Abstract
Embryological data of systematic significance to the family Araceae are reviewed and analyzed, with special attention given to the determination of character-state polarities. Character-states considered primitive within the family include: presence of endothecial thickenings; binucleate, starchless pollen; anatropous, crassinucellate ovules with a thick nucellar cap and a single, unbranched funicular bundle; solanad or caryophyllad embryogeny; helobial endosperm development, with 2–8 cells in the chalazal chamber andab initio cellular division in the micropylar chamber; and endosperm present in ripe seeds. The phylogenetic implications of these conclusions are discussed, and promising avenues for future research are indicated.
Resumen
Se revisan y se analizan los datos embriológicos de importancia para la familia Araceae, haciendo énfasis en la polarización de las facetas de los caracteres. Las facetas consideradas como primitivas dentro de la familia incluyen: existencia de engrosamientos endotécicos; polen binucleado y sin almidón; óvulos anátropos y crasinucelados con caliptra nucelar gruesa y un solo hacecillo funicular no ramificado; embriogénesis de tipo solanáceo o cariofiláceo; desarrollo helobial del endosperma, con 2–8 células en la cámara calazal y división celularab initio en la cámara micropilar; y endosperma presente en las semillas maduras. Se discute el significado filogenético de estas conclusiones, y se indican las lineas de investigación más prometedoras para el futuro.
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Grayum, M.H. Systematic embryology of the Araceae. Bot. Rev 57, 167–203 (1991). https://doi.org/10.1007/BF02858562
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DOI: https://doi.org/10.1007/BF02858562