FINLEY, David S.. Patterns of calcium oxalate crystals in young tropical leaves: a possible role as an anti-herbivory defense. []. , 47, 1-2, pp.27-31. ISSN 0034-7744.

^len^aCalcium oxalate crystal formation and leaf toughness were measured and compared in five species, (Cyclanthus subpalmata, Pandanus leram, Crinum amabile, Heliconia longiflora and Guzmania zahnii) pre-selected for known leaf raphide production and toughness. Nine to eleven representative individuals from each species were randomly selected for the same microenvironment. The study was conducted in Las Cruces, Costa Rica. Leaves from each species were classified as two age classes: young and mature. Leaf crystal number was quantified by light microscopy. Leaf toughness was measured with a penetrometer. For all five species, the number of crystals was highest in young leaves and lowest in mature leaves. In addition, crystal formation was inversely related both to the leaf age class and to leaf toughness. It is proposed that crystal formation may be an alternative plant defense to toughness in young leaves.^les^aSe comparó cristales de oxalato de calcio y la dureza de la hoja en cinco especies, (Cyclanthus subpalmata, Pandanus leram, Crinum amabile, Heliconia longiflora, y Guzmania zahnii), pre-seleccionadas por tener ráfidos, clasificando las hojas como jóvenes y viejas. Se contó los cristales por microscopia de luz. La dureza de la hoja fue medida con un penetrómetro. En todas los especies, la cantidad de cristal fue mayor en hojas jóvenes y la formación estuvo inversamente relacionada con edad y dureza de la hoja. La formación de cristales puede ser una defensa alternativa a la dureza de las hojas jóvenes.

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