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iForest - Biogeosciences and Forestry

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Growth and physiological acclimation to shade in young plants of Adesmia bijuga Phil., a critically endangered species in central Chile

Marco A Yáñez (1)   , Persy Gómez (2), John Gajardo (3), Sergio Espinoza (4)

iForest - Biogeosciences and Forestry, Volume 14, Issue 4, Pages 307-312 (2021)
doi: https://doi.org/10.3832/ifor3640-014
Published: Jul 01, 2021 - Copyright © 2021 SISEF

Research Articles


Adesmia bijuga Phil. is an endemic and endangered shrub species of central Chile. Its potential shade intolerance is one of the leading hypotheses for its vigor loss when the species grows beneath closed canopies. The objective of this study was to assess the growth and physiological acclimation to the shade of young plants of A. bijuga. A nursery experiment was established with three light levels based on the interception of photosynthetic active radiation (PAR) (TRT0: control at full sun; TRT60: 60% shaded; TRT90: 90% shaded), and maintained for 71 days during the summer season. Growth and leaf morpho-physiological responses were evaluated at the beginning, at the middle, and at the end of the experiment. The shading treatment increased plant height (H), live crown percentage (Lcrown), and specific leaf area (SLA) compared to the control treatment at full sun. However, light-saturated photosynthetic rate (Amax), dark respiration rate (Rd), and light compensation point (Γi) were higher in TRT60 than in the other treatments, while no differences were found among treatments for the apparent quantum yield (α). At this stage of plant development, our results suggest high acclimation plasticity of A. bijuga to light levels; however, a semi-shade environment (i.e., TRT60) favored a better performance of the species.

  Keywords


Adesmia bijuga, Shade Tolerance, Photosynthesis, Light Acclimation, Forest Restoration

Authors’ address

(1)
Marco A Yáñez
Núcleo Científico Multidisciplinario. Universidad de Talca. 2 Norte 685, Talca. P.O. Box 747 (Chile)
(2)
Persy Gómez 0000-0002-2244-1152
Jardín Botánico, Universidad de Talca, Casilla 747, Talca (Chile)
(3)
John Gajardo 0000-0003-3368-5491
Instituto de Bosques y Sociedad, Facultad de Ciencias Forestales y Recursos Naturales, Universidad Austral de Chile, Campus Isla Teja, Valdivia (Chile)
(4)
Sergio Espinoza 0000-0002-6073-2778
Facultad de Ciencias Agrarias y Forestales, Universidad Católica del Maule, Avenida San Miguel, 3605 Talca (Chile)

Corresponding author

 
Marco A Yáñez
marcoyanez@utalca.cl

Citation

Yáñez MA, Gómez P, Gajardo J, Espinoza S (2021). Growth and physiological acclimation to shade in young plants of Adesmia bijuga Phil., a critically endangered species in central Chile. iForest 14: 307-312. - doi: 10.3832/ifor3640-014

Academic Editor

Gianfranco Minotta

Paper history

Received: Sep 01, 2020
Accepted: Apr 19, 2021

First online: Jul 01, 2021
Publication Date: Aug 31, 2021
Publication Time: 2.43 months

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