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Close-up of a closed aspen bud in front of a black background

Trees do not just count cold – they use warm spells to track winter’s progress

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Last Updated: 13 April 2026
Close-up of a closed aspen bud in front of a black backgroundShort warm spells in early winter help trees fine-tune when it is safe to open their buds. Photo: Aswin Nair

To survive winter, trees must time spring growth with great precision. New research from Umeå Plant Science Centre shows that trees also use warm interruptions in early winter as signals, helping buds avoid opening too early.

Read more: Trees do not just count cold – they use warm spells to track winter’s progress

A woman with long brown hair wearing a white shirt is holding a book with a brown-red cover in her hand. She stands in front of a red wall.

New genes behind chemical defence in aspen identified

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Last Updated: 13 April 2026
A woman with long brown hair wearing a white shirt is holding a book with a brown-red cover in her hand. She stands in front of a red wall.Sara Rydman recently defended her PhD research on the genetic basis of chemical defence in aspen (photo: Anne Honsel).

Trees constantly have to balance growth with defence against attack. In her PhD research at Umeå University, Sara Rydman has identified several new genes linked to the formation of chemical defence compounds in aspen. The findings provide new insight into the genetic basis of chemical defence in trees.

Read more: New genes behind chemical defence in aspen identified

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