Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Bacterial Phylum Tenericutes01:24

Bacterial Phylum Tenericutes

680
The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
680
Fungal Group Zygomycota01:29

Fungal Group Zygomycota

2.1K
Zygomycota, previously classified as a distinct fungal group, are primarily terrestrial, saprophytic molds that play a crucial role as decomposers. Recent phylogenetic studies have revealed that these fungi are now divided into two major clades — Mucoromycota, which includes many symbiotic species, and Zoopagomycota, which primarily consists of parasitic and pathogenic fungi. These groups exhibit distinct ecological roles and reproductive strategies while sharing key structural and...
2.1K
Diversity of Protists II01:27

Diversity of Protists II

2.3K
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...
2.3K
Diversity of Protists IV01:27

Diversity of Protists IV

2.1K
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
2.1K
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

1.6K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
1.6K
Diversity of Protists III01:27

Diversity of Protists III

2.1K
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,...
2.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

In-vitro auxin binding to particulate cell fractions from corn coleoptiles.

Planta·2014
Same author

Ethylene is involved in the autochemotropism of Phycomyces.

Planta·2014
Same author

The sporangiophore of Phycomyces blakesleeanus: a tool to investigate fungal gravireception and graviresponses.

Plant biology (Stuttgart, Germany)·2013
Same author

Gravitropism in Phycomyces: violation of the so-called resultant law - evidence for two response components.

Plant biology (Stuttgart, Germany)·2013
Same author

The role of retinol in the initiation of sporangiophores of Phycomyces blakesleeanus.

Planta·2013
Same author

Kinetics of photoaccumulation of β-carotene in Phycomyces blakesleeanus.

Planta·2013
Same journal

Identification of CAMTA transcription factors and functional analysis of OsCAMTA4 in rice blast and salt stress.

Planta·2026
Same journal

Genetic identification and candidate gene analysis for loci of spike density in wheat.

Planta·2026
Same journal

Regulatory roles of R2R3-MYB genes in plant growth, development and stress adaptation: insights into seed dormancy and germination.

Planta·2026
Same journal

Assembly and comparative analysis of the complete mitochondrial genome of Viola philippica (Malpighiales, Violaceae).

Planta·2026
Same journal

Somatic embryogenesis-induced epigenetic changes promoting catechin accumulation in Vaccinium vitis-idaea L.

Planta·2026
Same journal

Integrative transcriptome and long non-coding RNA analysis to decipher the molecular basis of cleistogamy in pigeonpea (Cajanus cajan (L) Millsp).

Planta·2026
See all related articles

Related Experiment Video

Updated: May 5, 2026

Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus
05:34

Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus

Published on: June 6, 2025

702

Tropic reversal in Phycomyces.

P Galland1, V E Russo

  • 1Abteilung Trautner, Max-Planck-Institut für Molekulare Genetik, Ihnestrasse 63-73, D-1000, Berlin-West 33, Germany.

Planta
|November 20, 2013
PubMed
Summary
This summary is machine-generated.

Phototropic reversal in Phycomyces sporangiophores occurs when light is removed during steady-state phototropism. This response, lasting 25-30 minutes, happens at the end of the sensory pathway.

More Related Videos

A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response
12:18

A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response

Published on: April 17, 2016

8.9K
A Simplified Method for Agrobacterium-mediated Transformation of Phytophthora palmivora
06:38

A Simplified Method for Agrobacterium-mediated Transformation of Phytophthora palmivora

Published on: March 20, 2026

952

Related Experiment Videos

Last Updated: May 5, 2026

Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus
05:34

Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus

Published on: June 6, 2025

702
A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response
12:18

A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response

Published on: April 17, 2016

8.9K
A Simplified Method for Agrobacterium-mediated Transformation of Phytophthora palmivora
06:38

A Simplified Method for Agrobacterium-mediated Transformation of Phytophthora palmivora

Published on: March 20, 2026

952

Area of Science:

  • * Plant biology
  • * Phototropism
  • * Sensory transduction

Background:

  • * Phycomyces sporangiophores exhibit phototropism, a growth response to light.
  • * Understanding the mechanisms of tropic reversal is crucial for plant sensory biology.

Purpose of the Study:

  • * To investigate the conditions and mechanisms underlying phototropic reversal in Phycomyces.
  • * To determine the point in the sensory transduction pathway where tropic reversal is initiated.

Main Methods:

  • * Induction of steady-state phototropism in Phycomyces sporangiophores.
  • * Sudden changes in light conditions (transition to darkness) were applied.
  • * Control experiments included assessing gravitropic responses and removal of barriers during avoidance responses.

Main Results:

  • * A change to darkness during steady-state phototropism reliably elicited a phototropic reversal.
  • * The observed reversal persisted for 25-30 minutes under dark conditions.
  • * Control experiments ruled out gravitropism as the cause and indicated reversal occurs downstream of sensory input.

Conclusions:

  • * Phototropic reversal in Phycomyces is triggered by changes in light stimuli during active phototropism.
  • * The reversal mechanism is localized to the output of the sensory transduction chain, not initial light perception.
  • * This finding provides insight into the regulation of plant growth responses to environmental cues.