Li Mengxia, Zhu Yanchun, Li Susu, Zhang Wei, Yin Changxi, Lin Yongjun
National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China.
MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China.
Front Plant Sci. 2022 Mar 24;13:865302. doi: 10.3389/fpls.2022.865302. eCollection 2022.
The tubular-shaped unicellular extensions of plant epidermal cells known as root hairs are important components of plant roots and play crucial roles in absorbing nutrients and water and in responding to stress. The growth and development of root hair include, mainly, fate determination of root hair cells, root hair initiation, and root hair elongation. Phytohormones play important regulatory roles as signal molecules in the growth and development of root hair. In this review, we describe the regulatory roles of auxin, ethylene (ETH), jasmonate (JA), abscisic acid (ABA), gibberellin (GA), strigolactone (SL), cytokinin (CK), and brassinosteroid (BR) in the growth and development of plant root hairs. Auxin, ETH, and CK play positive regulation while BR plays negative regulation in the fate determination of root hair cells; Auxin, ETH, JA, CK, and ABA play positive regulation while BR plays negative regulation in the root hair initiation; Auxin, ETH, CK, and JA play positive regulation while BR, GA, and ABA play negative regulation in the root hair elongation. Phytohormones regulate root hair growth and development mainly by regulating transcription of root hair associated genes, including (), (), (), and (). Auxin and ETH play vital roles in this regulation, with JA, ABA, SL, and BR interacting with auxin and ETH to regulate further the growth and development of root hairs.
植物表皮细胞呈管状的单细胞延伸物，即根毛，是植物根系的重要组成部分，在吸收养分和水分以及应对胁迫方面发挥着关键作用。根毛的生长发育主要包括根毛细胞的命运决定、根毛起始和根毛伸长。植物激素作为信号分子在根毛的生长发育中发挥着重要的调节作用。在本综述中，我们描述了生长素、乙烯（ETH）、茉莉酸（JA）、脱落酸（ABA）、赤霉素（GA）、独脚金内酯（SL）、细胞分裂素（CK）和油菜素内酯（BR）在植物根毛生长发育中的调节作用。生长素、ETH和CK在根毛细胞的命运决定中起正向调节作用，而BR起负向调节作用；生长素、ETH、JA、CK和ABA在根毛起始中起正向调节作用，而BR起负向调节作用；生长素、ETH、CK和JA在根毛伸长中起正向调节作用，而BR、GA和ABA起负向调节作用。植物激素主要通过调节根毛相关基因的转录来调节根毛的生长发育，这些基因包括（）、（）、（）和（）。生长素和ETH在这种调节中起着至关重要的作用，JA、ABA、SL和BR与生长素和ETH相互作用，进一步调节根毛的生长发育。
