Pro-rich proteins (PRPs) represent one family of Pro- and Hyp-rich structural cell wall proteins that are initially identified as wound-induced gene products in carrot storage roots. Accumulated evidences demonstrate that PRP genes are regulated by various abiotic and biotic stresses and may play a role in plant responses to changes in living conditions. In our previous study, a gene encoding a proline-rich protein designated as GhPRP5 was isolated from cotton cDNA libraries. To validate its function, in th...