生物
超氧化物歧化酶
转录因子
转基因
基因沉默
冷敏
细胞生物学
基因表达
转基因番茄
发起人
分子生物学
植物
转基因作物
氧化应激
生物化学
基因
突变体
作者
Zhen-Yu He,Tengteng Zhao,Zhao-Ping Yin,Jihong Liu,Yunjiang Cheng,Juan Xu
出处
期刊:Plant Science
[Elsevier]
日期:2020-09-01
卷期号:298: 110584-110584
被引量:15
标识
DOI:10.1016/j.plantsci.2020.110584
摘要
As one of the subtropical and tropical fruit trees, Citrus sinensis is sensitive to cold stress. However, most transcription factors (TFs) that regulate cold tolerance in citrus have not yet been reported. A phytochrome-interacting transcription factor (PIF) gene (CsPIF8) in citrus was significantly upregulated under cold stress. Overexpression of CsPIF8 increased cold tolerance in transgenic tomato plants and grapefruit callus, whereas virus-induced gene silencing-mediated suppression of PIF8 increased cold sensitivity in seedlings of Poncirus trifoliata. Superoxide dismutase (SOD) reduces the superoxide anion (O2−) level to enhance cold tolerance in plants. Chromatin immunoprecipitation combined with high-throughput sequencing, yeast one hybrid, electrophoretic mobility shift and dual luciferase assays showed that CsPIF8 directly bound the E-box (CANNTG) of CsSOD promoter and activated the promoter of CsSOD. Furthermore, the expression level of CsSOD and CsSOD activity were significantly increased, whereas the level of O2− was significantly reduced in the transgenic lines. The Poncirus trifoliata seedlings with VIGS-mediated suppression of PIF8 exhibited the opposite effects. These results have shown that CsPIF8 improved cold tolerance in citrus through regulating the expression level of SOD and SOD activity. These findings may provide novel insights into the regulation of PIF8 in the response to cold stress in citrus.
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