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Volvox ovalis

Page history last edited by Aurora Nedelcu 12 years, 8 months ago

 

Images

 

 

Taxonomic characters

- can be distinguished from V. spermatosphaera by its larger gonidia, and from V. tertius by visible differences in gonidial chloroplast morphology (Nozaki and Coleman 2011)

- molecular phylogenetic analyses of the five chloroplast genes and the internal transcribed spacer (ITS) regions of nuclear rDNA indicated that
V. ovalis is closely related to Volvox spermatosphaera and ⁄ or Volvox tertius (Nozaki and Coleman 2011)

- belongs to the section Merrillosphaera

 

Morphology / Structure

 - ovoid or elliptical, with an expanded anterior region

- 1,000–2,000 somatic cells that are not linked by cytoplasmic bridges

- 8–12 gonidia in the posterior region (gonidia measure 50–55 lm in diameter)

- no visibly asymmetric cleavage divisions (gonidia of the next generation are not recognizable embryos prior to inversion) (Nozaki and Coleman 2011)

 

Life history

- sexual spheroids could not be observed

 

Ecology

- isolated from a pond near College Station, Texas.

 

Availability in culture collections or research labs

 

 

Media and growth conditions in culture

Nozaki and Coleman 2011:

"The culture was at first maintained in media lacking major organic compounds [e.g.,C medium (Ichimura 1971, Kasai et al. 2009), AF-6 medium
(Kato 1982, Kasai et al. 2009)] because of bacterial contamination. After isolating unhatched juvenile spheroids from the parent by a micropipette to remove the contaminating bacteria, the culture was maintained in VTAC medium (modified Volvox medium; Nozaki et al. 1989, Kasai et al. 2009). "

"The cultures were grown in screw-cap tubes (18 · 150 mm) containing ca 11 mL medium at ca 25C on a 14:10 light:dark schedule under cool-white fluorescent lamps at an intensity of 110–150 umol/m2/s."

 

 

Sequence Information

 

 

Links to other databases

 

 

Miscellaneous

The strain ‘‘Volvox ovalis’’ was established by Dr. Elenor R. Cox (Texas A&M University), using a water sample collected
in a pond near College Station, Texas, sometime before 2000 (Nozaki and Coleman 2011).

 

 

Selected References

A NEW SPECIES OF VOLVOX SECT. MERRILLOSPHAERA (VOLVOCACEAE, CHLOROPHYCEAE) FROM TEXAS
Author(s): Nozaki H, Coleman AW
Source: JOURNAL OF PHYCOLOGY   Volume: 47   Issue: 3   Pages: 673-679   Published: JUN 2011

 

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