Le phenomene d'heteroblastie chez les vegetaux: Comment l'expliquer?

Lambert, Cécile; Buis, Roger; L'Hardy‐Halos, Marie‐Thérèse

doi:10.1007/bf00709434

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…L‐system modeling has been used successfully to model iterative developmental processes in both land plants and algae (Pruzinkiewicz 1999), most notably for members of the Ceramiales (Garbary and Corbit 1992, Corbit and Garbary 1993, Schneider et al. 1994, Lambert et al. 1995, Luck et al.…”

Section: Discussionmentioning

confidence: 99%

EARLY DEVELOPMENT PATTERN OF THE BROWN ALGA ECTOCARPUS SILICULOSUS (ECTOCARPALES, PHAEOPHYCEAE) SPOROPHYTE¹

Bail

Billoud

Maisonneuve

et al. 2008

Journal of Phycology

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The distant phylogenetic position of brown macroalgae from the other multicellular phyla offers the opportunity to study novel and alternative developmental processes involved in the establishment of multicellularity. At present, however, very little information is available about developmental patterning in this group. Ectocarpus siliculosus (Dillwyn) Lyngb. has uniseriate filaments and displays one of the simplest architectures in the Phaeophyceae. The aim of this study was to decipher the morphogenetic steps that lead to the development of the Ectocarpus sporophyte. We carried out a detailed morphometric study of the events that occurred between gamete germination and the 100-cell stage. This analysis was performed on two ecologically distant isolates to assess plasticity in developmental patterning within this species. Cell sizes were measured in both isolates, allowing the definition of two main cell types based on their shape (round and elongated). On average, the filament is composed of about 40% round cells, which are present in the central region of the filament, but different combinations of the two cell types within filaments were observed and quantified. Young sporophytes grew apically, with elongated cells progressively differentiating into round cells. Secondary filaments emerged preferentially on round cells, primarily from the older central cells. Statistical analyses showed that the pattern of branching was regulated to ensure a stereotyped architecture. This description of the developmental patterning during the growth of the E. siliculosus sporophyte will serve as a base for more detailed studies of development, in this species and in brown algae in general.

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Section: Discussionmentioning

confidence: 99%

EARLY DEVELOPMENT PATTERN OF THE BROWN ALGA ECTOCARPUS SILICULOSUS (ECTOCARPALES, PHAEOPHYCEAE) SPOROPHYTE¹

Bail

Billoud

Maisonneuve

et al. 2008

Journal of Phycology

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Caracterisation de la structure d'un processus de croissance

Buis

L'Hardy‐Halos²,

Lambert

1996

Acta Biotheor

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The analysis of a growth kinetics y(t) is carried out using the generalized logistic model of Richards -Nelder. Two types of processes, termed mono-and multi-logistic, can be distinguished.In a mono4ogistic process, the phenomenon is adequately described by only one logistic function. The growth kinetics is then characterized by the properties of eseh of phases (71 to G4, with boundaries defined by the singular points Fm~x, Vma x and Fmi n (Buis, 1991(Buis, , 1993. The growth structure (temporal or diachronie structure) is defined by the relative contribution of the various phases to the expression of the total growth (duration, growth amount, in relative values per phase, independently of Ym~0" This temporal distribution of the growth activity is a discretized representation of the 1 Ce travail a 6t6 r6alisd dans le cadre du programme de recherche du Groupe "Physiologic, Phylog6nie et Morphogdn~se des Algues'.

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Lambert

L'Hardy‐Halos

1999

Acta Biotheoretica

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Le phenomene d'heteroblastie chez les vegetaux: Comment l'expliquer?

Cited by 4 publications

References 22 publications

EARLY DEVELOPMENT PATTERN OF THE BROWN ALGA ECTOCARPUS SILICULOSUS (ECTOCARPALES, PHAEOPHYCEAE) SPOROPHYTE¹

EARLY DEVELOPMENT PATTERN OF THE BROWN ALGA ECTOCARPUS SILICULOSUS (ECTOCARPALES, PHAEOPHYCEAE) SPOROPHYTE¹

Caracterisation de la structure d'un processus de croissance

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Le phenomene d'heteroblastie chez les vegetaux: Comment l'expliquer?

Cited by 4 publications

References 22 publications

EARLY DEVELOPMENT PATTERN OF THE BROWN ALGA ECTOCARPUS SILICULOSUS (ECTOCARPALES, PHAEOPHYCEAE) SPOROPHYTE1

EARLY DEVELOPMENT PATTERN OF THE BROWN ALGA ECTOCARPUS SILICULOSUS (ECTOCARPALES, PHAEOPHYCEAE) SPOROPHYTE1

Caracterisation de la structure d'un processus de croissance

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About

EARLY DEVELOPMENT PATTERN OF THE BROWN ALGA ECTOCARPUS SILICULOSUS (ECTOCARPALES, PHAEOPHYCEAE) SPOROPHYTE¹

EARLY DEVELOPMENT PATTERN OF THE BROWN ALGA ECTOCARPUS SILICULOSUS (ECTOCARPALES, PHAEOPHYCEAE) SPOROPHYTE¹