Drought Tolerance

Ashraf, Muhammad; Akram, Nudrat Aisha; Al‐Qurainy, Fahad; Foolad, Majid R.

doi:10.1016/b978-0-12-387689-8.00002-3

Cited by 139 publications

(40 citation statements)

References 215 publications

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“…Ele confere proteção por curtos períodos de tempo de estresse e é importante quando as condições não tardam a se normalizar. Esse mecanismo se estabelece mediante o acúmulo, no vacúolo ou no citosol, de solutos compatíveis (prolina, glicina betaína, trealose, sacarose, poliaminas, manitol, pinitol, entre outros) que contribuem para a manutenção do equilíbrio hídrico e a preservação da integridade de proteínas, enzimas e membranas celulares (Ashraf et al, 2011;Marijuan & Bosch, 2013). Esses solutos também têm função osmoprotetora contra subprodutos tóxicos do metabolismo, resultantes do estresse hídrico.…”

Section: Introductionunclassified

“…O aminoácido prolina é o soluto compatível mais estudado, em razão de sua sensibilidade de resposta a condições de estresse (Trovato et al, 2008;Verbruggen & Hermans, 2008;Ashraf et al, 2011). Em plantas sob estresse, o conteúdo de prolina pode aumentar até 100 vezes, em comparação ao observado em plantas cultivadas sob condições normais (Verbruggen & Hermans, 2008).…”

Section: Introductionunclassified

“…Segundo os autores, o acúmulo ocorre pela síntese "de novo" ou pela inibição do processo de oxidação da prolina. Embora haja abundante literatura sobre o acúmulo de prolina, em plantas sob vários tipos de estresse, não se sabe ao certo se esse acúmulo sempre ocorre (Trovato et al, 2008;Ashraf et al, 2011;Szábados et al, 2011).…”

Section: Introductionunclassified

“…Os relatos indicam que, sob condições de estresse, o conteúdo de poliaminas endógenas em algumas plantas podem diminuir. Dessa forma, o uso de poliaminas exógenas, em especial da putrescina, pode atenuar os efeitos de vários tipos de estresse nas plantas e aumentar a tolerância das culturas (Quinet et al, 2010;Ashraf et al, 2011;Hussain et al, 2011;Sharma et al, 2011;Amri & Mohammadi, 2012;Gupta et al, 2013;Kotakis et al, 2014).…”

Section: Introductionunclassified

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Crescimento e conteúdo de prolina em plântulas de guandu submetidas a estresse osmótico e à putrescina exógena

Monteiro¹,

Cruz

Nardin

et al. 2014

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi verificar o efeito da aplicação da poliamina putrescina no acúmulo de prolina e no crescimento inicial de plântulas de guandu cultivadas sob estresse hídrico ou salino, e avaliar se esta poliamina pode ser usada como atenuadora desses estresses. Sementes de duas cultivares de guandu, BRS Mandarim e Caqui, foram germinadas em caixas gerbox forradas com papel de filtro umedecido com 0,0, -0,2, -0,3, -0,4, -0,5 MPa de PEG 6000 ou 0, 20, 40, 60, 80 e 120 mmol L -1 de NaCl, na ausência (0 mmol L -1 ) ou na presença (0,5 mmol L -1 ) de putrescina. Utilizou-se o delineamento inteiramente casualizado, em arranjo fatorial 2x5x2 e 2x6x2 (duas cultivares, cinco níveis de deficiência hídrica ou seis níveis de estresse salino, e presença ou ausência de putrescina), com quatro repetições. O crescimento das plântulas é acentuadamente reduzido pelas condições de restrição hídrica e salinidade. A putrescina exógena incrementa, sob ambos os estresses, os teores de prolina nas plântulas de guandu, especialmente na cultivar BRS Mandarin, e atenua os efeitos da deficiência hídrica moderada nas cultivares estudadas. Os estresses de restrição hídrica e de salinidade causam acúmulo de prolina na parte aérea e nas raízes de ambas as cultivares. A prolina pode ser considerada um bom indicador bioquímico e fisiológico desses estresses em plântulas de guandu.Termos para indexação: Cajanus cajan, indicador bioquímico, poliamina, restrição hídrica, salinidade, solutos compatíveis.Growth and proline content in pigeon pea seedlings subjected to osmotic stress and to exogenous putrescine Abstract -The objective of this work was to verify the effect of the application of the polyamine putrescine on the accumulation of proline and on the early seedling growth of pigeon pea subjected to water or salt stress, and to evaluate whether this polyamine can be used to alleviate these stresses. Seeds of two cultivars of pigeon pea, BRS Mandarim and Caqui, were germinated in gerbox boxes lined with filter papers soaked with 0.0, -0.2, -0.3, -0.4, -0.5 MPa PEG 6000 or 0, 20, 40, 60, 80, and 120 mmol L -1 NaCl, in the absence (0 mmol L -1 ) or presence (0.5 mmol L -1 ) of putrescine. A completely randomized design was used, in a 2x5x2 and 2x6x2 factorial arrangement (two cultivars, five levels of drought or six levels of salt stress, and presence or absence of putrescine), with four replicates. Seedling growth is highly reduced by water restriction and salinity conditions. Exogenous putrescine increases, under both stresses, the proline contents in pigeon pea seedlings, especially in the cultivar BRS Mandarin, and alleviates the effects of moderate water deficiency on the studied cultivars. Water restriction and salinity stresses cause accumulation of proline content in shoots and roots of both cultivars. Proline can be considered a good biochemical and physiological indicator of these stresses in pigeon pea seedlings.Index terms: Cajanus cajan, biochemical indicator, polyamine, water restriction, salinity, compatible so...

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Section: Introductionunclassified

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Crescimento e conteúdo de prolina em plântulas de guandu submetidas a estresse osmótico e à putrescina exógena

Monteiro¹,

Cruz

Nardin

et al. 2014

Pesq. agropec. bras.

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“…[1][2][3][4] Interestingly, this kind of the analysis is also capable of providing an informative value about the environmental pollution of the area from which honey is derived. [5][6][7] From the data of recent studies, in which the functional speciation approach was used to analyze samples of dark honeys, 8,9 it transpires that such metals as Ca, Fe, Mg and Zn are not exclusively present in this matrix in the form of simple ions but are bound to some extant with different endogenous bioligands that can modulate their mobility and availability. Accordingly, using a non-ionic adsorbing resin Amberlite XAD-16 and a strong acidic cation exchange resin Dowex 50W×8 connected in a series, it was possible in quoted works to extract three operationally defined fractions of metals differing in the hydrophobicity and charge of their species, i.e., hydrophobic, cationic and residual.…”

Section: Introductionmentioning

confidence: 99%

Determination of the hydrophobic fraction of Ca, Fe, Mg and Zn in dark color honeys using solid phase extraction and flame atomic absorption spectrometry

Pohl

Stecka

Gręda

2012

J. Braz. Chem. Soc.

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Neste estudo, avaliou-se a fração hidrofóbica de Ca, Fe, Mg e Zn em méis escuros por meio de extração em fase sólida utilizando material à base de sílica gel com grupos ativos fenil ligados monomericamente. Verificou-se que Fe está associado com esta fração, provavelmente compostos polifenólicos, no mais alto grau. A contribuição da fração hidrofóbica no conteúdo total deste elemento nos méis analisados representou 7-43%. A confiabilidade destes resultados foi verificada através de extração em fase sólida utilizando material à base de sílica gel com grupos ativos octadecil ligados polimericamente (Superclean ENVI DSC-18). Além disso, estabeleceu-se uma forte correlação positiva entre a concentração de Fe na fração hidrofóbica avaliada e a densidade óptica dos méis escuros, indicando uma possível contribuição dos complexos azuis deste metal com substâncias fenólicas para a cor global do mel.In this study, the hydrophobic fraction of Ca, Fe, Mg and Zn in dark honeys was assessed by means of solid phase extraction using silica gel based material with monomerically bonded phenyl active groups (Discovery ® DSC-Ph tubes). It was found that Fe is associated with this fraction, likely polyphenolic compounds, to the highest degree. The contribution of the hydrophobic fraction to the total content of this element in analyzed honeys accounted for 7-43%. The reliability of these results was verified using for solid phase extraction silica gel based material with polymerically bonded octadecyl active groups (Superclean ENVI DSC-18). Additionally, a strong positive correlation was established between the concentration of Fe in the hydrophobic fraction assessed and the optical density of dark honeys, indicating a possible contribution of blue complexes of this metal with phenolic substances to the overall color of honey.

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Avenues for improving drought tolerance in crops byABAregulation

Manzoor

Athar

Rasul

et al. 2016

Water Stress and Crop Plants

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Drought is one of the major environmental stresses that produces adverse effects on plants.Vast areas of agricultural land is susceptible to drought. Drought induced yield loss of crops has negative effects on the economy of a country. Among phytohormones, Abscisic Acid (ABA) induces abiotic stress tolerance in plants, and directs a complex regulatory network involving multiple transporters, up-regulation of ABA biosynthesis genes and various signalling pathways that enable plants to withstand low water availability. The current study was designed to understand ABA synthesis, its transport across the plant during stress and its mechanism to induce stomatal closure by using different in silico tools, because the complete ABA mediated drought tolerance has not yet been reported. In the current study, seven transporters, four ABA biosynthesis enzymes, deconjugation enzyme and a core complex of ABA signalling was verified through Modeller 9.10 and Molecular Operating Environment

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Drought Tolerance

Cited by 139 publications

References 215 publications

Crescimento e conteúdo de prolina em plântulas de guandu submetidas a estresse osmótico e à putrescina exógena

Crescimento e conteúdo de prolina em plântulas de guandu submetidas a estresse osmótico e à putrescina exógena

Determination of the hydrophobic fraction of Ca, Fe, Mg and Zn in dark color honeys using solid phase extraction and flame atomic absorption spectrometry

Avenues for improving drought tolerance in crops byABAregulation

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