Morphology and [14C]Gibberellin A12 Metabolism in WildType and Dwarf Solanum tuberosum ssp. Andigena Grown under Long and Short Photoperiods

Berg, Jan H. van den; Šimko, Ivan; Davies, Peter J.; Ewing, Elmer E.; Halinska, Anna

doi:10.1016/s0176-1617(11)82010-9

Cited by 48 publications

(18 citation statements)

References 16 publications

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“…Even more, the extremely dwarf S. tuberosum ssp. andigena ga1 mutant, exhibiting a highly reduced leaf area and very short internodes, behaves as strongly induced to tuberize and can form tubers even under LD conditions (31). This finding indicates that the dwarf phenotype of the pACo lines is not responsible for the inhibited tuberization observed in these plants and supports our conclusion that this phenotype is a direct consequence of AtCO overexpression.…”

Section: Resultssupporting

confidence: 82%

Control of photoperiod-regulated tuberization in potato by theArabidopsisflowering-time geneCONSTANS

Martínez‐Garcia

Virgós-Soler

Prat

2002

Proc. Natl. Acad. Sci. U.S.A.

178

136

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Section: Resultssupporting

confidence: 82%

Control of photoperiod-regulated tuberization in potato by theArabidopsisflowering-time geneCONSTANS

Martínez‐Garcia

Virgós-Soler

Prat

2002

Proc. Natl. Acad. Sci. U.S.A.

178

136

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“…Although other studies of GA 12 -aldehyde metabolism in S. tuberosum ssp. andigena plants grown in SD and LD did not find any difference between the photoperiods (Van den Berg et al, 1995), the step controlled by photoperiod could lie before GA 12 -aldehyde in the biosynthetic pathway. Certain steps in the GA biosynthetic pathway are known to be affected by photoperiod, as has been shown in spinach and pea.…”

Section: Gas Inhibit Tuberization and Play A Role In The Control By Pmentioning

confidence: 98%

“…A dwarf mutant of S. tuberosum ssp. andigena that is able to tuberize in LD as well as in SD has been shown to have a partial block in its GA biosynthetic pathway (Van den Berg et al, 1995). Furthermore, wild-type S. tuberosum ssp.…”

Section: Gas Inhibit Tuberization and Play A Role In The Control By Pmentioning

confidence: 99%

Multiple Signaling Pathways Control Tuber Induction in Potato

Jackson¹

1999

Plant Physiology

283

210

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“…POTH1 overexpression transgenic lines share many phenotypes with GA-deficient mutants including dwarfism, decreased internode elongation, and darker leaf coloration (van den Berg et al, 1995b). Exogenous application of GA 3 partially rescued the aberrant leaf phenotype, indicating that overexpression lines were responsive to GA. Levels of the bioactive GA, GA 1 , were reduced in overexpression lines, and the further product of GA 1 metabolism GA 8 even more noticeably, whereas intermediates before GA 20 in the pathway accumulated.…”

Section: Phenotype Of Poth1 Overexpression Transgenic Linesmentioning

confidence: 98%

“…These similarities include decreased plant height, decreased internode length, and darker green coloration of the leaves (van den Berg et al, 1995b). Because of these differences, exogenous GA 3 was applied to determine whether the overexpression lines were responsive to GA treatment.…”

Section: Phenotype Of Poth1 Overexpression Linesmentioning

confidence: 99%

Overexpression of a Knotted-Like Homeobox Gene of Potato Alters Vegetative Development by Decreasing Gibberellin Accumulation

Rosin¹,

Hart²,

et al. 2003

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Potato (Solanum tuberosum) homeobox 1 (POTH1) is a class I homeobox gene isolated from an early-stage tuber cDNA library. The RNA expression pattern of POTH1, unlike that of most other class I knotted-like homeobox genes, is widespread in the cells of both indeterminate and differentiated tissues. Using in situ hybridization, POTH1 transcripts were detected in meristematic cells, leaf primordia, and the vascular procambium of the young stem. Overexpression of POTH1 produced dwarf plants with altered leaf morphology. Leaves were reduced in size and displayed a "mouse-ear" phenotype. The mid-vein was less prominent, resulting in a palmate venation pattern. The overall plant height of overexpression lines was reduced due to a decrease in internode length. Levels of intermediates in the gibberellin (GA) biosynthetic pathway were altered, and the bioactive GA, GA 1 , was reduced by one-half in sense mutants. Accumulation of mRNA for GA 20-oxidase1, a key biosynthetic enzyme, decreased in overexpression lines. In vitro tuberization was enhanced under both short-and long-day photoperiods in several POTH1 overexpression lines. Sense lines produced more tubers at a faster rate than controls. These results imply that POTH1 mediates the development of potato by acting as a negative regulator of GA biosynthesis.Homeobox genes, a family of transcription factors highly conserved in animals, plants, and yeast (Chan et al., 1998), are implicated in the control of cell fate. The Antennapedia homeobox gene in fruitfly (Drosophila melanogaster), for example, specifies leg identity while inhibiting the formation of an antenna (Mann and Chan, 1996). Ectopic expression of the eyeless gene in the wing imaginal disc tissue of fruitfly embryos causes a normal eye to form on the wings (Halder et al., 1995). The first plant homeobox gene to be discovered was knotted1 (kn1) from maize (Zea mays; Vollbrecht et al., 1991). Dominant gain-offunction mutations of Kn1 formed knot-like structures along lateral veins. These knots were composed of cells that continued to divide rather than differentiate normally (Vollbrecht et al., 1991;Smith et al., 1992), indicating that kn1 is involved in regulating cell fate (Clark et al., 1996; Kerstetter et al., 1997; Chan et al., 1998).Knotted-like homeobox (knox) genes have been isolated from several plant species (for review, see Reiser et al., 2000) and can be divided into two classes based on expression patterns and sequence similarity (Kerstetter et al., 1994). Class I knox genes have high similarity to the kn1 homeodomain and generally have a meristem-specific mRNA expression pattern. Class II knox genes usually have a more widespread expression pattern. Knox genes are members of the three amino acid loop extension (TALE) superclass of homeobox genes (Bü rglin, 1997). The TALE superclass includes members from plants, animals, and fungi and is characterized by the addition of three amino acids, Pro-Tyr-Pro (PYP), between helices 1 and 2 of the homeodomain. Knox genes share conserved regions outside of...

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Morphology and [14C]Gibberellin A12 Metabolism in WildType and Dwarf Solanum tuberosum ssp. Andigena Grown under Long and Short Photoperiods

Cited by 48 publications

References 16 publications

Control of photoperiod-regulated tuberization in potato by theArabidopsisflowering-time geneCONSTANS

Control of photoperiod-regulated tuberization in potato by theArabidopsisflowering-time geneCONSTANS

Multiple Signaling Pathways Control Tuber Induction in Potato

Overexpression of a Knotted-Like Homeobox Gene of Potato Alters Vegetative Development by Decreasing Gibberellin Accumulation

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