Next Article in Journal
Natural and Anthropogenic Risks Hindering Successful Natural Reforestation in Former Polygraphus proximus Blandford Outbreak Areas
Previous Article in Journal
Genetic Diversity of the Endemic and Threatened Ecuadorian Tree, Ocotea rotundata s.l. (Lauraceae)
 
 
Please note that, as of 4 December 2024, Environmental Sciences Proceedings has been renamed to Environmental and Earth Sciences Proceedings and is now published here.
Font Type:
Arial Georgia Verdana
Font Size:
Aa Aa Aa
Line Spacing:
Column Width:
Background:
Abstract

Effect of Water Stress on Physiology and Carbon Balance in Seedlings of Different Eucalyptus Genotypes †

1
Cooperativa de Productividad Forestal, Departamento de Silvicultura, Facultad de Ciencias Forestales, Universidad de Concepción, Concepción 4030555, Chile
2
Centro Nacional de Excelencia para la Industria de la Madera (CENAMAD), Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
3
Bioforest S.A., Km 15 S/N Camino a Coronel, Concepción 4030555, Chile
4
Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción 4030555, Chile
*
Authors to whom correspondence should be addressed.
Presented at the 3rd International Electronic Conference on Forests—Exploring New Discoveries and New Directions in Forests, 15–31 October 2022; Available online: https://iecf2022.sciforum.net/.
Environ. Sci. Proc. 2022, 22(1), 55; https://doi.org/10.3390/IECF2022-13123
Published: 31 October 2022

Abstract

:
Eucalyptus is a fast-growing genus widely used in the forestry industry; however, in the plant’s early stages, plantations are susceptible to drought conditions and it is common to find high mortality rates and loss of productivity. Therefore, this study analyzed the physiological response photosynthesis (An) and predawn leaf water potential (ΨPLWP) and the change in carbon balance (C) in ten Eucalyptus genotypes exposed to different water deficits, with the hypothesis that it is possible to identify and differentiate genotypes with a tolerance to drought. Therefore, ten one-year-old genotypes were placed in greenhouse conditions and soil matric power (Ψs) was regulated in four levels: −0.03 MPa (control), −0.7 Mpa (slight stress), −1.5 Mpa (moderate stress) and −2.5 Mpa (chronic stress); each level was determined from the automated monitoring of soil conditions. The example considered in the experiment was tree stress per genotype × Ψs. The measurements of An and ΨPLWP considered tree measurement per individual (n = 9 per genotype × Ψs); in contrast, the Gross primary productivity (GPP) was estimated with destructive sampling (n = 3 genotype × Ψs). We found a significant relationship between water deficit and physiological response (a major deficit produced a reduction of An and ΨPLWP). E. nitens clones had a minor physiological variation and GPP maintained the same trend and proportionality between aerial and underground production. In contrast, two hybrids of E. nitens × E. globulus showed an immediate physiological change and variation in GPP, with increased underground production and stagnant aerial production. These results suggest that it is possible to differentiate genotypes with a tolerance to water deficit early. This will allow genotype selection according to the climatic conditions of each site, minimizing mortality and optimizing the available water resources.

Supplementary Materials

The presentation material of this work is available online at https://www.mdpi.com/article/10.3390/IECF2022-13123/s1.

Author Contributions

Conceptualization, L.G. and R.R.; methodology, L.G. and R.R.; resources, L.G., V.E., R.R. and D.B.; data curation, L.G.; writing—original draft preparation, L.G., R.R. and J.C.V.; writing—review and editing, L.G., R.R. L.B. and J.C.V.; funding acquisition, R.R. and V.E. All authors have read and agreed to the published version of the manuscript.

Funding

This work was funded by the government of Chile via CONICYT Fondecyt Regular Project 1190835, CONICYT FONDEF Project IT16I10087 and ANID BASAL FB210015, also funding for maintenance of these trials was provided by CMPC Forestal Mininco S.A., the Forest Productivity Cooperative at Universidad de Concepción Chile and support of Smurfit Kappa Colombia.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Acknowledgments

We gratefully acknowledge the support of many professionals from CMPC S.A. and Smurfit Kappa Colombia.

Conflicts of Interest

The authors declare no conflict of interest.
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Share and Cite

MDPI and ACS Style

Garcia, L.; Rubilar, R.; Emhart, V.; Bascuñan, L.; Bozo, D.; Valverde, J.C. Effect of Water Stress on Physiology and Carbon Balance in Seedlings of Different Eucalyptus Genotypes. Environ. Sci. Proc. 2022, 22, 55. https://doi.org/10.3390/IECF2022-13123

AMA Style

Garcia L, Rubilar R, Emhart V, Bascuñan L, Bozo D, Valverde JC. Effect of Water Stress on Physiology and Carbon Balance in Seedlings of Different Eucalyptus Genotypes. Environmental Sciences Proceedings. 2022; 22(1):55. https://doi.org/10.3390/IECF2022-13123

Chicago/Turabian Style

Garcia, Luz, Rafael Rubilar, Verónica Emhart, Luisa Bascuñan, Daniel Bozo, and Juan Carlos Valverde. 2022. "Effect of Water Stress on Physiology and Carbon Balance in Seedlings of Different Eucalyptus Genotypes" Environmental Sciences Proceedings 22, no. 1: 55. https://doi.org/10.3390/IECF2022-13123

APA Style

Garcia, L., Rubilar, R., Emhart, V., Bascuñan, L., Bozo, D., & Valverde, J. C. (2022). Effect of Water Stress on Physiology and Carbon Balance in Seedlings of Different Eucalyptus Genotypes. Environmental Sciences Proceedings, 22(1), 55. https://doi.org/10.3390/IECF2022-13123

Article Metrics

Back to TopTop