Hichri I., Muhovski Y., Žižková E., Dobrev P.I., Franco-Zorrilla J.M., Solano R., Lopez-Vidriero I., Motyka V., Lutts S.
PLANT PHYSIOLOGY
164:
1967-1990,
2014
Klíčová slova:
Abscisic acid, Arabidopsis, development, phytohormone, salinity, tomato, transcription factor, zinc finger repressor
Abstrakt:
The zinc finger superfamily includes transcription factors that regulate multiple aspects of plant development and were recently shown
to regulate abiotic stress tolerance. Cultivated tomato (Solanum lycopersicum Zinc Finger2 [SIZF2]) is a cysteine-2/histidine-2-type zinc
finger transcription factor bearing an ERF-associated amphiphilic repression domain and binding to the ACGTCAGTG sequence
containing two AGT core motifs. SlZF2 is ubiquitously expressed during plant development, and is rapidly induced by sodium
chloride, drought, and potassium chloride treatments. Its ectopic expression in Arabidopsis (Arabidopsis thaliana) and tomato impaired
development and influenced leaf and flower shape, while causing a general stress visible by anthocyanin and malonyldialdehyde
accumulation. SlZF2 enhanced salt sensitivity in Arabidopsis, whereas SlZF2 delayed senescence and improved tomato salt tolerance,
particularly by maintaining photosynthesis and increasing polyamine biosynthesis, in salt-treated hydroponic cultures (125 mM sodium
chloride, 20 d). SlZF2may be involved in abscisic acid (ABA) biosynthesis/signaling, because SlZF2 is rapidly induced by ABA treatment
and 35S::SlZF2 tomatoes accumulate more ABA than wild-type plants. Transcriptome analysis of 35S::SlZF2 revealed that SlZF2 both
increased and reduced expression of a comparable number of genes involved in various physiological processes such as photosynthesis,
polyamine biosynthesis, and hormone (notably ABA) biosynthesis/signaling. Involvement of these different metabolic pathways in salt
stress tolerance is discussed.
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Autoři z ÚEB: Petre I. Dobrev,
Václav Motyka,
Eva Žižková
Čeština
English