Preliminary results of water status and metabolite content of three new crossbreed winegrape genotypes
This study presents the preliminary results obtained in 2022, of the evaluation of three new crossbreed winegrape genotypes and their parental varieties, grown under controlled irrigation (60% ETc) and rainfed conditions in a wine-growing area with scarcity of water and high temperatures (Murcia, southeast Spain). The genotypes MC16 and MC80 were obtained from crosses between the varieties ‘Monastrell’ and ‘Cabernet Sauvignon’, and MS104 from crosses between ‘Monastrell’ and ‘Syrah’ . The objective of this study was to analyse the physiological response and vegetative development of the 6 genotypes under the two irrigation conditions, and to study their effect on the content of soluble sugars and chlorophyll in the leaf. In rainfed conditions, the new genotypes presented lower reductions in all physiological and vegetative growth parameters, compared to those observed in ‘Monastrell’ (the reference variety in the area). Regarding stem water potential (ΨS), ‘Monastrell’ showed the greatest reduction (19%) and MS104 the lowest (1%). The parental varieties showed a greater reduction in stomatal conductance (gS) and photosynthetic activity (AN) values than the crossbreeds. Regarding vegetative growth, ‘Monastrell’ showed the greatest reductions, both for stem size and pruning weight (43% and 69%, respectively); while MC16 presents the lowest (4% and 13%, respectively). On the other hand, variations of chlorophyll and total soluble sugars content in the leaf were observed between genotypes. Nevertheless, only the average chlorophyll content was significantly affected by the irrigation treatment. The analysis of the new genotypes during successive years will allow us to identify if some of the crosses obtained could adapt better than ‘Monastrell’ to the semi-arid conditions of Murcia.
Acknowledgements: The authors thank Carlos V. Padilla, Eliseo Salmerón and Miguel Alcaraz for crop health control. This work was financed by the Ministerio de Ciencia e Innovación via project PID2020-119263RR-100.
1) Ruiz-García, et al. (2018) Nuevas variedades de vid obtenidas en la Región de Murcia. Actas Hortic., 80, 226–229.
Issue: ICGWS 2023
1 Molecular Genetic Improvement Team, Instituto Murciano de Investigación y Desarollo Agrario y Medi-oambiental (IMIDA), C/ Mayor s/n, La Alberca, 30150 Murcia, Spain
2 Irrigation and Stress Physiology Team, Instituto Murciano de Investigación y Desarollo Agrario y Medi-oambiental (IMIDA), C/ Mayor s/n, La Alberca, 30150 Murcia, Spain
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crossbreeding, drought, water potential, gas exchange, chlorophyll, sugars