| Autor: |
Mielke, Marcelo Schramm, Oliveira, Leticia Almeida, dos Santos, Martielly Santana, Pérez-Molina, Junior Pastor, Cerqueira, Amanda Freitas, Dalmolin, Ândrea Carla, Sousa-Santos, Catriane, de Brito, Carolina Reis |
| Předmět: |
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| Zdroj: |
New Forests; May2024, Vol. 55 Issue 3, p505-521, 17p |
| Abstrakt: |
The knowledge about vulnerability of tree seedlings to severe droughts is important in order to select the most suitable species for forestry plantations in a context of extreme weather events induced by global climate change. We conducted a study aiming to evaluate the effects of lethal leaf dehydration on seedlings of nine tropical tree species cohabiting the same forest ecosystem, but differing in terms shade tolerance, maximum height, geographical distribution, and leaf mass per area. For this, the percentual loss of photochemical efficiency, measured as the loss of maximum quantum efficiency of photosystem II during leaf dehydration (PL[Fv/Fm]) was investigated. Statistically significant differences were found between species for the average values of the relative water content (RWC) in which there is a loss of 10% and 50% of Fv/Fm. The species were separated in three groups: (a) species that showed the highest Fv/Fm losses at high RWC values, (b) intermediate species, and (c) species that showed significant Fv/Fm loss only at very low values of RWC. The PL[Fv/Fm] during leaf dehydration can be an useful methodology to select tree species for plantations in sites prone to severe droughts associated to extreme weather events. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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