Caracterização Fotossintética Da Espécie Isohídrica Pata-De-Elefante Em Condições De Deficiência Hídrica

Bertolli, Suzana Chiari; Souza, Juliano de; Souza, Gustavo Maia

doi:10.1590/1983-21252015v28n322rc

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…Regarding the intrinsic water-use efficiency (iWUE), obtained by the ratio between photosynthetic rate and stomatal conductance, it is noted that the intercropping of buffelgrass and forage watermelon resulted in considerable increases (26.7 and 21.7%, respectively) in the iWUE of the Nopalea forage cactus plants, in comparison with the monoculture system ( Figure 5A). The increase in the iWUE values indicate that there was an increase of net photosynthesis even with a lower stomatal conductance, that is, the g s reduction was relatively greater than the reduction in A, supporting the occurrence of stomatal limitation (Bertolli et al, 2015). Silva et al (2013) The addition of soil mulch stimulated the iWUE by 26.5% ( Figure 5B).…”

Section: Resultsmentioning

confidence: 76%

Gas exchanges and water-use efficiency of Nopalea cochenillifera intercropped under edaphic practices

et al. 2020

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The Nopalea forage cactus (Nopalea cochenillifera) is the main xerophilic species cultivated in Brazil, highlighted as a compatible biological element with the semiarid environment. However, studies on its physiological aspects are still scarce. In this context, an experiment was performed in the Pendência Experimental Station, belonging to the State Company of Agricultural Research of Paraíba (EMEPA-PB), municipality of Soledade, state of Paraíba, Brazil, aiming to evaluate the gas exchanges and the water-use efficiency of intercropped Nopalea Cochenillifera plants in the soil under different edaphic managements. The treatments were distributed in randomized blocks, with three replications in a 2 × 5 factorial scheme, corresponding to the soil without and with mulch and five types of cultivation of Nopalea forage cactus, in monoculture and intercropped with forage watermelon, millet, sorghum, and buffelgrass. The analyzed variables were: stomatal conductance, transpiration rate, net photosynthesis rate, and internal CO2 concentration, besides the instantaneous water-use efficiency, intrinsic water-use efficiency, and instantaneous carboxylation efficiency. The use of soil mulch satisfactorily increased the photosynthetic rate of the forage cactus; this type of practice can aid in the productive development of the crop in semiarid zones, whereas the intercropping with buffelgrass and forage watermelon stimulated photosynthesis and the water-use efficiency.

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Section: Resultsmentioning

confidence: 76%

Gas exchanges and water-use efficiency of Nopalea cochenillifera intercropped under edaphic practices

et al. 2020

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“…At the time of fertilization in the V5 stadium of the plants, the values were higher than the fertilization at seeding, with a variation from 46.81 to 60.71 [(µmol m -2 s -1 ) / (mol m -2 s -1 )], in which the dose of 150 kg of K ha -1 provided the best results. These higher values that were elaborated by the United States, in the dose of 150 kg of K ha -1 in the two seasons of fertilization, becomes an indicative that with the increase of the liquid photosynthesis the stomatal conductance also increased, however, the reduction of the gs was greater than the reduction of A, supporting the occurrence of stomatal limitation (Bertolli et al, 2015).…”

Section: Gas Exchange -Maizementioning

confidence: 82%

Growth, Gas Exchanges and Maize Productivity Under Potassic Fertilizer Management and Residual Response on Bean

Ribeiro

Neto

Júnior

et al. 2019

JAS

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Potassium (K) is the second nutrient of greater absorption by plants, and it is of fundamental importance for the development of the cultures and acts in the activation of enzymes that participate in the photosynthetic processes. However, there are still doubts about its residual effect on crop succession. Therefore, the objective of the research was to evaluate the effect of K doses on growth, gas exchange and maize yield and its residual effect on bean culture. The experiment was a randomized complete block design, in a 5x2 factorial scheme, totaling 10 treatments, with five K doses (0, 50, 100, 150 and 200 kg ha -1 ) and two fertilization periods (seeding and V5 stadium) in maize plants. Growth parameters, gas exchange and yield were evaluated in maize plants, and growth was evaluated in Bean plants in an experimental area belonging to the Department of Plant Science and Environmental, Federal University of Paraí ba in Northeast Brazil. For the analysis of the data, we performed the analysis of variance, according to the design adopted. Subsequently, the data were submitted to regression analysis, with curve fitting, according to the parameters evaluated. Results revealed that, K fertilization influenced the growth of maize plants in the two fertilization periods (seeding and V5 stadium) at 45 and 75 days after planting, as well as in gas exchange and productivity. Fertilization at the V5 stadium in maize presented higher values compared to fertilization at seeding, in which the dose of 150 kg ha -1 presented the best results at both planting times. In relation to the residual effect of K on bean growth, it was verified that, there was influence of the doses on the growth of plants, in which the dose of 200 kg ha -1 recorded the highest values. The results showed that there is the residual response of K on bean cultivation in succession with maize. For the greater development of maize, it is recommended to use the dose of 150 kg ha -1 at the V5 stage of plants.

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“…In environments with a water deficit, maintaining the status of turgescence is essential for proper plant development, and in such a situation the regulation of photosynthesis is low (BERTOLLI et al, 2015). This reduction in photosynthetic efficiency is noticed when there is an imbalance between the energy captured by photosystems I and II and their biochemical conversion stage (BERTOLLI et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Em ambientes com déficit hídrico, a manutenção do status de turgescência é essencial para um desenvolvimento adequado da planta, sendo que nesta situação é observada baixa regulação da fotossíntese (BERTOLLI et al, 2015). A redução da eficiência fotossintética é percebida quando existe um desequilíbrio entre a energia capturada pelos fotossistemas I e II e sua fase de conversão bioquímica (BERTOLLI et al, 2012).…”

Section: Resultsunclassified

Photosynthetic characteristics in fig tree accessions for diversification of production

Ferreira

Rodrigues²,

Lisboa³

et al. 2019

AGRO@MBIENTE ON-LINE

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Photosynthesis allows plants, through metabolic reactions, to obtain products for their growth and development. Knowledge of and estimating the physiological variables involved in the photosynthetic process can be an advantage in choosing accessions for setting up an orchard. The aim of this study therefore was to evaluate some of the physiological characteristics involved in the photosynthetic process of six commercial accessions of the fig tree. The experiment was conducted in a completely randomised design, comprising six treatments and six replications, giving a total of 36 experimental units. The treatments consisted of the following fig accessions: ‘Roxo de Valinhos’, ‘Palestino’, ‘Figo Vermelho’, ‘PI 189’, ‘Cuello Negro’ and ‘Turco’. The net rate of CO2 assimilation, stomatal conductance, transpiration rate and internal leaf temperature varied statistically between accessions. Some accessions demonstrated the same performance as ‘Roxo de Valinhos’ for the photosynthetic variables. As such, the dependence of the domestic market on one single cultivar should be reviewed; however, further studies on other physiological and production characteristics should be carried out in order to validate each recommendation.

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Caracterização Fotossintética Da Espécie Isohídrica Pata-De-Elefante Em Condições De Deficiência Hídrica

Cited by 10 publications

References 27 publications

Gas exchanges and water-use efficiency of Nopalea cochenillifera intercropped under edaphic practices

Gas exchanges and water-use efficiency of Nopalea cochenillifera intercropped under edaphic practices

Growth, Gas Exchanges and Maize Productivity Under Potassic Fertilizer Management and Residual Response on Bean

Photosynthetic characteristics in fig tree accessions for diversification of production

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