The role of proline accumulation in halophytes

Stewart, George R.; Lee, J. A.

doi:10.1007/bf00390296

Cited by 611 publications

(262 citation statements)

References 27 publications

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“…Osmolytes are 'compatible solutes', very soluble, low-molecular-weight organic compounds that do not interfere with normal metabolism even when present at high concentrations. While toxic inorganic ions are sequestered in vacuoles, organic osmolytes accumulate predominantly in the cytoplasm, preventing or limiting cellular dehydration (Büssis and Heineke, 1998;Handa et al, 1986;Stewart and Lee, 1974). Reduction of the osmotic potential due to accumulation of osmolytes in response to stress improves the ability of the plant cells to maintain turgor pressure at low water potentials, which is essential for biological processes such as photosynthesis or cell expansion, as well as for maintaining enzymatic activities (Tyree and Jarvis, 1982).…”

Section: Introductionmentioning

confidence: 99%

Effects of Salt and Water Stress on Plant Growth and on Accumulation of Osmolytes and Antioxidant Compounds in Cherry Tomato

Hassan

Fuertes

Sánchez

et al. 2015

Not Bot Hort Agrobot Cluj

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The effects of salt and water stress on growth and several stress markers were investigated in cherry tomato plants. Some growth parameters (stem length and number of leaves) and chlorophyll contents were determined every third day during plant growth, and leaf material was collected after 25 and 33 days of treatment. Both stresses inhibited plant growth; chlorophyll levels, however, decreased only in response to high NaCl concentrations. Proline contents largely increased in leaves of stressed plants, reaching levels high enough to play a major role in cellular osmotic adjustment. Despite reports indicating that tomato does not synthesize glycine betaine, the stress-induced accumulation of this osmolyte was detected in cherry tomato, albeit at lower concentration than that of proline. Therefore, it appears that the plants are able to synthesise glycine betaine as a secondary osmolyte under strong stress conditions. Total sugars levels, on the contrary, decreased in stress-treated plants. Both stress treatments caused secondary oxidative stress in the plants, as indicated by a significant increase in malondialdehyde (MDA) contents. Water stress led to an increase in total phenolics and flavonoid contents and a reduction of carotenoid levels in the leaves; flavonoids also increased under high salinity conditions.

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Section: Introductionmentioning

confidence: 99%

Effects of Salt and Water Stress on Plant Growth and on Accumulation of Osmolytes and Antioxidant Compounds in Cherry Tomato

Hassan

Fuertes

Sánchez

et al. 2015

Not Bot Hort Agrobot Cluj

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“…It was observed that the degree of "peteca" incidence in the fruit decreases, as the proline content in the albedo tissues increases, indicating that it might be an interaction between this amino acid with some cell constituents, which might generate a lower response to the damage by "peteca", as proline diminishes the consequences and disturbances caused by dehydration in the cells, as well as it interacts with some enzymes, favoring the structure preservation and activity of the membrane, protecting the cell walls structurally and functionally (Stewart and Lee, 1974;Chadalavada et al, 1994;Hamilton and Heckathorn, 2001). Additionally, it has been observed that proline might act increasing the cell osmolarity, helping provide the necessary turgor for cell stability and growth (Hanson et al,.…”

Section: Resultsmentioning

confidence: 99%

Peteca rind pitting as influenced by proline content in winter lemon albedo

Fichet

Chamorro²,

Riquelme

2012

Cienc. Inv. Agr.

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T. Fichet, J. Chamorro, and A. Riquelme. 2012. Peteca rind pitting as influenced by proline content in winter lemon albedo. Cien. Inv. Agr. 39(1): 201-209. One of the most important problems in lemon growing is the physiological disorder known as "peteca", which is characterized by causing cell dehydration and death in the albedo tissue with a subsequent necrosis of the surface zone of the fruit. This damage shows characteristics quite similar to those resulting from chilling injury in citrus fruit, where surface damage of fruit and dehydration of albedo cells also occur. Resistance to chilling injury shown by grapefruit would be related to increased proline content in the albedo (Purbis, 1981). In this study, proline content of lemons cv. "Fino" 49 from two groves, one in Curacaví (33°25.778 S -71°02.292 W, 196 m above sea level) and the other in Mallarauco (33°94.984 S -70°58.921 W, 269 m above sea level), was analyzed and determined. The Curacaví grove had a low incidence of peteca, whereas the Mallarauco grove exhibited a high incidence of this disorder. Significant differences in albedo proline content were found between both groves and content of this amino acid was highly associated to the degree of peteca incidence. Proline might be playing a role in the lower incidence of "peteca" in winter lemon fruit.

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“…compatível no citoplasma para neutralizar os efeitos dos sais acumulados no vacúolo (Steward et al, 1974;LeRudulier et al, 1984). O acúmulo de prolina favorece também a hidratação do protoplasma alem de funcionar como reserva, especialmente para a síntese de algumas enzimas específicas (Navari-Izzo et al, 1990;Lima et al, 1997).…”

Section: Resultsunclassified

Crescimento de calos embriogênicos de milho submetidos ao estresse salino<A NAME="top"></A>

Bezerra

Willadino

Câmara

2001

Sci. agric. (Piracicaba, Braz.)

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RESUMO: A salinidade do solo é um problema muito importante em áreas irrigadas do semi-árido brasileiro, onde o milho é uma cultura de subsistência. Este trabalho teve como objetivo estudar o efeito de concentrações de NaCl sobre calos embriogênicos, da cultivar Jatinã C3 Anão, uma importante cultivar de milho no Nordeste do Brasil. A indução dos calos foi feita a partir de embriões imaturos assepticamente retirados das sementes e inoculados em meio de cultura N6 suplementado com 2 mg L -1 de 2,4-D. Os calos embriogênicos foram submetidos a diferentes concentrações de cloreto de sódio (0; 50; 100; 150 e 200 mmol L -1 de NaCl), com três repetições durante 60 dias. Os calos submetidos a 100 mmol L -1 de NaCl apresentaram aumento no conteúdo de prolina na ordem de 37% quando comparado com o nível de 50 mmol L -1 de NaCl, sugerindo um efeito positivo da acumulação deste aminoácido em resposta ao estresse salino. Por outro lado, em elevadas concentrações salinas (150 e 200 mmol L -1 ) observou-se decréscimo no crescimento dos calos, bem como redução nos teores de prolina, provavelmente em função de um aumento da fração não embriogênica dos calos. Palavras-chave: Zea mays, salinidade, embriogênese somática, prolina EMBRYOGENIC CALLUS GROWTH OF MAIZE SUBMITTED TO SALT STRESSABSTRACT: Soil salinity is a very important problem in irrigated areas of the brazilian semi-arid area, where maize is a subsistence crop. To study the effect of NaCl concentrations in embryogenic calli of Jatinã C3 Anão, an important maize cultivar of the Northest of Brazil, calli were induced using immature embryos aseptically removed from the seeds and grown on N6 medium supplemented with 2 mg L -1 of 2,4-D. To study the effect of salinity in vitro, embryogenic calli were subjected to different concentrations of sodium chloride (0; 50; 100; 150 and 200 mmol L -1 of NaCl), in three replicates, during 60 days. Calli subjected up to100 mmol L -1 NaCl showed proline concentration 37% higher than callus treated with 50 mmol L -1 NaCl. This result suggests a positive effect of proline accumulation at salt stress conditions. However, at the highest concentration tested (150-200 mmol L -1 NaCl) as lower growth and also a lower proline accumulation was observed, probably due to an increase of the non embryogenic fraction of calli.

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The role of proline accumulation in halophytes

Cited by 611 publications

References 27 publications

Effects of Salt and Water Stress on Plant Growth and on Accumulation of Osmolytes and Antioxidant Compounds in Cherry Tomato

Effects of Salt and Water Stress on Plant Growth and on Accumulation of Osmolytes and Antioxidant Compounds in Cherry Tomato

Peteca rind pitting as influenced by proline content in winter lemon albedo

Crescimento de calos embriogênicos de milho submetidos ao estresse salino<A NAME="top"></A>

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