Physiological response of Solanum phureja under water deficit
Introduction. The parameters of physiological response to drought stress are the conjugation of a series of attributes of slow or fast action. The gas exchange variables are classified as fast-acting, and their level of occurrence or affection depends on the interaction between factors such as genotype, duration and intensity, and the phenological stage of occurrence of the stress. Objective. To identify the levels of physiological response of Solanum phureja under progressive water deficit stress. Materials and methods. The experiment was conducted between 2019 and 2020, under semi-controlled conditions at the Obonuco Research Center of the Colombian Agricultural Research Corporation, where four potato cultivars were planted, half of the trial was maintained with irrigation at field capacity and the other part was suspended to induce water deficit stress for 15 days, then rehydrated; variables of gas exchange, chlorophyll and photosynthetic efficiency were evaluated every three days. Results. Statistically significant differences were presented, with the maximum values of gas exchange in plants of the control treatment with 16.67 µmol m-2 s-1 photosynthesis rate (A); 0.34 mol m-2 s-1 stomatal conductance (gs) 5.5 mmol m-2 s-1 transpiration (E) and in stress 1.17 µmol m-2 s-1 (A); 0.013 mol m-2 s-1 (gs); 0.29 mmol m-2 s-1 (E). As for chlorophyll content, values between 451.7 and 474.69 m-2 s-1 were presented with irrigation and without irrigation, respectively. Conclusions. Stomatic closure was the earliest response to water deficit, and potato plants showed recovery of gas exchange values after the supply of irrigation following stress. Finally, three levels of physiological response were identified: mild, moderate and severe stress according to the intensity and duration of stress, which is useful for future studies and irrigation schedules.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Universidad de Costa Rica
2024
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| Online Access: | https://revistas.ucr.ac.cr/index.php/agromeso/article/view/55692 |
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