Changes in indole-3-acetic acid levels during tomato (Lycopersicon esculentum Mill.) seed development |
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Authors: | Valérie Hocher Bruno Sotta Régis Maldiney Magda Bonnet Emile Miginiac |
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Institution: | (1) Laboratoire de Physiologie du Développement des Plantes, URA CNRS 1180, T 53-Etage 5, Boite 156, Université P et M Curie, 4 place Jussieu, 75252, 05 Paris, Cedex, France |
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Abstract: | Summary The changes in the level of indole-3-acetic acid (IAA) were investigated in seeds and fruit tissues-placenta and mesocarp-during tomato (Lycopersicon esculentum Mill.) zygotic embryogenesis, which was characterized through eight morphological embryo stages from globular (stage 1) to mature embryo (stage 8)]. In whole seeds, IAA levels increased mainly at stage 3 (young torpedo) and at stage 5 (late torpedo stage). As the seed matured and dehydrated, IAA levels decreased and showed a new distribution pattern within seed structures, preferentially in endosperm tissue. IAA contents in fruit tissues were lower but followed the same pattern as those of seeds. These data support the hypothesis of IAA biosynthesis in seeds with a transient role of the endosperm at the end of embryo development and suggest a role of IAA in fruit and seed growth. Moreover a comparison of IAA and ABA changes suggests that IAA could be especially necessary for the beginning of embryo growth, whereas ABA could act mainly at the end of the growth phase.Abbreviations ABA
abscisic acid
- ABTS
2,2 -azino-bis (3-ethylbenzthiazoline-6-sulfonic acid)
- BHT
butylhydroxytoluene
- DW
dry weight
- ELISA
enzyme linked immunosorbent assay
- HPLC
high performance liquid chromatography
- IAA
indole-3-acetic acid. PGRs: plant growth regulators |
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