Ebrahimian-Motlagh Saghar, Ribone Pamela A, Thirumalaikumar Venkatesh P, Allu Annapurna D, Chan Raquel L, Mueller-Roeber Bernd, Balazadeh Salma
Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany.
Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany.
Front Plant Sci. 2017 Dec 15;8:2118. doi: 10.3389/fpls.2017.02118. eCollection 2017.
Low water availability is the major environmental factor limiting growth and productivity of plants and crops and is therefore considered of high importance for agriculture affected by climate change. Identifying regulatory components controlling the response and tolerance to drought stress is thus of major importance. The NAC transcription factor (TF) JUNGBRUNNEN1 (JUB1) from extends leaf longevity under non-stress growth conditions, lowers cellular hydrogen peroxide (HO) level, and enhances tolerance against heat stress and salinity. Here, we additionally find that JUB1 strongly increases tolerance to drought stress in when expressed from both, a constitutive (CaMV ) and an abiotic stress-induced () promoter. Employing a yeast one-hybrid screen we identified HD-Zip class I TF AtHB13 as an upstream regulator of . AtHB13 has previously been reported to act as a positive regulator of drought tolerance. AtHB13 and JUB1 thereby establish a joint drought stress control module.
水分可利用性低是限制植物和作物生长及生产力的主要环境因素，因此对于受气候变化影响的农业至关重要。因此，确定控制对干旱胁迫响应和耐受性的调控成分至关重要。来自拟南芥的NAC转录因子（TF）JUNGBRUNNEN1（JUB1）在非胁迫生长条件下延长叶片寿命，降低细胞过氧化氢（H₂O₂）水平，并增强对热胁迫和盐胁迫的耐受性。在这里，我们还发现，当从组成型（CaMV 35S）和非生物胁迫诱导型（RD29A）启动子表达时，JUB1在拟南芥中强烈提高对干旱胁迫的耐受性。通过酵母单杂交筛选，我们确定HD-Zip I类TF AtHB13是JUB1的上游调节因子。此前有报道称AtHB13作为耐旱性的正向调节因子。AtHB13和JUB1从而建立了一个联合干旱胁迫控制模块。
