Rhizoid formation in<i>Valonia</i>(Siphonocladales, Chlorophyceae)

Elvira, Paul Rommel; Sekida, Satoko; Okuda, K

doi:10.2216/11-31.1

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…Elvira et al . () have reported that dense networks of AFs develop in the protoplasm and aggregate locally during lenticular cell formation in Valonia . During SCD in the two Struvea species, the length of the protoplasmic portions that were almost disconnected from each other was shorter than that still linked by tubular constrictions (cf.…”

Section: Discussionmentioning

confidence: 99%

“…The fact that mycalolide B inhibited the final cut of the annular SCD protoplasm constrictions suggests that this is the possible function of reticulate AFs. Elvira et al (2012) have reported that dense networks of AFs develop in the protoplasm and aggregate locally during lenticular cell formation in Valonia. During SCD in the two Struvea species, the length of the protoplasmic portions that were almost disconnected from each other was shorter than that still linked by tubular constrictions (cf.…”

Section: Discussionmentioning

confidence: 99%

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Segregative cell division and the cytoskeleton in two species of the genus Struvea (Cladophorales, Ulvophyceae, Chlorophyta)

Okuda

Sekida

Hasebe

et al. 2016

Phycological Research

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SUMMARY The detailed segregative cell division (SCD) processes and changes in the arrangement of cortical microtubules and actin filaments were examined in two species of Struvea. SCD was initiated by the appearance of annular constrictions along the lateral side of a mother cell. The constrictions decreased in diameter, became thin, tubular in shape, and pinched the protoplasm of the mother cell into several protoplasmic sections. The protoplasmic sections expanded and developed into daughter cells, which appressed each other, and were arranged in a single row. Lateral branches protruded from the upper parts of the daughter cells. The protoplasm of the lateral branches was divided by secondary SCDs and was distributed amongst the new daughter cells. SCD and lateral branch formation were essential for morphogenesis in Struvea. Cortical microtubules were arranged parallel and longitudinally to the cell axis before SCD. When SCD was initiated, there was considerable undulation of the cortical microtubules and several transverse bundles appeared in the cytoplasmic zone where annular constrictions occurred. A microtubule‐disrupting drug (amiprophos methyl) inhibited SCD. Actin filaments maintained reticulate patterns before and during SCD. These results demonstrated that SCD in Struvea species was quite distinct from that in Dictyosphaeria cavernosa reported previously.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Segregative cell division and the cytoskeleton in two species of the genus Struvea (Cladophorales, Ulvophyceae, Chlorophyta)

Okuda

Sekida

Hasebe

et al. 2016

Phycological Research

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Inducible growth mode switches influence Valonia rhizoid differentiation

2012

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Cell differentiation and cell type commitment are an integral part of plant growth and development. Investigations on how environmental conditions affect the formation of shoots, roots, and rhizoids can help illustrate how plants determine cell fate and overall morphology. In this study, we evaluated the role of substratum and light on rhizoid differentiation in the coenocytic green alga, Valonia aegagropila. Elongating rhizoids displayed varying growth modes and cell shape upon exposure to different substrata and light conditions. It was found that soft substrata and dark incubation promoted rhizoid elongation via tip growth while subsequent exposure to light prevented tip growth and instead induced swelling in the apical region of rhizoids. Swelling was accompanied by the accumulation of protoplasm in the rhizoid tip through expansion of the cell wall and uninhibited cytoplasmic streaming. Subsequent diffuse growth led to the transformation from slender, rod-shaped rhizoids into spherical thallus-like structures that required photosynthesis. Further manipulation of light regimes caused vacillating cell growth redirections. An elongating V. aegagropila rhizoid cell thus appears capable of growth mode switching that is regulated by immediate environmental conditions thereby influencing ultimate cell shape and function. This is the first description of inducible, multiple growth mode shifts in a single intact plant cell that directly impact its differentiation.

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Rhizoid formation inValonia(Siphonocladales, Chlorophyceae)

Cited by 2 publications

References 36 publications

Segregative cell division and the cytoskeleton in two species of the genus Struvea (Cladophorales, Ulvophyceae, Chlorophyta)

Segregative cell division and the cytoskeleton in two species of the genus Struvea (Cladophorales, Ulvophyceae, Chlorophyta)

Inducible growth mode switches influence Valonia rhizoid differentiation

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