Abstract
The maize primary root is a cylindrical structure formed by consecutive zones: (a) the root apex contains the apical meristem, where cell divisions occur; (b) the elongation zone in which cells stop dividing and start to elongate; and (c) the maturation zone, where cells reach their definitive lengths, cell differentiation begins, and lateral roots initiate. In the root, three main tissue systems can be distinguished: the epidermis, the cortex, and the vascular cylinder. The first layer of the vascular cylinder is the pericycle. Cell cycle activation in pericycle cells is clearly connected with lateral root initiation.
Root grows basically by the elongation of its cells and branches through proliferation of pericycle founder cells. Auxin is the main hormone in regulating these both processes. Exogenous auxin inhibits root growth, increases transversal expansion, and enhances lateral root formation. As auxin also enhances ethylene production, it is difficult to know whether certain auxin effects are mediated by ethylene or not. Based on own results and on the specialized literature, we discussed on regulation by auxin and ethylene of the development of the maize root system. The emerging model is that auxin and ethylene regulate root elongation depending on concentration and that both regulators interact to regulate root growth. The role of auxin in regulating lateral root formation is clearly established. However, ethylene does not seem to have such a direct role in this process.
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Alarcón, M.V., Lloret, P.G., Salguero, J. (2014). The Development of the Maize Root System: Role of Auxin and Ethylene. In: Morte, A., Varma, A. (eds) Root Engineering. Soil Biology, vol 40. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-54276-3_5
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Print ISBN: 978-3-642-54275-6
Online ISBN: 978-3-642-54276-3
eBook Packages: Biomedical and Life SciencesBiomedical and Life Sciences (R0)