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Functional characterization of tomato Sl-IAA3 and Sl-hls genes. Role ...

Functional characterization of tomato Sl-IAA3 and Sl-hls genes. Role ...

ChapitreI: Bibliographic

ChapitreI: Bibliographic review (Giovannoni., 2007) Figure 34. Summary of ripening control. The ripening-specific transcription factors MADS-RIN and CNR-SPB are necessary for the induction of ethylene- and non-ethylene-mediated ripening control, as defined by the rin and Cnr mutations, respectively. The ethylene signal is transduced although the ethylene receptor (NR) and the GR protein, which might participate in maintaining receptor-copper homeostasis. These genes were defined by the cloning of the alleles that are responsible for the Nr and Gr mutations, respectively. VIII.7.b Potential role on auxin in fruit development and ripening In comparison with ethylene, very little is known about the role of other hormones in fruit development. The role of auxin has been extensively investigated in other fruits such as strawberry (Manning, 1994) and grape berries (Davies et al., 1997). In tomato, the fact that several expansins encoding genes are expressed during fruit development and that they are regulated by auxins in other plant organs, led to the postulate that auxins are part of the hormonal signalling transduction network controlling cell expansion in tomato fruit (Catala et al., 2000). This hypothesis is further supported by the fact that the auxin concentration in tomato fruits peaks well before the onset of ripening (approximately at 10 DPA) coincident with a higher expression of fruit-specific expansin genes (Gillaspy et al., 1993). In 2003, Balbi and Lomax, by means of characterization of auxin-resistant mutant dgt (diageotropica), have proposed a cross-talk model of auxin responsiveness and ethylene biosynthesis at very early stages of fruit development. In 2005, Wang et al demonstrate, for the first time in our laboratory, that down regulation of auxin transcription factor (IAA9) induce parthenocarpy in the tomato fruit. This finding opens a new route that merits 48

ChapitreI: Bibliographic review further investigation to test whether other members of the Aux/IAA family have implications on fruit development and ripening. 49

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