Mechanisms of canola imbibition kinetics and vigour dynamics under sub-optimal hydration: implications for dry sowing.

Canola seed vigour under sub-optimal hydration is linked to hydration-dependent metabolic states, with higher vigour observed at -20 MPa and declines near -5 MPa under high temperature.

• Why it matters: Understanding how seed hydration and environmental conditions affect vigour is crucial for optimizing early and dry sowing in Mediterranean climates, where germination timing is uncertain.
• What they did: Researchers measured water content, germination thresholds, and vigour responses across water potentials and temperatures, developing a process model of water imbibition and ageing effects.
• The result: Findings suggest seed vigour is influenced by hydration levels, with damage potentially greatest at intermediate water potentials, informing management strategies to reduce establishment risks during dry sowing.