Molecular dissection of the role of auxin in fruit initiation

Pandolfini, Tiziana; Molesini, Barbara; Spena, Angelo

doi:10.1016/j.tplants.2007.06.011

Cited by 85 publications

(71 citation statements)

References 20 publications

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“…More recently, the AUXIN RESPONSE FACTOR8 (ARF8) from Arabidopsis (Arabidopsis thaliana; Goetz et al, 2006) and tomato (Goetz et al, 2007), ARF7 from tomato (de Jong et al, 2009b), and the Aux/IAA protein IAA9 from tomato (Wang et al, 2005) have been characterized as transcription factors from the auxin signaling pathway that repress fruit-set in the absence of fertilization. All these results support the idea that auxins are also involved in tomato fruit-set (Pandolfini et al, 2007;de Jong et al, 2009a).…”

supporting

confidence: 85%

Inhibition of Auxin Transport from the Ovary or from the Apical Shoot Induces Parthenocarpic Fruit-Set in Tomato Mediated by Gibberellins

et al. 2010

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Fruit-set in tomato (Solanum lycopersicum) depends on gibberellins and auxins (GAs). Here, we show, using the cv MicroTom, that application of N-1-naphthylphthalamic acid (NPA; an inhibitor of auxin transport) to unpollinated ovaries induced parthenocarpic fruit-set, associated with an increase of indole-3-acetic acid (IAA) content, and that this effect was negated by paclobutrazol (an inhibitor of GA biosynthesis). NPA-induced ovaries contained higher content of GA 1 (an active GA) and transcripts of GA biosynthetic genes (SlCPS, SlGA20ox1, and -2). Interestingly, application of NPA to pollinated ovaries prevented their growth, potentially due to supraoptimal IAA accumulation. Plant decapitation and inhibition of auxin transport by NPA from the apical shoot also induced parthenocarpic fruit growth of unpollinated ovaries. Application of IAA to the severed stump negated the plant decapitation effect, indicating that the apical shoot prevents unpollinated ovary growth through IAA transport. Parthenocarpic fruit growth induced by plant decapitation was associated with high levels of GA 1 and was counteracted by paclobutrazol treatment. Plant decapitation also produced changes in transcript levels of genes encoding enzymes of GA biosynthesis (SlCPS and SlGA20ox1) in the ovary, quite similar to those found in NPA-induced fruits. All these results suggest that auxin can have opposing effects on fruit-set, either inducing (when accumulated in the ovary) or repressing (when transported from the apical shoot) that process, and that GAs act as mediators in both cases. The effect of NPA application and decapitation on fruit-set induction was also observed in MicroTom lines bearing introgressed DWARF and SELF-PRUNING wild-type alleles.

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confidence: 85%

Inhibition of Auxin Transport from the Ovary or from the Apical Shoot Induces Parthenocarpic Fruit-Set in Tomato Mediated by Gibberellins

et al. 2010

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“…Given the fundamental nature of both the dietary and biological significance of fruit, it is unsurprising that the molecular dissection of fruit development has recently received considerable interest (Giovannoni, 2001;Pandolfini et al, 2007;Serrani et al, 2008). The fruit is the result of the development of the ovary, and fruit organogenesis originates from a flower primordial.…”

Section: Introductionmentioning

confidence: 99%

Regulatory Features Underlying Pollination-Dependent and -Independent Tomato Fruit Set Revealed by Transcript and Primary Metabolite Profiling

et al. 2009

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Indole Acetic Acid 9 (IAA9) is a negative auxin response regulator belonging to the Aux/IAA transcription factor gene family whose downregulation triggers fruit set before pollination, thus giving rise to parthenocarpy. In situ hybridization experiments revealed that a tissue-specific gradient of IAA9 expression is established during flower development, the release of which upon pollination triggers the initiation of fruit development. Comparative transcriptome and targeted metabolome analysis uncovered important features of the molecular events underlying pollination-induced and pollination-independent fruit set. Comprehensive transcriptomic profiling identified a high number of genes common to both types of fruit set, among which only a small subset are dependent on IAA9 regulation. The fine-tuning of Aux/IAA and ARF genes and the downregulation of TAG1 and TAGL6 MADS box genes are instrumental in triggering the fruit set program. Auxin and ethylene emerged as the most active signaling hormones involved in the flower-to-fruit transition. However, while these hormones affected only a small number of transcriptional events, dramatic shifts were observed at the metabolic and developmental levels. The activation of photosynthesis and sucrose metabolism-related genes is an integral regulatory component of fruit set process. The combined results allow a far greater comprehension of the regulatory and metabolic events controlling early fruit development both in the presence and absence of pollination/fertilization.

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“…Genes involved in ethylene biosynthetic pathway as well as responsible for its signaling are down regulated after fruit setting (Pandolfini et al, 2007;Stepanova et al, 2008) when plants are pollinated and even treated with gibberellin. The effect of ethylene in fruit setting and development was not under keen consideration of scientists and that's why had not been studied eagerly until last 1-2 decades.…”

Section: Introductionmentioning

confidence: 99%

Molecular Biology of Ethylene, a Review

Ijaz¹

2016

mpb

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Ethylene is a plant hormone of wide-ranging diverse effects on plants physiology and development. This simple molecule interacts with other hormones and factors with very versatile and fantastic manner for executing growth as well as developmental events in plants. Ethylene has strong impact on myriad developmental events of plants from germination to senescence. Here intent is to focus and highlight the importance, synthesis, regulatory genetic network and signaling integration of this versatile molecule that affects plant growth and development in a myriad ways.

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Molecular dissection of the role of auxin in fruit initiation

Cited by 85 publications

References 20 publications

Inhibition of Auxin Transport from the Ovary or from the Apical Shoot Induces Parthenocarpic Fruit-Set in Tomato Mediated by Gibberellins

Inhibition of Auxin Transport from the Ovary or from the Apical Shoot Induces Parthenocarpic Fruit-Set in Tomato Mediated by Gibberellins

Regulatory Features Underlying Pollination-Dependent and -Independent Tomato Fruit Set Revealed by Transcript and Primary Metabolite Profiling

Molecular Biology of Ethylene, a Review

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