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Notes on the self-pollination in Dendrobium biflorum (Orchidales, Dendrobiinae)

100%

Kowalkowska A. K., Margonska H. B.

Acta Societatis Botanicorum Poloniae

2012

tom 81

nr 3

The conditions favouring self-pollination are determined for a species of Dendrobium Sw. A survey of gynostemium micromorphology in collected flowers of Dendrobium biflorum revealed two stages of a unique form of autogamy: on germination of pollen tetrads, pollen tubes reached the stigmatic region without the pollen being displaced from the anther locules. This is the first time for this type of autogamy to be reported in Dendrobium biflorum. Pollen grains germinated directly from the locules, bypassing the stigma or falling or sliding down onto the stigmatic surface. The pollen tubes were long and reached the stylar canal. On The Society Islands, differences in exposure of the habitats to weather conditions and altitude gradients influence both composition and form of the vegetation, as well as the occurrence of pollinators. The form of autogamy described here may be the usual method of pollination found on The Society Islands (and even the whole of French Polynesia), where suitable pollinators are absent and/or growth conditions stressful.

Notes on the genus Crepidium [Orchidaceae, Malaxidinae], with descriptions of new species from Northern Sumatra

100%

Szlachetko D. L., Margonska H. B.

Fragmenta Floristica et Geobotanica

1998

tom 43

nr 2

Ograniczanie wyników

1 Acta Societatis Botanicorum Poloniae

1 Fragmenta Floristica et Geobotanica

2 Margonska H. B.

1 Kowalkowska A. K.

1 Szlachetko D. L.

1 2012

1 1998

Wyniki wyszukiwania

Notes on the self-pollination in Dendrobium biflorum (Orchidales, Dendrobiinae)

Notes on the genus Crepidium [Orchidaceae, Malaxidinae], with descriptions of new species from Northern Sumatra