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Acta Amazonica

Print version ISSN 0044-5967On-line version ISSN 1809-4392

Acta Amaz. vol.6 no.4 Manaus Dec. 1976

https://doi.org/10.1590/1809-43921976064409 

BOTÂNICA

Sobre parâmetros eco-fisiológicos das folhas. I - Considerações básicas

Eduardo Lleras* 

*— Instituto Nacional de Pesquisas da Amazônia, Manaus.


Resumo

Neste primeiro trabalho de uma série sobre a eco-fisiologia das folhas, são considerados alguns aspectos básicos da morfologia e anatomia das folhas com relação a condições ambientais. Os principais passos evolutivos que deram origem às folhas são analizados e postuladas pressões de seleção que puderam atuar como fatores na evolução das folhas. A study of the water relations of plants, and especially of the formative effects of water on plant growth has recently been somewhat neglected. These relations provide a promising opportunity, however, to approach some of the problems of plant morphogenesis from a direction different from that of most experimental work today. (Sinnott, 1960).

Summary

In this initial paper of a series on physio-ecological parameters in leaves, some basic aspects of foliar morphology and anatomy are considered in relation to environmental conditions, the main evolutionary stages that gave rise to leaves are analized. The basic morphology and anatomy of leaves is traced throughout the evolutionary history of plants, from a postulated Rhynia-like ancestor to the more recent (in an evolutionary sense) types of leaves. Some of the problems and selective pressutes that might help elucidate and interpret leaves from a physio-ecological stand point are analized. Also considered is the possible influence, in view of current data, that leaves might have on the structure of the stele. Some of the basic factors that might excert selective pressure, such as temperature, light and water are also considered.

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