Required for the maintenance of meristems and stem cells through the reduction of DNA damage (PubMed:21781195). Promotes telomere integrity by maintaining telomere length and proper architecture of the chromosome terminus (PubMed:23572541). Negatively regulates telomerase repeat addition processivity (PubMed:23572541). Hampers contacts between enzymatically active telomerase and CST complex (PubMed:25329641).