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Lehotai, Nora
Alternative names
Publications (3 of 3) Show all publications
Lehotai, N., Feigl, G., Koós, Á., Molnár, Á., Ördög, A., Petõ, A., . . . Kolbert, Z. (2016). Nitric oxide-cytokinin interplay influences selenite sensitivity in Arabidopsis. Plant Cell Reports, 35(10), 2181-2195
Open this publication in new window or tab >>Nitric oxide-cytokinin interplay influences selenite sensitivity in Arabidopsis
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2016 (English)In: Plant Cell Reports, ISSN 0721-7714, E-ISSN 1432-203X, Vol. 35, no 10, p. 2181-2195Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Springer, 2016
Cytokinin, Nitric oxide, Root growth, Selenite
National Category
Botany Genetics
urn:nbn:se:umu:diva-127234 (URN)10.1007/s00299-016-2028-5 (DOI)000383708500014 ()27449496 (PubMedID)
Available from: 2016-11-15 Created: 2016-11-03 Last updated: 2018-06-09Bibliographically approved
Bourque, S., Jeandroz, S., Grandperret, V., Lehotai, N., Aime, S., Soltis, D. E., . . . Nicolas-Frances, V. (2016). The Evolution of HD2 Proteins in Green Plants. Trends in Plant Science, 21(12), 1008-1016
Open this publication in new window or tab >>The Evolution of HD2 Proteins in Green Plants
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2016 (English)In: Trends in Plant Science, ISSN 1360-1385, E-ISSN 1878-4372, Vol. 21, no 12, p. 1008-1016Article, review/survey (Refereed) Published
Abstract [en]

In eukaryotes, protein deacetylation is carried out by two well-conserved his tone deacetylase (HDAC) families: RPD3/HDA1 and SIR2. Intriguingly, model plants such as Arabidopsis express an additional plant-specific HDAC family, termed type-2 HDACs (HD2s). Transcriptomic analyses from more than 1300 green plants generated by the 1000 plants (1KP) consortium showed that HD2s appeared early in green plant evolution, the first members being detected in several streptophyte green alga. The HD2 family has expanded via several rounds of successive duplication; members are expressed in all major green plant clades. Interestingly, angiosperm species express new HD2 genes devoid of a zinc-finger domain, one of the main structural features of HD2s. These variants may have been associated with the origin and/or the biology of the ovule/seed.

National Category
Evolutionary Biology
urn:nbn:se:umu:diva-129682 (URN)10.1016/j.tplants.2016.10.001 (DOI)000389098000006 ()
Available from: 2017-01-12 Created: 2017-01-09 Last updated: 2018-06-09Bibliographically approved
Kolbert, Z., Lehotai, N., Molnar, A. & Feigl, G. (2016). "The roots" of selenium toxicity: A new concept. Plant Signalling & Behavior, 11(10), Article ID e1241935.
Open this publication in new window or tab >>"The roots" of selenium toxicity: A new concept
2016 (English)In: Plant Signalling & Behavior, ISSN 1559-2316, E-ISSN 1559-2324, Vol. 11, no 10, article id e1241935Article in journal (Refereed) Published
Abstract [en]

Elevated levels of selenium (Se) cause toxicity in non-accumulator plant species. The primary reasons for toxic Se effect have been considered to be selenoprotein accumulation and oxidative stress. However, based on our recent paper in Plant Cell Reports and previous literature data we suggest that disturbances in the homeostasis of both reactive oxygen and nitrogen species result in selenium-induced nitro-oxidative stress, contributing to toxicity. The most characteristic symptom of Se exposure is the inhibited root elongation which is partly caused by hormonal disturbances. Our recent paper suggests the involvement of cytokinin in selenium stress sensing of the root systemAltogether, the aim of this Addendum is to present reactive nitrogen species and phytohormones as new players in plant selenium toxicity.

Cytokinin, nitric oxide, phytohormones, reactive nitrogen species, selenium, toxicity
National Category
urn:nbn:se:umu:diva-131680 (URN)10.1080/15592324.2016.1241935 (DOI)000392379900002 ()
Available from: 2017-02-20 Created: 2017-02-20 Last updated: 2018-06-09Bibliographically approved

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