Crescimento e níveis de solutos orgânicos e inorgânicos em cultivares de Vigna unguiculata submetidos à salinidade

Costa, Paulo; Silva, José V.; Bezerra, Marlos Alves; Filho, Joaquim Enéas; Prisco, José Tarquı́nio; Gomes-Filho, Enéas

doi:10.1590/s0100-84042003000300002

Cited by 37 publications

(54 citation statements)

References 27 publications

(21 reference statements)

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“…The results showed increases in leaf succulence (Figure 4) and specific leaf mass (Table 2) in leaves growing during salt stress and in leaves already developed before stress application, but only leaf succulence was correlated to ion accumulation (data not shown), especially chloride, as suggested by others (e.g., Strogonov, 1964;Zekri, 1991). The increase in specific leaf mass in fully expanded mature leaves suggest that this response could be directly associated with increase in mesophyll thickness, thus not being a response due simply to reduction in leaf growth and increased cell wall thickness (Wigharajah et al, 1975;Shannon et al, 1994;Costa et al, 2003).…”

Section: Values Of F Testsupporting

confidence: 53%

“…Some responses of cowpea seedlings grown under salt stress have already been observed, and it is known that there is a delay in germination and seedling establishment as a result of salinity (Gomes-Filho et al, 1983;Sousa et al, 2003) related to changes in enzymatic activity (Gomes-Filho et al, 1983) and in gene expression (Sousa et al, 2003). In addition, there are changes in mineral accumulation (Costa et al, 2003) and other physiological processes (Silva et al, 2003b).…”

Section: Introductionmentioning

confidence: 99%

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Morpho-physiological responses of cowpea leaves to salt stress

Lacerda¹,

Júnior²,

Filho³

et al. 2006

Braz. J. Plant Physiol.

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Respostas morfofisiológicas de folhas de feijão-de-corda ao estresse salino: Neste trabalho estudou-se a influência do estresse salino sobre as respostas morfológicas e fisiológicas de diferentes tipos de folhas de plantas de feijão-de-corda [Vigna unguiculata (L.) Walp.], buscando-se entender o processo de aclimatação da planta ao estresse salino. Sementes selecionadas foram semeadas em vermiculita e, após 7 d as plântulas foram transferidas para bandejas de plástico contendo solução nutritiva, e mantidas em casa de vegetação. Após a emergência do primeiro trifólio, as plantas foram transferidas para vasos contendo 3 L de solução nutritiva, deixando-se apenas uma planta por vaso. Utilizou-se um tratamento-controle (sem adição de NaCl) e um salino (75 mmol L -1 de NaCl), iniciando-se a adição parcelada do NaCl (25 mmol L -1 por dia) 5 d após o transplantio para os vasos. Durante o período experimental, foram realizadas, na folha primária e nas 1 a , 2 a e 3 a folhas trifolioladas a partir da base da planta, as seguintes avaliações: área foliar, grau de suculência, massa específica, teores de íons, teor de clorofila e a taxa fotossintética líquida. No final do período experimental foram feitas as análises de crescimento da planta inteira. A salinidade não afetou a taxa fotossintética líquida, porém reduziu a produção de matéria seca e o número de ramos laterais. Os teores de Na, Cl, K e P aumentaram nas folhas de plantas estressadas, porém essas repostas foram especialmente influenciadas pelo tempo e pela idade da folha. Os maiores teores de Na e Cl nas folhas mais velhas podem contribuir para reduzir o acúmulo desses íons nas partes em crescimento, porém a tendência de acúmulo de K e P em folhas de plantas estressadas pode ser conseqüência da redução na retranslocação, não contribuindo para a aclimatação da planta ao estresse. Por outro lado, a salinidade aumentou a relação fonte/dreno, a suculência, a massa específica e o teor de clorofila por unidade de área foliar, sugerindo que essas mudanças observadas podem constituir parte de um processo integrado de aclimatação da planta ao estresse. Palavras-chave: aclimatação, fotossíntese, partição de fotoassimilados, salinidade, teores de íons The effect of salt stress of known intensity and duration on morpho-physiological changes in leaves of different ages from cowpea [Vigna unguiculata (L.) Walp.] plants was studied, aiming for a better understanding of the acclimation process of the whole-plant. Seeds were sown in vermiculite and seedlings were transferred to plastic trays containing aerated nutrient solution, and kept in a greenhouse. When the first trifoliate leaf emerged the seedlings were transplanted into 3 L plastic pots containing aerated nutrient solution. Salt additions started 5 d later, and the salt-treated plants received 25 mmol L -1 per day until reaching a final concentration of 75 mmol L -1 . During the experimental period primary leaves and the 1 st , 2 nd , and 3 rd trifoliate leaves were used for measurements of net photosynthesis, leaf area,...

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Section: Values Of F Testsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Morpho-physiological responses of cowpea leaves to salt stress

Lacerda¹,

Júnior²,

Filho³

et al. 2006

Braz. J. Plant Physiol.

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“…While some authors consider that the transitory decline in the surface area is a tolerance mechanism that enables water conservation (Matos 2013), others believe that a more pronounced reduction in leaf area is a characteristic of sensitivity, since it causes a decline in the photosynthetic area, gas exchanges and, consequently, biomass yield (Costa et al 2003). Given that the biomass yield and leaf area of the 'BRS Alegria' cultivar fell 50 % at a concentration of 32 mM of NaCl, the data indicate that this cultivar is salt sensitive.…”

Section: Resultsmentioning

confidence: 99%

Growth and contents of organic and inorganic solutes in amaranth under salt stress

Menezes

Neto

Ribeiro

et al. 2017

Pesqui. Agropecu. Trop.

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Amaranthus cruentus L. is a forage species, with grains that exhibit excellent nutritional characteristics, being the 'BRS Alegria' the first cultivar recommended for cultivation in Brazil. This study aimed at evaluating the effect of salt stress on the growth and concentrations of organic and inorganic solutes in Amaranthus cruentus L. ('BRS Alegria' cultivar). Height, stem diameter, number of leaves, leaf, stem and root dry mass, leaf area, relative water content and membrane integrity percentage, as well as soluble carbohydrate, free amino acid, soluble protein, free proline, Na+, Cl- and K+ contents, were evaluated in different plant organs. Salinity significantly reduced the biomass yield and leaf area from the treatment with 25 mM of NaCl, indicating that the 'BRS Alegria' cultivar is sensitive to salt stress. Soluble carbohydrates in the leaves decreased by 59 %, while the other organic solutes showed no substantial increases. These results, coupled with the reduction in the relative water content and membrane integrity, suggest a low ability of this cultivar to adjust osmotically under salt stress. The K+/Na+ ratio abruptly decreased in 25 mM of NaCl, suggesting an ionic imbalance, which may partially explain the salt-induced growth reduction.

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“…Diferentes resultados têm sido encontrados na literatura sobre a acumulação de potássio em plantas de feijão caupi expostas à salinidade. Há relatos de acúmulo do íon em alguns genótipos e redução em outros (Costa et al, 2003).…”

Section: Massa Seca Total E Transpiraçãounclassified

Temperaturas elevadas afetam a distribuição de íons em plantas de feijão caupi pré-tratadas com NaCl1

Dutra

Silva

Rodrigues

et al. 2011

Rev. bras. eng. agríc. ambient.

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The purpose of this study was to characterize the effect of temperature on the distribution of Na + , Cl -and K + in roots, stems and leaves of cowpea pre-treated with NaCl. After the acclimation period, plants were divided into two groups: 0 NaCl and 100 mM NaCl for 2 days. Subsequently, the plants were divided into 4 sub-groups and subjected to increasing temperatures of 27, 32, 37 and 42 °C, separately, for a photoperiod of 12 hours at each temperature. The treatment without NaCl at 27 ºC was used as reference. The concentrations of Na + and Cl -in different organs were increased by pretreatment with NaCl and this accumulation was intensified by exposure to high temperatures. In roots, for example, at temperature of 42 ºC concentrations of Na were four times higher than in leaves. While Cl -accumulated mainly in leaves, with a 20-fold increase in the concentration of this ion in relation to reference plants. Inversely, K + concentrations were reduced in all organs analyzed. Thus, it is conclude that high temperatures affect the distribution of ions in different organs directly affecting ion homeostasis in plants.

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Crescimento e níveis de solutos orgânicos e inorgânicos em cultivares de Vigna unguiculata submetidos à salinidade

Cited by 37 publications

References 27 publications

Morpho-physiological responses of cowpea leaves to salt stress

Morpho-physiological responses of cowpea leaves to salt stress

Growth and contents of organic and inorganic solutes in amaranth under salt stress

Temperaturas elevadas afetam a distribuição de íons em plantas de feijão caupi pré-tratadas com NaCl1

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