期刊
PLANT JOURNAL
卷 106, 期 5, 页码 1278-1297出版社
WILEY
DOI: 10.1111/tpj.15234
关键词
CIPK; CBL; drought stress; flavonoids; pigeon pea; yeast two‐ hybrid
资金
- The National Key R&D Program of China [2019YFD1000605-1]
- National Natural Science Foundation of China [31930076, 31901281, 31922058, 31800509]
- Outstanding Young Talent Fund in Beijing Forestry University [2019JQ03009]
- 'Heilongjiang Touyan Innovation Team Program' (Tree Genetics and Breeding Innovation Team)
- The 111 Project [B20088]
The study identified a role for the CcCIPK14-CcCBL1 complex in drought stress tolerance through the regulation of flavonoid biosynthesis in pigeon pea, which led to increased survival rates in transgenic plants overexpressing CcCIPK14 and CcCBL1.
Calcineurin B-like (CBL)-interacting protein kinases (CIPKs) play a central role in Ca2+ signalling and promote drought tolerance in plants. The CIPK gene family in pigeon pea (Cajanus cajan L.), a major food crop affected by drought, has not previously been characterised. Here, we identified 28 CIPK genes in the pigeon pea genome. Five CcCIPK genes were strongly upregulated in roots upon drought treatment and were selected for further characterisation. Overexpression of CcCIPK13 and CcCIPK14 increased survival rates by two- to three-fold relative to controls after 14 days of drought. Furthermore, the three major flavonoids, genistin, genistein and apigenin, were significantly upregulated in the same transgenic plants. Using CcCIPK14 as bait, we performed a yeast two-hybrid screen and identified six interactors, including CcCBL1. CcCIPK14 exhibited autophosphorylation and phosphorylation of CcCBL1 in vitro. CcCBL1-overexpressed plants displayed higher survival rates upon drought stress as well as higher expression of flavonoid biosynthetic genes and flavonoid content. CcCIPK14-overexpressed plants in which CcCBL1 transcript levels were reduced by RNA interference had lower survival rates, which indicated CcCBL1 in the same pathway as CcCIPK14. Together, our results demonstrate a role for the CcCIPK14-CcCBL1 complex in drought stress tolerance through the regulation of flavonoid biosynthesis in pigeon pea.
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