Tuber aestivum as an alternative to Tuber melanosporum for Quercus ilex truffle plantations under climate change scenarios: tolerance to high summer temperatures and drought
Agricultural abandonment is nowadays one of the largest land use changes in Europe, especially in Mediterranean areas. However, this abandonment can be an opportunity for ecological restoration. Truffle plantations, made up of a forest tree species mycorrhized with a fungi of the genus Tuber, are a...
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| Formato: | tesis de maestría |
| Fecha de publicación: | 2022 |
| País: | España |
| Recursos: | Universidad de Alcalá (UAH) |
| Repositorio: | e_Buah Biblioteca Digital Universidad de Alcalá |
| Idioma: | inglés |
| OAI Identifier: | oai:ebuah.uah.es:10017/55093 |
| Acesso em linha: | http://hdl.handle.net/10017/55093 |
| Access Level: | acceso abierto |
| Palavra-chave: | Ecosystem restoration Hotter drought Fluorescence of Photosystem II Leaf water potential Photosynthesis VDI Restauración de ecosistemas Sequía más cálida Fluorescencia del Fotosistema II Potencial hídrico de la hoja Fotosíntesis IDV Medio Ambiente Environmental science |
| Resumo: | Agricultural abandonment is nowadays one of the largest land use changes in Europe, especially in Mediterranean areas. However, this abandonment can be an opportunity for ecological restoration. Truffle plantations, made up of a forest tree species mycorrhized with a fungi of the genus Tuber, are a restoration strategy with a great potential to obtain ecological services together with economic benefit. Tuber melanosporum, one of the most valuable truffles in Europe, is susceptible to extreme climate conditions and has decline its production due to climate change. Tuber aestivum can develop under harsh climate conditions. The objective was to compare the performance of Quercus ilex seedlings mycorrhized with T. melanosporum to those with T. aestivum, under present and future summer thermic environments and three drought intensities. Seedlings were evaluated periodically for visual damage index (VDI) through the summer. In the middle of summer, maximum stress moment, physiological performance of the seedlings was measured (water stress and photosynthetic performance). Increment of summer temperatures was the most negative factor on seedling performance, independently of the mycorrhizal species or the drought intensity. High temperatures strongly incremented VDI over the time and decreased leaf water potential, but did not damage the photosynthetic machinery (Fv/Fm) and capacity (ɸPSII and Anet) nor produced mortality. Drought had minor effects under present temperature environment but increased synergistically the negative effects of the future increased temperatures. Seedlings mycorrhized with T. aestivum had a better performance that those with T. melanosporum. In general, T. aestivum seedlings had lower VDI and higher leaf water potential, than those with T. melanosporum. Consequently, results demonstrate that T. aestivum is a potential alternative for truffle plantations to T. melanosporum for the drier and hotter regions or for areas where harsh conditions are predicted in the future due to climate change. |
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