热带与非热带来源的植物乳植杆菌的糖源利用差异研究OA

Lactiplantibacillus plantarum exhibits extensive carbohydrate metabolic capabilities.This study compared the distribution of carbohydrate-active enzyme(CAZy)genes,differential carbohydrate utilization,and variations in free amino acid content during green pepper fermentation between tropical and nontropical strains.Key findings revealed that tropical strains possessed a significantly higher av-erage number of glycosyltransferase(GT)family genes(310±13)compared to nontropical strains(296±5,P＜0.05),with GT2 and GT4 families being particularly enriched.Tropical strains showed superior rhamnose metabolism[shorter generation time:(0.62±0.11)h vs.(1.35±0.27)h,P＜0.05]but weaker utilization of sucrose[generation time:(1.43±0.06)h vs.(1.09±0.06)h)and fructose[(1.42±0.09)h vs.(1.03±0.09)h,P＜0.01].No significant differences were observed for xylose,maltose,stachyose,or glucose(P＞0.05).Fermented green peppers inoculated with tropical strains contained higher levels of arginine[(5.15±0.11)mg/100 g vs.(2.69±0.75)mg/100 g]and serine[(2.09±0.22)mg/100 g vs.(0.83±0.53)mg/100 g]compared to nontropical strains(P≤0.05).Notably,arginine content exceeded that of the commercial control[(2.10±0.36)mg/100 g,P≤0.001].Geographic origin drives adaptive divergence in CAZy genes(particularly GT families)of L.plantarum,providing a rationale for developing region-specific probiotics.