Root hair is an important organ for plants to absorb nutrients, water and fixed plants. The development and function of root hair has always been the research focus of plant physiologists and agronomists. Root hair growth is accomplished by regulating the extension of the apex and cell wall, and the oscillation of reactive oxygen species (ROS) and H + Flux regulates the development of root hair. Scientist Gilroy and others from the University of Wisconsin published an article in "PNAS", using non-damaging micro-measurement technology and fluorescence technology to find that the oscillating growth of root hairs is related to the increase in the extracellular pH and ROS The oscillation lags behind the growth oscillation by 7s. Artificially increasing the extracellular pH and ROS can prevent root hair elongation, and removing ROS will cause rapid growth of root hair. The root hairs of rhd2-1 mutants with root hair defects lack the function of NADPH oxidase ATRBOH C, which promotes the transformation of tip growth. This mutant can produce root hair by increasing the pH of the growing environment, such as a pH greater than 6.0. The root hairs produced by high pH adjustment show lower intracellular ROS levels and lack the oscillation of ROS at the tip. However, they can also show significant tip growth, including the tip forming a Ca2 + gradient to drive tip growth, so ATRBOH C is not a necessary component to maintain tip growth. These results indicate that root hair elongation is related to spatially different extracellular pH and ROS regulation, which may affect cell wall expansion and cell polarity. The change of pH involves the oscillating activation or deactivation of the channels of H + transporters such as H + -ATPase and H + or OH-. The identification of these H + transporters and signaling elements involves the co-regulation of H + flux and ATRBOH C activity is the key to future research. Keywords: NADPH oxidase; proton flux; reactive oxygen species (ROS); root hair; tip growth; rhd2; ATRBOH C Reference: Monshausen GB, et al. PNAS, 2007, 104: 20996–21001
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