Surviving a Dry Future: Abscisic Acid (ABA)-Mediated Plant Mechanisms for Conserving Water under Low Humidity

Sussmilch, Frances C.; McAdam, Scott A. M.

doi:10.3390/plants6040054

Cited by 28 publications

(15 citation statements)

References 237 publications

(290 reference statements)

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“…Gymnosperms show stomatal closure in response to endogenous ABA levels and synthesise ABA after exposure to sustained dehydration stress/drought [76,81,82]. This suggests that ABA-dependent stomatal responses to drought stress were already present in an early seed plant ancestor [83]. However, ABA synthesis is slower in gymnosperms, occurring only after hours to days of sustained water stress, and gymnosperm responses to low air humidity are instead proposed to be hydropassive and ABA-independent ( [84,85], cf.…”

Section: Aba-induced Stomatal Closurementioning

confidence: 99%

Acquiring Control: The Evolution of Stomatal Signalling Pathways

Sussmilch

Schultz

Hedrich

et al. 2019

Trends in Plant Science

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Recent studies have revealed considerable differences in stomatal function between bryophytes and vascular plants. Bryophyte stomata, which are limited to sporangia, appear to function predominantly to promote water loss for spore desiccation and develop mechanical restrictions that prevent stomatal closure when they mature [6,8-11]. Fossils of extinct nonvascular plants with similar characteristics, indicate that these features are ancestral [9,12]. In contrast to bryophyte stomata, vascular plant stomata remain flexible throughout development [11,13], enabling them to close during unfavourable conditions like drought, and restrict plant water loss. This suggests that, prior to lycophyte divergence, there was a shift in the role of stomata from promoting spore desiccation, to preventing water loss in vegetative tissues. In addition, stomata in vascular plants play a major role in CO 2 uptake, while the importance of stomata for CO 2 acquisition in bryophytes is currently debated [2,9,14]. Highlights Recent findings reveal that stomata function differently in mosses and hornworts than in vascular plants, with bryophyte stomata promoting rather than preventing water loss.

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Section: Aba-induced Stomatal Closurementioning

confidence: 99%

Acquiring Control: The Evolution of Stomatal Signalling Pathways

Sussmilch

Schultz

Hedrich

et al. 2019

Trends in Plant Science

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“…This situation will be exacerbated by increasing global population, urbanization and industrialization of occupied arable land, land degradation and desertification [ 8 , 9 ]. Climate change will continue to limit water availability through increased temperature and the frequency and/or severity of droughts [ 10 – 12 ]. Therefore, agricultural productivity faces a greater challenge in fighting drought stress.…”

Section: Introductionmentioning

confidence: 99%

Transcriptomic analysis of drought stress responses of sea buckthorn (Hippophae rhamnoidessubsp. sinensis) by RNA-Seq

Gui-sheng¹,

Ma²,

Feng³

et al. 2018

PLoS ONE

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Sea buckthorn is one of the most important eco-economic tree species in China due to its ability to grow and produce acceptable yields under limited water and fertilizer availability. In this study, the differentially expressed genes under drought stress (DS) of sea buckthorn were identified and compared with control (CK) by RNA-Seq. A total of 122,803 unigenes were identified in sea buckthorn, and 70,025 unigenes significantly matched a sequence in at least one of the seven databases. A total of 24,060 (19.59%) unigenes can be assigned to 19 KEGG pathways, and 1,644 unigenes were differentially expressed between DS and CK, of which 519 unigenes were up-regulated and 1,125 unigenes down-regulated. Of the 47 significantly enriched GO terms, 14, 7 and 26 items were related to BP, CC and MF, respectively. KEGG enrichment analysis showed 398 DEGs involved in 97 different pathways, of which 119 DEGs were up-regulated and 279 DEGs were down-regulated under drought stress. In addition, we found 4438 transcriptor factors (TFs) in sea buckthorn, of which 100 were differentially expressed between DS and CK. These results lay a first foundation for further investigations of the very specific functions of these unigenes in sea buckthorn in response to drought stress.

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“…For this reason, expression of MtNCED (9‐cis‐epoxycarotenoid dioxygenase) in WT and mtabcg20 roots was compared. MtNCED is a key enzyme within the ABA biosynthetic pathway that is positively regulated by ABA at the transcript level (Sussmilch and McAdam, ). The quantitative polymerase chain reaction (qPCR) analyses showed that 24 h after PEG application the mRNA accumulation of MtNCED was in mtabcg20 more than twice as high as in WT (Figure e).…”

Section: Resultsmentioning

confidence: 99%

MtABCG20 is an ABA exporter influencing root morphology and seed germination of Medicago truncatula

et al. 2019

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Summary Abscisic acid (ABA) integrates internal and external signals to coordinate plant development, growth and architecture. It plays a central role in stomatal closure, and prevents germination of freshly produced seeds and germination of non‐dormant seeds under unfavorable circumstances. Here, we describe a Medicago truncatula ATP‐binding cassette (ABC) transporter, MtABCG20, as an ABA exporter present in roots and germinating seeds. In seeds, MtABCG20 was found in the hypocotyl–radicle transition zone of the embryonic axis. Seeds of mtabcg20 plants were more sensitive to ABA upon germination, due to the fact that ABA translocation within mtabcg20 embryos was impaired. Additionally, the mtabcg20 produced fewer lateral roots and formed more nodules compared with wild‐type plants in conditions mimicking drought stress. Heterologous expression in Arabidopsis thaliana provided evidence that MtABCG20 is a plasma membrane protein that is likely to form homodimers. Moreover, export of ABA from Nicotiana tabacum BY2 cells expressing MtABCG20 was faster than in the BY2 without MtABCG20. Our results have implications both in legume crop research and determination of the fundamental molecular processes involved in drought response and germination.

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Surviving a Dry Future: Abscisic Acid (ABA)-Mediated Plant Mechanisms for Conserving Water under Low Humidity

Cited by 28 publications

References 237 publications

Acquiring Control: The Evolution of Stomatal Signalling Pathways

Acquiring Control: The Evolution of Stomatal Signalling Pathways

Transcriptomic analysis of drought stress responses of sea buckthorn (Hippophae rhamnoidessubsp. sinensis) by RNA-Seq

MtABCG20 is an ABA exporter influencing root morphology and seed germination of Medicago truncatula

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