Growth in continuous high air humidity increases the expression of CYP707A-genes and inhibits stomatal closure

Arve, Louise Elisabeth; Kruse, Ole Mathis Opstad; Tanino, Karen; Olsen, Jorunn E.; Futsæther, Cecilia Marie; Torre, Sissel

doi:10.1016/j.envexpbot.2015.02.004

Cited by 22 publications

(17 citation statements)

References 45 publications

(60 reference statements)

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“…A vascular site for water status sensing also would lead to much smaller stomatal responses to humidity than to source water status, for a given change in bulk leaf water status, because shifts in humidity cause much larger changes in water potential in the mesophyll than in the vasculature (due to hydraulic resistance distal to the xylem; Scoffoni et al, 2017). The role of ABA catabolism in stomatal responses to humidity is poorly known, except that both short-term exposure to high humidity and growth in sustained high humidity stimulate ABA catabolism (Arve et al, 2015).…”

Section: New Phytologistmentioning

confidence: 99%

How do stomata respond to water status?

2019

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Summary Stomatal responses to humidity, soil moisture and other factors that influence plant water status are critical drivers of photosynthesis, productivity, water yield, ecohydrology and climate forcing, yet we still lack a thorough mechanistic understanding of these responses. Here I review historical and recent advances in stomatal water relations. Clear evidence now implicates a metabolically mediated response to leaf water status (‘hydroactive feedback’) in stomatal responses to evaporative demand and soil drought, possibly involving abscisic acid production in leaves. Other hypothetical mechanisms involving vapor and heat transport within leaves may contribute to humidity, light and temperature responses, but require further theoretical clarification and experimental validation. Variation and dynamics in hydraulic conductance, particularly within leaves, may contribute to water status responses. Continuing research to fully resolve mechanisms of stomatal responses to water status should focus on several areas: validating and quantifying the mechanism of leaf‐based hydroactive feedback, identifying where in leaves water status is actively sensed, clarifying the role of leaf vapor and energy transport in humidity and temperature responses, and verifying foundational but minimally replicated results of stomatal hydromechanics across species. Clarity on these matters promises to deliver modelers with a tractable and reliable mechanistic model of stomatal responses to water status.

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Section: New Phytologistmentioning

confidence: 99%

How do stomata respond to water status?

2019

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“…CYP707A1 and CYP707A3, in particular, have been shown to have specific roles in regulating transpiration. Under high humidity, CYP707A1 is essential for the catabolism of local pools of ABA inside guard cells, while CYP707A3 is important for reducing levels of mobile ABA in vascular tissues (Okamoto et al ; Arve et al ). The resulting catabolite, 8′‐hydroxy‐ABA, is unstable and spontaneously isomerizes to phaseic acid (PA) (Saito et al ).…”

Section: Angiospermsmentioning

confidence: 99%

What are the evolutionary origins of stomatal responses to abscisic acid in land plants?

Sussmilch

Brodribb

McAdam

2017

JIPB

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The evolution of active stomatal closure in response to leaf water deficit, mediated by the hormone abscisic acid (ABA), has been the subject of recent debate. Two different models for the timing of the evolution of this response recur in the literature. A single-step model for stomatal control suggests that stomata evolved active, ABAmediated control of stomatal aperture, when these structures first appeared, prior to the divergence of bryophyte and vascular plant lineages. In contrast, a gradualistic model for stomatal control proposes that the most basal vascular plant stomata responded passively to changes in leaf water status. This model suggests that active ABA-driven mechanisms for stomatal responses to water status instead evolved after the divergence of seed plants, culminating in the complex, ABA-mediated responses observed in modern angiosperms. Here we review the findings that form the basis for these two models, including recent work that provides critical molecular insights into resolving this intriguing debate, and find strong evidence to support a gradualistic model for stomatal evolution.

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“…Despite the fact that in high relative humidity conditions the numbers of stomata and apertures increased, an in vitro cultured explant still could not get rid of excess water and alleviate flooding stress due to water vapour saturation. On the other hand, detached leaves of Arabidopsis developed under high relative humidity, although they produced more ABA, still suffered high water loss ex vitro (Arve et al 2015), which could be because of the ABA's inability to close the stomata both in vitro and ex vitro (Arve et al 2014). The negative effects of a closed chamber may be exacerbated by CKs.…”

Section: Resultsmentioning

confidence: 99%

“…The impaired transpiration can arise from hormone interactions and water vapour saturation, due to which the water vapour pressure gradient from plant to in vitro space will be minimal. Subsequently, the explant increases stomatal density (Carins Murphy et al 2014), stomatal apertures (Arve et al 2014), and abscisic acid (ABA) catabolism to mitigate the flooding stress (Arve et al 2015). Despite the fact that in high relative humidity conditions the numbers of stomata and apertures increased, an in vitro cultured explant still could not get rid of excess water and alleviate flooding stress due to water vapour saturation.…”

Section: Resultsmentioning

confidence: 99%

A robust method for haploid sugar beet in vitro proliferation and hyperhydricity reduction

Pazuki

Aflaki

Gürel

et al. 2017

Folia Horticulturae

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Sugar beet is recalcitrant to in vitro tissue culture. Usually, proliferation of in vitro cultured rosette explants is a prerequisite for micropropagation. Although hormonal treatments can induce proliferation in sugar beet rosette explants, they may also result in some side effects. In vitro culture of sugar beet explants and some hormonal treatments make them more prone to hyperhydricity. Effects of media with different concentrations of 6-benzylaminopurine (BAP) and kinetin (Kin) on the proliferation and hyperhydricity of haploid sugar beet explants were investigated. It was observed that 0.2 mg L -1 Kin, with a reasonable amount of proliferation and minimum rate of hyperhydricity, performed better than BAP in different concentrations and combinations. The effect sizes of the treatments on the dependent variables were large. The correlation between proliferation and hyperhydricity of the treated explants was statistically negative and the association was large. However, the hormonal treatments without BAP or with the lowest amount of it produced the highest proliferation rate with the least hyperhydricity. The coefficient of determination was R 2 quadratic = 0.885. The results suggest that, in comparison with BAP, Kin is a potent plant growth regulator for the proliferation of sugar beet haploid explants that causes the least hyperhydricity. Although explants proliferated better in the presence of 0.01 mg L -1 BAP in combination with Kin than under Kin alone, the hyperhydricity of the proliferated explants decreased their suitability for in vitro propagation.

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Growth in continuous high air humidity increases the expression of CYP707A-genes and inhibits stomatal closure

Cited by 22 publications

References 45 publications

How do stomata respond to water status?

How do stomata respond to water status?

What are the evolutionary origins of stomatal responses to abscisic acid in land plants?

A robust method for haploid sugar beet in vitro proliferation and hyperhydricity reduction

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