Guo Dongshu, Qin Genji
a State Key Laboratory of Protein and Plant Gene Research, College of Life Sciences, Peking University , Beijing , People's Republic of China.
b School of Advanced Agricultural Sciences, Peking University , Beijing , People's Republic of China.
Plant Signal Behav. 2016;11(3):e1150404. doi: 10.1080/15592324.2016.1150404.
As the sessile organisms, plants evolve different strategies to survive in adverse environmental conditions. The elaborate regulation of shoot branching is an important strategy for plant morphological adaptation to various environments, while the regulation of reactive oxygen species (ROS), salicylic acid (SA) and jasmonic acid (JA) is pivotal for plant responses to biotic and abiotic stresses. Recently, we have demonstrated that Arabidopsis EXB1, a WRKY transcription factor, is a positive regulator of shoot branching as a cover story in Plant Cell. Here we show that WRKY23, an EXB1 close member, has a redundant role in control of shoot branching. We further show that EXB1 is induced by H2O2, ABA or mannitol treatments, suggesting that EXB1 may also play roles in plant responses to abiotic stresses. RNA-sequencing (RNA-seq) analysis using 4EnhpEXB1-EXB1GR inducible line indicates that the genes involved in oxidative stress, oxidation reduction, SA or JA signaling pathway are regulated by EXB1 induction in a short time. We suggest that EXB1/WRKY71 transcription factor may play pivotal roles in plant adaptation to environments by both morphological and physiological ways.
作为固着生物，植物进化出不同的策略以在不利环境条件下生存。地上部枝条分支的精细调控是植物形态适应各种环境的重要策略，而活性氧（ROS）、水杨酸（SA）和茉莉酸（JA）的调控对于植物对生物和非生物胁迫的响应至关重要。最近，我们在《植物细胞》的封面文章中证明，拟南芥EXB1（一种WRKY转录因子）是地上部枝条分支的正调控因子。在此我们表明，EXB1的近亲成员WRKY23在地上部枝条分支控制中具有冗余作用。我们进一步表明，EXB1受H2O2、ABA或甘露醇处理诱导，这表明EXB1也可能在植物对非生物胁迫的响应中发挥作用。使用4EnhpEXB1-EXB1GR诱导系进行的RNA测序（RNA-seq）分析表明，参与氧化应激、氧化还原、SA或JA信号通路的基因在短时间内受EXB1诱导调控。我们认为，EXB1/WRKY71转录因子可能通过形态和生理方式在植物适应环境中发挥关键作用。
