Frost tolerance and hardening capacity during the germination and early developmental stages of four white spruce (Picea glauca) provenances
Frost tolerance and hardening capacity during the germination and early developmental stages of four white spruce (Picea glauca) provenances
复制标题
四种白云杉种源发芽和早期发育阶段的耐冻性和硬化能力
作者：
C. Coursolle;F. Bigras;H. Margolis
研究了四种白云杉（Picea glauca (Moench) Voss）种源（北纬45°37'至50°17'之间）在四个不同发育阶段（吸水种子、胚根、子叶和幼苗）萌发阶段的耐霜性，并测定了后三个阶段的硬化能力。通过将胚根期萌芽体进行两次温度-光周期处理（20:15℃ - 16 小时光周期或 5:5℃ - 8 小时）14 天，并将子叶和幼苗期萌芽体进行四次处理（20:15℃ - 16 小时；20:15℃ - 8 小时；5:5℃ - 16 小时；5:5℃ - 16 小时）来检查硬化能力。 5:5°C - 8 小时）。这些处理后立即测定耐霜性。原产地纬度在任何发育阶段的抗冻性或硬化能力方面都没有显示出明显的模式。吸水的种子具有最大程度的抗冻性。除了最北的种源外，胚根期萌芽体对 5:5°C 的昼夜温度没有反应......
Frost tolerance during the germination stages of four white spruce (Picea glauca (Moench) Voss) provenances (between 45°37' and 50°17'N) was studied at four different developmental stages (imbibed seed, radicle, cotyledon, and young seedling), and their hardening capacity was determined for the latter three stages. Hardening capacity was examined by submitting radicle-stage germinants to two temperature-photoperiod treatments (20:15°C - 16-h photoperiod or 5:5°C - 8 h) for 14 days and by submitting cotyledon and young seedling stage germinants to four treatments (20:15°C - 16 h; 20:15°C - 8 h; 5:5°C - 16 h; 5:5°C - 8 h). Frost tolerance was determined immediately after these treatments. Latitude of origin showed no clear pattern with respect to either frost tolerance or hardening capacity at any of the developmental stages. Imbibed seeds had the greatest degree of frost tolerance. With the exception of the most northern provenance, radicle-stage germinants did not respond to a 5:5°C day:night temperature ...