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Water and Mineral Acquisition02:34

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Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
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Plant cells maintain appropriate osmotic balance in extreme conditions. For instance, plants in dry environments store water in vacuoles, limit the opening of their stoma, and have thick, waxy cuticles to prevent unnecessary water loss. Some species of plants that live in salty environments store salt in their roots. As a result, water osmosis occurs in the root from the surrounding soil.
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Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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Related Experiment Video

Updated: Aug 5, 2025

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What can hornworts teach us?

Eftychios Frangedakis1, Alan O Marron1, Manuel Waller2,3

  • 1Department of Plant Sciences, University of Cambridge, Cambridge, United Kingdom.

Frontiers in Plant Science
|March 27, 2023
PubMed
Summary

The hornwort Anthoceros agrestis is a new model system for plant biology research. This model aids in understanding plant evolution and has potential applications in crop improvement and synthetic biology.

Keywords:
RNA editingevo-devoland plantsplant-cyanobacteria symbiosisplant-mycorrhizal symbiosispolyplastidypyrenoidterrestrialization of plants

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Area of Science:

  • Plant Biology
  • Evolutionary Biology
  • Developmental Biology

Background:

  • Hornworts (Bryophytes) represent a sister group to all other land plants (Tracheophytes).
  • Their unique phylogenetic position makes them crucial for understanding early land plant evolution.
  • Traditionally, hornworts have been difficult to study experimentally.

Purpose of the Study:

  • To highlight the recent development of Anthoceros agrestis as a tractable experimental system.
  • To compare A. agrestis with existing plant model systems.
  • To discuss the potential of A. agrestis in addressing key questions in plant biology and its applications.

Main Methods:

  • Establishment of Anthoceros agrestis as a model organism.
  • Comparative analysis with other plant model systems.
  • Exploration of research avenues in developmental biology and evolutionary studies.

Main Results:

  • Anthoceros agrestis is now amenable to experimental investigation.
  • This model system offers new opportunities for comparative developmental studies.
  • Potential applications in crop improvement and synthetic biology are identified.

Conclusions:

  • Anthoceros agrestis is a valuable new model system for plant science.
  • It can help resolve fundamental questions about plant terrestrialization.
  • Its utility extends to practical applications in agriculture and biotechnology.