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The size of some organs that form the plant vary with growth in a proportional or isometric manner, which facilitates their evaluation and sequential study based on minimal characteristics. Other structures present, under certain circumstances, an unharmonious or non-isometric pattern of growth. These relationships were evaluated in the pea plant using four assays, three in open field and one under greenhouse conditions, in high Andean tropic environments. As a result, the leaves showed isometric proportionality in the size of the constituent parts (leaflets, petioles and stems), whereas the different environmental conditions affected the size relationships among the leaves, the internodes and the pods. Under greenhouse, the internodes were longer than in the open field for the same size leaf. Analogously, the pods of greenhouse plants were smaller than those in an open field for the same length of internodes. These results contributed to partially explain the way the plant distributes its assimilates to form structures and the influence of the environment in such morphological relationships. The isometric leaf growth allowed the establishment of a predictive model of the area of the pea compound leaf based on the area of the first leaflet pair and the total number of leaflets.

ciencia y tecnología agropecuaria

Área de la hoja compuesta y variaciones de forma en los fitómeros de arveja (Pisum sativum L.) en respuesta a diferentes ambientes de Trópico Alto Andino