Induction of gibberellin 20-oxidases and repression of gibberellin 2b-oxidases in unfertilized ovaries of entire tomato mutant, leads to accumulation of active gibberellins and parthenocarpic fruit formation
In tomato (Solanum lycopersicum L.), auxin and gibberellins (GAs) cross-talk plays an important role during fruit-set. The entire tomato mutant has been previ- ously reported to carry a deletion in the coding region of the SlIAA9 gene, a member of the auxin signal repressor family Aux/IAA....
Guardado en:
| Autores principales: | , , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Springer
2021
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| Materias: | |
| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/28499 |
| Aporte de: |
| Sumario: | In tomato (Solanum lycopersicum L.), auxin
and gibberellins (GAs) cross-talk plays an important role
during fruit-set. The entire tomato mutant has been previ-
ously reported to carry a deletion in the coding region of
the SlIAA9 gene, a member of the auxin signal repressor
family Aux/IAA. In this paper, we examined the role of
ENTIRE gene in controlling GAs metabolism and directing
spontaneous fruit initiation and early ovary growth. It was
shown that, similarly to pollinated fruits, facultative par-
thenocarpy in entire depends on active GA metabolism,
since fruit growth is suppressed when GA biosynthesis is
blocked. Analysis of endogenous GAs during the first
10 days after flower emasculation revealed that entire
fruits accumulated higher amounts of active GAs (GA1 and
GA3) in comparison to wild type pollinated fruits, sug-
gesting that a different GA homeostasis regulation occurs.
Transcript analysis of the main GA biosynthesis genes
showed that differently from unpollinated and non par-
thenocarpic wild type ovaries, in entire active GA flux
modulation is regulated by the activation of SlGA20ox1
and SlGA20ox2 and also by a marked reduction of GA
catabolism (reduced transcription of GA 2b-oxidase genes)
during the early fruit expansion phase. |
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