TROCAS GASOSAS E GRAU DE TOLERÂNCIA AO ESTRESSE HÍDRICO INDUZIDO EM PLANTAS JOVENS DE &lt;i&gt;Tabebuia aurea&lt;/i&gt; (PARATUDO) SUBMETIDAS A ALAGAMENTO

Oliveira, Ademir Kleber Morbeck de; Gualtieri, Sônia Cristina Juliano

doi:10.5902/1980509826457

Cited by 21 publications

(16 citation statements)

References 3 publications

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“…Excess of water was more harmful to photosynthesis, consequently limiting water use efficiency. Batista et al (2008) studying Cecropia pachystachya, and Oliveira & Gualtieri (2017), studying Tabebuia aurea, found reductions in stomatal conductance of plants subjected to flood, which also led to reduction in their photosynthetic activity, corroborating the result observed in the present study. Although the period of saturation in our experiment was short, because of the drainage system, it was sufficient to reduce the photosynthetic activity of A. squamosa plants, but it did not affect carboxylation efficiency, indicating that this stress was not able to cause more severe alterations, for instance on the supply of ATP and NADPH to the functioning of the enzyme Ribulose-1,5-bisphosphate carboxylase/oxygenase (MACHADO et al, 2010;SÁ et al, 2017).…”

Section: Resultssupporting

confidence: 89%

Growth and physiology of Annona squamosa L. under different irrigation depths and phosphate fertilization

Moreira¹,

Brito²,

Fernandes³

et al. 2019

Biosci. J.

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This study aimed to evaluate the growth and physiology of Annona squamosa seedlings under increasing irrigation depths and phosphorus doses. The experiment was conducted in protected environment, evaluating five irrigation depths and four P 2 O 5 doses, arranged in 5 x 4 factorial scheme, in randomized blocks, with four replicates and one plant per plot. Treatments were irrigation depths of 60, 80, 100, 120 and 140% of the real evapotranspiration of the seedlings -ETr and phosphorus doses of 0, 350, 700 and 1050 mg dm -3 of P 2 O 5 -. Plants were evaluated at 120 days after transplanting with respect to growth, gas exchanges, leaf water potential and total dry matter accumulation. Phosphorus dose of 350 mg dm -3 promotes satisfactory dry matter accumulation for A. squamosa seedlings, especially under 100% ETr irrigation. Leaf water potential and gas exchanges of A. squamosa are affected by water stress, through both lack and excess of water. Stomatal conductance is the variable most sensitive to the lack of water, whereas photosynthesis and water use efficiency are the most sensitive to the excess of water. Irrigation depth of 100% ETr is ideal to produce A. squamosa seedlings, but the irrigation depth of 80% ETr can be used to produce these seedlings, disregarding small losses of growth.

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Section: Resultssupporting

confidence: 89%

Growth and physiology of Annona squamosa L. under different irrigation depths and phosphate fertilization

Moreira¹,

Brito²,

Fernandes³

et al. 2019

Biosci. J.

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“…Thus, metabolic processes are directed towards the synthesis of highly reduced compounds such as isoprenoids, phenols and alkaloids with the use of these accumulated reducing agents [62]. In this context, although there were no significant differences in stomatal conductance in A. crassiflora, reductions in CO 2 assimilation rates (A net ) were observed due to water restriction (drought) and flooding, which corroborates the results of Simonneau et al [63] and Oliveira and Gualtieri [64], respectively, and may have led to lower CO 2 fixation in the Calvin cycle [65]. However, only A. crassiflora plants kept under drought conditions showed greater synthesis of total alkaloids in relation to those kept under field capacity, in addition to having higher carboxylation efficiency (A net /Ci) and higher liriodenine concentration in relation to flooded plants, which indicates that these responses were evident when plants were under water restriction.…”

Section: Discussionsupporting

confidence: 83%

Impact of Drought and Flooding on Alkaloid Production in Annona crassiflora Mart

et al. 2021

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The Brazilian Cerrado is the second largest Brazilian biome. In recent decades, a reduction in rainfall has indicated an extension of the dry season. Among the many native species of the Cerrado of the Annonaceae family and used in folk medicine, Annona crassiflora Mart. has fruits of high nutritional value and its by-products are sources of bioactive compounds, such as alkaloids. The aim of the study was to investigate how water stress impacts the production of alkaloids. The study was carried out in a nursery, and the knowledge was flood, field capacity and drought. Gas exchange, chlorophyll a fluorescence, antioxidant enzymes, total soluble sugars, starch, reducing sugars, sucrose, total alkaloids and liriodenine were analyzed. We observed that plants subjected to drought had an increase in the production of total alkaloids and liriodenine, without a reduction in photosynthetic metabolism. Plants kept under drought and flood conditions dissipated higher peroxidase activity, while catalase was higher in flooded plants. Starch showed the highest concentration in flooding plants without differing from drought plants; the lowest trehalose concentrations were found in both drought and flooding plants. The drought stimulated the synthesis of total alkaloids and liriodenine without reducing the primary metabolism, which suggests adaptation to Cerrado conditions.

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“…The results obtained in this work can be compared with other crops, that relate to water deficit and excess for ornamental crops (Schwab et al, 2013;Girardi et al,2016;Oliveira & Gualtieri, 2017;Menegaes et al, 2019;Soares et al, 2019),…”

Section: Accumulated Evapotranspiration and Number Of Stems Producedmentioning

confidence: 91%

Crop coefficient of cut gerbera with water supplementation in a protected environment

Piroli

Peiter

Robaina

et al. 2020

Agraria

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The determination of the crop coefficient (Kc) is vital since, although gerbera cultivation is constantly expanding, there is little research on the evapotranspiration of the crop cultivated under a protected environment to obtain the correct irrigation management. The objective of this work was to evaluate the evapotranspiration and crop coefficients of cut gerbera, cultivated in protected environment. The reference evapotranspiration (ETo) and crop evapotranspiration (ETc) were obtained through the Penman and weighing lysimetry methods, respectively. The experimental design used was completely randomized, consisting of five irrigation treatments (120, 100, 80, 60, and 40% of the water retention capacity), with ten replicates each, totalizing 50 experimental units. The Kc was evaluated using the irrigation lamina that presented the highest production of floral stems among the tested treatments, obtained through the relation between ETc and ETo. The mean of the crop coefficient ranged from 0.72 in vegetative period I, 0.81 in vegetative period II, 0.85 in flowering I, 0.89 in full flowering II, 1.33 in full flowering III, and 1.06 in end of the flowering I. The water consumption for the cut gerbera crop in the treatments with water availability ranged from 225.87 to 523.58 mm. Therefore, the crop coefficients proposed for the different phenological stages of the gerbera were efficient for irrigation management.

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TROCAS GASOSAS E GRAU DE TOLERÂNCIA AO ESTRESSE HÍDRICO INDUZIDO EM PLANTAS JOVENS DE <i>Tabebuia aurea</i> (PARATUDO) SUBMETIDAS A ALAGAMENTO

Cited by 21 publications

References 3 publications

Growth and physiology of Annona squamosa L. under different irrigation depths and phosphate fertilization

Growth and physiology of Annona squamosa L. under different irrigation depths and phosphate fertilization

Impact of Drought and Flooding on Alkaloid Production in Annona crassiflora Mart

Crop coefficient of cut gerbera with water supplementation in a protected environment

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