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As far as I understand bacteria of order Lactobacillales are all LAB (Lactic acid bacteria). So often "Lactobacillales" and "LAB" are used interchangeably.

But I also thought that this is not the whole truth, because there are LAB which are not of order Lactobacillales.

Can anyone elaborate on this topic and is there a paper/review explaining the consensus on this topic?

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Lactic acid fermentation is the most common type of fermentation among Eubacteria, and it's found on several genera.

Actually, regarding the fermentation types, we can say as a general rule:

  • Ethanol fermentation: found in Plants and Fungi.
  • Lactic acid fermentation: found in Bacteria and Animals.

That being said, according to the Todar's Online Textbook of Bacteriology,

Although many genera of bacteria produce lactic acid as a primary or secondary end-product of fermentation, the term Lactic Acid Bacteria is conventionally reserved for genera in the Order Lactobacillales.

And according to Lactic Acid Bacteria: Microbiological and Functional Aspects, Fourth Edition:

They [LAB] belong to the Phylum Firmicutes, Class Bacilli and Order Lactobacillales.

These genera are: Lactobacillus, Leuconostoc, Pediococcus, Lactococcus, Streptococcus, Carnobacterium, Enterococcus, Oenococcus, Tetragenococcus, Vagococcus and Weisella.

The problem here is that not all lactic acid producing bacteria are called a LAB. Therefore, Lactobacillales and LAB can be used interchangeably. However, you cannot say that all bacteria that perform lactic acid fermentation are LAB.

Sources:

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  • $\begingroup$ Thanks a lot for your reply. I found this sources already. Is there any review/paper confirming this as the consensus among taxonomists? $\endgroup$ – Michael May 3 '17 at 12:30
  • $\begingroup$ Have a look at this book, page 2: books.google.com.au/… $\endgroup$ – user24284 May 3 '17 at 12:46

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