避光
拟南芥
生物
基因
拟南芥
转录因子
下胚轴
生长素
光敏色素
抄写(语言学)
突变体
细胞生物学
遗传学
植物
红灯
哲学
语言学
作者
Benny Jian Rong Sng,Kien Van Vu,Ian Kin Yuen Choi,Hui Jun Chin,In‐Cheol Jang
摘要
Abstract Plants respond to vegetative shade with developmental and physiological changes that are collectively known as shade avoidance syndrome (SAS). Although LONG HYPOCOTYL IN FAR-RED 1 (HFR1) is known to be a negative regulator of SAS by forming heterodimers with other basic helix-loop-helix (bHLH) transcription factors to inhibit them, its function in genome-wide transcriptional regulation has not been fully elucidated. Here, we performed RNA-sequencing analyses of Arabidopsis thaliana hfr1-5 mutant and HFR1 overexpression line [HFR1(ΔN)-OE] to comprehensively identify HFR1-regulated genes at different time points of shade treatment. We found that HFR1 mediates the trade-off between shade-induced growth and shade-repressed defence, by regulating the expression of relevant genes in the shade. Genes involved in promoting growth, such as auxin biosynthesis, transport, signalling and response were induced by shade but suppressed by HFR1 under both short and long durations of shade. Likewise, most ethylene-related genes were shade-induced and HFR1-repressed. However, shade suppressed defence-related genes, while HFR1 induced their expression, especially under long durations of shade treatment. We demonstrated that HFR1 confers increased resistance to bacterial infection under shade.
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