Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Brèves → Brèves 2020 → Desert algae shed light on desiccation tolerance in green plants

Desert algae shed light on desiccation tolerance in green plants

ScienceDaily (July 6, 2020 )

Titre : Desert algae shed light on desiccation tolerance in green plants

ScienceDaily (July 6, 2020 )

Résumé
Deserts of the US Southwest are extreme habitats for most plants, but, remarkably, microscopic green algae live there that are extraordinarily tolerant of dehydration. After completely drying out, the algae can become active and start photosynthesizing again within seconds of receiving a drop of water. Botanists provide a genetic explanation for the algae’s resilience, a new perspective that warrants investigation in plants more generally.

Descriptif
Working with two particularly resilient species of green microalgae (Acutodesmus deserticola and Flechtneria rotunda), Peredo and Cardon studied up- and down-regulation of gene expression during desiccation, and added a twist. They also analyzed gene expression in a close aquatic relative (Enallax costatus) as it dried out and ultimately died. Surprisingly, all three algae — desiccation tolerant or not — upregulated the expression of groups of genes known to protect even seed plants during drought. But the desiccation-tolerant algae also ramped down expression of genes coding for many other basic cellular processes, seemingly putting the brakes on their metabolism. The aquatic relative did not.

Story Source  : Marine Biological Laboratory

Annonce (ScienceDaily)

Page publiée le 27 juin 2021