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Reproductive biology of Ruscus hypoglossum L. in Slovakia

100%

Halada L., Erdelska O.

Acta Biologica Cracoviensia. Series Botanica

2005

tom 47

nr 1

Ruscus hypoglossum L. (Asparagaceae), a rare and endangered species of the Malé Karpaty Mts. in Slovakia, is an evergreen geophyte having rigid leaves with special bracts developed on them. The flowers are unisexual, and the plant is dioecious. Well-developed stamens and rudimentary pistils in different stages of development occur in male flowers. Remnants of degenerated anthers persist in female flowers, which have two ovules in the ovary. Male plants prevail in local populations; the average ratio of male to female plants is 5:1. Reproduction in Ruscus hypoglossum is generative and vegetative. Fruit (red berry) development lasts from May to October. The seeds are round, 6-8 mm in diameter, and albuminous. The endosperm is helobial, with a haustorial chalazal chamber. The endosperm cell walls in mature seeds are thickened and are composed of reserve cellulose. The mature embryo consists of one elongated cotyledon, a plumule, short hypocotyl and radicle. Seed dormancy lasts one year. Vegetative propagation is accomplished by rhizome fragmentation. The populations should be protected above all against direct destruction, shoot collecting, and grazing by animals, especially deer.

Morphological variability of seeds and fruits of Ruscus hypoglossum in Croatia

84%

Kremer D., Karlovic K., Grubesic R. J.

Acta Biologica Cracoviensia. Series Botanica

2009

tom 51

nr 1

91-96

The paper reports a morphological study of fruits and seeds of Ruscus hypoglossum L., a species interesting as an ornamental plant. Initially, the length, width and weight of fruits as well as seeds were measured in 14 natural populations growing in Croatia. The length/width ratios of fruits and seeds were calculated, as well as the fruit/seed ratios of length, width and weight. Interannual differences in the analyzed traits over three years were compared in two populations. The most promising populations for further selection for ornamental use were the Bilogora population with the largest fruits (length 12.30 mm, width 11.56 mm, weight 0.75 g) and the Strahinščica population with the roundest fruits (length/width 1.04). The average number of seeds per fruit for the populations was 1.40. Variability between the three years was minor for fruit traits but significant for seed traits.

Ograniczanie wyników

2 Acta Biologica Cracoviensia. Series Botanica

1 Erdelska O.

1 Grubesic R. J.

1 Halada L.

1 Karlovic K.

1 Kremer D.

1 2009

1 2005

Wyniki wyszukiwania

Reproductive biology of Ruscus hypoglossum L. in Slovakia

Morphological variability of seeds and fruits of Ruscus hypoglossum in Croatia