Publications by authors named "A S Petitot"
Article Synopsis
- - Jasmonate is a crucial hormone in plants that helps regulate development and responses to stress, primarily through the COI receptor which targets specific repressors for degradation, leading to the activation of defense genes.
- - In rice, three COI genes (OsCOI1a, OsCOI1b, and OsCOI2) play important roles, with OsCOI2 recently identified as key in transcriptional changes during jasmonate signaling, particularly linked to root development and stress response.
- - Mutations in OsCOI2 result in less effective responses to jasmonate compared to other COI genes, suggesting that OsCOI2 significantly influences the balance between growth and defense while also affecting the plant's
During herbivory, chewing insects deposit complex oral secretions (OS) onto the plant wound. Understanding how plants respond to the different cues of herbivory remains an active area of research. In this study, we used an herbivory-mimick experiment to investigate the early transcriptional response of rice plants leaves to wounding, OS, and OS microbiota from Spodoptera frugiperda larvae.
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- Pearl millet is highly resilient to heat and drought, making it a key food source in the sub-Saharan Sahel region where its root traits help with establishment in tough conditions.
- Research shows that the plant's fast-growing primary root is crucial for early drought tolerance, which is vital for agricultural success in the Sahel.
- Genetic studies identified a specific glutaredoxin gene linked to root growth and stress resilience, indicating that this gene plays a significant role in helping pearl millet adapt to its harsh environment.
COI1-mediated perception of jasmonate is critical for plant development and responses to environmental stresses. Monocots such as rice have two groups of COI genes due to gene duplication: OsCOI1a and OsCOI1b that are functionally equivalent to the dicotyledons COI1 and OsCOI2 whose function remains unclear. In order to assess the function of OsCOI2 and its functional redundancy with COI1 genes, we developed a series of rice mutants in the 3 genes OsCOI1a, OsCOI1b and OsCOI2 by CRISPR Cas9-mediated editing and characterized their phenotype and responses to jasmonate.
View Article and Find Full Text PDFLateral root organogenesis is a key process in the development of a plant's root system and its adaptation to the environment. During lateral root formation, an early phase of cell proliferation first produces a four-cell-layered primordium, and only from this stage onwards is a root meristem-like structure, expressing root stem cell niche marker genes, being established in the developing organ. Previous studies reported that the gene regulatory network controlling lateral root formation is organized into two subnetworks whose mutual inhibition may contribute to organ patterning.
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