The poplar K<sup>+</sup> channel KPT1 is associated with K<sup>+</sup> uptake during stomatal opening and bud development

Langer, Katharina; Levchenko, Victor; Fromm, Jörg; Geiger, Dietmar; Steinmeyer, Ralf; Lautner, Silke; Ache, Peter; Hedrich, Rainer

doi:10.1111/j.0960-7412.2003.02008.x

Cited by 52 publications

(49 citation statements)

References 48 publications

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“…De acordo com Prado (2008), mais de 60 enzimas dependem do K para sua atividade normal. Esse elemento também exerce papel-chave na regulação osmótica e promove a manutenção do turgor nas células-guardas, por meio da elevação do seu potencial osmótico, o que resulta em absorção de água por essas células e por adjacentes, e, consequentemente, gera maior turgor e abertura dos estômatos (Langer et al, 2004).…”

Section: Introductionunclassified

Respostas fisiológicas de cultivares de soja à adubação potássica sob diferentes regimes hídricos

Catuchi

Guidorizzi

Guidorizi

et al. 2012

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a interferência da adubação potássica em parâmetros fisiológicos de duas cultivares de soja, sob diferentes regimes hídricos. O experimento foi realizado em condições de casa de vegetação, em Presidente Prudente, SP. Utilizou-se o delineamento experimental inteiramente casualizado, em arranjo fatorial 2x2x3, com as cultivares BR-16 (tolerante ao estresse hídrico) e Embrapa 48 (suscetível), regimes hídricos com reposição diária de água de 100% (controle) e de 40% da capacidade de campo, e três níveis de suplementação com K (0, 90 e 180 mg dm -3). Duas semanas após a imposição da restrição hídrica, foram avaliados: conteúdo relativo de água, potencial fotossintético e rendimento de biomassa. As plantas que se desenvolveram sob restrição hídrica tiveram sua capacidade fotossintética reavaliada após 12 horas de reidratação. Em condições de restrição hídrica, a adubação potássica não interferiu significativamente nos parâmetros fisiológicos e de crescimento avaliados. A suplementação com potássio promoveu melhor eficiência dos parâmetros fisiológicos, no regime sem deficiência hídrica, nas duas cultivares, e as principais variáveis influenciadas pelo nutriente foram: condutância estomática, taxa máxima de carboxilação da Rubisco e assimilação máxima de CO 2 . A suplementação com K melhora a recuperação fotossintética das plantas após a reidratação, especialmente na cultivar Embrapa 48.Termos para indexação: Glycine max, biomassa, deficit hídrico, fotossíntese, nutrição. Physiological responses of soybean cultivars to potassium fertilization under different water regimesAbstract -The objective of this work was to evaluate the interference of potassium fertilization on the physiological parameters of soybean cultivars under different water regimes. The experiment was carried out in greenhouse at Presidente Prudente, SP, Brazil. The experimental design was a completely randomized block in a 2x2x3 factorial arrangement, with the soybean cultivars BR-16 (tolerante ...) and Embrapa 48 (suscept...), water regimes with daily replacements of 100% (control) and 40% of the field capacity, and three levels of K supplementation (0, 90, and 180 mg dm -3). Relative water content, photosynthetic potential, and biomass yield were evaluated two weeks after the initiation of water restriction. Plants grown under water restriction had their photosynthetic potential reevaluated after 12 h of rehydration. Under water restriction conditions, potassium fertilization did not significantly affect the assessed growth and physiological parameters. Supplementation with potassium promoted a better efficiency of the physiological parameters, in water deficit control, in both cultivars, and the main variables influenced by the nutrient were: stomatal conductance, maximum rate of Rubisco carboxylation, and maximum CO 2 assimilation. Potassium supplementation improves photosynthetic recovery of plants after rehydration, especially in the Embrapa 48 cultivar.Index terms: Glycine max, biomass, water deficit...

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Section: Introductionunclassified

Respostas fisiológicas de cultivares de soja à adubação potássica sob diferentes regimes hídricos

Catuchi

Guidorizzi

Guidorizi

et al. 2012

Pesq. agropec. bras.

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“…The total RNA of guard cells was sampled and extracted according to Langer et al (2004). For leaves, buds and flowers, the EZNA Plant RNA Mini Kit (Omega Bio-Tek, Norcross, GA, USA) was used, while RNA from extrafloral nectaries was isolated with the RNeasy MicroKit (Qiagen, Hilden, Germany).…”

Section: Rna Isolationmentioning

confidence: 99%

SLAH3‐type anion channel expressed in poplar secretory epithelia operates in calcium kinase CPK‐autonomous manner

Jaborsky¹,

Maierhofer²,

Olbrich³

et al. 2016

New Phytologist

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Summary Extrafloral nectaries secrete a sweet sugar cocktail that lures predator insects for protection from foraging herbivores. Apart from sugars and amino acids, the nectar contains the anions chloride and nitrate. Recent studies with Populus have identified a type of nectary covered by apical bipolar epidermal cells, reminiscent of the secretory brush border epithelium in animals. Border epithelia operate transepithelial anion transport, which is required for membrane potential and/or osmotic adjustment of the secretory cells. In search of anion transporters expressed in extrafloral nectaries, we identified PttSLAH3 (Populus tremula × Populus tremuloides SLAC1 Homologue3), an anion channel of the SLAC/SLAH family. When expressed in Xenopus oocytes, PttSLAH3 displayed the features of a voltage‐dependent anion channel, permeable to both nitrate and chloride. In contrast to the Arabidopsis SLAC/SLAH family members, the poplar isoform PttSLAH3 is independent of phosphorylation activation by protein kinases. To understand the basis for the autonomous activity of the poplar SLAH3, we generated and expressed chimera between kinase‐independent PttSLAH3 and kinase‐dependent Arabidopsis AtSLAH3. We identified the N‐terminal tail and, to a lesser extent, the C‐terminal tail as responsible for PttSLAH3 kinase‐(in)dependent action. This feature of PttSLAH3 may provide the secretory cell with a channel probably controlling long‐term nectar secretion.

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“…Potassium (K) fertilization can be considered as an alternative, which can minimize the deleterious effects caused by the high concentrations of salts in the water, because this macronutrient plays a key role in the osmotic regulation and promotes turgor maintenance in guard cells, which results in absorption of water by these cells and by adjacent cells and, consequently, generates more turgor and stomatal opening (Langer et al, 2004). Furthermore, it acts as osmoregulator, playing an essential role in water saving, cell turgor, carbohydrate transport and respiration (Shimazaki et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Potassium fertilization in the cultivation of colored cotton irrigated with saline water

Silva

Lima

Azevedo

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this study was to evaluate growth, flowering and production components of the cotton cv. 'BRS Topázio' irrigated with water of different salinity levels and potassium (K) doses in the soil. The research was conducted in a greenhouse. The experiment was set in a randomized complete block design with four replicates, in 4 x 4 factorial arrangement with 4 levels of irrigation water salinity (1.5, 3.0, 4.5 and 6.0 dS m -1 ) and four K doses (50, 75, 100 and 125% of the recommendation); the dose of 100% corresponded to 150 mg K 2 O kg -1 of soil. Irrigation water salinity reduced stem diameter, plant height, number of leaves and leaf area of the cotton cv. 'BRS Topázio' . Leaf area at 53 DAS was the most affected variable. The highest K dose associated with increased salinity of the irrigation water caused a more deleterious effect on the number of leaves and leaf area at 108 DAS. Progressive increases in irrigation water salinity proportionally increased flower abortion rate and, consequently, reduced the total number of bolls and seed weight of cotton.Adubação potássica no cultivo do algodoeiro de fibra colorida irrigado com águas salinas R E S U M O Objetivou-se neste trabalho avaliar crescimento, floração e os componentes de produção do algodoeiro cv. BRS Topázio em função da irrigação com águas de diferentes níveis de salinidade e doses de potássio no solo. A pesquisa foi conduzida em casa de vegetação. O delineamento experimental utilizado foi o de blocos casualizados em arranjo fatorial 4 x 4, com três repetições cujos tratamentos consistiram de quatro níveis de condutividade elétrica da água de irrigação (1,5; 3,0; 4,5 e 6,0 dS m -1 ) e quatro doses de potássio (50; 75; 100 e 125% da recomendação), sendo a dose de 100% correspondente a 150 mg K 2 O kg -1 de solo. A salinidade da água de irrigação reduziu o diâmetro de caule, altura de plantas, número de folhas e área foliar do algodoeiro, sendo a área foliar aos 53 dias após a semeadura (DAS) a variável mais afetada. As maiores doses de potássio associadas ao aumento da salinidade da água de irrigação proporcionaram um efeito depressivo no número de folhas e na área foliar aos 108 DAS. Aumentos progressivos da salinidade da água de irrigação elevaram, de forma proporcional, a taxa de abortamento de flores e, consequentemente, reduziram o número de capulhos total e a massa de algodão em caroço.

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The poplar K⁺ channel KPT1 is associated with K⁺ uptake during stomatal opening and bud development

Cited by 52 publications

References 48 publications

Respostas fisiológicas de cultivares de soja à adubação potássica sob diferentes regimes hídricos

Respostas fisiológicas de cultivares de soja à adubação potássica sob diferentes regimes hídricos

SLAH3‐type anion channel expressed in poplar secretory epithelia operates in calcium kinase CPK‐autonomous manner

Potassium fertilization in the cultivation of colored cotton irrigated with saline water

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The poplar K+ channel KPT1 is associated with K+ uptake during stomatal opening and bud development

Cited by 52 publications

References 48 publications

Respostas fisiológicas de cultivares de soja à adubação potássica sob diferentes regimes hídricos

Respostas fisiológicas de cultivares de soja à adubação potássica sob diferentes regimes hídricos

SLAH3‐type anion channel expressed in poplar secretory epithelia operates in calcium kinase CPK‐autonomous manner

Potassium fertilization in the cultivation of colored cotton irrigated with saline water

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The poplar K⁺ channel KPT1 is associated with K⁺ uptake during stomatal opening and bud development