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Configurational forces for growth and shape regulations in morphogenesis

Charletta P., Ambrosi D., Maugin G.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2012

Vol. 60, nr 2

253-257

Morphogenetic theories investigate the mechanisms of creation and regulation of definite biological forms in living organisms. The incredible diversity of shapes and sizes is generated through a barely unknown coordination of biochemical processes occurring at molecular levels. Such a crosstalk not only defines the rules of a robust scheme of matter differentiation, but it also has the capacity to adapt with respect to some variations of the environmental conditions. In this work, we propose a continuum model of growth and mass transport for biological materials during morphogenetic processes. Using the theory of configurational forces, we define the thermomechanical bases for understanding how both the mechanical and the biochemical states can orchestrate growth. The model is successfully applied to describe the morphogen-driven growth control in the imaginal wing disc of Drosophila melanogaster.

Mikrorozmnażanie roślin rożnika przerośniętego (Silphium perfoliatum L.) w kulturach in vitro

Figas A., Tomaszewska-Sowa M., Lisiak W.

Ekologia i Technika

2010

R. 18, nr 5

237-242

Celem pracy było podjęcie próby mikrorozmnażania rożnika przerośniętego w kulturach in vitro. W doświadczeniu zbadano zdolność kilku wybranych eksplantatów (fragmenty liścieni, ogonka liściowego, wierzchołki pędu) do regeneracji. Badane eksplantaty wykładano na pożywkę MS z dodatkiem regulatorów wzrostu: NAA (kwas naftylooctowy - auksyna) i BAP (6-benzyloami-nopuryna - cytokinina) w różnych kombinacjach stężeń. Najwięcej pędów bocznych rozwijało się z eksplantatów wierzchołkowych pędu na pożywce zawierającej 5 mg l -1BAP i 1mg l-1 NAA.

Cup plant (Silphium perfoliatum L.) is a perennial herb belongs to Asteraceae family, and it is native only to middle and eastern part of USA and Canada. Cup plant was brought to Europe in the 18th century for its ornamental value. Nowadays, interest of this plant grows up because of its useful utilitarian traits. Cup plant may be cultivated as a medical plant, energetic plant, ornamental plant, melliferous plant and reclamation plant. At present, there is no enough seed of cup plants in Poland. The aim of present paper was in vitro micropropagation of cup plant, the regeneration ability of some explants of cup plant (cotyledon fragments, petiole fragments and shoot tips) was studied. Explants were cultured on Murashige i Skoog'a (MS) (1962) [17] medium with different concentration of NAA (1-naphthaleneacetic acid- auxin) and BAP (6-benzyloaminopurine - cytokinin). The lateral shoots were obtained from shoot tips explants cultured on MS medium supplemented with 5 mgdm-3 BAP and l mg drrr3 NAA.