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Diversity of Archaea I

Diversity of Archaea I

Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...

Cell Diversity

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The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
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Diversity of Archaea II

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Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...

Diversity of Protists I

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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...

Diversity of Protists II

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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...

Introduction to Plant Diversity

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Related Experiment Video

Updated: Jan 29, 2026

Asymbiotic Germination and Leaf Explant-Based Regeneration of the Endangered Medicinal Orchid Hemipilia cucullata from Mature Seeds

Asymbiotic Germination and Leaf Explant-Based Regeneration of the Endangered Medicinal Orchid Hemipilia cucullata from Mature Seeds

Published on: September 19, 2025

Physiological diversity of orchids.

Shibao Zhang¹, Yingjie Yang^1,2, Jiawei Li^1,2

¹Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.

Plant Diversity

|February 12, 2019

Summary

This summary is machine-generated.

Orchids exhibit diverse adaptations for survival, including specialized leaf structures and water management. Mycorrhizal fungi are crucial for nutrient uptake and seed germination in many orchid species, impacting their growth and cultivation.

Keywords:

Abiotic environments Morphology Mycorrhiza Orchid Photosynthesis

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Last Updated: Jan 29, 2026

Asymbiotic Germination and Leaf Explant-Based Regeneration of the Endangered Medicinal Orchid Hemipilia cucullata from Mature Seeds

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Area of Science:

Botany
Plant Physiology
Ecology

Background:

The Orchidaceae family is diverse, with significant ornamental, medical, and evolutionary value.
Orchid species display varied physiological traits influenced by morphology, habitat, and life history.
Most orchids have slow growth, long juvenile periods, and low photosynthetic capacity due to CO2 diffusion limitations and leaf structure.

Purpose of the Study:

To explore the physiological properties and adaptations of orchids.
To understand the role of environmental factors like light, temperature, and water availability on orchid survival.
To investigate the critical dependence of orchids on mycorrhizal fungi for nutrient acquisition and reproduction.

Main Methods:

Comparative analysis of physiological and morphological traits across different orchid types (epiphytic, terrestrial).
Examination of adaptations for water management, including velamen radicum, succulence, and Crassulacean Acid Metabolism.
Review of the symbiotic relationship between orchids and mycorrhizal fungi in nutrient uptake and seed germination.

Main Results:

Epiphytic orchids possess adaptations for water conservation and nutrient absorption via velamen radicum and mycorrhizal associations.
Terrestrial orchids have specialized underground structures (rhizomes, corms, tubers) for survival.
Orchid survival is influenced by light, temperature extremes, and water availability, with adaptations for each.
Mycorrhizal fungi are essential for seed germination and nutrient supply, particularly for epiphytic orchids in nutrient-poor environments.

Conclusions:

Orchid diversity is linked to a wide range of physiological and morphological adaptations.
The symbiotic relationship with mycorrhizal fungi is fundamental to orchid life cycles, from germination to adult nutrition.
Further research is needed on factors influencing slow growth, flowering, and the application of mycorrhizal fungi in cultivation.