Plant hybrid proline-rich proteins (HyPRPs) usually consist of an N-terminal signal peptide, a central proline-rich domain, and a conserved eight-cysteine motif C-terminal domain. In this study, one gene (designated as GhHyPRP4) encoding putative HyPRP was isolated from cotton cDNA library. Northern blot and quantitative reverse transcriptasepolymerase chain reaction analyses revealed that GhHyPRP4 was preferentially expressed in leaves. Under cold stress, GhHyPRP4 expression was significantly up-regulated in leaves of cotton seedlings. Using t...
