Abstract
Rice is an essential but highly stress-susceptible crop, whose root system plays an important role in plant development and stress adaptation. The rice root system architecture is controlled by gene regulatory networks involving different phytohormones including auxin, jasmonate, and gibberellin. Gibberellin is generally known as a molecular clock that interacts with different pathways to regulate root meristem development. The exogenous treatment of rice plantlets with Gibberellin reduced the number of crown roots, whilst the exogenous jasmonic acid treatment enhanced them by involving a Germin-like protein OsGER4. Due to those opposite effects, this study aims to investigate the effect of Gibberellin on crown root development in the rice mutant of the plasmodesmal Germin-like protein OsGER4. Under exogenous gibberellin treatment, the number of crown roots significantly increased in osger4 mutant lines and decreased in the OsGER4 overexpressed lines. GUS staining showed that OsGER4 was strongly expressed in rice root systems, particularly crown and lateral roots under GA3 application. Specifically, OsGER4 was strongly expressed from the exodermis, epidermis, sclerenchyma to the endodermis layers of the crown root, along the vascular bundle and throughout LR primordia. The plasmodesmal protein OsGER4 is suggested to be involved in crown root development by maintaining hormone homeostasis, including Gibberillin.
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No datasets were generated or analysed during the current study.
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This work is funded by the Vietnam Academy of Science and Technology under grant number QTKR01.01/24–25.
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TTN, TCN, PTD conducted the experiments. HTMT wrote the manuscript. All authors have read and approved the manuscript for submission.
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Nguyen, T.T., Nguyen, T.C., Do, P.T. et al. Effect of gibberellin on crown root development in the mutant of the rice plasmodesmal Germin-like protein OsGER4. Funct Integr Genomics 24, 59 (2024). https://doi.org/10.1007/s10142-024-01341-y
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DOI: https://doi.org/10.1007/s10142-024-01341-y