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首页> 美国卫生研究院文献>Annals of Botany >Effects of Neotyphodium Fungi on Lolium multiflorum Seed Germination in Relation to Water Availability
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Effects of Neotyphodium Fungi on Lolium multiflorum Seed Germination in Relation to Water Availability

机译：新伤寒真菌对多花黑麦草种子萌发的影响及其与水分利用的关系

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• Background and Aims Temperate endophyte-infected (Neotyphodium sp.) grasses have been shown to exhibit an ecological advantage over endophyte-uninfected grasses under abiotic stressful conditions. It is predicted that endophyte-infected plant populations will display higher rates of germination and proportion of germinated seeds under limiting water conditions.• Methods The hydrotime regression model was used to describe the effect of Neotyphodium endophyte on seed germination of Lolium multiflorum at different water potentials. Additionally, seed mortality after water stress exposure was estimated in endophyte-infected and -uninfected seeds.• Key Results Endophyte infection inhibited seed germination at all water potentials. The hydrotime model described satisfactorily the germination responses, and revealed that endophyte-free seeds exhibited higher rates of and final percentage germination, probably due to a lower base water potential compared with endophyte-infected seeds. However, Neotyphodium endophyte conferred a higher rate of survival in those seeds that remained ungerminated when exposed to highly water stress conditions.• Conclusions Changes produced by Neotyphodium endophyte in L. multiflorum seeds might affect fitness in particular ecological scenarios. For example, the presence of the endophyte may curtail seed germination when water is limiting, reducing the risk of seedling death. Conversely, endophyte-free seeds would display an enhanced germination, ensuring a more rapid seedling establishment if later water conditions do not restrict plant growth.
机译：•背景和目的在非生物胁迫条件下，温带内生细菌感染的草（Neotyphodium sp。）已显示出比未内生真菌感染的草具有生态优势。预测在有限的水分条件下，被内生植物感染的植物种群将表现出更高的发芽率和发芽种子比例。•方法使用水时回归模型描述内生真菌对不同水势下内生黑麦草对多花黑麦草种子萌发的影响。 。此外，估计了受内生植物感染和未感染的种子在水分胁迫下的种子死亡率。•主要结果内生细菌感染在所有水势下均抑制了种子发芽。水文时间模型令人满意地描述了发芽反应，并揭示了无内生菌种子表现出较高的发芽率和最终发芽百分比，这可能是由于与受内生植物感染的种子相比，基础水势较低。然而，内生真菌在暴露于高水分胁迫条件下仍未发芽的种子中具有更高的存活率。•结论内生真菌在何首乌种子中产生的变化可能会影响特定生态环境下的适应性。例如，当水有限时，内生菌的存在可以减少种子发芽，从而降低幼苗死亡的风险。相反，无内生种子将显示出更高的发芽率，如果以后的水分条件不限制植物生长，则可确保更快地建立幼苗。

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