Long-Term Seed Dormancy in Poa Pratensis L. Northern Norway

• Main Authors: Aamlid, Trygve S, Arntzen, Dagfinn
• Format: Text
• Language: unknown
• Published: UKnowledge 2024
• Subjects: germination; light; phytochrome; Poa pratensis; chilling; seed dormancy; seed weight; temperature; Agricultural Science; Agronomy and Crop Sciences; Plant Biology; Plant Pathology; Plant Sciences; Soil Science; Weed Science; Norway; Northern Norway
• Online Access: https://uknowledge.uky.edu/igc/1993/session51/5; https://uknowledge.uky.edu/context/igc/article/8334/viewcontent/93_05_S51.pdf

Inadequate gennination has often been obseived when planting Poa pratensis L. cv. Lavang (69°N) in northern Norwegian grasslands. This investigation was intended to elucidate whether this was due lo long­term seed dormancy, Seed-lots grown in different years in northern and southern Norway and stored at O-to•c, were germinated in Jakobsen­type germinators al various combinations of temperature and light. Significant dormancy was expressed at 21 °C even after 10 years of storage. Al this constant temperature, germination was promoted by 8 h fluorescent light compared with darkness and continuous light. Al 21/ I 2°C alternating temperature, seed genninated well irrespective of light condition. No consistent relationship was found between seed donnancy and place of production, temperature during seed maturation or seed weight. Pre-chilling of imbibed seed for 32 days at O.S°C or O.S/3.O°C decreased subsequent gennination at 12/6 and 18/12°C, but not at 21/ 12°C. II is concluded that long-term donnancy in Lavang may contribute to poor field germination, especially when diurnal fluctuations in temperature and light are small.