Resumo

FERRAROTTO, M. S.  e  DA SILVA, H.. Germination and morphology of canary grass (Phalaris canariensis L.) Poaceae, under different conditions of light quality. Polibotánica [online]. 2013, n.36, pp.95-104. ISSN 1405-2768.

The canary grass (Phalaris canariensis L.) is used as vegetal material and indicative plant in studies for virus detection and characterization, allelopathic effects, biological control and biochemistry of bioactive functional substances. Nevertheless, no previous reports upon germination response and morphological aspects of seedlings growing in vitro were found. The objectives of this study were to study morphological aspects of seedlings of canary grass and the germination response in vitro, under different light qualities, which would be useful in the interpretation of further results in plant research. Seeds were exposed to treatments in Petri dishes: T1, natural light; T2, red light; T3, red light-far red light; T4, red light-far red light-red light; T5, darkness; T6, transparent filter; T7, blue filter; T8, green filter and T9, red filter. Results show that seeds are photoblastic negative with 48% germination in the dark in 48h and 16% under red filter. The natural light and all the filters suppress the radicle growth, shorter ones were observed under the green filter (0.8 cm). Red light alone and its combination with far red, as well as darkness stimulated radicle elongation up to 7.8cm. Natural light suppressed coleoptile growth in the same magnitude than with green filter (0.8 and 0.7 cm respectively). Under red light and its combination with far red, seedlings were etiolated showing a coleoptile between 9.410.3 cm and the first leaf between 13.2-14 cm. Chlorophyll content was higher in light than in darkness (6.42 x 10^-3 y 3.49 x 10^-3 mg mL^-1, respectively).

Palavras-chave : canary grass; germination; light; morphology; Phalaris canariensis.

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