**5. Conclusions**

The findings of our research work briefly explain that the pepper chitin-binding protein gene family performs a vital role in the complex signaling networks system in response to numerous biotic and abiotic stresses and exogenous hormone applications. Every member of CaChi has its specific expression pattern and functional preference. Meanwhile, the particular molecular mechanism and function of pepper chitin-binding protein are still unclear. Additionally, the chitins–genes connections are also weakly discussed. The various transcription pattern of pepper chitin genes has been observed in tissues due to fluctuations in environmental circumstances, for example salt, drought and hormones, suggesting the diverse roles and inimitable transcription levels of chitin genes in the pepper plant growth, development and response to different stresses. Accordingly, different changes in transcription level in the same pepper chitin gene against several biotic and ambient alterations confirm the differences in their mechanism of regulation. These outcomes clarify the background for further experiments and provide the basic knowledge to explore the role and the possible cross-talk between pepper chitin-binding proteins in plants.

**Supplementary Materials:** Supplementary materials can be found at http://www.mdpi.com/1422-0067/19/8/ 2216/s1.

**Author Contributions:** Conceptualization, M.A. and Z.-H.G., Methodology, M.A. and W.-X.G., Software, G.-X.C., Validation, M.A., I.M. and A.K., Formal Analysis, H.-X.Z.; Investigation, Z.-H.G., Resources, Z.-H.G., Data Curation, S.u.H., Writing-Original Draft Preparation, M.A., Writing-Review & Editing, I.M. and A.K., Supervision, Z.-H.G., Project Administration, Z.-H.G. and D.-X.L., Funding Acquisition, Z.-H.G. and D.-X.L.

**Funding:** This work was supported through funding from the Independent Innovation Fund Project of Agricultural Science and Technology in Jiangsu (No. CX (17) 3040), and the National Natural Science Foundation of China (No. 31272163 and No. U1603102).

**Conflicts of Interest:** The authors declare no conflict of interest.
