http://www.cnr.it/ontology/cnr/individuo/prodotto/ID318447
HOMEODOMAIN-LEUCINE ZIPPER II FAMILY OF TRANSCRIPTION FACTORS CONTROL APICAL EMBRYO DEVELOPMENT, MERISTEM FUNCTION AND ORGAN POLARITY (Abstract/Poster in atti di convegno)
- Type
- Label
- HOMEODOMAIN-LEUCINE ZIPPER II FAMILY OF TRANSCRIPTION FACTORS CONTROL APICAL EMBRYO DEVELOPMENT, MERISTEM FUNCTION AND ORGAN POLARITY (Abstract/Poster in atti di convegno) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Alternative label
TURCHI L.*, CARABELLI M.*, RUZZA V.*, POSSENTI M.**, SASSI M.*?, PEÑALOSA A.**,
SESSA G.*, SALVI S.**, FORTE V.**, MORELLI G.**, RUBERTI I.* (2013)
HOMEODOMAIN-LEUCINE ZIPPER II FAMILY OF TRANSCRIPTION FACTORS CONTROL APICAL EMBRYO DEVELOPMENT, MERISTEM FUNCTION AND ORGAN POLARITY
in 57th Italian Society of Agricultural Genetics Annual Congress, Foggia, Italy, 16-19 settembre 2013
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- TURCHI L.*, CARABELLI M.*, RUZZA V.*, POSSENTI M.**, SASSI M.*?, PEÑALOSA A.**,
SESSA G.*, SALVI S.**, FORTE V.**, MORELLI G.**, RUBERTI I.* (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
- Proceedings of the 57th Italian Society of Agricultural Genetics Annual Congress (literal)
- Note
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- *) Institute of Molecular Biology and Pathology, National Research Council (Italy)
**) Food and Nutrition Research Centre, Agricultural Research Council (Italy)
?) Present address: Laboratoire de Reproduction et Développement des Plantes, École Normale
Supérieure de Lyon (France) (literal)
- Titolo
- HOMEODOMAIN-LEUCINE ZIPPER II FAMILY OF TRANSCRIPTION FACTORS CONTROL APICAL EMBRYO DEVELOPMENT, MERISTEM FUNCTION AND ORGAN POLARITY (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
- 978-88-904570-3-6 (literal)
- Abstract
- The Arabidopsis genome encodes for 10 Homeodomain-Leucine Zipper II (HD-Zip II)
transcription factors that can be grouped into four clades (?-?). ATHB2, HAT1, HAT2 (g
subfamily), HAT3 and ATHB4 (d subfamily) are all regulated by light quality changes that induce
the shade avoidance response in most of the angiosperms (Ciarbelli et al., 2008). Intriguingly, it has
recently emerged that besides their role in shade avoidance HD-Zip IIg and HD-Zip IId proteins
play a crucial role in plant development from embryogenesis onwards in a white light environment.
It has been indeed found that cotyledon development and number are altered in hat3 athb4 loss-offunction
mutant embryos, and that these defects correlate with changes in auxin distribution and
response, indicating a link between auxin-mediated embryo patterning and HD-Zip II function
(Turchi et al., 2013; this work). Interestingly, it has also been shown that ATHB2 is induced in the
HAT3-ATHB4 expression domain in the apical part of the embryo, marking the incipient
cotyledons, as well as in the shoot apical meristem (SAM) of hat3 athb4, and thus can at least
partially compensate for HAT3 and ATHB4 function. Consistent with ATHB2 being, to some
extent, functionally interchangeable with HD-Zip II? proteins, it was observed that athb2 loss-offunction
mutations enhance the hat3 athb4 phenotype. Indeed, hat3 athb4 athb2 mutants display
one or two radialized cotyledons and lack an active SAM, resembling phenotypes associated with
loss-of-function mutations in the HD-Zip III genes PHB, PHV and REV, master regulators of apical
embryo development and primary determinants of adaxial cell fate (Turchi et al. 2013 and
references therein). It has been then demonstrated that simultaneous lack of both HAT3 and
ATHB4 is associated with loss of adaxial identity of lateral organs whereas ectopic expression of
HAT3, ATHB4 or ATHB2 results in upward leaf curling, a phenotype similar to that seen when
HD-Zip III genes are expressed in both adaxial and abaxial regions of lateral organs (Bou-Torrent et
al., 2012; Turchi et al., 2013 and references therein; this work). The functional interaction between
HD-Zip II and HD-Zip III genes has been further corroborated by the discovery that ATHB2 is
directly positively regulated by REV in vivo (Turchi et al., 2013). Together, these findings
demonstrate that members of the HD-Zip II protein family, mostly known for their role in shade
avoidance, control embryo apical patterning, SAM activity and organ polarity interacting with HDZip
III proteins. (literal)
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