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The  CPP -like plant‐specific transcription factor has a prominent role in plant development and growth through cell division and differential activities. However, little information is available about the  CPP  gene family in  Triticum aestivum  L. Herein, we identified 37 and 11  CPP  genes in the wheat and rice genome databases, respectively. The phylogeny of the CPP protein-like family members was further divided into five subfamilies based on structural similarities and phenotypic functional diversities. The  in silico  expression analysis showed that  CPP  genes are highly expressed in some tissues, such as shoot apex, shoot, leaf, leaf sheath, and microspore. Furthermore, the qRT-PCR found higher expression for  TaCPP  gene family members in leaf, leaf blade, young spike, mature spike, and differential expression patterns under abiotic stresses, including heat, drought, salt, and hormonal treatment, such as indole acetic acid and 1-aminocyclopropane-1 carboxylic acid. We found that  CPP  gene family members are mostly located in the nucleus after infiltrating the  CPP5-1B-GFP  and  TaCPP11-3B-GFP  into tobacco leaves. The overexpression of the  TaCPP5-1D  gene revealed that the  CPP  gene positively regulates the germanium, shoot, and root activities in  Arabidopsis . The  TaCPP5-1D -overexpressed plants showed less anti-oxidative sensitivity under drought stress conditions. These results demonstrated that TaCPP5-1D protein has a crucial contribution by interacting with TaCPP11-3B protein in maintaining stress homeostasis under the natural and unfavorable environmental conditions for growth, development, and stress resistance activities. Therefore, this study could be used as pioneer knowledge to further investigate the function of  CPP  genes in plant growth and development.

Genome-wide identification and expression analysis of CPP -like gene family in Triticum aestivum L. under different hormone and stress conditions