Directional Auxin Transport Mechanisms in Early Diverging Land Plants

Sammanfattning

The emergence and radiation of multicellular land plants was driven by crucial innovations to their body plans [1]. The directional transport of the phytohormone auxin represents a key, plant-specific mechanism for polarization and patterning in complex seed plants [2-5]. Here, we show that already in the early diverging land plant lineage, as exemplified by the moss Physcomitrella patens, auxin transport by PIN transporters is operational and diversified into ER-localized and plasma membrane-localized PIN proteins. Gain-of-function and loss-of-function analyses revealed that PIN-dependent intercellular auxin transport in Physcomitrella mediates crucial developmental transitions in tip-growing filaments and waves of polarization and differentiation in leaf-like structures. Plasma membrane PIN proteins localize in a polar manner to the tips of moss filaments, revealing an unexpected relation between polarization mechanisms in moss tip-growing cells and multicellular tissues of seed plants. Our results trace the origins of polarization and auxin-mediated patterning mechanisms and highlight the crucial role of polarized auxin transport during the evolution of multicellular land plants.

Publicerad i

Current Biology
2014, volym: 24, nummer: 23, sidor: 2786-2791
Utgivare: CELL PRESS

SLU författare

• Viaene, Tom

• Landberg, Katarina

  • Institutionen för växtbiologi, Sveriges lantbruksuniversitet
    

• Thelander, Mattias

  • Institutionen för växtbiologi, Sveriges lantbruksuniversitet
    

• Pederson, Eric

  • Institutionen för växtbiologi, Sveriges lantbruksuniversitet
    

• Sundberg, Eva

  • Institutionen för växtbiologi, Sveriges lantbruksuniversitet
    

• Ljung, Karin

  • Institutionen för skoglig genetik och växtfysiologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Evolutionsbiologi
Utvecklingsbiologi

Publikationens identifierare

• DOI: https://doi.org/10.1016/j.cub.2014.09.056

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/66841