Morpho-anatomical and hydraulic traits RELATIONSHIPS BETWEEN TWO
GRAPEVINE VARIETIES FROM A COMMERCIAL VINEYARD IN CHILE
RELACIÓN ENTRE RASGOS HIDRÁULICOS Y MORFO-ANATÓMICOS EN DOS
VARIEDADES DE VID CULTIVADAS EN UN VIÑEDO COMERCIAL DE CHILE
VILLALOBOS-GONZÁLEZ, Luis*; MUÑOZ-ARAYA, Mariana; FRANCK, Nicolás; PASTENES, Claudio Departamento de Producción Agrícola, Facultad de Ciencias Agronómicas, Universidad de Chile, Chile. *Corresponding author: firstname.lastname@example.org
Abstract: Climate change has become a threat to wine industry due to increases in temperature and reductions of water in Mediterranean climates. Therefore, it is necessary to improve our knowledge about mechanisms conferring resistance to water shortages in grapevines varieties, especially at the leaf level which includes the evaporative sites in plants and experience the highest water tension through their hydraulic systems. To evaluate morphoanatomical and hydraulic traits of leaves from Carménère (C) and Syrah (S), shoots were collected during the 2016-17 growing season. Also, we assess the response of the stomatal conductance (gs) to water stress in C and S field-grown plants exposed to two irrigation levels (I: irrigated and NI: non-irrigated) from the Cachapoal Valley. C showed a more sensitive response of gs to dehydration than Syrah, probably by the higher π0 and RWCTLP showed in C leaves. Also, both varieties showed similar negative trends of Kleaf during drying, but, a higher Kleaf was showed in S, when compared all data higher than -1.2 MPa. This trait could be related to the higher values in major vein density (MVD) showed in S. Finally, due to the higher LDMC and MVD suggest that S leaves are more tolerant to dehydration than C, although, C leaves, which close their stomata at a less negative Ψ could be avoiding water stress and loosing less water.
Keywords: leaves, water stress, water relations, ABA, Vitis vinifera.