PHYSIOLOGICAL RELATIONSHIPS IN Aleurites fordii Hemsl. SEEDLINGS

Caron, Bráulio Otomar; Schneider, Julia Renata; Elli, Elvis Felipe; Eloy, Élder; Souza, Velci Queiróz de

doi:10.1590/1806-90882017000100002

Cited by 5 publications

(5 citation statements)

References 16 publications

(16 reference statements)

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“…Regarding the internal and external environmental variables during the day, previous works found similar results to the present study, observing maximum photosynthetically active radiation from 11 am to 1 pm, and maximum air temperature from 1 pm to 3 pm [23,24,25]. Such an increase in PAR and air temperature possibly decreased air relative humidity throughout the day, in the hottest hours (11 am to 1 pm) [26].…”

Section: Discussionsupporting

confidence: 89%

Climatic Variation on Gas Exchange and Chlorophyll a Fluorescence in Tabebuia roseoalba and Handroanthus heptaphyllus (Bignoniaceae)

Ribeiro

Coêlho

Souza

et al. 2022

Braz. arch. biol. technol.

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Climatic variation throughout the day influences the ecophysiological performance of plants at different growth stages and phases. Therefore, this work aimed to evaluate the effect of climatic variation on ecophysiological aspects of T. roseoalba and H. heptaphyllus at different hours of the day and indicate the ideal time for measuring ecophysiological variables in these species. The research was carried out in a greenhouse at the forest nursery of the Federal University of Paraíba, Campus II, in the municipality of Areia, Paraíba state, Northeastern Brazil. The experimental design was completely randomized, consisting of 10 evaluation times throughout the day (from 8 am to 5 pm), with 1 h hour interval between each evaluation. Temperature and air relative humidity inside and outside the greenhouse were evaluated to understand the effect on gas exchange (net assimilation rate of CO2, stomatal conductance, transpiration rate, internal concentration of CO2, and vapor-pressure deficit) and chlorophyll a fluorescence (initial, maximum, and variable fluorescence, photochemical quenching, and electron transport rate). Data were submitted to canonical correlation analysis and principal component analysis to verify the relationship between climatic HIGHLIGHTS• Climatic conditions influence the physiological mechanisms of species.• High irradiance and air temperature reduce photosynthetic performance of species.• The highest physiological performance of the species is between 8 am and 9 am.

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Section: Discussionsupporting

confidence: 89%

Climatic Variation on Gas Exchange and Chlorophyll a Fluorescence in Tabebuia roseoalba and Handroanthus heptaphyllus (Bignoniaceae)

Ribeiro

Coêlho

Souza

et al. 2022

Braz. arch. biol. technol.

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“…Taiz et al (2017) state that plants transpiration reduces as the solar radiation diminishes throughout the day, due to lower ambient and leaf temperature. Caron et al (2017) observed similar behavior in Aleurites fordii plants, which presented an inversely proportional relationship between its transpiration rates and stomatal resistance, substantiating diminished transpiration rates with stomatal closure. The vapor pressure deficit (VPD), instantaneous carboxylation efficiency (iCE), water-use efficiency (WUE) and intrinsic water-use efficiency (iWUE), also presented quadratic response to the different assessment times (Fig 6).…”

Section: Gas Exchangesupporting

confidence: 62%

Gas exchanges in sugar apple (Annona squamosa L.) subjected to salinity stress and nitrogen fertilization

et al. 2019

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Salinity is one of the modern agriculture major obstacles, causing several physiological disturbances in plants, adversely affecting its growth and development. Therefore, some techniques are required in order to alleviate the negative effects of salinity stress on plants, as for example an adequate nitrogen fertilization. The aim of this study was to assess the ecophysiological responses of sugar apple plants (Annona squamosa L.) submitted to different salinity levels and nitrogen fertilization doses. The experimental design was a randomized block in an incomplete factorial scheme, with five electrical conductivities of the irrigation water (ECw: 0.5, 1.01, 2.25, 3.49 and 4.0 dS m-1) and five nitrogen doses (0, 101, 350, 598.2 and 700 mg dm-3), with four replicates, generated from the Box Central Composite experimental design matrix. Through a daily course, it was observed variations in gas exchange, chlorophyll content and fluorescence parameters. The gas exchange, chlorophyll content and fluorescence parameters were measured on photosynthetically active leaves. There was significant interaction between the salinity levels (ECw) and nitrogen doses for the chlorophyll indexes. The electrical conductivity of the irrigation water caused significant negative effects on chlorophyll fluorescence. Therefore, it can be stated that the sugar apple plants ecophysiology varies through the day and that salinity affects its chlorophyll content and fluorescence.

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“…The closure of stomata at the end of the afternoon may happen due to the strategy of the plants to maintain the turgescence of the leaves during the respiratory period Lopes 2007, Taiz et al 2017). In Aleurites fordii plants, Caron et al (2017) observed similar behavior in the transpiration curves, in which the transpiratory rate decreased with the stomatal closure.…”

Section: Discussionmentioning

confidence: 53%

Environmental factors variation in physiological aspects of Erythroxylum pauferrense

et al. 2020

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Ecophysiological studies are highly important to seek understanding of the plant-environment relationship. The objective of this work was to evaluate the influence of environmental factors on physiological aspects in young plants of Erythroxylum pauferrense throughout the day. A completely randomized design with 10 treatments and 4 replicates was used. Treatments were at different evaluation times throughout the day (8:00 h-17:00 h) with a 60-minute interval between them. The physiological variables evaluated were: photosynthesis rate, internal CO 2 concentration, transpiration, stomatal conductance, vapor pressure deficit, instantaneous water use efficiency, intrinsic water use efficiency, instantaneous carboxylation efficiency and leaf temperature. Internal and external temperature, relative humidity of the internal and external air of the greenhouse and photosynthetically active radiation were measured as climatic variables. The climatic variables presented correlations with the physiological parameters, with a strong association between photosynthetically active radiation and internal and external temperature of the greenhouse with the rate of photosynthesis, vapor pressure deficit, leaf temperature, transpiration, intrinsic efficiency of the use of water, stomatal conductance and instant water use efficiency. The influence of climatic factors on the physiological aspects in plants of E. pauferrense can be observed. The most suitable period of the day for conducting the physiological evaluations in species is between 11:00 h and 13:00 h.

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PHYSIOLOGICAL RELATIONSHIPS IN Aleurites fordii Hemsl. SEEDLINGS

Cited by 5 publications

References 16 publications

Climatic Variation on Gas Exchange and Chlorophyll a Fluorescence in Tabebuia roseoalba and Handroanthus heptaphyllus (Bignoniaceae)

Climatic Variation on Gas Exchange and Chlorophyll a Fluorescence in Tabebuia roseoalba and Handroanthus heptaphyllus (Bignoniaceae)

Gas exchanges in sugar apple (Annona squamosa L.) subjected to salinity stress and nitrogen fertilization

Environmental factors variation in physiological aspects of Erythroxylum pauferrense

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