Circadian clock components control growth and gibberellin metabolism in Populus trees

• This study investigates the role of the circadian clock in the regulation of gibberellin (GA) metabolism and growth in hybrid aspen (Populus tremula x P. tremuloides (Ptt)). We revealed a conserved function of the clock homolog PttEARLY BIRD1 (PttEBI1), but also implicated its rolein controlling tree growth. GA metabolite profiling and transcriptomic analysis in hybrid aspenlines with modulated expression of PttEBI1 or the core clock homologs PttLATE ELONGATED HYPOCOTYLs (PttLHYs) revealed significant changes in GA metabolism. These alterations werelinked to the differential expression of PttGA2ox8, a gene encoding an enzyme with both GA2-oxidase and GA20-oxidase activities. Our results indicate that modifications to circadian clockcomponents can significantly influence both GA metabolism and tree growth, providing potential strategies for improving tree biomass production.

Ämnesord

NATURVETENSKAP  -- Biologi -- Botanik (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Botany (hsv//eng)

Nyckelord

circadian clock

growth

trees

hybrid aspen

populus tremula x tremuloides

gibberellin

Publikations- och innehållstyp

vet (ämneskategori)

ovr (ämneskategori)