Morphology and mechanical properties of junctions: Implications on the success of clonal spread of cacti

NAVAS, D.; ALMIRON, MARTIN GUILLERMO; PANTANO, V.; MARTÍNEZ CARRETERO, EDUARDO

JOURNAL OF ARID ENVIRONMENTS

ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2016 vol. 128 p. 8 - 11

0140-1963

Opuntioid cacti reproduce asexually through separation and subsequent rooting of stems (cladodes inplatyopuntias; joints in cylindropuntias). Consequently, the force that keeps them together must beovercome. This work assesses the morphometry and disjunction force of joints in Tephrocactus aoracanthus.Morphologically, during their maturation, joints change in shape from oval to spherical,resulting in the youngest being significantly shorter and lighter than the oldest ones. Both criticalbending moment and section modulus of junctions resulted in weaker connections on younger jointswith respect to older ones, determining that young joints can be separated with less force applied.According to that, their deflection angle is smaller compared to older joints. In relation to other species,the junction of T. aoracanthus is more fragile in both the youngest and oldest joints. This mechanismcould favor the spread of T. aoracanthus and its colonization of sites unfavorable for the establishment ofits seedlings.