Fisiologia e metabolismo foliar em duas variedades de videira sujeitas a um ciclo de défice hídrico e reidratação

Cerqueira, Reginaldo Conceição; Costa, J.M.; Chaves, M. M.; Rodrigues, João Domingos

doi:10.5039/agraria.v10i2a5045

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…This reduction can be attributed mainly to the lower water absorption by beet plants, thus an alternative to reduce the rate of transpiration is the closure of stomata. However, the closure of stomata also reduces the photosynthetic rate due to the lower availability of CO 2 (Pereira et al, 2013;Ghobadi et al, 2013;Cerqueira et al, 2015), causing the reduction in the growth and development of the plants, corroborating the data obtained in the present work. As for the rate of net photosynthesis, it was observed that there were differences between the two evaluation periods in the evaluated ECw.…”

Section: Resultssupporting

confidence: 90%

Physiological responses of beet plants irrigated with saline water and silicon application

Filho¹,

Silva²,

Gonçalves³

et al. 2020

Com. Sci.

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Although not considered an essential element, silicon can be used to increase crop productivity, especially under stress conditions. In this sense, the objective was to evaluate the gas exchange of beet plants irrigated with saline water depending on the application of silicon. The experiment was conducted in a randomized block design, in a 5 x 5 factorial, referring to five levels of electrical conductivity of irrigation water (ECw): (0.5; 1.3; 3.25; 5.2 and 6.0 dS m-1) and five doses of silicon (0.00; 2.64; 9.08; 15.52 and 18.16 mL L-1), with six beet plants as an experimental unit. The effect of treatments on beet culture was evaluated at 30 and 60 days after irrigation with saline water from measurements of internal carbon concentration, stomatal conductance, net photosynthesis rate, instantaneous water use efficiency and instantaneous carboxylation efficiency using the LCpro+Sistem infrared gas analyzer (IRGA). Irrigation with saline water reduced the gas exchange of beet plants at 60 days after irrigation, but at 30 days after irrigation, the use of saline water increased stomatal conductance, transpiration rate and internal carbon concentration. The application of silicon decreased stomatal conductance, internal carbon concentration and efficiency in the use of water, but increased the rate of net photosynthesis, the rate of transpiration and instantaneous efficiency of carboxylation at 30 and 60 days after irrigation.

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Section: Resultssupporting

confidence: 90%

Physiological responses of beet plants irrigated with saline water and silicon application

Filho¹,

Silva²,

Gonçalves³

et al. 2020

Com. Sci.

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“…In this way, this process may cause the transfer of electrons from the reduced ferredoxin in photosystem I to O 2 , and, consequently, increase the production of ROS, promoting oxidative stress and damage to the plant (Ghobadi et al, 2013;Cerqueira et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Plant Growth, Antioxidative Enzymes, Lipid Peroxidation and Organic Solute Contents in Mulungu Seedlings (Erythrina velutina) Under Different Field Capacities

Martins¹,

Brito²,

Arruda³

et al. 2018

JAS

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Erythrina velutina (mulungu) is an endemic species of caatinga found in Northeast Brazil. As a result of its rapid plant growth, the species may be an alternative for the recovery of degraded areas. Thus, the present study aimed to analyze the effects of irrigation with different field capacilities (FC): 20, 50 and 80% on plant growth, antioxidative enzyme activities, membrane lipid peroxidation and organic solute contents in mulungu seedlings under greenhouse conditions. The experiment was carried out at Instituto Federal Educação, Ciência e Tecnologia do Ceará (IFCE)-Campus Maracanaú, Ceará, Brazil. Under the presented experimental conditions, E. velutina plants showed higher growth variables (dry matter yield and leaf area) when submitted to daily irrigation of 50% of FC. Irrigation at 20% of FC caused a small water deficit. However, 80% of FC watering may have resulted in an excess of water. In general, despite the reduction in plant growth in plants irrigated at 20% of FC, the activities of the antioxidant enzymes did not differ substantially between treatments. In general, the lowest organic solute contents were detected in irrigations at 20 or 80% of FC.

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“…A baixa concentração de CO 2 na etapa bioquímica da fotossíntese reduz a oxidação de NADPH no ciclo de Calvin-Benson, e, consequentemente, sua disponibilidade sob a forma de NADP + na etapa fotoquímica. Assim, este processo poderá resultar na transferência de elétrons da ferredoxina reduzida no fotossistema I ao O 2, e aumentar a produção de espécies reativas de oxigênio ROS (do inglês Reactive Oxigen Species), com danos ao aparato fotossintético e estresse oxidativo (Pereira et al, 2012;Ghobadi et al, 2013;Cerqueira et al, 2015).…”

Section: Introductionunclassified

Crescimento foliar e atividades das enzimas antioxidativas em plântulas de girassol suplementadas com percolado de aterro sanitário e submetidas a estresse hídrico

Nunes¹,

Gondim²,

Freitas³

et al. 2017

Rev. ambiente água

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Crescimento foliar e atividades das enzimas antioxidativas em plântulas de girassol suplementadas com percolado de aterro sanitário e submetidas a estresse hídrico RESUMOEm regiões áridas ou semiáridas, a escassez hídrica tem sido um dos principais fatores limitantes da produção agrícola. Diante disso, o presente trabalho objetivou analisar os efeitos da aplicação de percolado de aterro sanitário no crescimento foliar (número de folhas e área foliar) e as atividades das enzimas antioxidativas: superóxido dismutase (SOD), catalase (CAT), peroxidase do ascorbato (APX) e peroxidase do guaiacol (GPX) em folhas e raízes de plântulas de girassol submetidas às condições de estresse hídrico. O delineamento experimental foi o inteiramente casualizado, disposto em arranjo fatorial dois (irrigadas ou não irrigadas) x quatro (areia; areia + adubo orgânico 100 kg N ha -1 ; areia + percolado de aterro sanitário 100 kg N ha -1 ; areia + percolado de aterro sanitário 150 kg N ha -1 ), com cinco repetições. Em relação aos parâmetros foliares, o tratamento 100 kg N ha -1 suplementado com percolado de aterro sanitário obteve os melhores incrementos no número de folhas e área foliar. Além disso, verificaram-se aumentos nas atividades das enzimas antioxidativas em folhas e raízes de plântulas de girassol suplementadas com percolado de aterro sanitário, sendo provável que as reduções dos efeitos deletérios do estresse hídrico nas variáveis foliares dos tratamentos suplementados com percolado de aterro sanitário tenham ocorrido em virtude das maiores atividades das enzimas antioxidativas, especialmente as da CAT nas folhas e GPX nas raízes. Rev. Ambient. Água vol. 12 n.

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Fisiologia e metabolismo foliar em duas variedades de videira sujeitas a um ciclo de défice hídrico e reidratação

Cited by 6 publications

References 22 publications

Physiological responses of beet plants irrigated with saline water and silicon application

Physiological responses of beet plants irrigated with saline water and silicon application

Plant Growth, Antioxidative Enzymes, Lipid Peroxidation and Organic Solute Contents in Mulungu Seedlings (Erythrina velutina) Under Different Field Capacities

Crescimento foliar e atividades das enzimas antioxidativas em plântulas de girassol suplementadas com percolado de aterro sanitário e submetidas a estresse hídrico

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