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The cell wall plays an important role in responses to various stresses. The cellulose synthase-like gene ( Csl ) family has been reported to be involved in the biosynthesis of the hemicellulose backbone. However, little information is available on their involvement in plant tolerance to low-temperature (LT) stress. In this study, a total of 42  Csls  were identified in  Musa acuminata  and clustered into six subfamilies ( CslA ,  CslC ,  CslD ,  CslE ,  CslG , and  CslH ) according to phylogenetic relationships. The genomic features of  MaCsl  genes were characterized to identify gene structures, conserved motifs and the distribution among chromosomes. A phylogenetic tree was constructed to show the diversity in these genes. Different changes in hemicellulose content between chilling-tolerant and chilling-sensitive banana cultivars under LT were observed, suggesting that certain types of hemicellulose are involved in LT stress tolerance in banana. Thus, the expression patterns of  MaCsl  genes in both cultivars after LT treatment were investigated by RNA sequencing (RNA-Seq) technique followed by quantitative real-time PCR (qPCR) validation. The results indicated that  MaCslA4/12 ,  MaCslD4  and  MaCslE2  are promising candidates determining the chilling tolerance of banana. Our results provide the first genome-wide characterization of the  MaCsls  in banana, and open the door for further functional studies.

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Genome-Wide Identification of Banana Csl Gene Family and Their Different Responses to Low Temperature between Chilling-Sensitive and Tolerant Cultivars