Abstract
Allometric relationships (defined as correlation coefficients between plant mass - stem diameter, plant mass - stem height and stem diameter - stem height) in plants of <em>Tagetes patula</em> L. (<em>Brassicaceae</em>) var. "Tangerine" were analyzed. Competing and non-competing plants were compared in a glasshouse experiment. Competing plants were grown in broad range of densities, from 200 to 6000 individuals • m<sup>-2</sup>. For non-competing plants no allometric relationships were observed, while for competing plants they were strong, irrespective of density treatment used. Gradual changes of plant morphology (plant mass, stem diameter, stem height and height/mass ratio) with the increase of competition intensity were also analyzed.The present study clearly showed, that the intraspecific competition influenced allometric relationships between height, mass and stem diameter of Tagetes patula.
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