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  • 1.
    Hanson, Johannes
    et al.
    Department of Physiological Botany, Evolutionary Biology Center, University of Uppsala.
    Regan, S.
    Engström, P.
    The expression pattern of the homeobox gene ATHB13 reveals a conservation of transcriptional regulatory mechanisms between Arabidopsis and hybrid aspen2002In: Plant Cell Reports, ISSN 0721-7714, E-ISSN 1432-203X, Vol. 21, no 1, p. 81-89Article in journal (Refereed)
    Abstract [en]

    ATHB13 belongs to a family of homeodomain leucine zipper (HDZip) transcription factors in Arabidopsis thaliana. To understand the temporal and spatial distribution of ATHB13 gene expression, we examined the ATHB13 promoter activity by means of fusions to the uidA (GUS, beta-glucuronidase) reporter gene in transgenic plants. The strongest promoter activity was detected in the vasculature of the basal portion of petioles for both rosette leaves and cotyledons and at the base of cauline leaves. Activity was also detected in the stem at the base of the cauline leaf in an area corresponding to the leaf gap in the vasculature. In flowers, promoter activity was also present in the receptacle and in the stigma. Transformation of the same promoter-GUS construct into hybrid aspen (Populus tremula x P. tremuloides) resulted in an analogous expression pattern in the petioles of leaves. The similarity of these expression patterns indicates that the trans-acting factors responsible for ATHB13 expression are conserved between aspen and Arabidopsis. The conserved expression pattern of the highly specific Arabidopsis ATHB13 promoter in hybrid aspen demonstrates the potential utility of Arabidopsis promoters for tissue-specific expression in angiosperm trees.

  • 2.
    Lehotai, Nóra
    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).
    Feigl, Gábor
    Koós, Ágnes
    Molnár, Árpád
    Ördög, Attila
    Petõ, Andrea
    Erdei, László
    Kolbert, Zsuzsanna
    Nitric oxide-cytokinin interplay influences selenite sensitivity in Arabidopsis2016In: Plant Cell Reports, ISSN 0721-7714, E-ISSN 1432-203X, Vol. 35, no 10, p. 2181-2195Article in journal (Refereed)
    Abstract [en]

    Selenium-induced phytotoxicity is accompanied by developmental alterations such as primary root (PR) shortening. Growth changes are provoked by the modulation of hormone status and signalling. Cytokinin (CK) cooperates with the nitric oxide (NO) in many aspects of plant development; however, their interaction under abiotic stress has not been examined. Selenite inhibited the growth of Arabidopsis seedlings and reduced root meristem size through cell division arrest. The CK-dependent pARR5::GUS activity revealed the intensification of CK signalling in the PR tip, which may be partly responsible for the root meristem shortening. The selenite-induced alterations in the in situ expressions of cytokinin oxidases (AtCKX4::GUS, AtCKX5::GUS) are associated with selenite-triggered changes of CK signalling. In wild-type (WT) and NO-deficient nia1nia2 root, selenite led to the diminution of NO content, but CK overproducer ipt-161 and -deficient 35S:CKX2 roots did not show NO decrease. Exogenous NO (S-nitroso-N-acetyl-DL-penicillamine, SNAP) reduced the pARR5::GFP and pTCS::GFP expressions. Roots of the 35S:CKX and cyr1 plants suffered more severe selenite-triggered viability loss than the WT, while in ipt-161 and gsnor1-3 no obvious viability decrease was observed. Exogenous NO ameliorated viability loss, but benzyladenine intensified it. Based on the results, selenite impacts development by oppositely modifying CK signalling and NO level. In the root system, CK signalling intensifies which possibly contributes to the nitrate reductase-independent NO diminution. A mutually negative CK-NO interplay exists in selenite-exposed roots; however, overproduction of both molecules worsens selenite sensing. Hereby, we suggest novel regulatory interplay and role for NO and CK in abiotic stress signalling.

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