Levels of (±) Abscisic Acid and Xanthoxin in Spinach under Different Environmental Conditions

Zeevaart, Jan A. D.

doi:10.1104/pp.53.4.644

Cited by 51 publications

(22 citation statements)

References 13 publications

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“…Air humidity has been shown to affect stomatal morphology and responsiveness in various angiosperm species. High relative air humidity during growth has been associated with longer and more open stomata (Torre et al, 2003;Nejad and van Meeteren, 2005;Fanourakis et al, 2011;Aliniaeifard et al, 2014), lower levels of ABA (Zeevaart, 1974;Nejad and van Meeteren, 2007;Okamoto et al, 2009;Aliniaeifard et al, 2014), and decreased stomatal responsiveness to ABA (Pospíšilová, 1996;Fanourakis et al, 2013;Pantin et al, 2013b;Arve et al, 2014). Exposure to low RH can enhance stomatal ABA responsiveness in young leaves that are constantly in a microenvironment with high RH (Pantin et al, 2013b).…”

Section: Resultsmentioning

confidence: 99%

Fern Stomatal Responses to ABA and CO₂ Depend on Species and Growth Conditions

2017

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, climate, and air humidity affect plant gas exchange that is controlled by stomata, small pores on plant leaves and stems formed by guard cells. Evolution has shaped the morphology and regulatory mechanisms governing stomatal movements to correspond to the needs of various land plant groups over the past 400 million years. Stomata close in response to the plant hormone abscisic acid (ABA), elevated CO 2 concentration, and reduced air humidity. Whether the active regulatory mechanisms that control stomatal closure in response to these stimuli are present already in mosses, the oldest plant group with stomata, or were acquired more recently in angiosperms remains controversial. It has been suggested that the stomata of the basal vascular plants, such as ferns and lycophytes, close solely hydropassively. On the other hand, active stomatal closure in response to ABA and CO 2 was found in several moss, lycophyte, and fern species. Here, we show that the stomata of two temperate fern species respond to ABA and CO 2 and that an active mechanism of stomatal regulation in response to reduced air humidity is present in some ferns. Importantly, fern stomatal responses depend on growth conditions. The data indicate that the stomatal behavior of ferns is more complex than anticipated before, and active stomatal regulation is present in some ferns and has possibly been lost in others. Further analysis that takes into account fern species, life history, evolutionary age, and growth conditions is required to gain insight into the evolution of land plant stomatal responses.

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Section: Resultsmentioning

confidence: 99%

Fern Stomatal Responses to ABA and CO₂ Depend on Species and Growth Conditions

2017

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“…On the other hand, information of physiological roles of ABA metabolism and its regulatory mechanism in response to high humidity is limited. Previous reports described that endogenous ABA levels in leaves grown under high humidity was lower than under moderate humidity (Zeevaart, 1974;van Meeteren, 2007, 2008). However, these previous reports studied the effect of the long term under high humidity.…”

Section: Cyp707a1 Is Essential For Aba Catabolism Inside Guard Cellsmentioning

confidence: 99%

“…Humidity is also known to affect endogenous ABA levels. In spinach (Spinacia oleracea) and Tradescantia virginiana, ABA levels were lower in leaves grown in high-humidity conditions, compared with those grown in moderate humidity conditions (Zeevaart, 1974;van Meeteren, 2007, 2008). In contrast to recent progress in understanding the regulation of ABA biosynthesis, our knowledge of ABA catabolism in response to environmental cues is still limited.…”

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confidence: 99%

High Humidity Induces Abscisic Acid 8′-Hydroxylase in Stomata and Vasculature to Regulate Local and Systemic Abscisic Acid Responses in Arabidopsis

Okamoto

Tanaka²,

Abrams³

et al. 2008

Plant Physiol.

228

190

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Levels of endogenous abscisic acid (ABA) are changed dynamically in response to environmental conditions. The ABA 8#-hydroxylase is a key enzyme in ABA catabolism and is encoded by CYP707A genes. In this study, we examined physiological roles of Arabidopsis (Arabidopsis thaliana) CYP707As in the plant's response to changes in humidity. The cyp707a1 and cyp707a3 mutants displayed lower stomatal conductance under turgid conditions (relative humidity 60%) than the wild type. When wild-type plants were transferred to high-humidity conditions (relative humidity 90%), CYP707A1 and CYP707A3 transcript levels increased, followed by the reduction of ABA levels. The cyp707a3 mutant exhibited high ABA levels even after transferring to high-humidity conditions, whereas, under similar conditions, the cyp707a1 mutant exhibited low ABA levels comparable to the wild type. Analysis of spatial expression patterns by using transgenic plants harboring a promoter:: b-glucuronidase gene indicated that high-humidity-induced expression of CYP707A1 and CYP707A3 occurred primarily in guard cells and vascular tissues, respectively. Furthermore, stomatal closure of the cyp707a1 mutant, but not cyp707a3 mutant, was ABA hypersensitive when epidermal peel was treated with exogenous ABA, suggesting that CYP707A1 is essential for ABA catabolism inside the guard cells. These results implicate that CYP707A3 reduces the amount of mobile ABA in vascular tissues in response to high humidity, whereas CYP707A1 inactivates local ABA pools inside the guard cells. Taken together, ABA catabolism in both vascular tissues and guard cells participates in the systemic ABA action that controls stomatal movement in response to high humidity.

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“…For example, flooding (10), fruit removal or stem girdling (1 1, 20), long photoperiod (22), ' 29'C and 100% RH as previously described (2,5,12,14). The following seedling sections were defined: hook and the zone of elongation the first 5 mm and next 15 mm along the hypocotyl below the cotyledon with the mature region of the hypocotyl the remaining portion of the hypocotyl.…”

mentioning

confidence: 99%

Abscisic Acid Accumulates at Positive Turgor Potential in Excised Soybean Seedling Growing Zones

Creelman

Mullet²

1991

Plant Physiol.

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Levels of (±) Abscisic Acid and Xanthoxin in Spinach under Different Environmental Conditions

Abstract: The levels of the growth inhibitors (+) -abscisic acid and xanthoxin were determined in the long day plant spinach (Spinacia oleracea L. cv

Cited by 51 publications

References 13 publications

Fern Stomatal Responses to ABA and CO₂ Depend on Species and Growth Conditions

Fern Stomatal Responses to ABA and CO₂ Depend on Species and Growth Conditions

High Humidity Induces Abscisic Acid 8′-Hydroxylase in Stomata and Vasculature to Regulate Local and Systemic Abscisic Acid Responses in Arabidopsis

Abscisic Acid Accumulates at Positive Turgor Potential in Excised Soybean Seedling Growing Zones

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Levels of (±) Abscisic Acid and Xanthoxin in Spinach under Different Environmental Conditions

Abstract: The levels of the growth inhibitors (+) -abscisic acid and xanthoxin were determined in the long day plant spinach (Spinacia oleracea L. cv

Cited by 51 publications

References 13 publications

Fern Stomatal Responses to ABA and CO2 Depend on Species and Growth Conditions

Fern Stomatal Responses to ABA and CO2 Depend on Species and Growth Conditions

High Humidity Induces Abscisic Acid 8′-Hydroxylase in Stomata and Vasculature to Regulate Local and Systemic Abscisic Acid Responses in Arabidopsis

Abscisic Acid Accumulates at Positive Turgor Potential in Excised Soybean Seedling Growing Zones

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Fern Stomatal Responses to ABA and CO₂ Depend on Species and Growth Conditions

Fern Stomatal Responses to ABA and CO₂ Depend on Species and Growth Conditions