Table 2.

Levels of gene expression of enzymes of interest in Lactobacillus plantarum and Lactobacillus brevis.

	Gene expression level
Strain	Xylanase	β-xylosidase	glucose-6-phosphate dehydrogenase	KanR
L. plantarum	++	+++	+	+
L. brevis	+++	++	+	+++
L. sakei	+++	++	+	++

Note:

‘+’ – weak expression (less than 1000 units).

‘++’ – medium expression (between 1000 and 3000 units).

‘+++’ – higher expression (more than 3000 units).