Apical reactions to gibberellic acid application according to the genotype inSilene armeria

Besnard-Wibaut, Christiane; Noin, M.; Cochet, Thierry

doi:10.1007/bf02879877

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…The accumulation of endogenous GA1 in elongating shoots of LD-growing plants appears, therefore, to initiate the processes for stem growth. In this strain of Silene, although flowering and stem elongation are both induced by LD, flowering cannot be promoted by exogenous GAs (Cleland and Zeevaart 1970;Wellensiek 1973;Besnard-Wibaut et al 1983, 1985. The height of Silene plants growing under different photoperiodic conditions, however, appears to be related to quantitative changes in GA levels.…”

Section: Introductionmentioning

confidence: 95%

Cellular changes induced by exogenous and endogenous gibberellins in shoot tips of the long-day plant Silene armeria

Talón

Tadeo

Zeevaart

1991

Planta

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Stem elongation and flowering are two processes induced by long-day (LD) treatment in Silene armeria L. Whereas photoperiodic control of stem growth is mediated by gibberellins (GAs), the flowering response cannot be obtained by GA applications. Microscopic observations on early cellular changes in the shoot meristem following LD induction or GA treatment in short days (SD) were combined with GA analyses of stem sections at various distances below the shoot apex. The earliest effects of both LD and GA induction on the subapical meristem were an increase in the number of cells per cell file and a reduction of cell length in the meristematic tissue approx. 1.0-3.0 mm below the shoot apex. Within 8 d after the beginning of LD induction or after GA application, the cells in the subapical meristem were oriented in long files. In induced tips, cellulose deposition occurred mostly in longitudinal walls, indicating that many transverse cell divisions had taken place which, in turn, increased the length of the stem. In contrast to LD induction, GA treatments did not promote the transition from the vegetative to the floral stage. Endogenous GAs were analyzed by selected ion monitoring (SIM), using labeled internal standards, in extracts from transverse sections of the tip at various distances below the apical meristem. In control plants, the levels of the six 13-hydroxy GAs studied (GA53, GA44, GA19, GA20, GA1, and GA8) decreased as the distance from the apical meristem increased. Except for GA53, GA levels were higher in tips of LD-induced plants, particularly in the meristematic zone approx. 0.5-1.5 mm below the apical meristem. In comparison with SD, the highest increase observed was for GA1, the content of which increased 30-fold in the zone 0.5-3.5 mm below the shoot apex. These data indicate a spatial correlation between the accumulation of GA1 and its precursors, and the enhanced mitotic activity which occurs in the subapical meristem of elongating Silene apices.

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Section: Introductionmentioning

confidence: 95%

Cellular changes induced by exogenous and endogenous gibberellins in shoot tips of the long-day plant Silene armeria

Talón

Tadeo

Zeevaart

1991

Planta

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“…This specific distribution of cdc2 expression in the root apex exactly parallels the pattern ofmitotic activity (22). Likewise, in the vegetative shoot apex, the distribution of cdc2 transcripts exactly corresponds to the pattern of mitotic activity and [3H]thymidine incorporation (23)(24)(25). The discrete patterns of cdc2 hybridization observed during flower development argue for a similar relationship between cdc2 expression and cell proliferation.…”

Section: Discussionmentioning

confidence: 71%

Spatial pattern of cdc2 expression in relation to meristem activity and cell proliferation during plant development

1992

Trends in Genetics

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The control of flower initiation by gibberellin in Helianthus annuus L. (sunflower), a non-photoperiodic plant

Almeida

Pereira

1996

Plant Growth Regul

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The involvement of gibberellins in the control of flowering of sunflower was studied by direct application of GA3 to the apex of the plants, analysis of the endogenous levels of gibberellin-like substances at different plant ages, and indirectly by the application of paclobutrazol, an inhibitor of gibberellin synthesis. GA3 speeded-up flower initiation and floral apex development. The time of GA3 application was more critical than the amount of GA3 applied. The endogenous levels of gibberellin-like compounds increased significantly by day 15 after sowing. The application of paclobutrazol markedly delayed floral initiation and this effect was also dependent on plant age. Both GA3 and paclobutrazol had their greatest effects between 10 and 20 days after sowing suggesting that an increase in gibberellins in that time period plays a role in floral initiation.

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Apical reactions to gibberellic acid application according to the genotype inSilene armeria

Cited by 5 publications

References 13 publications

Cellular changes induced by exogenous and endogenous gibberellins in shoot tips of the long-day plant Silene armeria

Cellular changes induced by exogenous and endogenous gibberellins in shoot tips of the long-day plant Silene armeria

Spatial pattern of cdc2 expression in relation to meristem activity and cell proliferation during plant development

The control of flower initiation by gibberellin in Helianthus annuus L. (sunflower), a non-photoperiodic plant

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