Hormonal dynamics contributes to divergence in seasonal stomatal behaviour in a monsoonal plant community

McAdam, Scott A. M.; Brodribb, Timothy J.

doi:10.1111/pce.12398

Cited by 22 publications

(19 citation statements)

References 57 publications

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“…Under natural changes in VPD, the seasonal dynamics of stomatal behaviour were predictable functions of ABA concentration in a cycad (McAdam & Brodribb ). In immature leaves produced during the dry season, high foliar ABA concentrations ensure that stomata remain closed until the wet season, when foliar ABA declines and stomata open (McAdam & Brodribb ). These findings clearly point to a central role of foliar ABA biosynthesis in mechanistic models of stomatal behaviour (Buckley ).…”

Section: Discussionmentioning

confidence: 99%

“…Second, ABA biosynthesis itself may become less sensitive to VPD. Differences in ABA sensitivity have been observed among species (Brodribb & McAdam ; McAdam & Brodribb ) and, if possible within a single species, could drive stomatal acclimation. Third, plants could maintain a high level of leaf hydration at high VPD through changes in plant architecture.…”

Section: Discussionmentioning

confidence: 99%

“…This closes stomata and is mediated by upregulation of a single gene in the ABA biosynthetic pathway (McAdam et al 2016). Under natural changes in VPD, the seasonal dynamics of stomatal behaviour were predictable functions of ABA concentration in a cycad (McAdam & Brodribb 2015). In immature leaves produced during the dry season, high foliar ABA concentrations ensure that stomata remain closed until the wet season, when foliar ABA declines and stomata open (McAdam & Brodribb 2015).…”

Section: Mechanisms Of Stomatal Acclimationmentioning

confidence: 99%

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Stomatal acclimation to vapour pressure deficit doubles transpiration of small tree seedlings with warming

Marchin

Broadhead

Bostic

et al. 2016

Plant Cell & Environment

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Future climate change is expected to increase temperature (T) and atmospheric vapour pressure deficit (VPD) in many regions, but the effect of persistent warming on plant stomatal behaviour is highly uncertain. We investigated the effect of experimental warming of 1.9-5.1 °C and increased VPD of 0.5-1.3 kPa on transpiration and stomatal conductance (gs ) of tree seedlings in the temperate forest understory (Duke Forest, North Carolina, USA). We observed peaked responses of transpiration to VPD in all seedlings, and the optimum VPD for transpiration (Dopt ) shifted proportionally with increasing chamber VPD. Warming increased mean water use of Carya by 140% and Quercus by 150%, but had no significant effect on water use of Acer. Increased water use of ring-porous species was attributed to (1) higher air T and (2) stomatal acclimation to VPD resulting in higher gs and more sensitive stomata, and thereby less efficient water use. Stomatal acclimation maintained homeostasis of leaf T and carbon gain despite increased VPD, revealing that short-term stomatal responses to VPD may not be representative of long-term exposure. Acclimation responses differ from expectations of decreasing gs with increasing VPD and may necessitate revision of current models based on this assumption.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Mechanisms Of Stomatal Acclimationmentioning

confidence: 99%

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Stomatal acclimation to vapour pressure deficit doubles transpiration of small tree seedlings with warming

Marchin

Broadhead

Bostic

et al. 2016

Plant Cell & Environment

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“…ABA synthesis in roots and its transport to the leaves has been considered the main signalling pathway transducing soil water status [ 21 – 23 ] because of the correlation between stomatal conductance and ABA concentration in xylem sap [ 24 – 26 ]. In addition, hydraulic signals could modulate stomatal closure either directly, and/or via ABA production in the leaf [ 9 , 27 ]. Furthermore, recent studies suggest that the extent to which stomatal conductance is controlled by either hydraulic signals, ABA or their interaction could be associated with genetic differences in responses to drought [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

ABA-mediated responses to water deficit separate grapevine genotypes by their genetic background

et al. 2016

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BackgroundABA-mediated processes are involved in plant responses to water deficit, especially the control of stomatal opening. However in grapevine it is not known if these processes participate in the phenotypic variation in drought adaptation existing between genotypes. To elucidate this question, the response to short-term water-deficit was analysed in roots and shoots of nine Vitis genotypes differing in their drought adaptation in the field. The transcript abundance of 12 genes involved in ABA biosynthesis, catabolism, and signalling were monitored, together with physiological and metabolic parameters related to ABA and its role in controlling plant transpiration.ResultsAlthough transpiration and ABA responses were well-conserved among the genotypes, multifactorial analyses separated Vitis vinifera varieties and V. berlandieri x V. rupestris hybrids (all considered drought tolerant) from the other genotypes studied. Generally, V. vinifera varieties, followed by V. berlandieri x V. rupestris hybrids, displayed more pronounced responses to water-deficit in comparison to the other genotypes. However, changes in transcript abundance in roots were more pronounced for Vitis hybrids than V. vinifera genotypes. Changes in the expression of the cornerstone ABA biosynthetic gene VviNCED1, and the ABA transcriptional regulator VviABF1, were associated with the response of V. vinifera genotypes, while changes in VviNCED2 abundance were associated with the response of other Vitis genotypes. In contrast, the ABA RCAR receptors were not identified as key components of the genotypic variability of water-deficit responses. Interestingly, the expression of VviSnRK2.6 (an AtOST1 ortholog) was constitutively lower in roots and leaves of V. vinifera genotypes and higher in roots of V. berlandieri x V. rupestris hybrids.ConclusionsThis study highlights that Vitis genotypes exhibiting different levels of drought adaptation differ in key steps involved in ABA metabolism and signalling; both under well-watered conditions and in response to water-deficit. In addition, it supports that adaptation may be related to various mechanisms related or not to ABA responses.Electronic supplementary materialThe online version of this article (doi:10.1186/s12870-016-0778-4) contains supplementary material, which is available to authorized users.

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“…Attempts to advance cycad biology research are diminished when articles containing data on cycads are published without sufficient titles or keywords (e.g., Beaton 1991;Wright & Westoby 2003;McAdam & Brodribb 2015). Numerous articles from the medical literature have been published on neurodegeneration and included administration of the cycad tissue to test subjects.…”

Section: Discussionmentioning

confidence: 99%

Publishing trends for the Cycadales, the most threatened plant group

Cascasan

Marler

2016

J. Threat. Taxa

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Hormonal dynamics contributes to divergence in seasonal stomatal behaviour in a monsoonal plant community

Cited by 22 publications

References 57 publications

Stomatal acclimation to vapour pressure deficit doubles transpiration of small tree seedlings with warming

Stomatal acclimation to vapour pressure deficit doubles transpiration of small tree seedlings with warming

ABA-mediated responses to water deficit separate grapevine genotypes by their genetic background

Publishing trends for the Cycadales, the most threatened plant group

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