On the Mechanics of Growth and Morphogenesis in Hydroid Polyps

Beloussov, L. V.; Dorfman, Jehudith

doi:10.1093/icb/14.2.719

Cited by 21 publications

(12 citation statements)

References 5 publications

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“…Because of this effect, the amplitudes of cell rotations, and hence absolute length increase per each GP in adjacent walls, are greater than in non-adjacent ones (the outer walls of LRs). As shown experimentally (Beloussov, 1973;Beloussov & Dorfman, 1974) counterphase activity is the main factor in the more intense growth of the median (inner) walls of LRs when compared with their outer walls; and this leads to the lateral bending of LRs. It is suggested that variation in the values of counterphase effect are among the main factors determining the shapes and branching patterns in the Sertulariidae.…”

Section: Growth Pulsations (Gp)mentioning

confidence: 73%

“…This means that the transversad cell rotations in one of the adjacent walls coincide in most cases with the reverse rotations in another ( Fig. 3; see also Beloussov & Dorfman, 1974). Because of this effect, the amplitudes of cell rotations, and hence absolute length increase per each GP in adjacent walls, are greater than in non-adjacent ones (the outer walls of LRs).…”

Section: Growth Pulsations (Gp)mentioning

confidence: 85%

“…The central idea of the model is that in the regions of a nonzero local curvature the radial component of a pressure force is roughly proportional to the local curvature and is directed towards its increase (see also Beloussov, 1973;Beloussov & Dorfman, 1974). Taking as a basis the real or idealized shape of an outgrowth tip, the formation of a typical trefoiled (in transverse section) shape of a hydranth bud including hypostomal protuberance and the common tentacle rudiment could be simulated ( Fig.…”

Section: Growth Pulsations (Gp)mentioning

confidence: 99%

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Basic morphogenetic processes in Hydrozoa and their evolutionary implications: an exercise in rational taxonomy

Beloussov

1991

Hydrobiologia

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Species-specific morphology in thecate hydroids is considered as a function of 2 fundamental morphogenetic characteristics: parameters of growth pulsations and the relation between the migratory activities of the endo-and ectodermal cells of the growing tips. Comparative, experimental and modelling data are presented suggesting that increases in the values of these parameters lead to gradual transformation of the narrow tubular rudiments of primitive thecates to the more transversely extended and later bilaterally symmetrical morphologies of advanced forms. There is a corresponding change in the mode of branching, from stolonal through alternate to opposite, with densely packed hydranths and hydro thecae. The relations between the traditional systematic approach to this group and the present ontogenetically based interpretation are discussed.

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Section: Growth Pulsations (Gp)mentioning

confidence: 73%

Section: Growth Pulsations (Gp)mentioning

confidence: 85%

Section: Growth Pulsations (Gp)mentioning

confidence: 99%

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Basic morphogenetic processes in Hydrozoa and their evolutionary implications: an exercise in rational taxonomy

Beloussov

1991

Hydrobiologia

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“…(b) At the supracellular level: the demonstration of intracellular contractile systems in developing rudiments (Baker andSchroeder, 1967 Wessells et al, 1971) supports the assumption that mechanical stress in cell layers may play a principal role in morphogenetic processes (Beloussov and Dorfman, 1974). In a recent study on mechanical stress during amphibian embryonic development from the late blastula until the early tail bud stage, it was shown that periodically drastic transformations of the stress pattern occur, interspersed with periods in which the pattern of stress remains topologically constant (Beloussov et al, 1975).…”

Section: The Pattern Of Association Between Cellsmentioning

confidence: 92%

Shape: Its development and regulation capacity during embryogenesis

Herkovits¹,

Faber

1978

Acta Biotheor

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Although several theoretical approaches consider general methods for dealing with shape, recent observations and experimental data show that embryos exhibit marked changes in the properties of the biological material involved in shape development and shape regulation capacity. In vivo experiments have shown that the amphibian embryo gradually develops from a situation in which it is not able to maintain its shape to one in which it can not only maintain its shape but also possesses a maximal tolerance towards deformation together with a maximal shape regulation capacity. So far two especially clear conclusions have emerged: (i) the form of the embryo appears to be determined by cell activities intrinsic to each stage, and (ii) the morphogenetic programme can be executed normally within wide limits notwithstanding dramatic deformations of the embryo during quite a long period. Thus the hypothesis may be advanced that shape and morphogenesis to some extent become independent phenomena during embryonic development.

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“…In this paper we took into account the series of papers by Berrill (1949aBerrill ( , b, c, 1950, and 'the theory of biological (embryonic) field' by Gurwitsch (1922) and his followers (Beloussov & Ostromova, 1969;Beloussov et al, 1972;Beloussov & Dorfman, 1974), including the only papers of their kind by Beloussov (1975Beloussov ( , 1991 on the 'parametric system of hydroids'. However, such works are still few in number, so the method of morphogenetic analysis in classification of forms remains poorly developed.…”

Section: Introductionmentioning

confidence: 99%

Morphogenetic evolution of hydroid colony pattern

Marfenin

Kosevich

2004

Hydrobiologia

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A scheme of evolution of hydrozoan colony pattern is proposed based upon the consideration of macromorphogenesis. Four main processes play decisive roles: (1) hard skeleton formation by soft tissues, (2) changes in duration of the growth phase relative to the transition to differentiation in interdependent zones of growth, (3) ratio in growth rates between adjacent zones of growth within the rudiment, the shoot, or the whole colony, and (4) spatial relationships among growth zones. The main tendency in morphological evolution of the hydroids is an increasing integration of the colony as revealed by increasing complexity of its structure. That is from a temporary colony towards the permanent one with highly organised shoots, as hydranths and branches are localised in a strictly arranged manner. An analysis of diverse data allows one to state that the main morphogenetic mechanism of increasing complexity in the hydroid colony is convergence, then fusion, of adjacent growth zones, a variant of heterochrony.

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On the Mechanics of Growth and Morphogenesis in Hydroid Polyps

Cited by 21 publications

References 5 publications

Basic morphogenetic processes in Hydrozoa and their evolutionary implications: an exercise in rational taxonomy

Basic morphogenetic processes in Hydrozoa and their evolutionary implications: an exercise in rational taxonomy

Shape: Its development and regulation capacity during embryogenesis

Morphogenetic evolution of hydroid colony pattern

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