http://www.cnr.it/ontology/cnr/individuo/prodotto/ID177902
Influence of an Arabidopsis dominant negative athb2 mutant on tomato plant development (Contributo in atti di convegno)
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- Influence of an Arabidopsis dominant negative athb2 mutant on tomato plant development (Contributo in atti di convegno) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Alternative label
R Iannacone (1); F Mittempergher (2); G Morelli (3); G Panio (1); A Perito (1); I Ruberti (2); G Sessa (2); F Cellini (1) (2008)
Influence of an Arabidopsis dominant negative athb2 mutant on tomato plant development
in 15th Meeting of the EUCARPIA-Tomato-Working-Group, Bari, ITALY, September 20-23, 2008
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- R Iannacone (1); F Mittempergher (2); G Morelli (3); G Panio (1); A Perito (1); I Ruberti (2); G Sessa (2); F Cellini (1) (literal)
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- http://www.actahort.org/books/789/789_36.htm (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
- PROCEEDINGS OF THE FIFTEENTH MEETING OF THE EUCARPIA TOMATO WORKING GROUP (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- (1) Metapontum Agrobios
(2) Istituto di Biologia e Patologia Molecolari
(3) Istituto Nazionale di Ricerca per gli Alimenti e la Nutrizione (literal)
- Titolo
- Influence of an Arabidopsis dominant negative athb2 mutant on tomato plant development (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
- 978-90-6605-369-4 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
- Cirulli, M; Scott, JW; Bubici, G (literal)
- Abstract
- Plants growing in close proximìty exhibit the shade avoidance syndrome in
response to reflected far-red (FR) radiation from neighbors. The shade avoidance
response essentially redirects resources and growth potential from the leaf and
storage organs into increased extension growth to optimize light capture by plants.
Molecurar-genetic studies implicated ATHB2, a homeodomain-leucine zippper (HD-
Zip) transcription factor, as a major regutator of the shade avoidance response in
Arabidopsis. To further characterize the function of ATHB2 and related HD-Zip
proteins (HD-Zip II) Arabidopsis transgenic plants expressing a derivative of
ATHB2 containing a single aminoacid substitution in the HD domain
(ATHB2N51A), whích is known to abolish DNA binding of homodimeric as well as
heterodimeric complexes, were generated. This mutation is expected to produce a
dominant-negative phenotype. Indeed, at the seedling stage, the phenotype of the
ATHB2N51A lines is the same as that shown by antiiense ATHB2 lines, but more
severe. At later stages of development, the dominant-negative plants produce more
leaves and an higher number of lateral inflorescences than the controls. Furthermore,
expression of ATHB2N51A in Arabidopsis seedlings
attenuates the elongation response induced by shade. We then took advantage of the Arabidopsis dominant
negative athb2 mutant to investigate the function of the tomato orthologues. The
HD-Zip domain within the HD-Zip II family has been highly conserved during
evolution, and thus it is likely that overexpression of the Arabidopsis ATHB2N5IA
gene in tomato may result in the formation of heterodimeric complexes with the
endogenous HD-ZIP II proteins preventing that of functional dimers. Transgenic
tomato expressing costitutively the Arabilopsis ATHB2N51A gene showed strong
alteration of phenotype. Plants had shorter internodes and high proliferation of
lateral branches. Furthermore flowering was delayed. We can speculate that the
Arabidopsis ATHB2N51A forms heterodimers with the tomato ortholog, so that the
transcription of the target gene is highly affected. (literal)
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