Respuesta morfológica en diferentes especies de portainjertos en cítricos, sometidas a estrés salino e hídrico bajo condiciones de invernadero

The Citrus plants cultivation has a great importance worldwide, so high technologies for their agronomic management have been developed in different areas. The study and improvement of pest and diseases-resistant rootstocks, with tolerance to adverse abiotic conditions, is one of the subjects where researchers have focused in the most, since those conditions have caused high economic, social and environmental losses. Some of the most important problems affecting Citrus plants are the salinity stress and water stress both by excess and by lack of. These are the reasons why the behaviour of three rootstocks of Citrus plants, submited to salinity and water stress conditions under greenhouse were studied. Twelve treatments of three stress types (salinity, water lack and water excess) plus one control (optimal conditions) and three species of rootstocks (Cleopatra mandarin, lemon mandarin and sour orange) were established. For salinity, soil was kept at 6 dS/m (electrical conductivity), in water deficit 40% of field capacity was used, in water excess 150% of field capacity was established and in optimal conditions it was kept in <1 dS/m and field capacity. Height, number of leaves and stem diameter were measure every 10 days for three months; the rest of variables (number of branches, foliar area, stomatic density, crown diameter, crown volume, aerial dry weight, radicular dry weight and total dry weight) were obtained or measured at the end of the experiment. To know the effect of the stress type over each rootstock, ANOVA analyses (both parametrics and no parametrics) and 95%-confidence post-hoc Tukey or DGC tests were run. In addition, all variables were correlated between them by means of a Pearson test. Statistical significant differences were found in the interaction between the stress type and the rootstock species, some of the variables (height, number of leaves, number of branches, foliar area, etc.) were only responding to the stress type or the rootstock type, individually. In conclusion, the type of stress that negatively affected the most was the water deficit, whilst the lemon mandarin rootstock showed the best behaviour and had the significantly highest values for most of the variables. Key words: drought, stress, rootstock, conductivity, salinity, mandarin lemon, sour orange, ‘Cleopatra’ mandarin.

• Glavni autor: Landin García, Wagner Xavier (author)
• Format: bachelorThesis
• Jezik: spa
• Izdano: 2021
• Teme: PORTAINJERTOS; CÍTRICOS; ESTRES
• Online pristup: https://dspace.unl.edu.ec/jspui/handle/123456789/23927