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- Title
Morpho-physiological responses in Cedrela fissilis Vell. submitted to changes in natural light conditions: implications for biomass accumulation.
- Authors
Sanches, Maria; Marzinek, Juliana; Bragiola, Natália; Terra Nascimento, André
- Abstract
Key message: The initial photoinhibition observed when Cedrela fissilis was transferred from shade to full sunlight was not severe enough to affect their biomass accumulation. Abstract: We investigated the growth and, morphological and physiological changes in Cedrela fissilis, a tropical tree species known for its high-quality wood, when subjected to changes in natural light conditions. We assessed the magnitude of photoinhibition when plants that were acclimated to shade were transferred into full sunlight and also assessed the impact of probable photoinhibition on the leaf morphology and growth of C. fissilis. We cultivated plants under three conditions: beneath the canopy (shade), under full sunlight, and transferring shade plants to full sunlight. During the period of the experiment (7 months), C. fissilis had 100 % survival in all treatments including shade conditions which corresponded to 1 % of light available compared to full sunlight. The growth was reduced under the shade, but the specific leaf area and biomass allocated to leaves were higher. After the change from shade to full sunlight conditions, reductions in potential photochemical yield ( F / F ) were detected in both predawn and midday measurements, characterizing the occurrence of photoinhibition. However, 30 days after the transfer, the mean value of F / F for those plants was 0.79, similar to that reached by plants permanently under full sunlight or shade conditions. The recovery of photoinhibition was followed by increases in the electron transport rates. Among the transferred plants, alterations in leaf structure and a shift in biomass partitioning patterns were observed. The photoinhibition that was detected early in the experiment was not severe enough to impact the relative growth rate and biomass accumulation. Our results show that C. fissilis can grow under the shade or full sunlight. However, when shade plants were transferred to full sunlight, they reached an efficient acclimation to the new environment through physiological alterations in their leaves and morphological modifications in the whole plant.
- Subjects
PLANT biomass; CEDRELA; EFFECT of solar radiation on plants; PLANT morphology; BIOACCUMULATION in plants
- Publication
Trees: Structure & Function, 2017, Vol 31, Issue 1, p215
- ISSN
0931-1890
- Publication type
Article
- DOI
10.1007/s00468-016-1474-6