Architectural models for apical patterns in Gelidium (Gelidiales, Rhodophyta): hypothesis of growth |
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Authors: | Dení Rodríguez Vargas Ligia Collado-Vides |
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Institution: | Laboratory of Phycology, Faculty of Sciences, Mexico National University, A.P. 70–620, Coyoacán D.F. Mexico |
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Abstract: | The great morphological variation in the apical region of main axes and branches in species of Gelidium and Pterocladia suggests different patterns of growth. Those patterns have been reconstructed from the ontogenetic sequence of morphological stages and regeneration of the apex. Using the architectural approach, models for four species of Gelidium from the Pacific coast of central Chile and the Pacific coast of Mexico's tropical region, were constructed based on the following criteria: growth pattern, specialization of laterals, symmetry, apical dominance and rhythm of apical and lateral growth. Those models allow for a formal evaluation of apical differences between species. |
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Keywords: | apex development architectural model Gelidiales Gelidium growth patterns Pacific red algae |
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