Gibberellin A1 Metabolism Contributes to the Control of Photoperiod-Mediated Tuberization in Potato

Bou-Torrent, Jordi; Martínez‐Garcia, Jaime F.; Garcı́a-Martı́nez, José-Luis; Prat, Salomé

doi:10.1371/journal.pone.0024458

Cited by 47 publications

(18 citation statements)

References 51 publications

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“…In an analogous, but converse, process, SD induction of tuberization in potatoes, a process that is inhibited by GAs, is associated with enhanced expression of StGA2ox1 adjacent to the stolon meristem prior to stolon swelling and tuber formation [185]. Transfer of potatoes to SDs also results in reduced expression of StGA3ox2 in stolons, but increased expression of this gene in shoots [186]. It is suggested that in SDs less GA is transported from the shoots to the stolons due to enhanced conversion of the mobile GA 20 into the less mobile GA 1 , which accumulates and promotes shoot growth.…”

Section: Environmental Regulationmentioning

confidence: 99%

Gibberellin biosynthesis and its regulation

Hedden

Thomas

2012

Biochemical Journal

708

573

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The GAs (gibberellins) comprise a large group of diterpenoid carboxylic acids that are ubiquitous in higher plants, in which certain members function as endogenous growth regulators, promoting organ expansion and developmental changes. These compounds are also produced by some species of lower plants, fungi and bacteria, although, in contrast to higher plants, the function of GAs in these organisms has only recently been investigated and is still unclear. In higher plants, GAs are synthesized by the action of terpene cyclases, cytochrome P450 mono-oxygenases and 2-oxoglutarate-dependent dioxygenases localized, respectively, in plastids, the endomembrane system and the cytosol. The concentration of biologically active GAs at their sites of action is tightly regulated and is moderated by numerous developmental and environmental cues. Recent research has focused on regulatory mechanisms, acting primarily on expression of the genes that encode the dioxygenases involved in biosynthesis and deactivation. The present review discusses the current state of knowledge on GA metabolism with particular emphasis on regulation, including the complex mechanisms for the maintenance of GA homoeostasis.

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Section: Environmental Regulationmentioning

confidence: 99%

Gibberellin biosynthesis and its regulation

Hedden

Thomas

2012

Biochemical Journal

708

573

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“…The leaf specific expression of StGA3ox2 and the 35S overexpression resulted in earlier tuberization, in contrast to the tuber specific expression that had slightly delayed tuberization. 9 The different phenotypes observed when the StGA3ox2 gene expression is driven by the leaf or the tuber specific promoter can be explained by different transport of the various GAs. The main transporter in pea was shown to be GA 20 , 10 a precursor of GA 1 .…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

A crosstalk of auxin and GA during tuber development

Roumeliotis

Visser

Bachem

2012

Plant Signaling & Behavior

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Several hormones have been studied for their effect on tuber initiation and development. Until recently, the hormone with the most prominent role in tuber initiation was attributed to GA. Genes involved in GA degradation do exhibit an upregulated profile during early stages of tuber development, leading to a rapid decrease of active GA content, thereby facilitating stolon-tip swelling. While GA is known to be involved in shoot and stolon elongation, the development of the new tuberorgan requires changes in meristem identity and the reorientation ofthe plane of cell division. In other developmental processes, such as embryo patterning, flower development and lateral root initiation auxin plays a key role. Recent evidence on the involvement of auxin in tuber formation was providedby the measurement of auxin content in swelling stolons. Auxin content in the stolon tips increased several fold prior to tuber swelling. In vitro tuberisation experiments with auxin applications support the role of auxin during tuber initiation. Taken together, it is becoming clear that the initiation and induction of tubers in potato is a developmental process that appears to be regulated by a crosstalk between GA and auxin.

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“…For example, the change in cell growth orientation characteristic of tuber formation from longitudinal (unidirectional stolon elongation) to radial swelling of the stolon tip is regulated by GA 3 (Xu et al, 1998a). Potato genes that control GA metabolism have been carefully studied over the past several years (Carrera et al, 2000;Martínez-García et al, 2001;Bou-Torrent et al, 2011;Roumeliotis et al, 2013a). The activity of GA20 OXIDASE1 (GA20OX1), a biosynthetic enzyme, is repressed during tuberization, whereas GA2OX1, a catabolic enzyme, is strongly induced during the early stages of tuber formation (Kloosterman et al, 2007).…”

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confidence: 99%