Morfologia de plantulas e est芍dios juvenis de esp谷cies invasoras = Morphology and development of seedlings and saplings of weeds

作者：Kathia Socorro Mathias Mouro; Laercio Domingues; Juliana Marzinek

来源：Acta Scientiarum - Biological Sciences, 2007.

• morfologia
• plantula
• planta invasora
• planta jovem
• morphology
• seedling
• weed
• sapling

Plantulas e plantas jovens de vinte esp谷cies de plantas invasoras, que ocorrem nas culturas mais freq邦entes de Maring芍, Estado do Paran芍, Brasil e regi es adjacentes, foram descritas morfologicamente, e contribuem para identifica o no campo e fornecem informa es para trabalhos taxon micos e ecol車gicos. Em 16 esp谷cies, a plantula 谷 ep赤geo-foli芍cea. Em Cardiospermum halicacabum, 谷 ep赤geo-carnosa; em Cenchrus echinatus e Digitaria horizontalis, 谷 hip車gea; e, em Commelina virginica, 谷 criptocotiledonar-ep赤gea (tipo ※Durio§). A diferencia o do primeiro eofilo variou de dez (Digitaria horizontalis) a 35 dias (Bidens pilosa) e do primeiro metafilo de 22 (Commelina virginica) a 49 dias (Acanthospermum australe). O n迆mero de eofilos formados variou de um a quatro e a filotaxia, de alterna a oposta. The morphology of 20 species of weeds that occur in the most common crops in Maring芍, Paran芍 State, Brazil and adjacent regions were described at early developmental stages, in order to identify the species in the field and provide information for taxonomic and ecological works. Sixteen species featured epigeal-foliaceous seedlings. The seedling in Cardiospermum halicacabum isepigeal-fleshy; in Cenchrus echinatus and Digitaria horizontalis it is hypogeal and in Commelina virginica is epigeal-cryptocotyledonar. The differentiation of the first eophyll occurred within ten(Digitaria horizontalis) to 35 days (Bidens pilosa) and the first metaphyll appeared within 22 (Commelina virginica) to 49 days (Acanthospermum australe). The number of eophylls varied from one to four, and the phyllotaxis varied from alternate to opposite.