Influence of Environmental Factors on Seed Germination and Emergence of Asia Minor Bluegrass (Polypogon fugax)

文献类型： 外文期刊

第一作者： Wu, Lamei

作者： Wu, Lamei;Zhou, Xiaomao;Bai, Lianyang;Wang, Lifeng;Wu, Lamei;Zhou, Xiaomao;Bai, Lianyang;Jin, Su;Liu, Xiangying

作者机构：

关键词： Burial depth;light;osmotic stress;pH;salt stress;temperature

期刊名称：WEED TECHNOLOGY （ 影响因子：1.884； 五年影响因子：1.917 ）

ISSN：

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收录情况： SCI

摘要： Asia minor bluegrass (AmB) is a major weed impacting rapeseed production in Dongting Lake District, China. Growth chamber experiments were conducted to determine the influence of environmental factors on germination and emergence of AmB. The optimum constant temperature for germination was around 20 C. Seeds showed germination percentages above 60% under 22/15 and 24/19 C day/night temperature regimes. Seeds could germinate in the dark, but light exposure significantly enhanced the germination percentage. More than 50% of seeds germinated over a pH range between 4 and 10. Seeds were highly sensitive to osmotic stress, and germination was completely inhibited at an osmotic potential of -0.4 MPa, indicating that it was favored by a moist environment. Increasing salinity reduced germination of AmB seeds from 58% at 0 mM to 13% at 80 mM NaCl. The highest seedling emergence (62%) was observed when seeds were placed on the soil surface, and no seedlings emerged from seeds placed at a depth of 5 cm. This work shows that the climate and soil conditions in Dongting Lake District are suitable for AmB seed germination and that no-till fields, where seeds remain on the soil surface, promote the successful establishment of the weed.

分类号： S4

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