pressure-volume (PV) curves and osmometer measurements we derived the leaf osmotic adjustment capability and TLP, while monitoring the plant gas exchange and water potential. Surprisingly, lower water potentials in WD vines throughout the season and in all situations (field and greenhouse) did not trigger osmoregulation, changes in TLP nor a modification of the modulus of elasticity. PV curves provided clear evidence that both temperature and water availability do not stimulate active osmotic adjustment in Vitis vinifera cv. Pinot Noir. Conversely, there is a clear impact of seasonal osmoregulation throughout the growing season2, decreasing the osmotic potential at full turgor by an average of 0.46 MPa in 90 days. Lack of osmotic adjustment in response to drought observed in this cultivar suggests Vitis genotypes have a broad spectrum of responses to drought and the strategy adopted to cope with it is highly dependent on the cultivar under analysis.
Keywords: grapevine, drought, osmotic adjustment, osmoregulation, turgor loss point
Published in RUNG: 21.11.2023; Views: 1317; Downloads: 2
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5. Regenerativno vinogradništvoErika Jež, Jan Reščič, 2023, popular article Abstract: Potrošnniški način življenja novodobne družbe je predvsem mlajše generacije spodbudil k iskanju rešitev za ohranitev našega planeta. Vinogradništvo je kmetijska dejavnost, ki lahko pomembno prispeva k ustvarjanju boljšega sveta za prihodnje generacije. Največji potencial v vinogradu sta prav skrb za zdrava tla in ohranjanje biotske raznovrstnostni, ki sta temeljni zahtebvi za vse regenerativne vinogradnike.
Keywords: regenerativno vinogradništvo, podnebne spremembe, agroekologija, tla
Published in RUNG: 17.11.2023; Views: 1230; Downloads: 0
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8. Podnebne spremembe v vinogradih: prilagajanje na sušni stres : predavanje na 61. mednarodnem kmetijsko-živilskem sejmu Agra, 29. 8. 2023, Gornja RadgonaJan Reščič, Alain Deloire, Anne Pellegrino, Katja Šuklje, 2023, unpublished conference contribution Abstract: S posledicami podnebnih sprememb se že nekaj časa soočamo tudi v slovenskem vinogradniškem prostoru. In čeprav vinska trta, zaradi globokega koreninskega sistema, velja za precej dobro prilagodljivo rastlino na pomanjkanje vode oziroma sušo, je za rast, rodnost in kakovost grozdja zelo pomembno kdaj, v kateri razvojni fazi se pojavi sušni stres ter koliko časa pomanjkanje vode traja. Prav tako, ni vsak sušni stres nujno škodljiv.
Keywords: vinska trta, sušni stres, podnebne spremembe, ukrepi
Published in RUNG: 04.09.2023; Views: 1495; Downloads: 0
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9. Pinela in zelen : lokalni vinski sorti Vipavske dolineJan Reščič, Erika Jež, 2023, popular article Abstract: Pri veliki večini poznavalcev in ljubiteljev vina so še vedno najbolj zastopane tako imenovane svetovne sorte. A prav v širokem naboru vseh teh vin ljubitelji vedno pogosteje iščejo nekaj, kar je drugačno, manj znzno - vina iz sort, ki so značilne samo za določeno območje.
Keywords: pinela, zelen, lokalne vinske sorte, restavracija Calypso, kulinarika
Published in RUNG: 12.06.2023; Views: 1559; Downloads: 0
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