Elevated CO2 and high endogenous ABA level alleviate PEG-induced short-term osmotic stress in tomato plants

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dc.contributor.authorLi, Shenglan
dc.contributor.authorWang, Xizi
dc.contributor.authorLiu, Xiaojuan
dc.contributor.authorThompson, Andrew J.
dc.contributor.authorLiu, Fulai
dc.date.accessioned2022-01-12T10:07:04Z
dc.date.available2022-01-12T10:07:04Z
dc.date.issued2021-12-18
dc.description.abstractElevated CO2 concentration (e[CO2]) alleviates the impact of drought stress on plants where abscisic acid (ABA) is involved. To explore the mechanisms by which tomato plants respond to short-term osmotic stress, Solanum lycopersicum cv. Ailsa Craig (AC), a transgenic line overproducing ABA (sp5), and an ABA-deficient mutant (flacca) were hydroponically grown under ambient CO2 (400 ppm) and e[CO2] (800 ppm) and then exposed to 10% or 15% (w/v) polyethylene glycol (PEG) 6000 for 24 h before transferring to PEG-free nutrient solution for 24 h. Under non-stress condition, e[CO2] decreased root hydraulic conductance (Kroot), which was overridden by high endogenous ABA in sp5 through increasing specific leaf area and root branching intensity. Basically, e[CO2] improved stress resistance through enhanced water status. PEG stress decreased stomatal conductance and osmotic potential in AC but these effects were less pronounced in sp5, which exhibited a stronger osmotic adjustment (OA) and improved plant fitness. A greater flexibility of hydraulic system and a reduced sensitivity of Kroot to ABA might confer sp5 a great ability to recover from PEG stress. On the contrary, high stomatal density, size and pore aperture of flacca rendered plants suffering severe stress. Moreover, the premise that PEG stress could mimic soil water deficit was the sufficient achievement of OA. Our results indicate that e[CO2] and high endogenous ABA level could improve osmotic stress resistance in tomato plants via osmotic and hydraulic adjustments.en_UK
dc.identifier.citationLi S, Wang X, Liu X, et al., (2022) Elevated CO2 and high endogenous ABA level alleviate PEG-induced short-term osmotic stress in tomato plants, Environmental and Experimental Botany, Volume 194, February 2022, Article number 104763en_UK
dc.identifier.issn0098-8472
dc.identifier.urihttps://doi.org/10.1016/j.envexpbot.2021.104763
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/17396
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectAbscisic aciden_UK
dc.subjectElevated CO2en_UK
dc.subjectOsmotic stressen_UK
dc.subjectPolyethylene glycolen_UK
dc.subjectRoot hydraulic conductanceen_UK
dc.subjectStomatal conductanceen_UK
dc.titleElevated CO2 and high endogenous ABA level alleviate PEG-induced short-term osmotic stress in tomato plantsen_UK
dc.typeArticleen_UK

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