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INHIBITIONS OF GERMINATION AND RADICULAR GROWTH OF LETTUCE (CV. GRAND RAPIDS) BY AQUEOUS EXTRACTS OF FIVE SPECIES OF Gleicheniaceae

ABSTRACT

The allelopatic activity in five species of Gleicheniaceae (Dicranopteris flexuosa (Schrader) Underw., Gleicheniella pectinata (Willd.) Ching, Sticherus bifidus (Willd.) Ching, Sticherus penniger (Mart.) Copel., Sticherus nigropaleaceus (Sturm.) J. Prado & Lellinger) was studied through the action of aqueous extracts of green and senescent fronds on the germination and the development of lettuce roots (Lactuca sativa L. - cv. grand rapids). Significant differences between the control (distillate water) and aqueous extracts were detected. Specific effects were detected by the test of multiple comparisons of Tukey (HSD). It was observed a significant reduction of germination and root growth in the majority of the treatments. Generally, the aqueous extracts of green fronds showed more activity.

Key wors:
Pteridophyta; Gleicheniaceae; allelopathy.

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