Dormancy breaking, germination, and seedling emergence from seeds of Crataegus submollis

• Autorzy: Bujarska-Borkowska B
• Języki publikacji: EN

Abstrakty

EN

Effects of several stratification variants on seed dormancy breaking were compared in Crataegus submollis Sarg. (hairy cockspur-thorn or Quebec hawthorn). Ripe seeds were collected (in October), cleaned, and dried to a moisture content of 7–12%. Seed dormancy in this species was broken most effectively by warm-cold stratification of nutlets, in a substrate or without any substrate, at 15~25°/3°C or 20~30°/3°C, i.e. with a cyclically alternating warm stage (16+8 hrs or 24+24 hrs/cycle) lasting 16–20 weeks, followed the cold stage lasting ca. 20 weeks, i.e. till the appearance of the first germinating seeds. After stratification, emergence rate is equally high (ca 50%) at cyclically alternating temperatures of 3~15°C and 3~20°C (16+8 hrs). Chemical scarification of nutlets in 96% sulphuric acid for 3 hrs, followed by warm-cold stratification at 20~30°/3°C, with a short, 4-week warm stage, also ensures a high emergence rate (58%). Seed desiccation (in nutlets) slowly to a moisture content of 10–12%, after stratification in a substrate or without any substrate as well as after scarification, results in a reduced emergence rate, especially if seeds are dried to the lower moisture content. Seed storage (in nutlets after drying to a moisture content of 10%) for 10 years at –3°C, does not decrease the emergence rate (93%) after stratification at 20~30°/3°C in a substrate, with a cyclically alternating warm stage (24+24 h) lasting 16 weeks.

Słowa kluczowe

EN

hawthorn; Crataegus submollis; seed; seedling emergence; germination; dormancy breaking; stratification; scarification; desiccation; storage

• Wydawca: -
• Czasopismo: Dendrobiology
• Rocznik: 2007
• Tom: 58
• Opis fizyczny: p.9-15,fig.,ref.

Twórcy

autor

Bujarska-Borkowska B

• Polish Academy of Sciences, Institute of Dendrology, Parkowa 5, 62-035 Kornik, Poland

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