Comparative leaf architecture of Hedychium coronarium J. Koenig (Zingiberaceae) and Typha domingensis Pers (Typhaceae)
Keywords:
leaf morphology, foliar orientation, foliar structure, taboa, lirio-do-brejo.Abstract
Different strategies in light interception by plants might dictate structural leaf variation. The aim of this study was to compare the morphoanatomy of two species, Hedychium coronarium and Typha domingensis, which cohabit in places with high light and overflowed soil. All leaves of T. domingensis are vertically oriented, while only the youngest leaves of H. coronarium are vertical. The leaf characteristics analyzed were: leaf area, dry weight, total length, width and thickness of the tip, mid and base regions, stomata density, and angle of insertion. The vertical orientation, amphistomy, symmetrical, mesophyll, and lacunar system allow leaves of T. domingensis to have great areas. Leaves of H. coronarium have higher stomata number in the abaxial face, hypoderm, assimetrical mesophyll and folding of the margins, which, apparentely, are preventive measures against photoinibition. The success of colonization and rapid proliferation of these species are due, partialy, to their foliar architecture.
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