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Polyembryony in maize: histological analysis

100%

Erdelska O.

nr 1-2

123-125

Successive tissue degeneration in unfertilized ovules of Daphne arbuscula

100%

Erdelska O.

tom 41

Successive degradation of tissues in a strict order was observed in unfertilized ovules of the endemitic species Daphne arbuscula (Čelak) before flower drop. Cell death begins in the nucellus and inner integument in the vicinity of the vascular bundle terminal, proceeds in the outer integument and ends in the ovary wall. This successivity corresponds with that of programmed recycling described for senescing leaves of deciduous trees. In the extreme conditions of the D. arbuscula habitus, flowering is abundant but fertilization of ovules is relatively rare and seed set is low, so recycling of nutrients from tissues of unfertilized ovules should be expected as part of the life strategy of this species.

XI Miedzynarodowa Konferencja Embriologii Roslin: Rozmnazanie roslin: od Mendla do biologii molekularnej [Brno, Republika Czeska, 1-3 wrzesnia 2003]

63%

Erdelska O. , Czapik R.

2003

tom 47

nr 3-4

70-73

Reproductive biology of Ruscus hypoglossum L. in Slovakia

63%

Halada L. , Erdelska O.

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.

Chlorophyll content and culture of flax embryos in vitro

51%

Petrova A. , Ciamporova M. , Erdelska O.

tom 50

nr 1-2

Slowacko-polska wspolpraca w botanice - retrospektywne spojrzenie na przelomie wiekow

32%

Zahradnikova K. , Erdelska O. , Bacigalova K. , Hindak F. , Hrabovec I. , Paulech P. , Pisut I. , Siposova H.

Wiadomości Botaniczne

2000

tom 44

nr 1-2

7-22