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| 001 | 846019 | ||
| 005 | 20210129233816.0 | ||
| 024 | 7 | _ | |a 10.3389/fpls.2018.00655 |2 doi |
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| 100 | 1 | _ | |a Prerostova, Sylva |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a Cytokinins: Their Impact on Molecular and Growth Responses to Drought Stress and Recovery in Arabidopsis |
| 260 | _ | _ | |a Lausanne |c 2018 |b Frontiers Media88991 |
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| 520 | _ | _ | |a Our phenotyping and hormonal study has characterized the role of cytokinins (CK) in the drought and recovery responses of Arabidopsis thaliana. CK down-regulation was achieved by overexpression of the gene for CK deactivating enzyme cytokinin oxidase/dehydrogenase (CKX): constitutive (35S:CKX) or at the stress onset using a dexamethasone-inducible pOp/LhGR promoter (DEX:CKX). The 35S:CKX plants exhibited slow ontogenesis and higher expression levels of stress-associated genes, e.g., AtP5CS1, already at well-watered conditions. CK down-regulation resulted during drought in higher stress tolerance (indicated by relatively low up-regulation of the expression of drought stress marker gene AtRD29B) accompanied with lower leaf water loss. Nevertheless, these plants exhibited slow and delayed recovery after re-watering. CK levels were increased at the stress onset by stimulation of the expression of CK biosynthetic gene isopentenyl transferase (ipt) (DEX:IPT) or by application of exogenous CK meta-topolin. After water withdrawal, long-term CK elevation resulted in higher water loss in comparison with CKX transformants as well as with plants overexpressing ipt driven by senescence-inducible SAG12 promoter (SAG:IPT), which gradually enhanced CKs during the stress progression. In all cases, CK up-regulation resulted in fast and more vigorous recovery. All drought-stressed plants exhibited growth suppression associated with elevation of abscisic acid and decrease of auxins and active CKs (with the exception of SAG:IPT plants). Apart from the ipt overexpressers, also increase of jasmonic and salicylic acid was found. |
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| 700 | 1 | _ | |a Vankova, Radomira |0 P:(DE-HGF)0 |b 13 |e Corresponding author |
| 773 | _ | _ | |a 10.3389/fpls.2018.00655 |g Vol. 9, p. 655 |0 PERI:(DE-600)2711035-7 |p 655 |t Frontiers in Functional Plant Ecology |v 9 |y 2018 |x 1664-462X |
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