Resposta estomática e produção de matéria seca em plantas jovens de aroeira submetidas a diferentes regimes hídricos

Silva, Maria Alice Vasconcelos da; Nogueira, Rejane Jurema Mansur Custódio; Oliveira, Antônio Fernando Morais de; Santos, Venézio Felipe dos

doi:10.1590/s0100-67622008000200016

Cited by 18 publications

(19 citation statements)

References 8 publications

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“…Galmés et al (2007) investigated eight Mediterranean species subjected to water stress, and also reported a decrease in conductance by increasing the hydric failure, with a recovery of conductance rates after rehydration. This result was similar to that one reported by Silva et al (2008) with Schinus terebinthifolius Raddi. According to Larcher (2010) and Akınci and Lösel (2012), some species can exhibit slow recovery of stomatal conductance due to the buildup of abscisic acid (ABA) during water stress with the recovery times varying according to the species.…”

Section: Stomatal Conductancesupporting

confidence: 93%

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Gas exchange in young plants of the species Tabebuia aurea exposed to conditions of induced water stress

Oliveira¹,

Gualtieri²

2017

Biosci. J.

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ABSTRACT:The paratudo, Tabebuia aurea, is a common Brazilian tree from the Pantanal wetland from Miranda, Mato Grosso do Sul, an area with hydric seasonality. To evaluate the effects of water stress on CO 2 exchange, ten-month-old T. aurea seedlings cultivated in planting bags were subjected to water stress by suppressing irrigation for 23 days. Stomatal conductance, transpiration rate, and photosynthetic rate were measured during the stress and recovery period, totaling 28 days, using an infrared portable analyzer. After 23 days without irrigation, the transpiration, stomatal conductance, and net photosynthesis rates in leaflets were zero, while the leaflets water potential reached -2.6 MPa. After this point, daily irrigation was resumed, and the values of the measured variables recovered to the initial levels after 96 hours (transpiration rate from 2.0 to 2.6 mmol m -2 s -1 ; stomatal conductance rate from 0.12 to 0.18 mol m -2 s -1 and photosynthesis rate from 8.1 to 9.5 µmol m -2 s -1 ). Furthermore, the hydric potential values were similar to those observed at the beginning of the experiment (-0.5 MPa). The results showed that T. aurea has tolerance to drought, allowing their survival in areas subjected to periodic water stress.

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Section: Stomatal Conductancesupporting

confidence: 93%

“…As reported by Tatagiba et al (2007), it was observed a decrease in transpiration rates during drought periods and an increase during rainy periods for Eucaliptus clones, while Silva et al (2008) have reported a similar pattern for S.…”

Section: Transpiration Ratessupporting

confidence: 65%

Gas exchange in young plants of the species Tabebuia aurea exposed to conditions of induced water stress

Oliveira¹,

Gualtieri²

2017

Biosci. J.

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“…According to Silva et al (2008), water deficiency conditions are capable of affecting the stomatal apparatus by causing the stomata to close. In this same context, Yordanov et al (2003) state that in a water deficit condition, the first defense adopted by the plant would be the restriction of the stomatal opening.…”

Section: Discussionmentioning

confidence: 99%

PHYSIOLOGICAL RELATIONSHIPS IN Aleurites fordii Hemsl. SEEDLINGS

et al. 2017

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-The objective of this work was to evaluate the physiological behavior at different times of the day and the level of dependence between physiological variables and meteorological elements in Aleurites fordii seedlings. The experiment was conducted in a greenhouse, using a completely randomized experimental design, in a uniform scheme composed of 10 evaluation times (from 8 am to 5 pm, with an interval of 1h between evaluations) and three replications. Each replicate consisted of three evaluation plants, totaling nine seedlings, which were arranged on a double border. The following characteristics were evaluated: leaf temperature (°C), photosynthetically active solar radiation (mol S -1 m -2 ), stomatal resistance (S cm -1 ), and transpiration (mmol H 2 O s -1 m -2 ) over a typical day, using a LI-1600 LI-COR digital porometer. The temperature and relative humidity were measured inside the greenhouse, using a thermohygrograph. The evaluations were performed at 244 days after sowing, between 8:00 and 17:00, with an interval of 60 minutes, totaling 10 evaluations. The physiological changes of Aleurites fordii seedlings are affected by the time of day. In general, the physiological variables are highly dependent on meteorological elements. The temperature of the greenhouse and the relative humidity are the meteorological elements that most influence the physiological behavior of Aleurites fordii seedlings.Keywords: Transpiration; Stomata; Photosynthetically active solar radiation. RELAÇÕES FISIOLÓGICAS EM MUDAS DE Aleurites fordii Hemsl.RESUMO -O trabalho teve como objetivo avaliar o comportamento fisiológico em diferentes horários do dia e o nível de dependência entre variáveis fisiológicas e elementos meteorológicos em mudas de Aleurites fordii. O experimento foi conduzido em casa de vegetação, utilizando-se delineamento experimental inteiramente casualizado, em esquema unifatorial composto por 10 horários de avaliação (das 8 às 17h, com intervalo de 1h entre as avaliações) e três repetições. Cada repetição era constituída por três plantas de avaliação, totalizando nove mudas, as quais estavam dispostas sobre bordadura dupla. Foram avaliadas as características: temperatura da folha (°C), radiação solar fotossinteticamente ativa (ìmol S -1 m -2 ), resistência estomática (S cm -1 ) e transpiração (mmol H 2 O s -1 m -2 ) ao longo de um dia típico, com uso de um porômetro digital LI-1600 LI-COR. As medidas da temperatura e umidade relativa do ar foram determinadas dentro do ambiente protegido, utilizando-se um termohigrógrafo. As avaliações foram realizadas aos 244 dias após a semeadura, entre 8:00 e 17:00h, com intervalo de 60 minutos, totalizando 10 avaliações. O comportamento fisiológico das mudas de Aleurites fordii é afetado pelo horário do dia. De modo geral, as variáveis fisiológicas estudadas são altamente dependentes dos elementos meteorológicos. A temperatura do ambiente protegido e a umidade relativa do ar são os elementos meteorológicos que mais influenciam o comportamento fisiológico das mudas ...

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“…Then, it can be noticed a significant reduction for this variable when the plants were under the effects of water stress at 40% of the MWHC (reduction of 52% compared to the control treatment). Silva et al (2008) reported that for the production of dry matter in young plants of 'aroeira' (Schinus terebinthifolius Raddi) there was no significant difference among the treatments for the allocation of biomass to the leaf (BAL), stems (BAS), and roots (BAR). In neem plants (Azadirachta indica A. Juss), Martins et al (2010) found that for the control 100%, 80%, and 60% of the MWHC, the biomass allocation to the leaves at the end of the experiment was the highest, being 38.9, 40.1, and 43.7%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Morpho-physiological analyses of Allamanda blanchetii A. DC. seedlings under water deficit

Alves¹,

Albuquerque²,

Pereira³

et al. 2017

Biosci. J.

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ABSTRACT:The Allamanda blanchetii belongs to the Apocynaceae family, being an ornamental species popularly known as allamanda-roxa and is endemic to the Caatinga. The aim of this research was to evaluate the growth, gas exchange, relative water content, and stomatal density of A. blanchetii under water stress conditions. The experimental design was completely randomized with six levels of the maximum water holding capacity (MWHC) (100%, 80%, 60%, 40%, and 20%) with eight replications. Weekly, it was performed the evaluations of plant height and number of leaves. The results for water stress treatment in the A. blanchetii plants show that they develop better in the water levels of 100% and 80% of the MWHC, without presenting significant morphological and physiological changes. In turn, 20% of the MWHC does not allow the survival of the A. blanchetii plants. The water restriction negatively interfered in the gas exchange in the treatment of 60% and 40% of the MWHC. Therefore, it can be concluded that the A. blanchetii plants grow satisfactorily in 100% and 80% of the MWHC, ensuring the growth and survival during the drought period. The water availability to which the plants were submitted does not influence the total chlorophyll and relative water content of leaves. Gas exchanges are adversely affected at levels of water availability below 80% of the MWHC.

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Resposta estomática e produção de matéria seca em plantas jovens de aroeira submetidas a diferentes regimes hídricos

Cited by 18 publications

References 8 publications

Gas exchange in young plants of the species Tabebuia aurea exposed to conditions of induced water stress

Gas exchange in young plants of the species Tabebuia aurea exposed to conditions of induced water stress

PHYSIOLOGICAL RELATIONSHIPS IN Aleurites fordii Hemsl. SEEDLINGS

Morpho-physiological analyses of Allamanda blanchetii A. DC. seedlings under water deficit

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