Pedro Joaquín Casero

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Lateral root development in Arabidopsis provides a model for the study of hormonal signals that regulate postembryonic organogenesis in higher plants. Lateral roots originate from pairs of pericycle cells, in several cell files positioned opposite the xylem pole, that initiate a series of asymmetric, transverse divisions. The auxin transport inhibitor(More)
Recent studies in the model plant Arabidopsis provide new insight into the regulation of root architecture, a key determinant of nutrient- and water-use efficiency in crops. Lateral root (LR) primordia originate from a subset of pericycle founder cells. Sophisticated mass-spectroscopy-based techniques have been used to map the sites of biosynthesis of auxin(More)
Arabidopsis root architecture is regulated by shoot-derived signals such as nitrate and auxin. We report that mutations in the putative auxin influx carrier AUX1 modify root architecture as a result of the disruption in hormone transport between indole-3-acetic acid (IAA) source and sink tissues. Gas chromatography-selected reaction monitoring-mass(More)
In roots ofRaphanus sativus, Helianthus annuus, Zea mays, andDaucus carota, lateral root initiation occurs when a pair of neighbouring elongated and highly vacuolated pericycle cells in the same column almost simultaneously undergo asymmetrical transversal division. This produces a pair of very short pericycle cells lying end-to-end, flanked above and below(More)
Monoclonal antibodies recognizing two classes of developmentally regulated plant cell surface components – arabinogalactan-proteins (AGPs) and extensins – have been used to immunolabel cells at the root apices of four species with different characteristics of pericycle and vascular tissue development. Root apices of pea (Pisum sativum L.), radish (Raphanus(More)
In plants, lateral roots originate from pericycle founder cells that are specified at regular intervals along the main root. Here, we show that Arabidopsis (Arabidopsis thaliana) SKP2B (for S-Phase Kinase-Associated Protein2B), an F-box protein, negatively regulates cell cycle and lateral root formation as it represses meristematic and founder cell(More)
Overall root architecture is the combined result of primary and lateral root growth and is influenced by both intrinsic genetic programs and external signals. One of the main questions for root biologists is how plants control the number of lateral root primordia and their emergence through the main root. We recently identified S-phase kinase-associated(More)
ADOR is an aqueous extract obtained from the dry olive mill residue (DOR) which contains the majority of its soluble phenolic compounds, which are responsible for its phytotoxic properties. Some studies have shown that ADOR negatively affects seed germination. However, to date, few studies have been carried out on the effect of ADOR on the oxidative stress(More)
Far from the apical meristem of adventitious roots ofAllium cepa, the pericycle shows great proliferative activity related to lateral root initiation. A group of mother pericycle cells undergoes asymmetrical transverse and periclinal divisions following a well-established pattern. Successive asymmetrical transverse divisions, progressing from one end of the(More)
Three pericycle cell types (opposite xylem, opposite phloem and intervening) distinguished by their location in relation to different elements of the vascular system were studied in the adventitious root ofAllium cepa L. Changes in cell length and mitotic index were analysed in these cells along the apical meristem and elongation zone of the root. The(More)