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2006 | 509 |

Tytuł artykułu

Effect of temperature, desiccation, nitrate and light on the seasonal dormancy pattern expression of Cirsium arvense (L.) Scop. achenes

Treść / Zawartość

Warianty tytułu

PL
Wpływ temperatury, desykacji, azotanów oraz światła na ekspresję sezonowego wzorca spoczynku niełupek Cirsium arvense (L.) Scop.

Języki publikacji

EN

Abstrakty

EN
The objective of the present study was to determine the effects of soil temperature, desiccation, light conditions and concentration of nitrates on the seasonal germination pattern of Cirsium arvense achenes. Seed lots collected in summer were buried in field in autumn. Once a month all over a year, one portion of them was exhumed to test germination in light or darkness, with or without nitrate and with or without desiccation. Seeds germination also was tested after long preincubation at various constant temperatures (2, 6, 12 and 19°C) and at temperatures rising stepwise from 2 to 26°C. Creeping thistle seeds did not show of apparent endogenous seasonal dormancy pattern. Environmental conditions in soil bank resulted in the appearance of seasonal changes in seed germination. The changes in dormancy were mainly regulated by the field temperature. The dormancy of imbibed seeds was relieved by rising temperatures, when the temperature had reached 12°C. The temperature increase above 12°C resulted in dormancy induction. The dormancy breaking of imbibed seeds stored for 2 months at 19°C was complete, but during longer storage dormancy development occurred. The seed dormancy relief at lower temperatures was slower and incomplete. Nitrate, desiccation and light affected seed germination to a lesser extent, and their effects were season-related.
PL
Określono wpływ temperatury glebowej, desykacji, światła i azotanów na sezonowy wzorzec kiełkowania niełupek Cirsium arvense. Zbierane latem próbki nasion zakopywano w warunkach polowych jesienią. Raz w miesiącu w ciągu całego roku, wykopywano część nasion i poddawano testowi kiełkowania na świetle lub w ciemności, w obecności lub bez azotanów, po desykacji lub bez niej. Kiełkowanie nasion badano także po wcześniejszej długotrwałej inkubacji w różnych stałych temperaturach (2, 6, 12 i 19°C) i w temperaturach wzrastających stopniowo od 2 do 26°C. Nasiona ostrożenia polnego nie wykazywały wyraźnego endogennego sezonowego wzorca spoczynku. Dopiero czynniki środowiska glebowego spowodowały ujawnienie się sezonowych zmian w kiełkowaniu nasion. Zmiany spoczynku były regulowane głównie przez temperaturę glebową w polu. Spoczynek nasion ustępował pod wpływem temperatur rosnących do 12°C. Temperatury przekraczające 12°C powodowały indukcję spoczynku. Skutkiem przechowywania napęczniałych nasion przez 2 miesiące w 19°C było całkowite przełamanie spoczynku, ale w dłuższym okresie spoczynek rozwijał się ponownie. Uwalnianie spoczynku w niższych temperaturach zachodziło wolniej i było niecałkowite. Azotany, desykacja i światło wpływały na kiełkowanie nasion w mniejszym stopniu a efekt ich działania zależał od pory roku.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

509

Opis fizyczny

p.61-74,fig.,ref.

Twórcy

autor
  • Department of Plant Physiology and Biotechnology, Faculty of Biology, University of Warmia and Mazury, M.Oczapowskiego 1a, 10-718 Olsztyn, Poland
  • Department of Plant Physiology and Biotechnology, Faculty of Biology, University of Warmia and Mazury, Olsztyn, Poland

Bibliografia

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Typ dokumentu

Bibliografia

Identyfikatory

Identyfikator YADDA

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