Shoot Histogenesis: The Early Effects of Gibberellin Upon Stem Elongation in Two Rosette Plants

Sachs, Roy M.; Bretz, Charles F.; Lang, Anton

doi:10.2307/2439199

Cited by 72 publications

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“…This region was invariably described and diagrammed as "subapical" (Sachs et al, 1959a(Sachs et al, , 1959b, reminiscent of the root's transition zone, described above. Thus, the shoot apex includes a zone immediately proximal to the meristem proper that has special properties with respect to cell growth and division.…”

Section: A Transition Zone In the Shoot Meristem?mentioning

confidence: 99%

“…In the late 1950s, Sachs and Lang published a series of studies in which data were interpreted to support a mitogenic role for gibberellin (Sachs and Lang, 1958;Sachs et al, 1959aSachs et al, , 1959b. Every 24 hr, they injected the hormone into the bases of rosette leaves proximal to the shoot apices of Hyoscyamus niger and Samolus parviflorus.…”

Section: S Gibberellin a Mitogen?mentioning

confidence: 99%

“…First, Sachs and Lang's data suggest that longitudinal extension of the meristem and its proximal flank had occurred before cell sizes were seen to decrease (Sachs et al, 1959b). Because full-size cells are not added to plant axes like bricks to a wall and because greater cell numbers were reported in these tissues after gibberellin treatment, apical cells must have elongated concomitant with division.…”

Section: S Gibberellin a Mitogen?mentioning

confidence: 99%

“…Because full-size cells are not added to plant axes like bricks to a wall and because greater cell numbers were reported in these tissues after gibberellin treatment, apical cells must have elongated concomitant with division. Yet Sachs and Lang discounted the contribution of elongation, reporting that "the entire increase in stem length must be attributed to the formation of new cells" (Sachs et al, 1959b). Second, mitotic spindles in virtually all "gibberellin-induced" cell divisions were oriented longitudinally, that is, cells that divided as a consequence of gibberellin treatment invariably positioned their new cross-walls so as to bisect an extending longitudinal dimension.…”

Section: S Gibberellin a Mitogen?mentioning

confidence: 99%

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Why Do Plant Cells Divide?

Jacobs

1997

Plant Cell

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Section: A Transition Zone In the Shoot Meristem?mentioning

confidence: 99%

Section: S Gibberellin a Mitogen?mentioning

confidence: 99%

Section: S Gibberellin a Mitogen?mentioning

confidence: 99%

Section: S Gibberellin a Mitogen?mentioning

confidence: 99%

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Why Do Plant Cells Divide?

Jacobs

1997

Plant Cell

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“…mais feixes com tecidos adultos apresentaram menor quantidade de fibras e parênquima mais desenvolvido quando comparados à testemunha. Esses resultados estão de acordo com Sachs et al (1959), que verificaram após a aplicação de GA na planta bianual Hyoscyamus e em plantas de dias longos de Samolus, um considerável aumento na atividade mitótica, observado na medula, córtex e no tecido vascular abaixo do meristema apical. Sendo também observado por Mauseth (1976) que o ácido giberélico causou atividade mitótica no meristema da gema axilar de Opuntia polyacantha, porém, o meristema não aumentou de dimensão.…”

Section: Efeitos Do Ga E Do Cepa Na Anatomia Do Nóunclassified

Efeitos de giberelina e ethephon na anatomia de plantas de cana-de-açúcar

Martins

Castro

1999

Pesq. agropec. bras.

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RESUMO -O presente trabalho teve como finalidade analisar os efeitos da aplicação de giberelina (GA) e do ethephon (CEPA) na anatomia de plantas de cana-de-açúcar. Para o estudo da anatomia de caules e folhas foi realizada pulverização de plantas jovens a partir de sementes. Após 216 dias da semeadura, realizaram-se cortes das folhas +4, da região do nó +10 e dos entrenós +10 e montagem de lâminas permanentes. Observou-se que o tratamento com GA 50 mg L -1 manteve intensa atividade meristemática, havendo contínua formação de feixes vasculares com menor quantidade de fibras de esclerênquima. O GA 50 mg L -1 provocou diminuição em número e tamanho de células buliformes nas folhas +4. Verificou-se que CEPA 1.200 mg L -1 , inibiu a atividade meristemática na região do nó +10, reduziu a quantidade de fibras de esclerênquima dos feixes vasculares e aumentou o número de células buliformes.Termos para indexação: Saccharum officinarum, reguladores vegetais, ácido giberélico. EFFECTS OF GIBBERELLIN AND ETHEPHON ON THE ANATOMY OF SUGAR CANE PLANTSABSTRACT -This research was carried out to study the effects of gibberellin (GA 50 mg L ) on the anatomy of sugar cane. Seed derived seedlings were sprayed with the growth regulators. Various plant parts (+4 leaves, +10 node, and +10 internode) were harvested at 216 days after sowing, sectioned and mounted on permanent slides. GA treated plants displayed intense meristematic activity, with continuous production of vascular bundles with reduced amount of fibers. The same treatment resulted in lower number and size of buliform cells in +4 leaves. CEPA treated plants showed lower meristematic activity of +10 node, reduced amount of fibers in the vascular bundles, and increased the number of buliform cells.Index terms: Saccharum officinarum, plant growth regulators, gibberellic acid. para o país. Historicamente, as pesquisas agrícolas têm sido voltadas principalmente para a obtenção de maiores incrementos na produção total da cultura, e extração de seus subprodutos a partir do colmo (açúcar, álcool, celulose e o biogás), mediante o aprimoramento das técnicas agronômicas convencionais para se otimizar as produções. Atualmente, vem sendo incentivada a utilização de técnicas mais avançadas, como a aplicação de reguladores vegetais. Os reguladores vegetais agem alterando a morfologia e a fisiologia da planta, podendo levar a modificações qualitativas e quantitativas na produção. A utilização dos reguladores vegetais poderá ser uma alternativa compensadora aos investimentos e objetivos propostos à cultura da cana, por possibilitarem incrementos no teor de sacarose, precocidade de maturação e aumento na produtividade.

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Effects of Gibberellin on Gamma‐irradiated Wheat

Haber

Luippold

1960

American J of Botany

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Haber, Alan H., and Helen J. Luippold. (Oak Ridge National Laboratory,2 Oak Ridge, Tenn.) Effects of gibberellin on gamma‐irradiated wheat. American Jour. Bot. 47(2): 140—144. Illus. 1960.–After receiving large doses of gamma rays, wheat grains can germinate and grow into small seedlings, either in water or in a solution of gibberellic acid, without undergoing any mitosis. Gibberellic acid stimulates growth of plants from grain given twice the dose that abolishes all detectable mitotic activity. Therefore, it must stimulate growth of these irradiated plants by cell expansion alone. Growth stimulation in shoots from such irradiated grain was reflected in increased dry matter content and other responses characteristic of gibberellin treatment. Comparison of the shoot height‐dose curves for plants grown in water and those in gibberellin suggest that cell division per se does not contribute greatly to the gibberellin stimulation of growth in unirradiated young wheat seedlings. The effect of gibberellic acid on plants from grain irradiated sufficiently to prevent subsequent mitotic activity was on the total extent of growth, not only on the rate. The general ineffectiveness of gibberellin on mature tissues can not be attributed to the cells having reached the maximum size that they were potentially capable of attaining, but must be caused by a physiological incapacity of the cells to respond to gibberellin treatment. These results are discussed in connection with recent reports that stimulation of growth by gibberellin can be attributed solely to an increase in cell number.

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Shoot Histogenesis: The Early Effects of Gibberellin Upon Stem Elongation in Two Rosette Plants

Cited by 72 publications

References 0 publications

Why Do Plant Cells Divide?

Why Do Plant Cells Divide?

Efeitos de giberelina e ethephon na anatomia de plantas de cana-de-açúcar

Effects of Gibberellin on Gamma‐irradiated Wheat

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