Plant growth and leaf-spot severity on eucalypt at different CO2concentrations in the air

Carlos Eduardo Oliveira Da Silva,Raquel Ghini

doi:10.1590/s0100-204x2014000300010

Carlos Eduardo Oliveira Da Silva, Raquel Ghini

Open Access

https://doi.org/10.1590/s0100-204x2014000300010

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Abstract

The objective of this work was to evaluate the effects of increased air-CO2 concentration on plant growth and on leaf-spot caused by Cylindrocladium candelabrumin Eucalyptus urophylla. Seedlings were cultivated for 30 days at 451, 645, 904, and 1,147 µmol mol-1 CO2 ; then, they were inoculated with the pathogen and kept under the same conditions for seven days. Increased CO2concentration increased plant height and shoot dry matter mass, and decreased disease incidence and severity. Stem diameter was not affected by the treatments. Increased concentrations of atmospheric CO2 favorably affect eucalypt growth and reduce leaf-spot severity.

Highlights

Crescimento de plantas e severidade da mancha foliar em eucalipto a diferentes concentrações de CO2 no ar Resumo – O objetivo deste trabalho foi avaliar os efeitos do aumento da concentração de CO2 do ar sobre o crescimento de plantas e sobre a mancha foliar causada por Cylindrocladium candelabrum em Eucalyptus urophylla
In 2011, the CO2 concentration was 391 μmol mol‐1, which exceeded the pre‐industrial levels in ~40% (Climate change 2013, 2013)
CO2 is a greenhouse gas that has a direct impact on plant growth and on disease epidemics, causing changes in pathogen‐host relationships

Summary

Introduction

Crescimento de plantas e severidade da mancha foliar em eucalipto a diferentes concentrações de CO2 no ar Resumo – O objetivo deste trabalho foi avaliar os efeitos do aumento da concentração de CO2 do ar sobre o crescimento de plantas e sobre a mancha foliar causada por Cylindrocladium candelabrum em Eucalyptus urophylla. Studying the impacts of rising CO2 concentrations, Santos et al (2013) observed that at high air‐CO2 concentrations the plantlets of two eucalyptus clones had longer disease incubation period and lower severity of wilt caused by Ceratocystis fimbriata. Ghini et al (2014) observed that increasing CO2 concentration decreased rust severity caused by Puccinia psidii on eucalypt clonal plantlets.

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