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Vegetative phase change in Populus tremula × alba.

Erica H Lawrence1, Aaron R Leichty1,2, Erin E Doody1

  • 1Department of Biology, University of Pennsylvania, Philadelphia, PA, 19104, USA.

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|March 4, 2021
PubMed
Summary

Vegetative phase change in poplars is subtle but regulated by miR156. This study clarifies natural progression, aiding research on this important genus.

Keywords:
Populus (poplar)developmentjuvenile-to-adult transitionmiR156vegetative phase change

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Area of Science:

  • Plant biology
  • Developmental genetics
  • Molecular plant science

Background:

  • Vegetative phase change (VPC) marks transitions from juvenile to adult plant stages.
  • Subtle phenotypic differences in poplars complicate VPC determination.
  • In vitro propagation limits understanding of natural VPC progression in poplars.

Purpose of the Study:

  • To investigate natural vegetative phase change (VPC) in Populus tremula × alba.
  • To compare developmental morphology between seed-grown and in vitro propagated poplars.
  • To elucidate the role of miR156 in regulating VPC in poplars.

Main Methods:

  • Examined developmental morphology of seed-grown and in vitro derived Populus tremula × alba (clone 717-1B4).
  • Compared phenotypes with transgenic poplars exhibiting altered miR156 expression.
  • Analyzed trait changes in relation to node number and developmental time.

Main Results:

  • Seed-grown poplars exhibited node-to-node trait changes within the first 3 months, stabilizing after node 25.
  • miR156 overexpression maintained juvenile traits, while reduced miR156 enhanced adult traits.
  • Leaf fluttering, a characteristic Populus trait, is regulated by the miR156/SPL pathway.
  • In vitro grown plants mirrored seed-grown plants' development, validating research models.

Conclusions:

  • The miR156/SPL pathway is a key regulator of natural vegetative phase change in poplars.
  • Developmental morphology in vitro accurately reflects natural progression, supporting its use in research.
  • Findings provide a basis for studying VPC's role in poplar ecology and evolution.