Gibberellins and Stem Growth as Related to Photoperiod in <i>Silene armeria</i> L.

Talón, Manuel; Zeevaart, Jan A. D.

doi:10.1104/pp.92.4.1094

Cited by 88 publications

(84 citation statements)

References 12 publications

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“…Evidence for increased GA biosynthesis in rosette plants in LD conditions has been obtained previously (e.g. Talon and Zeevaart, 1990;Talon et al, 1991aTalon et al, , 1991b. The present results provide experimental evidence in support of the idea (West et al, 1982;Graebe, 1987) that ent-kaurene biosynthesis is a point of regulation for the entire GA biosynthetic pathway.…”

Section: Dlscusslonsupporting

confidence: 79%

ent-Kaurene Biosynthesis Is Enhanced by Long Photoperiods in the Long-Day Plants Spinacia oleracea L. and Agrostemma githago L

Zeevaart

Gage

1993

Plant Physiol.

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The effect of photoperiod on ent-kaurene biosynthesis was determined in the long-day (LD) plants spinach (Spinacia oleracea 1.) and Agrostemma githago L . Further metabolism of ent-kaurene was blocked by application of the growth retardant tetcyclacis, and ent-kaurene accumulation was measured by isotopic dilution using gas chromatography-selected ion monitoring (CC-SIM) (E.Physiol 96: 1099-1104). In spinach, the rate of ent-kaurene accumulation in shoots grown under LD conditions was 3 times higher than in shoots grown under short-day (SD) conditions. ent-Kaurene also accumulated in fully expanded leaves, but at a lower rate than in shoots (15 and 55 pmol g-' dry weight h-', respectively). In Agrostemma, ent-kaurene accumulated at a rate 2.5 times higher in plants grown under LD conditions than in those grown under SD conditions. In spinach, enhanced ent-kaurene accumulation was detectable after 1 long day, and with exposure to additional long days, the rate of ent-kaurene accumulation increased further.Conversely, when plants were exposed to LD conditions and then returned to SD conditions, the rate of ent-kaurene accumulation decreased. Following tetcyclacis application, ent-kaurene accumulation was observed in all parts of spinach that were analyzed, but there were large quantitative differences between organs of different ages. As the leaves matured, enf-kaurene biosynthesis declined. Petioles accumulated more ent-kaurene than the corresponding leaf blades. It is concluded that stimulation of entkaurene biosynthesis by LD conditions leads to a higher rate of gibberellin biosynthesis, which is essential for stem elongation in rosette plants.There is considerable evidence that the rate of GA biosynthesis in LD rosette plants is higher under LD conditions, when stem elongation and flower formation take place, than during vegetative growth in the rosette stage under SD conditions. For example, the GA content increased severalfold after the transfer of Silene plants from SD to LD conditions

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Section: Dlscusslonsupporting

confidence: 79%

ent-Kaurene Biosynthesis Is Enhanced by Long Photoperiods in the Long-Day Plants Spinacia oleracea L. and Agrostemma githago L

Zeevaart

Gage

1993

Plant Physiol.

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“…The extract was absorbed to a 1.0-g column of PVPP and the column was eluted with 60 mL of the same buffer. The eluate was adjusted to pH 2.5 and applied to a column of charcoal:Celite (1:2, w/w) adsorption chromatography (24). Ten milliliters of 0.1 M K-Pi buffer at pH 8.2 were added previously to the elution flask and the GAs were eluted with 800 mL of 80% acetone.…”

mentioning

confidence: 99%

Gibberellins and Parthenocarpic Ability in Developing Ovaries of Seedless Mandarins

Talón¹,

Zacarı́as²,

Primo‐Millo³

1992

Plant Physiol.

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131

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Satsuma (Citrus unshiu [Mak] Marc.) and Clementine (Citrus reticulata [Hort.] Ex. Tanaka, cv Oroval) are two species of seedless mandarins differing in their tendency to develop parthenocarpic fruits. Satsuma is a male-sterile cultivar that shows a high degree of natural parthenocarpy and a high fruit set. Seedless Clementine varieties are self-incompatible, and in the absence of cross-pollination show a very low ability to set fruit. The gibberellins (GAs)

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“…It is known that photoperiod affects endogenous levels of GA (Talon & Zeevaart, 1990), but it is apparent that this is not sufficient to explain the observed interplay between GA and light. For example, studies on the GA-induced stem elongation in phy B mutants of Arabidopsis, pea and cucumber has led to the conclusion that phy B and GA are more likely to interact at the level of individual response elements than through alterations in GA concentration or GA-receptor activation.…”

Section: Ga Genes and Phytochromementioning

confidence: 99%

Gibberellins: regulating genes and germination

Ritchie

Gilroy

1998

New Phytologist

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The range of processes regulated by gibberellins (GAs) covers all aspects of the life history of the plant from seed germination to vegetative growth and flowering. In seeds there has been an intensive search, using the techniques of both biochemistry and cell biology, for the regulatory molecules linking GA perception to gene regulation and the events of germination. Although a GA receptor has yet to be identified, the site of perception has been localized to the plasma membrane. Calmodulin, Ca2+ and cGMP have also been identified as elements of the GA signal transduction pathway. These regulators parallel many of the signalling elements identified in the transduction of other signals such as phytochrome and ABA. Studies of GA‐regulated gene expression, principally of the α‐amylases of cereal aleurone, have identified core GA‐responsive promoter elements, such as the gibberellin response element (GARE), box‐1 and pyrimidine boxes, as well as elements that may lend specificity to GA‐regulated expression, such as the Opaque‐2‐similar element (O2S), and TRE and CRE motifs. One of the most striking features of all of these studies of the molecular basis of GA action is the interaction of GA‐dependent regulatory elements with those of other factors such as ABA. GA‐response elements also appear to be conserved between disparate GA‐response systems. For example, Myb transcription factors appear to regulate a multitude of GA‐induced genes in cereal aleurone as well as to alter GA responses when expressed in Arabidopsis. Thus the study of GA signal transduction and response systems is highlighting the conservation of regulatory elements used by plants. These common factors, used by distinct signal transduction systems, provide a molecular basis for the integration of the GA signal with other growth regulators that is the hallmark of plant growth and development.

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Gibberellins and Stem Growth as Related to Photoperiod in Silene armeria L.

Cited by 88 publications

References 12 publications

ent-Kaurene Biosynthesis Is Enhanced by Long Photoperiods in the Long-Day Plants Spinacia oleracea L. and Agrostemma githago L

ent-Kaurene Biosynthesis Is Enhanced by Long Photoperiods in the Long-Day Plants Spinacia oleracea L. and Agrostemma githago L

Gibberellins and Parthenocarpic Ability in Developing Ovaries of Seedless Mandarins

Gibberellins: regulating genes and germination

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