Identification & functional characterization of the Arabidopsis ZINC FINGER PROTEIN 3

Joseph Mary Prathiba
Identification & functional characterization of the Arabidopsis ZINC FINGER PROTEIN 3.
PhD, University of Szeged.
(2014)

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Official URL: http://www.ncbi.nlm.nih.gov/pubmed/24808098

Abstract in foreign language

Abscisic acid regulates numerous processes such as seed desiccation, germination and responses to drought. Controlled cDNA Overexpression System (Papdi 2008) was employed to identify novel genes coding for important factors controlling ABA regulation. Screening for ABA insensitive germination of the transgenic plant population, transformed with the COS library, lead to the of identification several stress regulatory genes. Most pronounced Estradiol dependent ABA insenstitive germination was detected in A26 or A44 lines carrying either the full-length cDNAs, the small heat-shock protein HSP17.6A-cII (Papdi 2008) or a previously uncharacterized zinc-finger domain containing transcription factor protein. We have shown that ZFP3, a nuclear C2H2 zinc finger protein acts as a negative regulator of ABA- suppressed germination. Accordingly, regulated over-expression of ZFP3 and the closely related ZFP1, ZFP4, ZFP6 and ZFP7 zinc finger factors confers ABA insensitivity to seed germination while the zfp3 zfp4 double mutant displays enhanced ABA susceptibility. Reduced expression of several ABA-induced genes, such as RAB18 and ABI4 in ZFP3ox seedlings suggests that ZFP3 negatively regulates ABA signaling. ZFP3ox plants showed multiple phenotypic alterations, such as semidwarf growth habit, defects in fertility and enhanced sensitivity of hypocotyl elongation to red but not to far-red or blue light. Analysis of genetic interactions between phytochrome and abi mutants indicates that ZFP3 enhances red light signaling by photoreceptors other than phyA, and additively increases ABA insensitivity conferred by the abi2, abi4 and abi5 mutations. These data support the conclusion that ZFP3 and other members of the ZFP subfamily regulate light and ABA responses during germination and early seedling development.

Item Type: Thesis (PhD)
Creators: Joseph Mary Prathiba
Divisions: Doctoral School of Biology
Discipline label: természettudományok > biológiai tudományok
Defence date label: 2014. November 18.
Item ID: 2339
doi: https://doi.org/10.14232/phd.2339
Date Deposited: 2014. Sep. 08. 09:17
Last Modified: 2017. Jun. 13. 14:20
Depository no.: B 5799
Supervisor label:
Supervisor Supervisor scientific name label
Dr Szabados László
tudományos tanácsadó, MTA SZBK Növénybiológiai Intézet
Reviewer label:
Reviewer name label Reviewer scientific name label
Dr. Ádám Éva
Dr. Magyar Zoltán
tudományos főmunkatárs, Ph.D., MTA SZBK Növényiológiai Intézet
tudományos főmunkatárs, Ph.D., MTA SZBK Növénybiológiai Intézet
President label:
President name label President scientific name label
Dr. Kovács Kornél
egyetemi tanár, az MTA doktora, SZTE TTIK Biotechnológiai Tanszék
Member label:
Member name label Member scientific name label
Dr. Györgyey János
Dr. Szepesi Ágnes
tudományos főmunkatárs, Ph.D., MTA SZBK Növénybiológiai Intézet
adjunktus, Ph.D., SZTE TTIK Növénybiológiai Tanszék
URI: http://doktori.bibl.u-szeged.hu/id/eprint/2339
Defence/Citable status: Defended.

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