根毛
生物
细胞生物学
活性氧
NADPH氧化酶
表皮(动物学)
叶尖生长
毛细胞
钙
生物物理学
生物化学
植物
解剖
耳蜗
花粉管
化学
基因
花粉
有机化学
授粉
作者
Xinxin Zhang,Ang Bian,Teng Li,Lifei Ren,Li Li,Shuai Yuan,Qun Zhang
出处
期刊:Plant Signaling & Behavior
[Informa]
日期:2022-08-07
卷期号:17 (1)
被引量:7
标识
DOI:10.1080/15592324.2022.2106410
摘要
Root hairs are filamentous extensions from epidermis of plant roots with growth limited to the apical dome. Cell expansion undergoes tightly regulated processes, including the coordination between cell wall loosening and cell wall crosslinking, to form the final shape and size. Tip-focused gradients and oscillations of reactive oxygen species (ROS) together with calcium ions (Ca2+) as indispensable regulated mechanisms control rapid and polarized elongation of root hair cells. ROS homeostasis mediated by plasma membrane-localized NADPH oxidases, known as respiratory burst oxidase homologues (RBOHs), and class III cell wall peroxidases (PRXs), modulates cell wall properties during cell expansion. The expression levels of RBOHC, an NADPH oxidase that produces ROS, and class III PRXs are directly upregulated by ROOT HAIR DEFECTIVE SIX-LIKE 4 (RSL4), encoding a basic-helix-loop-helix (bHLH) transcription factor, to modulate root hair elongation. Cyclic nucleotide-gated channels (CNGCs), as central regulators of Ca2+ oscillations, also regulate root hair extension. Here, we review how the gradients and oscillations of Ca2+ and ROS interact to promote the expansion of root hair cells.
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