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  • 1.
    Lakehal, Abdellah
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    A molecular network mediating adventitious root initiation in Arabidopsis thaliana2019Doctoral thesis, comprehensive summary (Other academic)
    The full text will be freely available from 2020-11-08 07:00
  • 2.
    Lakehal, Abdellah
    et al.
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Chaabouni, Salma
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Cavel, Emilie
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Le Hir, Rozenn
    Ranjan, Alok
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Rahneshan, Zahra
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Novák, Ondřej
    Pacurar, Daniel I
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Perrone, Irene
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Jobert, François
    Gutierrez, Laurent
    Bako, Laszlo
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Bellini, Catherine
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    A Molecular Framework for the Control of Adventitious Rooting by TIR1/AFB2-Aux/IAA-Dependent Auxin Signaling in Arabidopsis2019In: Molecular Plant, ISSN 1674-2052, E-ISSN 1752-9867, Vol. 12, no 11, p. 1499-1514Article in journal (Refereed)
    Abstract [en]

    In Arabidopsis thaliana, canonical auxin-dependent gene regulation is mediated by 23 transcription factors from the AUXIN RESPONSE FACTOR (ARF) family that interact with auxin/indole acetic acid repressors (Aux/IAAs), which themselves form co-receptor complexes with one of six TRANSPORT INHIBITOR1/AUXIN-SIGNALLING F-BOX (TIR1/AFB) proteins. Different combinations of co-receptors drive specific sensing outputs, allowing auxin to control a myriad of processes. ARF6 and ARF8 are positive regulators of adventitious root initiation upstream of jasmonate, but the exact auxin co-receptor complexes controlling the transcriptional activity of these proteins has remained unknown. Here, using loss-of-function mutants we show that three Aux/IAA genes, IAA6, IAA9, and IAA17, act additively in the control of adventitious root (AR) initiation. These three IAA proteins interact with ARF6 and/or ARF8 and likely repress their activity in AR development. We show that TIR1 and AFB2 are positive regulators of AR formation and TIR1 plays a dual role in the control of jasmonic acid (JA) biosynthesis and conjugation, as several JA biosynthesis genes are up-regulated in the tir1-1 mutant. These results lead us to propose that in the presence of auxin, TIR1 and AFB2 form specific sensing complexes with IAA6, IAA9, and/or IAA17 to modulate JA homeostasis and control AR initiation.

  • 3.
    Lakehal, Abdellah
    et al.
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Dob, Asma
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Novak, Ondrej
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Department of Forest Genetics and Physiology, Swedish Agriculture University, Umea, Sweden.
    Bellini, Catherine
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France.
    A DAO1-Mediated Circuit Controls Auxin and Jasmonate Crosstalk Robustness during Adventitious Root Initiation in Arabidopsis2019In: International Journal of Molecular Sciences, ISSN 1422-0067, E-ISSN 1422-0067, Vol. 20, no 18, article id 4428Article in journal (Refereed)
    Abstract [en]

    Adventitious rooting is a post-embryonic developmental program governed by a multitude of endogenous and environmental cues. Auxin, along with other phytohormones, integrates and translates these cues into precise molecular signatures to provide a coherent developmental output. Auxin signaling guides every step of adventitious root (AR) development from the early event of cell reprogramming and identity transitions until emergence. We have previously shown that auxin signaling controls the early events of AR initiation (ARI) by modulating the homeostasis of the negative regulator jasmonate (JA). Although considerable knowledge has been acquired about the role of auxin and JA in ARI, the genetic components acting downstream of JA signaling and the mechanistic basis controlling the interaction between these two hormones are not well understood. Here we provide evidence that COI1-dependent JA signaling controls the expression of DAO1 and its closely related paralog DAO2. In addition, we show that the dao1-1 loss of function mutant produces more ARs than the wild type, probably due to its deficiency in accumulating JA and its bioactive metabolite JA-Ile. Together, our data indicate that DAO1 controls a sensitive feedback circuit that stabilizes the auxin and JA crosstalk during ARI.

  • 4.
    Lakehal, Abdellah
    et al.
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umea university.
    Dob, Asma
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Rahneshan, Zahra
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Novak, Ondrej
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Escamez, Sacha
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Strnad, Miroslav
    Tuominen, Hannele
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Bellini, C
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    A Jasmonate-mediated molecular network provides cell-reprogramming decisions for organogenesis in Arabidopsis2019Manuscript (preprint) (Other academic)
  • 5.
    Pacurar, Daniel Ioan
    et al.
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Pacurar, Monica Lacramioara
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Lakehal, Abdellah
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Pacurar, Andrea Mariana
    Ranjan, Alok
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Bellini, Catherine
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    The Arabidopsis Cop9 signalosome subunit 4 (CNS4) is involved in adventitious root formation2017In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 628Article in journal (Refereed)
    Abstract [en]

    The COP9 signalosome (CSN) is an evolutionary conserved multiprotein complex that regulates many aspects of plant development by controlling the activity of CULLIN-RING E3 ubiquitin ligases (CRLs). CRLs ubiquitinate and target for proteasomal degradation a vast number of specific substrate proteins involved in many developmental and physiological processes, including light and hormone signaling and cell division. As a consequence of CSN pleiotropic function, complete loss of CSN activity results in seedling lethality. Therefore, a detailed analysis of CSN physiological functions in adult Arabidopsis plants has been hampered by the early seedling lethality of csn null mutants. Here we report the identification and characterization of a viable allele of the Arabidopsis COP9 signalosome subunit 4 (CSN4). The allele, designated csn4-2035, suppresses the adventitious root (AR) phenotype of the Arabidopsis superroot2-1 mutant, potentially by altering its auxin signaling. Furthermore, we show that although the csn4-2035 mutation affects primary and lateral root (LR) formation in the 2035 suppressor mutant, CSN4 and other subunits of the COP9 complex seem to differentially control AR and LR development.

  • 6.
    Rahneshan, Zahra
    et al.
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Department of Biology, Faculty of Science, Shahid Bahonar University, Kerman 76169-14111, Iran.
    Nasibi, Fatemeh
    Lakehal, Abdellah
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Bellini, Catherine
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Institut National de la Research Agronomic, UMR1318 INRA-AgroParisTech, Institut Jean-Pierre Bourgin, Univ. Paris-Sud, 78000 Versailles, France.
    Unravelling salt stress responses in two pistachio (Pistacia vera L.) genotypes2018In: Acta Physiologiae Plantarum, ISSN 0137-5881, E-ISSN 1861-1664, Vol. 40, no 9, article id 172Article in journal (Refereed)
    Abstract [en]

    Pistachio tree (Pistacia vera L.) is among the tree species that are most tolerant to salinity stress. In the present investigation, we analyzed the behavior of two pistachio genotypes (Badami-e-Zarand (BZ) and Badami-e-Sefid (BS)) under different NaCl concentrations to reveal the mechanisms involved in salinity tolerance. A greater decline in several growth-related traits and biomass as well as relative water content was observed in BS seedlings than in BZ seedlings. Proline content, which is an indicator of stress, increased in both genotypes. Salinity induced oxidative stress in both genotypes, but the levels were higher for the BS genotype. The negative impact of salinity on photosynthetic process in BS was represented by a remarkable decrease in total chlorophyll and carotenoids, while the better performance of the BZ genotype under high salinity was accompanied by an increase in the activities of ascorbate peroxidase, catalase and guaiacol peroxidase. A significant increase in the superoxide dismutase activity in the leaves of BZ was observed under moderate salinity treatment. In both genotypes, Na+ content in leaf and root tissues increased progressively after salinity treatment. However, the leaves of BZ contained less Na+ and retained a lower Na+/K+ ratio. Moreover, under salinity treatment, BZ seedlings had a greater amount of NHX1 transcripts, which suggests that excess Na+ may be sequestered into root vacuoles to avoid deleterious effects of these toxic ions.

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