Development of experimental structure and influence of high CO2 concentration in maize cro

Silva, João Batista Lopes da; Ferreira, Paulo Afonso; Pereira, Eduardo Gusmão; Costa, Luis Claudio; Miranda, Glauco Vieira

doi:10.1590/s0100-69162012000200010

Cited by 14 publications

(13 citation statements)

References 15 publications

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“…The soybean plants were cultivated inside Open Top Chamber (OTC) facilities used by Silva et al, (2012), composed by rectangular modules of 2.0 m height and 1.4 x 1.8 m section, with a pyramidal top that has a height of 0.5 m and a 19% of exchange-area relative to the base area. Each chamber had a steel structure covered with a transparent plastic film and opposite side vents to match the internal microclimate to natural environmental conditions.…”

Section: Facilities and Controllersmentioning

confidence: 99%

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Pereira-Flores¹,

Justino²,

Ruiz‐Vera³

et al. 2016

Aust J Crop Sci

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Future climatic scenarios can influence crop yield levels and induce hunger if no actions are taken. In this study, we evaluated the effect of increased temperature and CO 2 concentration on soybean yield components and biomass partitioning, that ultimately determine the crops productivity. This is conducted for two soybean genotypes that differ in their canopy and life cycles. Experiments were set as follows: a) T1 -ambient temperature and 390 molCO 2 •mol -1 , b) T2 -ambient air temperature +2.7 o C and ambient CO2, and c) T3 -ambient air temperature + 2.7 o C and 750 molCO 2 •mol -1 . Results indicate that soybean under elevated CO 2 and temperature (T3), were taller and grains weighed more than under the ambient conditions in both cultivars types. However, yield has not increased substantially due to reductions in the ratio of number of branch/plant, pods/branch and grains/branch which lead also to a lesser number of total pods and grains per plant. The increase of temperature favored the number of pods and grains on branches in the modern type cultivar, and on racemes in the old cultivar. This results in more yield in both cultivars versus plants grown in the current ambient, and higher CO 2 concentration plus temperature. In both cultivars, the pods and grains partition were higher on the ontogenically oldest four branches and racemes, with decrease in the other upper ones. In addition, the biomass allocation in vegetative tissues was higher than reproductive biomass, with intensity cultivar dependent. We concluded that in future the yield could be limited by reduction of the numbers of branches and racemes in plant, and by alteration at source-sink relation, thus, indicating that changes in canopy architecture are needed to better take advantage of the increasing concentration of CO 2 .

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Section: Facilities and Controllersmentioning

confidence: 99%

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Pereira-Flores¹,

Justino²,

Ruiz‐Vera³

et al. 2016

Aust J Crop Sci

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“…No caso do CO2, sendo este gás fonte de carbono para o processo fotossintético, espera-se que a elevação de seus níveis aumente a produção de fotoassimilados, promovendo uma maior taxa de crescimento das plantas, resultando em maiores produtividades (STRECK, 2005;MARTINEZ et al, 2015). Por outro lado, a elevação da concentração de CO2 resultará em redução da condutância estomática, em razão da redução da abertura dos estômatos, reduzindo a taxa de transpiração das plantas (LEAKEY, 2009;SILVA et al, 2012), o que por sua vez irá afetar a quantidade de água absorvida pelo sistema radicular, resultando em redução da quantidade de nutrientes a serem absorvidos. Esse fato poderá levar à necessidade de adubações em maior quantidade de modo a atender as necessidades da cultura para obtenção de altas produtividades (WALTER et al, 2015).…”

Section: Impactos Da Variabilidade E Das Mudanças Climáticas Nas Cult...unclassified

Agricultura irrigada no Brasil: ciência e tecnologia

2022

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O desenvolvimento e crescimento da irrigação e da agricultura irrigada sem dúvida passam pelo desenvolvimento tecnológico, tanto relacionado aos equipamentos quanto ao sistema de produção irrigada. A tecnologia embarcada nos sistemas irrigados tem ampliado de forma significativa nos últimos anos, a automação tem sido efetivamente utilizada em sistemas de irrigação por aspersão e localizada, auxiliando de forma efetiva no controle da irrigação. Destacam-se também as tecnologias associadas ao manejo da irrigação, permitindo aplicação da água de forma técnica, garantindo produção e produtividade com eficiência no uso do recurso hídrico, energia e mão-de-obra. O uso maciço de imagens via satélite e vants em nível de projeto, manejo e acompanhamento da lavoura irrigada, têm ampliado de forma significativa os controles de uso da água e estimativas de produtividade. A tecnologia de irrigação no Brasil expandiu-se de forma importante nos últimos, seja por meio de um parque industrial de alto nivel e uma rede de revendas técnicas, seja pela expansão da pesquisa e pelo desenvolvimento técnico nas universidades e instituições de pesquisa. Toda esta infraestrutura tecnológica tem sido colocada à disposição de uma agricultura irrigada aliada a segurança alimentar e a sistema de produção sustentável. Este livro contempla diferentes abordagens da agricultura irrigada no Brasil no aspecto da técnica e da tecnologia, constituindo uma importante contribuição de inúmeros especialistas para o desenvolvimento sustentável da agricultura irrigada brasileira e mundial.

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“…The experiment was conducted in open-top chambers installed outside a greenhouse, as described by Silva et al (Silva et al 2012), located at the Federal University of Viçosa,Campus Florestal,Minas Gerais State,Brazil (575 m a.s.l.,19°53'84"S 44°25'68"E). Individual threemonth-old saplings of Acrocomia aculeata (Jacq.)…”

Section: Experimental Conditionsmentioning

confidence: 99%

Increased atmospheric CO2 changes the photosynthetic responses of Acrocomia aculeata (Arecaceae) to drought

2019

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Water availability is the main factor that explains current patterns of palm abundance. However, the interaction between water stress and increasing atmospheric CO 2 concentrations caused by climatic change and its effects on palm physiology remain poorly known. Macauba palm is a widespread Neotropical species commonly found in ecosystems subjected to seasonal drought and has potential use in oil production. The present work investigated the influence of increased CO 2 concentrations on photosynthetic responses to drought in macauba palm plants. Exposure to increased CO 2 concentrations led to up-regulation of photosynthesis through higher stomatal conductance and improved light and water use efficiency. Macauba palm plants under water stress, irrespective of CO 2 concentration, were able to maintain constant levels of proline and chlorophyll, while preventing oxidative damage. Plants grown at higher CO 2 concentrations were more capable of recovering from drought due to higher Rubisco carboxylation rate (Vc max) and electron transport rate (J max), which prevented a reduction in total dry mass at the end of the stress period. Stomatal control of photosynthesis, coupled with the prevention of severe damage under stress, would allow efficient biomass production by the macauba palm under future scenarios of climate change.

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Development of experimental structure and influence of high CO2 concentration in maize cro

Abstract: ABSTRACT:Maize is a C 4 plant that shows few or no response to high [CO 2 PALAVRAS-CHAVE: câmaras de topo aberto, mudanças climáticas, Zeamays L.Development of experimental structure and influence of high CO 2 concentration in maize cropEng.

Cited by 14 publications

References 15 publications

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Agricultura irrigada no Brasil: ciência e tecnologia

Increased atmospheric CO2 changes the photosynthetic responses of Acrocomia aculeata (Arecaceae) to drought

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