Genome-Wide Analysis, Characterization, Expression and Function of SERK Gene Family in Phyllostachys edulis

Somatic mmbryogenesis receptor-like kinase (SERK) is a kind of protein kinase widely distributed in plants. It plays a vital role in regulating plant immunity and responses to abiotic stress. The SERK gene family has not been systematically studied in moso bamboo (Phyllostachys edulis). In this study, we identified six PeSERK genes and classified them into four groups in moso bamboo. PeSERKs of each group shared a highly similar distribution of conserved domains. Cis-element analysis indicated that many stress and hormone response elements are distributed on the promoters of PeSERKs. Moreover, we analyzed the chromosomal locations and synteny of PeSERKs. A collinear gene pair, PeSERK1 and PeSERK3, shared a high similarity, 93%, and the expression analysis showed similar expression patterns. Compared to PeSERK3, PeSERK1 had a higher expression in all tissues examined and all stages of shoot development. PeSERK3 was expressed mainly in leaf sheaths but with a low expression in other tissues. The expressions of PeSERKs were analyzed in seedlings under abiotic and hormone treatments using qRT-PCR. Except for PeSERK1 and PeSERK3, the expressions of most genes were downregulated or had no big difference at 0 h of drought treatment. Under drought treatment, PeSERK1 and PeSERK3 had a similar expression trend of increasing first and then decreasing. However, the expression level of PeSERK3 was higher than PeSERK1 after 3 h of drought treatment. PeSERK3 might play a more vital role in the drought stress response than PeSERK1. This study provides a theoretical basis for the further study of the SERK response to stress conditions in moso bamboo.