Leaf K<sup>+</sup> Interaction with Water Stress Inhibition of Nonstomatal-Controlled Photosynthesis

Berkowitz, Gerald A.; Whalen, Christa

doi:10.1104/pp.79.1.189

Cited by 30 publications

(16 citation statements)

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“…Photosynthetic rates decreased with the first decrease in water potential, and at -3.11 MPa rates had decreased by 35% from the highest rate at 0 MPa. Berkowitz and Whalen (5) found that photosynthesis of leaf slices from spinach depleted of K4 was more susceptible to dehydration than control plants, similar to the results with wheat found here. The 2 mM K+-grown wheat was also sensitive to dehydration, although less so than the 0.…”

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confidence: 80%

“…These data suggest that suboptimal pH of the stroma during water stress was inhibiting photosynthesis. Last, the K4 protective effect appears to be extrachloroplastic, since chloroplasts isolated from control and K+-deficient plants were inhibited to the same extent by decreased '.. of the assay solution (5).…”

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confidence: 99%

“…Inhibition of photosynthesis of isolated chloroplasts in hypertonic medium was partially reversed by addition of K+ and NH4Cl (2, 3), which raise stromal pH (13,20). Berkowitz and Whalen (5) found that photosynthesis of leaf slices prepared from K+-deficient spinach was more sensitive to in vitro dehydration than leaf slices of control plants. The response of K+ appeared to be mediated by extrachloroplastic factors, since dehydration inhibited photosynthesis of chloroplasts isolated from control and K+-deficient plants to the same degree.…”

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Modulation of Water Stress Effects on Photosynthesis by Altered Leaf K⁺

Pier¹,

Berkowitz²

1987

Plant Physiol.

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Wheat irrigated with nutrient solutions containing 0, 0.2, 0.5, 1, 2, or 6 millimolar K' had maximum photosynthetic rates at 1 to 2 millimolar K+ concentrations. Rates in the 6 millimolar Ktgrown plants were not higher than the 2 millimolar K -grown wheat, and rates were inhibited below 0.5 millimolar KV. Photosynthesis was measured by both attached whole leaf CO2 uptake and by '4C02 fixation of leaf slices in solution.Exposure of leaf slices from 0.2, 2, and 6 millimolar K-grown wheat to various assay media water potentials showed that photosynthesis of the 0.2 millimolar K+-grown wheat decreased from control (high water potential) rates by 35%, that of the 2 millimolar K-grown wheat by 20.4%, and that of the 6 millimolar K+-grown wheat by only 83% at -3.11 megapascals. Also, photosynthesis of the 6 millimolar K+-grown wheat was enhanced by 28% over that of the 2 millimolar K+ wheat at the most severe water stress (-3.11 megapascals), indicating that the excess leaf K+ in the 6 millimolar K+-grown wheat partially reversed dehydration effects on photosynthesis. Oligomycin eliminated the protective effects of high K+ on photosynthesis in dehydrated leaf slices. These results suggest that the protective effect of high K+ under water stress may involve the exchange of K+ in the cytoplasm for stroma H+, thus altering stromal pH and restoring photosynthesis. The protective effect of high K+ was also observed in attached whole leaf photosynthesis of in situ water-stressed wheat grown on 0.2, 2, and 6 millimolar KV. Under water stress, rates of the 6 millimolar K+-grown wheat were enhanced by 66.2% and 113.9% over that of 2 millimolar K+-grown wheat in two separate experiments. Internal CO2 concentration of the 6 millimolar K'-grown wheat was lower than that of the 0.2 and 2 millimolar K+-grown wheat. These results suggest that the high K+ effects on chloroplast photosynthesis seen in leaf slices also occur at the whole plant level.Inhibition of photosynthesis in isolated chloroplasts, protoplasts, and leaf slices by dehydration in hypertonic solutions (4,16) diating water stress inhibition of the photosynthetic process.One line of evidence suggests that the stromal pH is too low to support optimal photosynthetic rates in dehydrated plastids, and that cellular processes which facilitate stromal alkalization may modulate stress effects on chloroplasts. Inhibition of photosynthesis of isolated chloroplasts in hypertonic medium was partially reversed by addition of K+ and NH4Cl (2, 3), which raise stromal pH (13,20

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Modulation of Water Stress Effects on Photosynthesis by Altered Leaf K⁺

Pier¹,

Berkowitz²

1987

Plant Physiol.

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“…Previous work in this laboratory (6,17) (6,17), they found no effect of altered K+ status on C02-and light-saturated photosynthesis. However, Rao et al indicated that due to variability in the leaf K+ content in their experiments, they could not completely rule out a role of K+ in alleviating stress effects on chloroplasts.…”

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Maintenance of Photosynthesis at Low Leaf Water Potential in Wheat

Gupta¹,

Berkowitz²,

Pier³

1989

Plant Physiol.

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102

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The interaction of low water potential effects on photosynthesis, and leaf K+ levels in wheat (Tritcum aestivum L.) plants was studied. Plants were grown at three K+ fertilization levels; 0.2, 2, and 6 millimolar. With well watered plants, 2 millimolar K+ supported maximal photosynthetic rates; 0.2 millimolar K+ was inhibitory, and 6 millimolar K+ was superoptimal (i.e. rates were no greater than at 2 millimolar K ). Photosynthesis was monitored at high (930 parts per million) and low (330 parts per million) extemal CO2 throughout a series of water stress cycles. Plants subjected to one stress cycle were considered nonacclimated; plants subjected to

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“…In addition, under water stress, amongst others types of stress, there is a greater reactive oxygen species production (HASEGAWA et al, 2000), which increases the demand for K and induces its high accumulation in plant tissues (BERKOWITZ;CHRISTA, 1985). Adequate amounts of K reduces NADPH oxidase activity, which represents the second major source for ROS production, and protect chloroplasts as ROS production is restricted (CAKMAK, 2005).…”

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Effects of potassium application and soil moisture on the growth of Corymbia citriodora plants

Sá

Valeri

Cruz

et al. 2014

CERNE

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ABSTRACT:The objective of this work was to evaluate the effects of potassium and soil moisture levels on the growth of Corymbia citriodora plants. Four doses of potassium were applied (0, 40, 80 and 120 mg . dm -3 ) and three soil moisture levels were established (50-80%, 65-80% and 80% of maximum soil field capacity). The experiment was a 4 x 3 factorial arrangement of treatments within a randomized complete design with six replications for each treatment and one pot with two plants for each plot. At 90 days after planting, the plant growth parameters: survival rate, height, stem diameter, leaf area, relative chlorophyll concentration, leaf dry mass, stem and branches dry mass, root dry mass, total dry mass and leaf macronutrient contents were measured. High soil moisture content is necessary for Corymbia citriodora seedlings at nursery stage. Effects of the K doses were not observed in plants, even when they were cultivated in a soil with a low content of this nutrient. EFEITOS DA APLICAÇÃO DE POTÁSSIO E UMIDADES DO SOLO NO CRESCIMENTO DE PLANTAS DE Corymbia citriodora RESUMO:Conduziu-se este trabalho, com o objetivo de avaliar os efeitos de doses de potássio e umidades do solo no crescimento de plantas de Corymbia citriodora. Foram aplicadas quatro doses de potássio (0, 40, 80, e 120 mg . dm -3 ) e promovidas três níveis de umidades do solo (50-80%, 65-80% e 80% do volume máximo de água retido pelo solo em vaso), combinadas em um esquema fatorial 4x3. O delineamento experimental foi inteiramente casualizado com seis repetições, e cada parcela foi composta por um vaso contendo duas plantas. Aos 90 dias após o plantio, foram avaliados: porcentagem de sobrevivência, altura, diâmetro do caule, área foliar, teor relativo de clorofila, massa de matéria seca de folhas, de caule e ramos, de raízes e total, e teor de macronutrientes nas folhas. Mudas de Corymbia citriodora necessitam de alta umidade do solo na fase de viveiro. Não foram observados efeitos das doses de potássio nas plantas, mesmo quando a concentração desse nutriente no solo era baixa.

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Leaf K⁺ Interaction with Water Stress Inhibition of Nonstomatal-Controlled Photosynthesis

Cited by 30 publications

References 20 publications

Modulation of Water Stress Effects on Photosynthesis by Altered Leaf K⁺

Modulation of Water Stress Effects on Photosynthesis by Altered Leaf K⁺

Maintenance of Photosynthesis at Low Leaf Water Potential in Wheat

Effects of potassium application and soil moisture on the growth of Corymbia citriodora plants

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Leaf K+ Interaction with Water Stress Inhibition of Nonstomatal-Controlled Photosynthesis

Cited by 30 publications

References 20 publications

Modulation of Water Stress Effects on Photosynthesis by Altered Leaf K+

Modulation of Water Stress Effects on Photosynthesis by Altered Leaf K+

Maintenance of Photosynthesis at Low Leaf Water Potential in Wheat

Effects of potassium application and soil moisture on the growth of Corymbia citriodora plants

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Product

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Leaf K⁺ Interaction with Water Stress Inhibition of Nonstomatal-Controlled Photosynthesis

Modulation of Water Stress Effects on Photosynthesis by Altered Leaf K⁺

Modulation of Water Stress Effects on Photosynthesis by Altered Leaf K⁺