Central Roles for Potassium and Sucrose in Guard-Cell Osmoregulation

Talbott, Lawrence D.; Zeiger, Eduardo

doi:10.1104/pp.111.4.1051

Cited by 182 publications

(142 citation statements)

References 12 publications

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“…Our results for Experiment I (a rapid increase in K +, followed by a decline even as stomata remained open) are reminiscent of those reported by Talbott et al [21], whereas those of Experiment II (a less rapid increase in K ÷, which trailed the aperture-size increase) are reminiscent of those of Laffray et al [10]. The important role of K ÷ in stomatal movements [24] is unquestioned, but its role as the sole osmolyte that effects stomatal movements deserves reevaluation.…”

Section: Discussionsupporting

confidence: 78%

“…Intrigued by the reports that guard-cell potassium content declines over the diel cycle [20,21] and that changes in guardcell potassium content are not coordinated always with changes in stomatal aperture [8 11], we assayed semiquantitatively for K and CI in guard cells of growth-chamber-grown plants. Taken together, our semiquantitative elemental analyses revealed K and C1 fluctuations but the analyses did not show a reproducible correlation between the amounts of these elements and sucrose (or stomatal apertures).…”

Section: Symplastic Potassium and Chloride Contents Of Guard Cells Ovmentioning

confidence: 99%

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Sucrose: a solute that accumulates in the guard‐cell apoplast and guard‐cell symplast of open stomata

et al. 1995

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Stomatal conductances of Vicia faba leaves were recorded over a day. Coordinately, (a) guard cells dissected from leaflets were assayed, providing total sucrose content, and (b) guard cells dissected from rinsed epidermes were also assayed, providing symplastic sucrose content. Compared with that of pre-dawn samples, apoplastic sucrose content increased 4.8-5.2 × (2 experiments), reaching 1,130-1,300 fmol.guard-cell-pair -~ at midday, when conductance was highest (ca. 0.13 mol.m-2.s-~); symplastic sucrose content increased 2.5-3.5 ×, reaching 350-390 fmol" guard-cell-pair -1. Thus, there is a correlation between transpiration and guard-cell sucrose content, particularly that portion localized to the apoplast. Moreover, apoplastic sucrose is apparently a source of guard-cell nutrition and, possibly, osmoticum.

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Section: Discussionsupporting

confidence: 78%

Section: Symplastic Potassium and Chloride Contents Of Guard Cells Ovmentioning

confidence: 99%

Sucrose: a solute that accumulates in the guard‐cell apoplast and guard‐cell symplast of open stomata

et al. 1995

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“…Em contrapartida, o tratamento T5 apresentou os melhores resultados, no qual os valores de diâmetro e altura das mudas dispersaram em 1,5 e 7,0 mm, respectivamente, em relação à mediana. processo de fotossíntese, respiração e síntese de proteínas, atuando também na abertura estomática, no transporte via floema, na osmorregulação e na extensão celular (HuBeR, 1985;MaRSCHNeR, 1995;lavON e gOlDSHMiDt, 1999;talBOtt et al, 1999).…”

Section: Resultsunclassified

Efeito do resíduo de tanque de piscicultura na produção de mudas de maracujazeiro

Silva¹,

Melo²,

Botelho³

et al. 2017

Bol. Ind. Anim.

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mudas e produção de biomassa de maracujazeiro azedo amarelo cultivar redondo, produzidas a partir de resíduo proveniente de tanques de piscicultura. O experimento foi realizado em casa de vegetação, utilizando resíduo oriundo de tanques de piscicultura. Foram utilizados como substrato, solo de barranco (SB), resíduo proveniente de tanques de piscicultura (RP) e Tropstrato (TR). Os tratamentos foram: T1= testemunha constituída pelo substrato Tropstrato, T2: 25% RP + 75% SB, T3: 50% RP + 50% SB, T4: 25% SB + 75% RP e T5: 100% RP. Foi utilizado o delineamento experimental em blocos casualizados com 5 tratamentos, 4 repetições e 11 plantas por parcela. Observou-se que o tratamento T5 (100% resíduo de piscicultura) apresentou o maior número médio de folhas, maior produção de massa seca da parte aérea e maior acúmulo de massa seca da raiz (P<0,05). Os piores resultados ocorreram para o tratamento com 25% de resíduo proveniente de tanques de piscicultura (T2), o qual apresentou a menor uniformidade das variáveis estudadas. A altura do caule das plantas de maracujazeiro foi superior para os tratamentos que incluíram resíduo de piscicultura, sendo o T5 o tratamento com maior média de altura. Desta forma, o substrato à base de resíduo de tanque de piscicultura se mostrou mais benéfico para a produção de mudas de maracujazeiro amarelo cultivar redondo, se tornando uma boa alternativa para o aproveitamento deste resíduo.Palavras-chave: Passiflora edulis, massa, substrato. EFFECT OF THE REARING TANK RESIDUE OF FISH FARMS ON THE PRODUCTION OF PASSION FRUIT TREE SEEDLINGSABSTRACT: The objective of this study was to evaluate the initial growth of seedlings and biomass production of blue and yellow passion fruit trees (round cultivar) produced from residue of the rearing tanks of fish farms. The experiment was conducted in a greenhouse using residue obtained from fish farming tanks. Ravine soil (RS), fish tank residue (FR) and Tropstrato (TR) were used as substrate. The treatments were: T1 = control consisting of Tropstrato substrate; T2: 25% FR + 75% RS; T3: 50% FR + 50% RS; T4: 25% RS + 75% FR; T5: 100% FR. A completely randomized block design consisting of 5 treatments, 4 replicates and 11 plants per plot was used. Treatment T5 (100% fish farming residue) resulted in the largest average number of leaves, highest dry matter production of the aerial part, and highest dry matter accumulation in the root (P<0.05). The worst results were obtained for the treatment using 25% FR (T2), which resulted in less uniformity of the variables studied. Stem height of the passion fruit tree was greater for the treatments that included FR, with the greatest mean height being observed for T5. The substrate using the residue of fish farming tanks was found to be beneficial to produce yellow passion fruit seedlings (round cultivar), representing a good alternative for the reutilization of this residue.

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“…Salt is known to reduce K uptake (Cramer et al, 1987). Low K levels can reduce photosynthetic performance (Chow et al, 1990) and stomatal control of water loss (Talbott & Zeiger, 1996). Several Danish and Swedish authors including Saxe (1993) suggested that tropospheric ozone could also be a contributing factor in the recent outbreak of the ' top dying ' syndrome.…”

Section: mentioning

confidence: 99%

Response to three seasons of elevated ozone in the progeny of healthy and unhealthy Norway spruce trees from a plantation with the ‘top dying’ syndrome

1999

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We tested a hypothesis that elevated ozone was an eliciting or contributing factor in outbreaks of the ' top dying ' (or ' subtop dying ') syndrome in Norway spruce (Picea abies). Progeny were used from open-pollinated trees within a stand with the ' top dying ' syndrome. The mother trees were classified in relation to the expression of the ' top dying ' syndrome, and progeny from the healthiest and least healthy thirds of the population were exposed to high and low concentrations of ozone for three seasons. Elevated ozone did not affect height growth of the trees. It did not measurably affect net photosynthesis, stomatal conductance or instantaneous water use efficiency. Chlorophyll and carotenoid contents were also not significantly affected by ozone concentration. In the first year, instantaneous water use efficiency was lower in the progeny of the unhealthy mother trees than in the healthy mother trees. Furthermore, the unhealthy mother trees tended to produce longer annual shoots and showed more winter damage at the end of the experiment. None of these parameters were related to ozone concentration in the atmosphere. These results do not support a hypothesis that elevated ozone is a significant contributory factor or an eliciting factor in the development of the syndrome.

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Central Roles for Potassium and Sucrose in Guard-Cell Osmoregulation

Cited by 182 publications

References 12 publications

Sucrose: a solute that accumulates in the guard‐cell apoplast and guard‐cell symplast of open stomata

Sucrose: a solute that accumulates in the guard‐cell apoplast and guard‐cell symplast of open stomata

Efeito do resíduo de tanque de piscicultura na produção de mudas de maracujazeiro

Response to three seasons of elevated ozone in the progeny of healthy and unhealthy Norway spruce trees from a plantation with the ‘top dying’ syndrome

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