Passive and active stomatal control: either or both?

Franks, Peter J.

doi:10.1111/nph.12228

Cited by 56 publications

(39 citation statements)

References 16 publications

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“…On the one hand, lycophyte and fern stomata were shown to lack active responses to endogenous ABA, leading to the conclusion that the guard cell ABA-signaling system developed rather late in evolution of angiosperms, after the divergence of ferns [36,37]. On the other hand, the targeted knockout of the PpOST1-1 gene in Physcomitrella patens [32] and cross-species complementation studies have shown that the Physcomitrella patens SnR kinase PpOST1.1 is able to restore the ABA response in the stomata of AtOST1-deficient Arabidopsis plants [33,38]. This suggested that the core regulatory components involved in guard cell ABA signaling of flowering plants are functional in mosses and likely originated in the LCA of these lineages [32,33], prior to the evolution of ferns.…”

Section: Stomatal Guard Cells Use the Ancient Aba-dependent Snr Kinasmentioning

confidence: 96%

Stomatal Guard Cells Co-opted an Ancient ABA-Dependent Desiccation Survival System to Regulate Stomatal Closure

et al. 2015

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During the transition from water to land, plants had to cope with the loss of water through transpiration, the inevitable result of photosynthetic CO2 fixation on land [1, 2]. Control of transpiration became possible through the development of a new cell type: guard cells, which form stomata. In vascular plants, stomatal regulation is mediated by the stress hormone ABA, which triggers the opening of the SnR kinase OST1-activated anion channel SLAC1 [3, 4]. To understand the evolution of this regulatory circuit, we cloned both ABA-signaling elements, SLAC1 and OST1, from a charophyte alga, a liverwort, and a moss, and functionally analyzed the channel-kinase interactions. We were able to show that the emergence of stomata in the last common ancestor of mosses and vascular plants coincided with the origin of SLAC1-type channels capable of using the ancient ABA drought signaling kinase OST1 for regulation of stomatal closure.

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Section: Stomatal Guard Cells Use the Ancient Aba-dependent Snr Kinasmentioning

confidence: 96%

Stomatal Guard Cells Co-opted an Ancient ABA-Dependent Desiccation Survival System to Regulate Stomatal Closure

et al. 2015

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“…The latter authors also reported that seedless plants were insensitive to ABA (Brodribb & McAdam, ; McAdam & Brodribb, 2012b). Together, this evidence suggests that the short‐term hydroactive feedback response to leaf water status is weak or absent in seedless plants, and is stronger in angiosperms due to the need to overcome a greater mechanical advantage (Franks, ). Brodribb & McAdam () speculated further that stomatal sensitivity to ABA evolved in angiosperms for this reason.…”

Section: New Ideas and New Evidence About Stomatal Responses To Watermentioning

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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“…A completely different pattern was observed in the fellow Cupressaceae species Callitris rhombiodea, in which stomatal control shifted from ABA-mediated closure to passive hydraulic control under severe water stress, thereby enabling an anisohydric stomatal closure response during soil drying (Brodribb and McAdam, 2013a). From these few examples, it is clear that the combination of active and passive regulation of stomatal aperture provides a large scope for adaptive variation in stomatal response and plant water management during drought (Franks, 2013). Combined with variation in the plant hydraulic system and plant allocation, a picture is emerging of how plants are able to adapt to changes in water availability, starting with the dynamic control of g s .…”

Section: Implications For Diversity In Stomatal Control Of Conifersmentioning

confidence: 99%

Separating Active and Passive Influences on Stomatal Control of Transpiration

2014

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Motivated by studies suggesting that the stomata of ferns and lycophytes do not conform to the standard active abscisic acid (ABA) -mediated stomatal control model, we examined stomatal behavior in a conifer species (Metasequoia glyptostroboides) that is phylogenetically midway between the fern and angiosperm clades. Similar to ferns, daytime stomatal closure in response to moderate water stress seemed to be a passive hydraulic process in M. glyptostroboides immediately alleviated by rehydrating excised shoots. Only after prolonged exposure to more extreme water stress did active ABA-mediated stomatal closure become important, because foliar ABA production was triggered after leaf turgor loss. The influence of foliar ABA on stomatal conductance and stomatal aperture was highly predictable and additive with the passive hydraulic influence. M. glyptostroboides thus occupies a stomatal behavior type intermediate between the passively controlled ferns and the characteristic ABA-dependent stomatal closure described in angiosperm herbs. These results highlight the importance of considering phylogeny as a major determinant of stomatal behavior.

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Passive and active stomatal control: either or both?

Cited by 56 publications

References 16 publications

Stomatal Guard Cells Co-opted an Ancient ABA-Dependent Desiccation Survival System to Regulate Stomatal Closure

Stomatal Guard Cells Co-opted an Ancient ABA-Dependent Desiccation Survival System to Regulate Stomatal Closure

How do stomata respond to water status?

Separating Active and Passive Influences on Stomatal Control of Transpiration

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