Leaf gas exchange in cowpea and CO2 efflux in soil irrigated with saline water

Oliveira, Wanderson José de; Souza, Eliane Helena Alvim de; Cunha, Jaílson Cavalcante; Silva, Ênio Farias de França e; Veloso, Venâncio de Lima

doi:10.1590/1807-1929/agriambi.v21n1p32-37

Cited by 23 publications

(13 citation statements)

References 16 publications

(15 reference statements)

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“…These reductions of internal CO 2 concentration with increase in salinity levels observed in soursop cv. 'Morada Nova' are a common response of plants to salt stress, which occurs probably due to the lower CO 2 diffusion in the substomatal chamber due to stomatal closure (Oliveira et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Salt stress and exogenous application of hydrogen peroxide on photosynthetic parameters of soursop

Silva

Lima

Azevedo

et al. 2019

Rev. bras. eng. agríc. ambient.

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This study aimed to evaluate the gas exchanges and photosynthetic pigments of soursop seedlings cv. 'Morada Nova' irrigated with saline waters and subjected to exogenous application of hydrogen peroxide by seed soaking and foliar spraying. The study was carried out using plastic bags under greenhouse conditions at the Center of Technology and Natural Resources of the Federal University of Campina Grande, PB, Brazil, using a eutrophic Regolithic Neosol of sandy loam texture. Treatments were arranged in a randomized block design, in 5 x 5 factorial scheme, which consisted of five levels of electrical conductivity -ECw (0.7; 1.4; 2.1; 2.8 and 3.5 dS m -1 ) of irrigation water and five concentrations of hydrogen peroxide -H 2 O 2 (0, 25, 50, 75 and 100 µM), with four replicates and three plants per plot. As the salt stress increased, there were reductions in internal CO 2 concentration, instantaneous carboxylation efficiency and water use efficiency, and instantaneous carboxylation efficiency was the most sensitive variable. Hydrogen peroxide at concentrations of 25 and 50 µM attenuated the deleterious effects of water salinity on stomatal conductance, CO 2 assimilation rate and chlorophyll a content, and the concentration of 25 µM was the most efficient. The content of chlorophyll b and carotenoids of soursop cv. 'Morada Nova' had the deleterious effects caused by the salinity of irrigation water mitigated by the exogenous application of hydrogen peroxide in the concentration of 25 μM.Estresse salino e aplicação exógena de peróxido de hidrogênio nos parâmetros fotossintéticos da gravioleira RESUMO: Objetivou-se com este trabalho avaliar as trocas gasosas e os pigmentos fotossintéticos de mudas de gravioleira cv. Morada Nova irrigadas com águas salinas e submetidas à aplicação exógena de peróxido de hidrogênio via embebição das sementes e pulverizações foliares. O estudo foi conduzido em sacolas plásticas sob condições de casa de vegetação pertencente ao Centro de Tecnologia e Recursos Naturais da Universidade Federal de Campina Grande, PB, utilizando-se um Neossolo Regolítico Eutrófico de textura franco-arenosa. Os tratamentos foram distribuídos no delineamento de blocos casualizados, em arranjo fatorial 5 x 5, sendo cinco níveis de condutividade elétrica da água de irrigação -CEa (0,7; 1,4; 2,1; 2,8 e 3,5 dS m -1 ) e cinco concentrações de peróxido de hidrogênio -H 2 O 2 (0, 25, 50, 75 e 100 µM), com quatro repetições e três plantas por parcela. Com o aumento do estresse salino, ocorreu diminuição na concentração interna de CO 2 , na eficiência instantânea da carboxilação e na eficiência no uso da água, sendo a eficiência instantânea da carboxilação a variável mais sensível. O peróxido de hidrogênio nas concentrações de 25 e 50 µM atenuou os efeitos deletérios da salinidade da água sobre a condutância estomática, taxa de assimilação de CO 2 e no teor de clorofila a, sendo a concentração de 25 µM a mais eficiente. O teor de clorofila b e carotenóides da gravioleira cv. Morada Nova teve os efeitos deletérios causados...

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Section: Resultsmentioning

confidence: 99%

Salt stress and exogenous application of hydrogen peroxide on photosynthetic parameters of soursop

Silva

Lima

Azevedo

et al. 2019

Rev. bras. eng. agríc. ambient.

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“…According to Silva, Ribeiro, Ferreira-Silva, Viégas and Silveira (2011a), the reduction in CEi is associated with decreased RuBisCO activity. Oliveira, Souza, Cunha, Silva and Veloso (2017), in an experiment with cowpea irrigated using water with six levels of electrical conductivity (0, 2.5, 5.0, 7.5, 10.0, and 12.5 dS m -1 ), also reported that there was a linear decrease in CEi as a function of the increase in ECw levels.…”

Section: Resultsmentioning

confidence: 90%

Gas exchanges, growth and production of okra cultivated with saline water and silicon fertilization

Lima

Souza

Nobre

et al. 2020

Semina: Ciênc. Agrár.

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Excess salts in water and/or soil are a critical factor that adversely affects the physiology and growth, besides limiting the production of crops in the semiarid region of Northeast Brazil. One way to reduce the effect of salt stress on plants is by using silicon (Si) fertilization. In this context, the objective of this study was to evaluate the gas exchange, growth, and production of okra cv. Valença as a function of irrigation with saline water and Si doses. The experiment was conducted in a greenhouse in the municipality of Pombal - PB, Brazil. The experimental design adopted was randomized blocks in a 5 × 2 factorial scheme corresponding to five levels of electrical conductivity of water ECw (0.3, 1.0, 1.7, 2.4, and 3.1 dS m-1) and two doses of Si fertilization (100 and 200 g of Si per plant), with four replicates. Salt stress increased the intercellular concentration of CO2 in the substomatal chamber and reduced the CO2 assimilation rate, instantaneous carboxylation efficiency, growth, and production of okra plants. Intrinsic water use efficiency and average weights of okra fruits were not influenced by irrigation with saline water and Si doses. The supply of 200 g Si per plant reduced the deleterious effect of salt stress on stomatal conductance and leaf area of okra, at 45 days after sowing but did not increase production.

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“…As a consequence of the reduction of leaf water potential with saline irrigation, stomatal closure occurred, thus reflecting a low CO 2 assimilation rate [42,48,49]. Nevertheless, an improvement of WUE i was noted under salinity conditions as an adaptation of moderately salinity tolerant plants [50]. The greater amount of leaf K accumulated in these plants than in those irrigated with control water would also help to prevent a greater reduction in water relations by regulating cellular osmotic potentials and thus, stomatal closure [51].…”

Section: Discussionmentioning

confidence: 99%

Influence of Mixed Substrate and Arbuscular Mycorrhizal Fungi on Photosynthetic Efficiency, Nutrient and Water Status and Yield in Tomato Plants Irrigated with Saline Reclaimed Waters

Gómez-Bellot

Lorente

Sánchez-Blanco

et al. 2020

Water

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The use of reclaimed water (RW) is considered as a means of maintaining agricultural productivity under drought conditions. However, RW may contain high concentrations of salts. The use of some practices, such as biofertilizers and organic substrates, is also becoming increasingly important in agricultural. production. The aim of this study was to evaluate the application of a mixed substrate (with coconut fibre) and arbuscular mycorrhizal fungi (AMF) on water relations, nutrient uptake and productivity in tomato plants irrigated with saline RW in a commercial greenhouse. Saline RW on its own caused a nutrient imbalance and negatively affected several physiological parameters. However, the high water-holding capacity of coconut fibre in the mixed substrate increased water and nutrient availability for the plants. As a consequence, leaf water potential, gas exchange, some fluorescence parameters (PhiPSII, Fv’/Fm’, qP and ETR) and fruit size and weight improved, even in control irrigation conditions. The use of AMF improved only some parameters because of the low percentage of colonization, suggesting that AMF effectiveness in commercial field conditions is slower and dependent of several factors.

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Leaf gas exchange in cowpea and CO2 efflux in soil irrigated with saline water

Cited by 23 publications

References 16 publications

Salt stress and exogenous application of hydrogen peroxide on photosynthetic parameters of soursop

Salt stress and exogenous application of hydrogen peroxide on photosynthetic parameters of soursop

Gas exchanges, growth and production of okra cultivated with saline water and silicon fertilization

Influence of Mixed Substrate and Arbuscular Mycorrhizal Fungi on Photosynthetic Efficiency, Nutrient and Water Status and Yield in Tomato Plants Irrigated with Saline Reclaimed Waters

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