Abstract
CLAVATA3 (CLV3)/EMBRYO SURROUNDING REGION (ESR)-related (CLE) genes encode a group of peptide hormones, which coordinate cell proliferation and differentiation in plants. Tiger nut (Cyperus esculentus L.) is a perennial monocot plant that produces oil-rich tubers. However, the mechanisms regulating tuber development in tiger nut are poorly understood, and nothing is known about CLE genes in tiger nut. In this study, we identified 34 CLE genes in the genomes, proteomes, and transcriptomes of C. esculentus (CeCLE). We analyzed their gene structures and expression profiles in different parts of the plant, at three stages of tuber development and in roots in response to dehydration stress. We found a relatively high expression level of CeCLE13 in growing tuber and suggested that the corresponding CLE peptide could be involved in the regulation of tuberization. We also analyzed CeCLE gene sequences in the genome of the most productive K-17 variety in the N. I. Vavilov All-Russian Institute of Plant Genetic Resources collection and found many single nucleotide polymorphisms, insertions, and deletions. Our data provides fundamental information for future research on tiger nut growth and tuberization.
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