期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 286, 期 -, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2023.154006
关键词
Abiotic stress; Antioxidants; CBL-Interacting protein kinase (CIPK); Hybrid bermudagrass; Proline; Stress responsive genes
CdtCIPK21 is a serine/threonine kinase isolated from triploid bermudagrass, which transmits the Ca2+ signal sensed by CBL proteins. It is expressed in multiple tissues and is induced by salinity, dehydration, and chilling, while inhibited by ABA treatment.
Calcineurin B-like-interacting protein kinase (CIPK) is a serine/threonine kinase, which transmits the Ca2+ signal sensed by CBL proteins. A CdtCIPK21 showing highly identical to OsCIPK21 in rice was isolated from triploid bermudagrass (Cynodon dactylon x Cynodon transvaalensis). CdtCIPK21 transcript could be detected in roots, rhizomes, stems, stolons, and leaves, with highest level in roots. It was induced by salinity, dehydration and chilling, but reduced by ABA treatment. Transgenic rice plants overexpressing CdtCIPK21 had decreased salt and drought tolerance as well as ABA sensitivity but increased chilling tolerance. Lower SOD and CAT activities was observed in transgenic lines under salinity and drought stress conditions, but higher levels under chilling stress. Similarly, lower levels of proline concentration and P5CS1 and P5CS2 transcripts were maintained in transgenic lines under salinity and drought stresses, and higher levels were maintained under chilling. In addition, transgenic lines had lower transcript levels of ABA-independent genes (OsDREB1A, OsDREB1B, and OsDREB2A) and ABA responsive genes (OsLEA3, OsLIP9, and OsRAB16A) under salinity and drought but higher levels under chilling compared with WT. The results suggest that CdtCIPK21 regulates salt and drought tolerance negatively and chilling tolerance positively, which are associated with the altered ABA sensitivity, antioxidants, proline accumulation and expression of ABA-dependent and ABA-independent stress responsive genes.
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