Biologia plantarum 60:367-375, 2016 | DOI: 10.1007/s10535-015-0576-0

Differential responses of primary and lateral roots to indole-3-acetic acid, indole-3-butyric acid, and 1-naphthaleneacetic acid in maize seedlings

G. Márquez1, M. V. Alarcón2, J. Salguero1,*
1 Departamento de Biología Vegetal, Ecología y Ciencias de la Tierra, Universidad de Extremadura, Badajoz, Spain
2 Departamento de Hortofruticultura, Centro de Investigaciones Científicas y Tecnológicas de Extremadura, Gobierno de Extremadura, Badajoz, Spain

The role of auxins on root system architecture was studied by applying indole-3-acetic acid (IAA), indole-3-butyric acid (IBA), and 1-naphthaleneacetic acid (NAA) to maize roots and analysing the main processes involved in root development: primary root (PR) elongation, lateral root (LR) formation, and LR root elongation. We found that these effects were not dependent only on concentration, but also on the type of auxin applied. We also studied temporal changes in auxin inhibition of PR elongation. These temporal changes were analysed calculating the elongation ratio between two consecutive one day periods after auxin application. It was observed that a reduction in root elongation was also dependent on the type of auxin applied and its concentration. The inhibitory effect of IBA and IAA decreased on the second day, and the ratio also increased with the concentration. In contrast, NAA increased root elongation inhibition with time. Indeed, the ratio decreased as the NAA concentration increased. Regarding LR formation, we observed that external auxin increased only LR formation in certain zones of the PR. Finally, comparison of inhibition elongation associated with auxin in the LR and PR clearly demonstrates that PR elongation was more sensitive to auxin than LR elongation.

Keywords: auxins; lateral root density; root architecture; root elongation; Zea mays
Subjects: primary root growth; lateral root development; auxin; root elongation; maize

Received: June 19, 2015; Revised: September 2, 2015; Accepted: October 5, 2015; Published: June 1, 2016Show citation

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Márquez, G., Alarcón, M.V., & Salguero, J. (2016). Differential responses of primary and lateral roots to indole-3-acetic acid, indole-3-butyric acid, and 1-naphthaleneacetic acid in maize seedlings. Biologia plantarum, 60(2), 367-375. doi: 10.1007/s10535-015-0576-0.
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