Respostas ecofisiológicas de cafeeiros submetidos ao deficit hídrico para concentração da florada no Cerrado de Minas Gerais

Ronchi, Cláudio Pagotto; Araújo, Fernando Couto de; Almeida, Wellington Luiz de; Silva, Max Afonso Alves da; Magalhães, Carlos Eduardo de Oliveira; Oliveira, Leandro Barbosa de; Drumond, Luís César Dias

doi:10.1590/s0100-204x2015000100003

Cited by 19 publications

(11 citation statements)

References 14 publications

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“…The observed reduction in leaf water potential may be related to the sugars accumulation in leaves, which together with other physiological mechanisms, such as stomatal closure and reduced transpiration, contribute to the maintenance of tissue hydration. Other species also showed reduced water potential when under conditions of low water availability (Ronchi et al, 2015, Mota & Cano, 2016.…”

Section: Plant Water Relationsmentioning

confidence: 99%

Physiological Responses of Physalis angulata Plants to Water Deficit

Leite¹,

Nascimento²,

Tanan³

et al. 2018

JAS

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It’s known that drought affects crop growth, however, little is known about the physiological responses developed under these conditions by underexploited species, such as Physalis angulata. This study aimed at assessing the physiological responses of Physalis angulata plants after 40 days under different water availability (100%, 80%, 60%, 40% and 20% of pot field capacity). In this research, the effects of the water deficit on the relative water content, water potential, gas exchange, sugars accumulation and activity of nitrate reductase were evaluated. Water relations were affected mainly in plants under severe water deficit, however, the variables remained stable when cultivated at sub-optimal levels of field capacity. Gas exchanges were also affected by water deficit, with reduction in carbon assimilation, internal carbon, stomatal conductance and transpiration, as well as increased leaf temperature and water use efficiency. Plants accumulated sugars as a mechanism of tolerance to severe water deficit, while nitrate reductase activity was reduced. P. angulata plants develop important strategies to tolerate water deficit, contributing to the establishment of crops under low water availability.

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Section: Plant Water Relationsmentioning

confidence: 99%

Physiological Responses of Physalis angulata Plants to Water Deficit

Leite¹,

Nascimento²,

Tanan³

et al. 2018

JAS

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“…At 90 days, the values were -0.2 and -1.8 MPa for treatments irrigated permanently and not irrigated. Ronchi et al (2015) found values of leaf water potential in the Catuaí Red IAC 144 cultivar of -0.10, -0.35, -0.5 and -0.6 MPa for treatments irrigated continuously, 30 days of irrigation suspension, 60 days of irrigation suspension and non-irrigated, respectively. The results found by these authors diverge, in parts, from the values estimated by the equation of the suggested line, however, the edaphoclimatic conditions and the crop management in each study affect the rate of water use by the plants, thus altering their water potential.…”

Section: Resultsmentioning

confidence: 88%

“…Several studies have verified that there is a dependence between the leaf water potential of the coffee tree and the soil matrix potential in different irrigation managements, however, the water potential levels found are divergent because they work in distinct and uncontrolled environments (Soares et al, 2005;Oliveira et al, 2009;Ronchi et al, 2015;Craparo et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Physiological Responses of Coffee Tree Under Different Irrigation Levels

et al. 2018

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The plant water potential and the leaf temperature are physiological responses of the coffee tree that can be used as indicative of the irrigation management of this crop. There is a dependence between the leaf water potential with the potential matrix of the soil solution, however, the water potential levels found for the coffee tree show divergent relationships in the literature regarding the matrix potential. The objective of this study is to verify the water potential and leaf surface temperature in the coffee tree when submitted to different irrigation levels. The study was conducted in Piracicaba, SP, Brazil, using Coffea arabica species from Red Catuaí IAC 144 variety, the drip irrigation system was adopted and the management done by tensiometry. The relationships among these physiological responses and the treatments of actions presented high determination coefficients (R² of 0.84, 0.90 and 0.65 for the leaf water potential, leaf temperature measured with the portable infrared sensor and the thermal camera respectively). The estimated values for leaf water potential were-0.23,-0.56,-0.89 and-1.22 MPa for irrigation treatments L130%, L100%, L70% and L40%, respectively. The calculated leaf temperature values were 31.7, 32.4, 33.0 and 33.7°C in average, for treatments L130%, L100%, L70% and L40% in proper order.

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“…We assume that these alterations in gas exchange levels may have occurred by two paths. The first would be related to a possible reduction of the source and drain relationship in the plant, derived from the potential that IAA has in increasing the root surface of plants (Taiz et al, 2017), this development in the root system would provide an increase in the potential for water and nutrient absorption, which consequently could be associated with lower water and nutritional stresses by plants, which could provide an increase in gas exchanges (Ronchi et al, 2015;Taiz et al, 2017;Tatagiba et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Effect of indole-3-acetic acid on growth, physiology and nutritional status of young arabica coffee plants

Erlacher

Amaral

et al. 2023

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Coffee is one of the main agricultural commodities in the world. Thus, research aimed at reducing the productive risks of the crop has been increasingly encouraged, among which the use of plant hormones stands out. In addition, the objective of this work was to analyze the effect of the application of indole-3-acetic acid on the growth, nutrition and gas exchange of young Coffea arabica L plants. The experiment was carried out in the field in the city of Alegre, Espírito Santo, Brazil. The experimental design used was randomized blocks, testing the effect of the application of five doses of indole-3-acetic acid in young Arabica coffee plants, in four replications. The application of indole-3-acetic acid stimulates the growth rate of the stem diameter at a concentration of 60 mg L -1 , as well as gas exchange in coffee plants, however it did not favor the increase in the substomatic concentration of CO2 instantaneous and intrinsic efficiency in water use and instantaneous carboxylation efficiency. Although the application of EIA was not able to provide direct gains in coffee growth during the experimental period, a longer evaluation of the treatments would possibly provide promising results for the coffee crop. The multivariate analysis showed that higher doses of auxin have a high relationship with the macronutrients studied.

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Respostas ecofisiológicas de cafeeiros submetidos ao deficit hídrico para concentração da florada no Cerrado de Minas Gerais

Cited by 19 publications

References 14 publications

Physiological Responses of Physalis angulata Plants to Water Deficit

Physiological Responses of Physalis angulata Plants to Water Deficit

Physiological Responses of Coffee Tree Under Different Irrigation Levels

Effect of indole-3-acetic acid on growth, physiology and nutritional status of young arabica coffee plants

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