Gas exchange, biomass allocation and water-use efficiency in response to elevated CO2 and drought in andiroba (Carapa surinamensis, Meliaceae)

Oliveira, M. F.; Marenco, Ricardo Antonio

doi:10.3832/ifor2813-011

Cited by 9 publications

(6 citation statements)

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“…Agronomy 2021, 11, 818 2 of 15 Furthermore, in combination with water deficit, elevated CO 2 can help to alleviate some of the negative effects of the stress by enabling greater carbon assimilation, increasing iWUE and quantum efficiency [7]. Similar stimulation of growth has been reported for other tropical tree species grown under elevated CO 2 [10,11]. In some species, CO 2 appears to ameliorate the effects of water deficit through stomatal closure at higher CO 2 concentrations [12,13].…”

Section: Introductionmentioning

confidence: 76%

Climate Change Impacts on Cacao: Genotypic Variation in Responses of Mature Cacao to Elevated CO2 and Water Deficit

et al. 2021

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Climate change poses a significant threat to agricultural production in the tropics, yet relatively little research has been carried out to understand its impact on mature tropical tree crops. This research aims to understand the genotypic variation in growth and photosynthesis in mature cacao trees in response to elevated CO2 and water deficit. Six genotypes were grown under greenhouse conditions at ambient (ca. 437 ppm) and elevated CO2 (ca. 724 ppm) and under well-watered and water deficit conditions for 23 months. Leaf- and canopy-level photosynthesis, water-use efficiency, and vegetative growth increased significantly in response to elevated CO2. Water deficit had a significant negative effect on many photosynthetic parameters and significantly reduced biomass production. The negative effect of water deficit on quantum efficiency was alleviated by elevated CO2. Genotypic variation was observed in several parameters including stomatal conductance, stomatal density and index, quantum efficiency, and biomass production, indicating the potential to develop more climate-change-resilient genotypes that can cope with predicted future climate change conditions. Elevated CO2 reduced some of the negative effects of water deficit through changes in water-use efficiency and light utilisation and reduced the negative impact of water deficit on biomass accumulation, but this was genotype-specific.

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Section: Introductionmentioning

confidence: 76%

Climate Change Impacts on Cacao: Genotypic Variation in Responses of Mature Cacao to Elevated CO2 and Water Deficit

et al. 2021

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“…Munguba tree grew about 1.9 mm per month in diameter and 15 cm month -1 in height, which is higher than growth rates (in diameter) observed in andiroba (Carapa spp) under greenhouse conditions, 0.9 mm month -1 (Oliveira & Marenco, 2019). However, this growth rates is similar to that reported by Camargo & Marenco (2012) in andiroba in the open, 1.9 -2.0 mm month -1 (in diameter).…”

Section: Discussionmentioning

confidence: 38%

“…To estimate the leaf area per plant at the beginning and at the end of the experimental period, in four additional plants (total of 28 leaves) the central leaflet was measured (width and length) and the leaf area of the whole leaf (including the central leaflet) determined using a leaf area meter (Li-3000, Li-Cor, Lincoln, USA). Total biomass accumulation (g per plant, including leaves, stem and roots) was calculated using Equation 1, which was generated for andiroba saplings (Carapa surinamensis) by Oliveira & Marenco (2019):…”

Section: Methodsmentioning

confidence: 99%

Leaf phenology, growth and photosynthesis in Pseudobombax munguba (Malvaceae)

2019

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RESUMO Leaf phenology, growth and photosynthesis in Pseudobombax munguba (Malvaceae)Munguba (Pseudobombax munguba) is a tree often found in low-land forests of the Amazon region, and there is a paucity of data regarding its ecophysiology. The aim of this work was to determine photosynthetic rates and growth of munguba saplings and to describe leaf phenology of a munguba tree. In greenhouse-grown saplings, diameter growth, leaf expansion, photosynthesis and stomatal conductance were determined. To describe the relationship between photosynthesis and leaf expansion, regression analysis was used. It was also described the leaf phenology of an adult tree by observing foliage changes at one-week intervals for two years. The leaves completed their expansion in 18 days, and leaf greening was completed in 40 days. Photosynthesis positively correlated with leaf expansion, but there was no correlation between stomatal conductance and leaf growth. Growth in diameter was 1.8 mm month -1 . Relative growth rate was low, 0.010 g g -1 day -1 . In the adult tree, leaf shedding was concentrated in July-August and by the second week of September the tree had already produced new leaves. Leaf longevity of munguba is about 11 months. It is hypothesized that leaf phenology of munguba is associated with the increased solar radiation of the dry season.A munguba (Pseudobombax munguba) é uma árvore encontrada com frequência em florestas de baixios da Amazônia e há escassez de informação sobre a sua ecofisiologia. O objetivo deste trabalho foi determinar as taxas fotossintéticas e o crescimento de arvoretas de munguba e descrever a fenologia foliar de uma árvore adulta. Em arvoretas em casa de vegetação, taxas de crescimento em diâmetro, taxas de expansão foliar, fotossíntese e condutância estomática foram determinadas. Para descrever a relação entre a fotossíntese e expansão da folha foi utilizada análise de regressão. Também se descreveu a fenologia foliar de uma árvore adulta ao se observar visualmente as mudanças na folhagem em intervalos de uma semana durante dois anos. As folhas completaram sua expansão em 18 dias e o enverdecimento das folhas foi concluído em 40 dias. A fotossíntese correlacionou positivamente com a expansão foliar, mas não houve correlação entre condutância estomática e crescimento foliar. O crescimento em diâmetro das arvoretas foi de 1,8 mm mês -1 . A taxa de crescimento relativo foi baixa, 0,010 g g -1 dia -1 . Na árvore adulta, a queda de folhas concentrou-se em julho-agosto e para a segunda semana de setembro, a árvore já tinha produzido novas folhas. Concluiu-se que a longevidade foliar de munguba é de aproximadamente 11 meses. Hipotetiza-se que a fenologia foliar da munguba esteja associada com a maior radiação solar da estação seca.Palavras-chave: Amazônia; análise de crescimento; taxa assimilatória líquida; taxa de crescimento relativo; longevidade foliar.This is an open access article under the CC BY licence Creative Commons 2 Ricardo Antonio Marenco et al.

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“…From this point (termed Day zero), the first measurements of gas exchange parameters were recorded and moisture treatments of 100% field capacity (well‐watered) and 60% field capacity (water‐deficit) were commenced. A 60% field capacity was selected as many researchers maintained 50–60% field capacity for water stress studies under elevated CO 2 concentrations (Oliveira and Marenco, 2019a; Oliveira and Marenco, 2019b). Water holding capacity was determined according to Bajwa et al (2017).…”

Section: Methodsmentioning

confidence: 99%

Photosynthetic activity and water use efficiency of Salvia verbenaca L. under elevated CO₂ and water‐deficit conditions

Javaid

Florentine

Ashraf

et al. 2022

J Agronomy Crop Science

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Investigating the combined effects of elevated CO2 concentration and water‐deficit on weed plants is crucial to gaining a thorough understanding of plant performance and modifying agricultural processes under changing climate conditions. This study examined the effect of elevated CO2 concentration and water‐deficit conditions on leaf gas exchange, water use efficiency, carboxylation efficiency and the photosystem II (PSII) activity of two Salvia verbenaca L., varieties. These varieties were grown under two CO2 concentrations (ambient conditions of 400 ppm and elevated conditions of 700 ppm) and two water regimes (well‐watered [100% field capacity] and water‐deficit conditions [60% field capacity]) in laboratory growth chambers. For 12 days, at 2‐day intervals, (i) leaf gas exchange parameters (photosynthesis rate, stomatal conductance, transpiration rate (E) and intercellular CO2 concentration (Ci)), (ii) water use efficiency (WUE), (iii) intrinsic water use efficiency (IWUE), (iv) instantaneous carboxylation efficiency and (v) PSII activity (fluorescence, quantum yield of PSII, photochemical efficiency of PSII, photochemical quenching and photosynthetic electron transport) were measured. Water‐deficit conditions had negative effects on studied parameters of both varieties, whereas elevated CO2 concentration had positive effects on the gas exchange, water use efficiency and PSII activity of both. Salvia verbenaca varieties grown under water‐deficit conditions from Day 0 to Day 5 showed a partial recovery in most of the parameters when the resumption of the well‐watered regime was reinstituted on Day 6. Salvia verbenaca varieties grown under water‐deficit conditions were re‐watered on day 6 and indicated a partial recovery in all the parameters. A comparison of the two varieties showed that var. vernalis recorded higher values of gas exchange, quantum yield of PSII and photochemical efficiency of PSII than var. verbenaca, but the water use efficiency of var. verbenaca was higher than that of var. vernalis. These differences serve to illustrate the complexity of such studies and suggest that a detailed understanding of the nature of weed infestations is essential if optimum management control is to be practiced. Elevated CO2 concentration mitigated the adverse effects of water‐deficit conditions and thereby enhanced the adaptive mechanism of this weed by improving its water use efficiency. It is thus likely that S. verbenaca has the potential to take advantage of climate change by increasing its relative competitiveness with other plants in drought‐prone areas, suggesting that it could significantly expand its invasive range under such conditions.

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Gas exchange, biomass allocation and water-use efficiency in response to elevated CO2 and drought in andiroba (Carapa surinamensis, Meliaceae)

Cited by 9 publications

References 39 publications

Climate Change Impacts on Cacao: Genotypic Variation in Responses of Mature Cacao to Elevated CO2 and Water Deficit

Climate Change Impacts on Cacao: Genotypic Variation in Responses of Mature Cacao to Elevated CO2 and Water Deficit

Leaf phenology, growth and photosynthesis in Pseudobombax munguba (Malvaceae)

Photosynthetic activity and water use efficiency of Salvia verbenaca L. under elevated CO₂ and water‐deficit conditions

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Gas exchange, biomass allocation and water-use efficiency in response to elevated CO2 and drought in andiroba (Carapa surinamensis, Meliaceae)

Cited by 9 publications

References 39 publications

Climate Change Impacts on Cacao: Genotypic Variation in Responses of Mature Cacao to Elevated CO2 and Water Deficit

Climate Change Impacts on Cacao: Genotypic Variation in Responses of Mature Cacao to Elevated CO2 and Water Deficit

Leaf phenology, growth and photosynthesis in Pseudobombax munguba (Malvaceae)

Photosynthetic activity and water use efficiency of Salvia verbenaca L. under elevated CO2 and water‐deficit conditions

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Photosynthetic activity and water use efficiency of Salvia verbenaca L. under elevated CO₂ and water‐deficit conditions