Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: buried seed

Sortuj według:

Ogranicz wyniki do:

Effect of environmental conditions on germination and persistence of Taraxacum officinale WEB. ex WIGGERS seeds in a soil bank

100%

Bochenek A., Gielwanowska I., Zuk-Golaszewska K.

Zeszyty Problemowe Postępów Nauk Rolniczych

2008

tom 524

The aim of this study was to explain how temperature, desiccation, light and nitrate affect the seasonal pattern of germination and persistence of dandelion achenes. Directly after collection, Taraxacum officinale Web. ex Wiggers achenes were characterized by non-deep primary dormancy, while dry stored at a low temperature, they showed slight seasonal variations of dormancy level. Both high and low soil temperatures caused dormancy release in dandelion seeds. Dandelion achenes did not form a persistent soil bank. The decline of viable seeds was probably due to long-term sub-zero soil temperatures accompanied by its considerable hydration. Nitrate may be a component of the system of environmental signals which, along with light and desiccation, would enable dandelion seeds to detect even the smallest gaps in dense vegetation. As the dormancy changes are fast, the detection of these gaps by Taraxacum officinale achenes may be especially effective. Such ability of dandelion seeds may explain the remarkable ease with which this species occupies grassland areas densely covered with vegetation.

Ograniczanie wyników

1 Zeszyty Problemowe Postępów Nauk Rolniczych

1 Bochenek A.

1 Gielwanowska I.

1 Zuk-Golaszewska K.

1 2008

Wyniki wyszukiwania

Effect of environmental conditions on germination and persistence of Taraxacum officinale WEB. ex WIGGERS seeds in a soil bank