Limitações Fotossintéticas em Folhas de Plantas de Tomateiro Submetidas a Crescentes Concentrações Salinas

Tatagiba, Sandro Dan; Moraes, Gustavo Adolfo Bevitori Kling de; Nascimento, Kelly Juliane Telles; Peloso, Anelisa Figueiredo

doi:10.13083/1414-3984.v22n02a05

Cited by 37 publications

(39 citation statements)

References 29 publications

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“…The damage to the photosynthetic apparatus occurs due to photo-oxidation of D1 proteins in the PSII, which are localized in the thylakoid membranes and show high sensitivity to oxygen reactive species, produced during the photochemical stage of photosynthesis (Biswall et al, 2011) which increase due to water deficit. This is proved by the reduction in Fm and the reduction in electron flux between the photosystems (Tatagiba et al, 2014) and confirmed by the decrease in Fv during the periods of increased water stress (1° P 0 and 2° P 0 ).…”

Section: Discussionmentioning

confidence: 62%

Potential for recovery of Campomanesia xanthocarpa Mart. ex O. berg seedlings from water deficit

Bento¹,

Scalon²,

Dresch³

et al. 2016

Afr. J. Agric. Res.

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The objective of this study is to evaluate the effect of water deficit and the recovery potential following rehydration, on the metabolism of Campomanesia xanthocarpa seedlings. The seedlings were distributed in two groups: the first group was the control, in which, plants were hydrated periodically in order to maintain 70% water holding capacity and the second was the treatment group characterized by stress, in which irrigation was suspended until the photosynthetic rate showed levels close to zero, at which point the plants were once again rehydrated with subsequent daily irrigation for one week, maintaining the water holding capacity at 70%. C. xanthocarpa shows a reduction in stomatal conductance and photosystem PSII efficiency. Water deficit decreases the water potential in the leaves and all the traits of the photosynthetic metabolism in C. xanthocarpa seedlings in twenty days of suspension of irrigation. These are later recovered with the re-establishment of the water supply. However, exposure of the seedlings to a second cycle of water deficit during the evaluation period demonstrated that the metabolism traits do not re-establish equilibrium.

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Section: Discussionmentioning

confidence: 62%

Potential for recovery of Campomanesia xanthocarpa Mart. ex O. berg seedlings from water deficit

Bento¹,

Scalon²,

Dresch³

et al. 2016

Afr. J. Agric. Res.

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“…Tal situação pode ter relação direta com o aumento no volume de água disponibilizado na maior lâmina, promovendo lixiviação de nutrientes em maiores quantidades, haja vista o maior volume de água quantificado na drenagem seguindo de maior condutividade elétrica da água (Tabela 1). Para Kerbauy (2008) (Taiz & Zeiger, 2009).…”

Section: Resultsunclassified

“…Deste modo, a EiC depende da disponibilidade de CO 2 no mesófilo foliar, quantidade de luz, temperatura e da atividade enzimática para que haja fotossíntese. Se as concentrações de CO 2 intercelulares são muito baixas, o influxo deste componente nas células do mesófilo é restringido; assim, a planta utiliza o CO 2 proveniente da respiração para manter um nível mínimo de taxa fotossintética, tornando-a limitada (Taiz & Zeiger, 2009).…”

Section: Resultsunclassified

Trocas gasosas e fluorescência da clorofila em plantas de berinjela sob lâminas de irrigação

Silva

Dutra

et al. 2015

Rev. bras. eng. agríc. ambient.

111

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R E S U M OA berinjela tem grande importância nutricional e socioeconômica, sendo cultivada e comercializada em vários países, principalmente em ambiente protegido; sua produção, assim como a de inúmeros cultivos agrícolas, é dependente de fatores como água, nutrientes e luz; propôs-se, assim, com este trabalho, avaliar as trocas gasosas, fluorescência da clorofila a e temperatura foliar de berinjela cultivada em ambiente protegido em diferentes lâminas de irrigação. O estudo foi realizado em casa de vegetação utilizando-se delineamento inteiramente casualizado, com 5 tratamentos e oito repetições, totalizando 40 unidades experimentais. Os tratamentos constaram de cinco lâminas de irrigação: 33, 66, 100, 133 e 166% da ETc, as quais corresponderam a 133, 266, 403, 536, 669 mm planta -1 ciclo -1 , respectivamente. A taxa fotossintética das plantas de berinjela aumenta com o acréscimo da reposição hídrica. Os valores mais expressivos de trocas gasosas (A, E, gs, Ci, EiUA e EiC) nas plantas de berinjela, de forma geral, foram observados quando se utilizaram, na irrigação, lâminas estimadas entre 123,52 e 166% da ETc. A fluorescência da clorofila aumentou com o aumento das lâminas de irrigação e a temperatura foliar diminuiu em função do aumento da água. Gas exchange and chlorophyll fluorescence of eggplant grown under different irrigation depths A B S T R A C TEggplant has a nutritional, social and economic importance in the world, being grown and marketed in several countries, normally in protected environment. Its production, as a lot of crops, is dependent on factors such as water, light and nutrients. Thus, it was proposed with this study to evaluate leaf gas exchange, chlorophyll fluorescence and leaf temperature in eggplant grown in greenhouse under different irrigations levels. The study was accomplished in a greenhouse, using a completely randomized experimental design with five treatments and eight replications, totaling 40 experimental units. The treatments were consisted of five irrigation depths: 33, 66, 100, 133 and 166% of ETc, which amounted to 133, 266, 403, 536, , respectively. Photosynthetic rate of eggplant increases with the addition of water depth. The higher values of gas exchange (A, E, gs, Ci, EiUA e EiC) in eggplants, in general, were observed in irrigation, water depths estimated between 123,52 and 166% ETc were used. The chlorophyll fluorescence increased with increasing water depths and leaf temperature decreased with the increase in water depth. Palavras-chave:Solanum melongena L. reposição hídrica fotossíntese eficiência fotoquímica

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“…This result is similar to that found in the present study, in which gs was also the variable most susceptible to the increase in salinity. Tatagiba et al (2014), studying the photosynthetic behavior of tomato plants subjected to four doses of salinity in the …”

Section: Methodsmentioning

confidence: 99%

Gas exchange and photosynthetic pigments in bell pepper irrigated with saline water

Melo

Souza

Duarte

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe tools that evaluate the salinity effects on plants have great relevance as they contribute to understanding of the mechanisms of tolerance. This study aimed to evaluate gas exchanges and the contents of photosynthetic pigments in bell peppers cultivated with saline solutions (0, 1, 3, 5, 7 and 9 dS m -1 ) prepared using two sources: NaCl and a mixture of Ca, Mg, K, Na and Cl salts, in randomized blocks with a 6 x 2 factorial scheme and 4 replicates, totaling 48 experimental plots. The net photosynthesis (A), stomatal conductance (gs), transpiration (E), internal CO 2 concentration (Ci), instantaneous carboxylation efficiency (A/Ci) and water use efficiency (WUE), besides chlorophyll a, b and carotenoids were evaluated. The gas exchange parameters were efficient to indicate the effects of salinity. All photosynthetic pigments decreased with increased electrical conductivity, and the chlorophyll a is the most sensitive to salinity, while the water use efficiency increased with the increment of electrical conductivity.Trocas gasosas e pigmentos fotossintéticos em pimentão irrigado com água salina R E S U M O As ferramentas que avaliam os efeitos da salinidade nos vegetais apresentam grande relevância uma vez que contribuem para compreender os mecanismos de tolerância. Objetivou-se avaliar as trocas gasosas e os teores dos pigmentos fotossintéticos em pimentão cultivado com água salina (0, 1, 3, 5, 7 e 9 dS m -1 ) elaboradas de duas formas: NaCl e uma mistura de sais de Ca, Mg, K, Na e Cl. O delineamento experimental foi em blocos ao acaso com arranjo fatorial 6 x 2, com 4 repetições totalizando 48 parcelas experimentais. Foram avaliadas a fotossíntese líquida (A), a condutância estomática (gs), a transpiração (E), a concentração interna de CO 2 (Ci), a eficiência instantânea de carboxilação (A/Ci) e a eficiência do uso da água (EUA) além da clorofila a, clorofila b e carotenoides. Os parâmetros de trocas gasosas foram eficientes para indicar os efeitos da salinidade. Todos os pigmentos fotossintéticos reduziram com o aumento da condutividade elétrica sendo a clorofila a de maior sensibilidade à salinidade enquanto a eficiência do uso da água aumentou com a elevação da condutividade elétrica. Key words:salt stress photosynthesis chlorophyll brazilian semi-arid region Palavras-chave: estresse salino fotossíntese clorofila semiárido brasileiro

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Limitações Fotossintéticas em Folhas de Plantas de Tomateiro Submetidas a Crescentes Concentrações Salinas

Cited by 37 publications

References 29 publications

Potential for recovery of Campomanesia xanthocarpa Mart. ex O. berg seedlings from water deficit

Potential for recovery of Campomanesia xanthocarpa Mart. ex O. berg seedlings from water deficit

Trocas gasosas e fluorescência da clorofila em plantas de berinjela sob lâminas de irrigação

Gas exchange and photosynthetic pigments in bell pepper irrigated with saline water

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