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Título: | Water distribution and ionic balance in response to high CO 2 treatments in strawberries (Fragaria vesca L. cv. Mara de Bois) |
Autor: | Blanch Rojo, María CSIC ; Sánchez-Ballesta, M. Teresa CSIC ORCID ; Escribano, M. Isabel CSIC ORCID ; Merodio, Carmen CSIC ORCID | Fecha de publicación: | 2012 | Editor: | Elsevier | Citación: | Postharvest Biology and Technology 73: 63- 71 (2012) | Resumen: | The main organic (acids, amino acids and sugars) and inorganic (mono and divalent cations) solutes associated with changes in water status in response to low temperature and high CO 2 levels were analyzed in untreated and 20% or 40% CO 2 treated strawberries (Fragaria vesca L. cv. Mara de Bois) stored at 0°C. Intercellular water distribution and cellular tissue integrity were visualized using low temperature scanning electron microscopy (LT-SEM). The results indicated that high CO 2 treatments prevented the weight loss and cell structure disorganization observed in untreated strawberries. However, there were differences in water loss regulation dependent on CO 2 levels. In addition to mediating osmotic adjustment, treatment with 20% CO 2 had a protective effect on cellular structure and prevented the movement of water into the intercellular spaces. Specifically, an accumulation in total sugars and proline were detected in 20% CO 2-treated fruit. Moreover, water loss was controlled in these fruit and K +/Na + homeostasis maintained similar to that found in freshly harvested fruit. By contrast, 40% CO 2 controlled water loss, but the intercellular spaces were filled with aqueous solution, possibly as a result of a change in water status. Moreover, these changes were associated with an increase in free soluble Ca 2+. In view of the opposite patterns of accumulation in malic, succinic acid, γ-aminobutyric acid (GABA) and glutamate found when comparing 20% and 40% CO 2 treated strawberries, we suggest that their corresponding metabolic pathways play a regulatory role in CO 2 tolerance. © 2012 Elsevier B.V.. | URI: | http://hdl.handle.net/10261/82050 | DOI: | 10.1016/j.postharvbio.2012.06.003 | Identificadores: | doi: 10.1016/j.postharvbio.2012.06.003 issn: 0925-5214 |
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