Crescimento radicular e pigmentos clorofilianos em duas forrageiras submetidas a níveis crescentes de NaCl

Rhein, Andressa Freitas de Lima; Cruz, Flávio José Rodrigues; Ferraz, Rener Luciano de Souza; Santos, Durvalina Maria Mathias dos

doi:10.15361/1984-5529.2015v43n4p330-335

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…Plants under salt stress initially show reductions in stomatal conductance, photosynthetic rate and in the biosynthesis of chlorophyll (Rhein et al, 2015), besides changes in water use efficiency and water status of the plant, leading to the inhibition of growth (Flowers & Colmer, 2008;Santos et al, 2013).…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…Thus, it is verified that H 2 O 2 concentrations from 20, 40 and 60 μM mitigate the effect of salt stress on plants irrigated with water of sodic nature. The decrease in chlorophyll b synthesis in plants irrigated with water composed of Ca 2+ may be a strategy of protection and/or acclimatization in which the reduction in energy expenditure, carbon skeletons and nutrients necessary for chlorophyll synthesis may favor other physiological processes associated with the attenuation of salt stress (RHEIN et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Cationic Nature of Water and Hydrogen Peroxide on the Formation of Passion Fruit Seedlings1

et al. 2021

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This study was carried out with the objective of evaluating the water relations, photosynthetic pigments and growth of passion fruit cv. BRS Rubi do Cerrado, as a function of the cationic nature of irrigation water and exogenous application of hydrogen peroxide. The experiment was carried out under greenhouse conditions in Pombal – PB, Brazil. The experimental design was randomized blocks, in a 6 × 4 factorial scheme, corresponding to six cationic nature of water - CNW (S1 - Control; S2 - Na+; S3 - Ca2+; S4 - Na++Ca2+; S5 - Mg2+ and S6 - Na++Ca2++Mg2+) and four concentrations of hydrogen peroxide - H2O2 (0, 20, 40 and 60 μM), distributed in a randomized block design with four replicates. Plants in the control treatment (S1) were irrigated using water with electrical conductivity (ECw) of 0.3 dS m-1, while those of the other treatments (S2; S3; S4; S5 and S6) were subjected to ECw of 3.0 dS m-1, prepared with different cation(s). Application of 60 μM of H2O2 reduced the percentage of intercellular electrolyte leakage in plants irrigated with water of calcic composition. Salinity of water composed of sodium, sodium+calcium and sodium+calcium+magnesium, and H2O2 concentrations of 40 and 60 μM resulted in lower leaf water potential. The biomass accumulation of passion fruit was more sensitive to the variation of the electrical conductivity of the water. Regardless of the cationic nature, the use of water with electrical conductivity of 3.0 dS m-1 produced passion fruit seedlings with a Dickson quality index higher than 0.2, considered acceptable.

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“…O incremento de massa seca nas plantas coincide com o aumento de área foliar e teor de clorofila, sendo que plantas quando cultivadas em condições de estresse, podem apresentar mais clorofila (Ilic et al, 2015), isso por que, em condições de estresse, as plantas reduzem a taxa fotossintética, o fechamento estomático, além de reduzir a biossíntese de clorofila (Rhein et al, 2015) e, em condições de diferentes disponibilidade hídrica, reduz o crescimento (Flowers & Colmer, 2008;Santos et al, 2013). Porém, no presente trabalho apenas os teores de clorofila b apresentaram correlação significativa (fraca) com massa seca de folhas e fitomassa seca total.…”

Section: Discussionunclassified

Correlação de Pearson entre pigmentos fotossintetizantes e fitomassa de plantas de Aloysia triphylla

Thiesen

Pinheiro

Holz

et al. 2017

J. Env. Anal. Progr.

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Thiesen, L. A.; Pinheiro, M. V. M.; Holz, E.; Fontana, D. C.; Santos, J. dos 249 Journal of Environmental Analysis and ProgressJournal homepage: www.jeap.ufrpe.br/ http://dx. A B S T R A C TThe dry matter production of the crops is limited by the photosynthetic pigments, an indicator of productivity that may be restricted to the growth and development of plants. The objective of the study was to determine a correlation between photosynthetic pigments and a phytomass of Aloysia triphylla in response to different water availability. The experiment was carried out in a protected environment at the Federal University of Santa Maria, Campus Frederico Westphalen. It was conducted in a randomized block design with four treatments, four blocks and the experimental unit composed of 16 plants/block, in the period of August 28, 2015, to March 21, 2016. The treatments consisted of different levels of water availability (100, 75, 50 and 25% of the soil field capacity). They were evaluated: Chlorophyll a, chlorophyll b, carotenoids, total chlorophyll, chlorophyll a/b ratio, total chlorophyll/carotenoid ratio and total dry matter, dry mass of leaves and stem. Data were submitted to Pearson's linear correlation aiming to verify the dependence of one variable on another. After 152 days, it was possible to observe that there was a high and positive correlation between chlorophyll a and b, both of which presented a negative correlation with the chlorophyll a/b ratio. Chlorophyll b showed correlation with total phytomass and leaves. It was also observed that total chlorophyll showed correlation with all variables, except for those of stem and leaf dry matter and total phytomass. It was concluded that chlorophyll b presents positive correlation with dry leaf mass and total dry matter, and the leaf dry mass has a positive correlation with dry stem mass and total phytomass of A. triphylla.

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Crescimento radicular e pigmentos clorofilianos em duas forrageiras submetidas a níveis crescentes de NaCl

Cited by 4 publications

References 20 publications

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

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

Cationic Nature of Water and Hydrogen Peroxide on the Formation of Passion Fruit Seedlings1

Correlação de Pearson entre pigmentos fotossintetizantes e fitomassa de plantas de Aloysia triphylla

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