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Effect of light and gibberellic acid on cell division in the first foliage leaf of durum wheat (Triticum durum Desf.)

Baroncelli, S. (Pisa Univ. (Italy). Ist. di Genetica) ; Cavallini, A ; Lercari, B ; Cionini, P.G ; D'Amato, F

Planta, 1988-02, Vol.173 (2), p.257-262 [Periódico revisado por pares]

Berlin: Springer-Verlag

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Título:
Effect of light and gibberellic acid on cell division in the first foliage leaf of durum wheat (Triticum durum Desf.)
Autor: Baroncelli, S. (Pisa Univ. (Italy). Ist. di Genetica) ; Cavallini, A ; Lercari, B ; Cionini, P.G ; D'Amato, F
Assuntos: ACIDO GIBERELICO ; Agronomy. Soil science and plant productions ; ARTIFICIAL LIGHT ; Biological and medical sciences ; Blattwachstum ; Cell division ; Cell growth ; Cell kinetics ; Cell physiology ; Durum wheat ; Economic plant physiology ; Epidermal cells ; FEUILLE ; FITOCROMA ; Fluence ; Fundamental and applied biological sciences. Psychology ; Gibberellin ; GIBBERELLINE ; Gibberellins ; Growth and development ; HOJAS ; Irradiation ; LEAVES ; Lichtfarbe ; LUMIERE ARTIFICIELLE ; LUZ ARTIFICIAL ; Meristems ; MITOSE ; MITOSIS ; Natural and artificial inductions ; Phytochrom ; PHYTOCHROME ; PHYTOCHROMES ; Plant physiology and development ; Plants ; Receptors ; Triticum ; TRITICUM DURUM ; Wachstumsregulator ; Zellteilung
É parte de: Planta, 1988-02, Vol.173 (2), p.257-262
Notas: 88G0192
F62
ObjectType-Article-1
SourceType-Scholarly Journals-1
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Descrição: The present paper is part of a research program which aims at a quantitative analysis of the effects of light and gibberellic acid (GA3) on growth of the first foliage leaf in durum wheat (Triticum durum Desf.). Since leaf growth is the combined result of the increase in cell number (cell division) and cell enlargement, the influence of light and GA3 treatment on cell division in the basal meristem of the first leaf in two cultivars, Cappelli and Creso, was investigated. Creso is a short-strawed cultivar carrying the Gai 1 gene which influences both plant height and insensitivity to applied GA3. Cell division, as measured by mitotic index, was similar in darkness, continuous red light and dichromatic irradiation (far-red plus red), while lower mitotic rates were observed under continuous far-red light: this indicates that the response of cell division is modulated by a high-irradiance reaction of phytochrome in both cultivars. The two cultivars showed different responses to blue light. In Cappelli, blue light and dichromatic irradiation (blue plus red) gave lower mitotic indices than the dark control, indicating the action of a specific blue-light-absorbing photoreceptor, whereas in Creso the response kinetics to all light regimes which included blue light were more complex. On the basis also of the results obtained with GA3 application in Cappelli, it appears that (i) the hormonal treatment is able to change the pattern of mitotic index only in the presence of the action of a blue-light receptor and (ii) the different responses of the two cultivars could be the result of different endogenous hormonal levels. The importance of the observations in relation to the data for first-leaf longitudinal growth reported in a previous paper (Baroncelli et al. 1984, Planta 160, 298—304) is discussed.
Editor: Berlin: Springer-Verlag
Idioma: Inglês

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Effect of light and gibberellic acid on cell division in the first foliage leaf of durum wheat (Triticum durum Desf.)

Baroncelli, S. (Pisa Univ. (Italy). Ist. di Genetica) ; Cavallini, A ; Lercari, B ; Cionini, P.G ; D'Amato, F

Berlin: Springer-Verlag

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