Control of abscisic acid synthesis

Taylor, I. B.; Burbidge, Alan; Thompson, Andrew J.

doi:10.1093/jexbot/51.350.1563

Cited by 250 publications

(161 citation statements)

References 51 publications

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“…A redução na condutância se deve ao decréscimo na disponibilidade de água no solo, que ocasiona queda no potencial da água nas folhas, levando-as à perda de turgescência e à redução da condutância estomática (Paiva et al, 2005). Outra explicação é a sinalização proporcionada pelo ácido abscísico produzido no sistema radicular, induzindo o fechamento dos estômatos presentes nas folhas (Taylor et al, 2000), reduzindo assim a condutância estomática. A utilização de caracteres morfológicos aliados ao rendimento de frutos pode fornecer os subsí-dios necessários para identificação de plantas com maior resistência ao déficit hídrico.…”

Section: Resultsunclassified

Caracterização Do Tomateiro Submetido Ao Déficit Hídrico

Morales¹,

Resende

Bordini

et al. 2015

RSA

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RESUMOO experimento foi conduzido com o objetivo avaliar as características morfofisiológicas do tomateiro quando submetido a diferentes níveis de déficit hídrico e, com base nesses resultados, indicar os melhores caracteres para seleção de plantas com maior resistência ao déficit hídrico. O delineamento experimental foi em blocos casualizados, com quatro repetições, no esquema de parcelas subdivididas, em que os tratamentos principais (parcelas) foram constituídos por duas linhagens (TOM-684 e M-82) e as subparcelas por quatro níveis de umidade do solo (100 %, 75 %, 50 % e 25 % da capacidade de campo). Foram avaliados os seguintes caracteres: produção de frutos, massa fresca e seca das folhas, caule e sistema radicular, diâmetro do caule, altura das plantas, número de folhas, fotossíntese, transpiração, temperatura foliar, umidade intercelular, dióxido de carbono intercelular, condutância estomática, condutância de CO 2 intercelular e condutância total. Com a redução da umidade do solo houve redução do número de folhas, altura das plantas, massa fresca e seca das folhas, caule e sistema radicular, transpiração, taxa fotossintética, produção de frutos e aumento da temperatura foliar. A condutância estomática diferiu entre as duas linhagens, com maiores valores para a cultivar TOM-684, que reduziu a condutância estomática de 0,70 para 0,25 mol m -2 s -1 entre os níveis de 100 e 25 % da capacidade de campo. A altura das plantas e o número de folhas podem ser utilizadas em programas de melhoramento como ferramenta para seleção de plantas com maior resistência ao déficit hídrico.Palavras-chave: Solanum lycopersicum; Tolerância a seca; Déficit hídrico; Eficiência do uso da água. ABSTRACTThe experiment was conducted to evaluate the morphological/physiological characteristics of tomato plants when submitted to different levels of water deficit and, based on these results, indicate the best characters for the selection of plants with more tolerance to water deficit. The experimental delineation was in randomized complete block design, with four replications, arranged in splitplot, in which the main treatments (plots) were composed by two strains (TOM-684 and M-82) and the subplots, by four levels of soil moisture (100 %, 75 %, 50 % and 25 % of the field capacity). The following parameters were evaluated: fruit production, leaf, stem and root system fresh and dry mass, , stem diameter, plant height, number of leaves, photosynthesis, transpiration, foliar temperature, intracellular moisture, intracellular carbon dioxide, stomatal conductance, conductance of intracellular CO 2 and total conductance. With the reduction of soil moisture occurred reduction in the number of leaves, plant height and leaf, stem and root system fresh and dry mass, transpiration, photosynthetic rate, fruit production and increase of foliar temperature The stomatal conductance differed between both strains, with higher values for the TOM-684 strain, which reduced stomatal conductance from 0,70 to 0,25 mol m -2 s -1 between levels of 100 and 25 % of...

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Section: Resultsunclassified

Caracterização Do Tomateiro Submetido Ao Déficit Hídrico

Morales¹,

Resende

Bordini

et al. 2015

RSA

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“…Studies have suggested that the stress that is caused by drought and decreased cell volume during desiccation induces the accumulation of ABA [21] [22]. In this way, many of the physiological and biochemical changes caused by ABA in developing embryos can be induced by low osmotic potential [18].…”

Section: Resultsmentioning

confidence: 99%

Reduced Sensitivity of <i>Campomanesia adamantium</i> (Cambess.) O. Berg Seeds to Desiccation: Effects of Polyethylene Glycol and Abscisic Acid

Dresch¹,

Masetto²,

Jeromini³

et al. 2017

AJPS

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The Campomanesia adamantium is a threatened species from Brazil Savannah which seeds are desiccation-sensitive and do not withstand storage. This study aimed to reduce the sensitivity of Campomanesia adamantium seeds to desiccation using polyethylene glycol (PEG) and abscisic acid (ABA). Initially, seeds were subjected to PEG (0, −1.48, and −2.04 MPa) with or without ABA (100 μM) during 120 h, followed fast drying (silica gel) or slow drying (laboratory environment), at 20%, 15%, and 10% moisture content. In the second experiment, the seeds were PEG treated (−1.48 MPa) which provided the best results in the first experiment; the seeds were then subjected to different incubation times in PEG (30, 60, 90, or 120 h) and ABA (0, 10 −3 , 10 −4 , and 10 −5 µM), following the seeds were fast dried at 15% moisture content. The slow drying should be avoided, even in seeds previously subjected to osmotic conditioning with or without ABA. Seeds submitted to PEG treatment (−1.48 MPa/120h) without ABA and PEG (−1.48 MPa) with 10 −3 or 10 −4 µM of ABA (90 h), followed by fast drying at 15% moisture content showed reduction of desiccation sensitivity and high germination and vigor when compared to the other treatments.

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“…ABA accumulates under hyperosmotic conditions and triggers the closure of guard cells (to prevent water loss) in consonance with expression of ABA-specific stress responsive genes (Leung and Giraduat, 1998;Taylor et al, 2000;Wilkinson and Devis, 2002). Also, ABA independent signaling pathways are activated (Ingram and Bartels, 1996).…”

Section: Abscisic Acid (Aba) and Stressmentioning

confidence: 99%

Sucrose non-fermenting 1-related protein kinase 2 (SnRK2): a family of protein kinases involved in hyperosmotic stress signaling

Shukla

Mattoo

2008

Physiol Mol Biol Plants

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Our understanding of plant adaptation to abiotic stresses, which include drought, salinity, non-optimal temperatures and poor soil nutrition, is limited, although significant strides have been made in identifying some of the gene players and signaling partners. Several protein kinases get activated in plants in response to osmotic stress and the stress hormone abscisic acid (ABA). Among these is a superfamily of sucrose non-fermenting protein kinase genes (SnRK2). This review focuses on the developments related to the activity, substrates, interacting proteins and gene regulation of SnRK2 gene family members. Reversible phosphorylation as a crucial regulatory mechanism turns out to be a rule rather than an exception in plant responses to abiotic stress. Nine out of thirteen bZIP transcription factors (ABI5/ABF/AREB family) share the recognition motif, R-Q-X-S/T, suggesting that likely SnRK2 kinases have a major role in regulating gene expression during hyperosmotic stress.

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Control of abscisic acid synthesis

Cited by 250 publications

References 51 publications

Caracterização Do Tomateiro Submetido Ao Déficit Hídrico

Caracterização Do Tomateiro Submetido Ao Déficit Hídrico

Reduced Sensitivity of <i>Campomanesia adamantium</i> (Cambess.) O. Berg Seeds to Desiccation: Effects of Polyethylene Glycol and Abscisic Acid

Sucrose non-fermenting 1-related protein kinase 2 (SnRK2): a family of protein kinases involved in hyperosmotic stress signaling

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Control of abscisic acid synthesis

Cited by 250 publications

References 51 publications

Caracterização Do Tomateiro Submetido Ao Déficit Hídrico

Caracterização Do Tomateiro Submetido Ao Déficit Hídrico

Reduced Sensitivity of &lt;i&gt;Campomanesia adamantium&lt;/i&gt; (Cambess.) O. Berg Seeds to Desiccation: Effects of Polyethylene Glycol and Abscisic Acid

Sucrose non-fermenting 1-related protein kinase 2 (SnRK2): a family of protein kinases involved in hyperosmotic stress signaling

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Reduced Sensitivity of <i>Campomanesia adamantium</i> (Cambess.) O. Berg Seeds to Desiccation: Effects of Polyethylene Glycol and Abscisic Acid