Proline Metabolism Genes in Transgenic Plants: Meta-Analysis under Drought and Salt Stress.

The amino acid proline accumulates in plants during abiotic stresses such as drought and salinity and is considered a reliable marker of environmental stress. While its accumulation is well established, its precise role in stress tolerance and its underlying molecular mechanism remain less clear. To address these issues, we performed a meta-analysis-a robust statistical technique that synthesizes results from multiple independent studies while accounting for experimental differences.