Elevated CO2 Atmosphere Minimizes the Effect of Drought on the Cerrado Species Chrysolaena obovata

Abstract

Chrysolaena obovata stores inulin in the rhizophores, associated with drought tolerance. While crop plants are widely studied concerning the interactive effects of high [CO2] and drought, few studies reported these effects in native species. Here, we evaluated the combined effects of these factors on water status and fructan metabolism in C. obovata, a native Cerrado species. Two lots of plants were kept at 380 and 760 ppm CO2 in open-top chambers. In each, [CO2] plants were divided into four groups and cultivated under different water availability: irrigation with 100 (control), 75 (low), 50 (medium), and 25% (severe drought) of the water evapotranspirated in the last 48 h. In each, water treatment plants were collected at 0, 9, 18, and 27 days. On day 27, all plants were re-watered to field capacity and, after 5 days, a new sampling was made. Water restriction caused a decrease in plant moisture, photosynthesis, and in enzymes of fructan metabolism. These changes were generally more pronounced in 25% plants under ambient [CO2]. In the later, increases in the proportion of hexoses and consequent modification of the fructan chain sizes were more marked than under high [CO2]. The results indicate that under elevated [CO2], the negative effects of water restriction on physiological processes were minimized, including the maintenance of rhizophore water potential, increase in water use efficiency, maintenance of photosynthesis and fructan reserves for a longer period, conditions that shall favor the conservation of this species in the predicted climate change scenarios.

Different ways to die in a changing world: Consequences of climate change for tree species performance and survival through an ecophysiological perspective

“…In view of this increase in performance and productivity promoted by high [CO 2 ], even in the presence of abiotic stresses, should we really be concerned about the dynamics of the distribution and survival of forest species under a climate change scenario? The answer to this question is extremely complex because the beneficial effects of high [CO 2 ] found in some studies (Drake et al, 2011;Idso & Kimbal, 1997;Oliveira et al, 2016;Pérez-Jiménez, Hernández-Munuera, Piñero, López-Ortega, & del Amor, 2018;Radoglou & Jarvis, 1990;Rodrigues et al, 2016;Roy et al, 2016;Swann et al, 2016;Yu et al, 2014) are in direct contrast to the results of several other reports (Calvo et al, 2017;Clark, Clark, & Oberbauer, 2010;Faralli et al, 2017;Feeley, Joseph Wright, Nur Supardi, Kassim, & Davies, 2007;Voelker et al, 2017).…”

“…However, although CO 2 is considered one of the main villains of climate change, its real effect on the performance and survival of forest species remains extremely controversial (Ellsworth et al, ; Friedlingstein et al, ; Schimel, Stephens, & Fisher, ; Sitch et al, ). For example, in addition to the central role of CO 2 in driving climate change, several studies have shown that higher [CO 2 ] can enhance the performance and productivity of forest species (Drake et al, ; Lewis, Lloyd, Sitch, Mitchard, & Laurance, ; Norby et al, ; Norby, Wullschleger, Gunderson, Johnson, & Ceulemans, ; Yang, Donohue, Mcvicar, Roderick, & Beck, ), as well as mitigate the deleterious effects of some abiotic stresses (Oliveira, Silva, & Carvalho, ; Rodrigues et al, ; Roy et al, ; Swann, Hoffman, Koven, & Randerson, ).…”

“…Moreover, some morphological and morpho-anatomical changes induced by high [CO 2 ] may also enhance the vulnerability of tree species to abiotic stresses, as a result of increased transpiration, reduced water uptake, increased vulnerability to cavitation, and higher respiration (R) and photorespiration (P R ) rates. High [CO 2 ] can also compromise the interactions between plants and their pollinators, through phenology changes that higher [CO 2 ] can enhance the performance and productivity of forest species (Drake et al, 2011;Lewis, Lloyd, Sitch, Mitchard, & Laurance, 2009;Norby et al, 2005;Norby, Wullschleger, Gunderson, Johnson, & Ceulemans, 1999;Yang, Donohue, Mcvicar, Roderick, & Beck, 2016), as well as mitigate the deleterious effects of some abiotic stresses (Oliveira, Silva, & Carvalho, 2016;Rodrigues et al, 2016;Roy et al, 2016;Swann, Hoffman, Koven, & Randerson, 2016).…”

Climatic Predictors Influences VFWD Fungal Diversity Through Dominant Tree' Ecology in Beech Forests in the North-Eastern Romania

“…2017], and releasing it through deforestation leads to increasing atmospheric carbon [LISKI & al. 2000], with its known complex and negative effects, like global warming and precipitation changing [OLIVEIRA & al. 2016].…”

Efeito do déficit hí­drico e CO₂ elevado sobre substâncias fenólicas e ligninas do sorgo var. 'BRS 330'

“…Em outras espécies, tem-se notado que alterações bioquímicas resultantes da maior disponibilidade de carbono podem afetar a proporção de hexoses, com incremento na extensão da cadeia de 42 frutanos do tipo inulina, com foi observado no rizóforo de Chrysolaena obovata, espécie nativa do Cerrado do Brasil (Oliveira et al, 2016 fazem uma apreciação integrada de ajustes regulatórios do metabolismo primário em diferentes órgãos da planta de sorgo, induzidos por condições de interação de déficit hídrico e incremento de CO2.…”