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Kirova E, Moskova I, Manova V, Koycheva Y, Tsekova Z, Borisova D, Nikolov H, Dimitrov V, Sergiev I, Kocheva K. Exogenous Cytokinin 4PU-30 Modulates the Response of Wheat and Einkorn Seedlings to Ultraviolet B Radiation. PLANTS (BASEL, SWITZERLAND) 2024; 13:1401. [PMID: 38794471 PMCID: PMC11125444 DOI: 10.3390/plants13101401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 05/15/2024] [Accepted: 05/15/2024] [Indexed: 05/26/2024]
Abstract
Abiotic stress is responsible for a significant reduction in crop plant productivity worldwide. Ultraviolet (UV) radiation is a natural component of sunlight and a permanent environmental stimulus. This study investigated the distinct responses of young wheat and einkorn plants to excessive UV-B radiation (180 min at λmax 312 nm) following foliar pretreatment with 1 µM synthetic cytokinin 4PU-30. Results demonstrated that UV radiation significantly amplified hydrogen peroxide levels in both wheat and einkorn, with einkorn exhibiting a more pronounced increase compared to wheat. This elevation indicated the induction of oxidative stress by UV radiation in the two genotypes. Intensified antioxidant enzyme activities and the increased accumulation of typical stress markers and non-enzyme protectants were evidenced. Transcriptional activity of genes encoding the key antioxidant enzymes POX, GST, CAT, and SOD was also investigated to shed some light on their genetic regulation in both wheat and einkorn seedlings. Our results suggested a role for POX1 and POX7 genes in the UV-B tolerance of the two wheat species as well as a cytokinin-stimulated UV-B stress response in einkorn involving the upregulation of the tau subfamily gene GSTU6. Based on all our findings, it could be concluded that 4PU-30 had the potential of alleviating oxidative stress by attenuating the symptoms of superfluous UV-B illumination in the two examined plant species.
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Affiliation(s)
- Elisaveta Kirova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria; (E.K.); (I.M.); (Y.K.); (Z.T.); (I.S.)
| | - Irina Moskova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria; (E.K.); (I.M.); (Y.K.); (Z.T.); (I.S.)
| | - Vasilissa Manova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria; (E.K.); (I.M.); (Y.K.); (Z.T.); (I.S.)
| | - Yana Koycheva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria; (E.K.); (I.M.); (Y.K.); (Z.T.); (I.S.)
| | - Zoia Tsekova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria; (E.K.); (I.M.); (Y.K.); (Z.T.); (I.S.)
| | - Denitsa Borisova
- Space Research and Technology Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 1, 1113 Sofia, Bulgaria; (D.B.); (H.N.); (V.D.)
| | - Hristo Nikolov
- Space Research and Technology Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 1, 1113 Sofia, Bulgaria; (D.B.); (H.N.); (V.D.)
| | - Ventzeslav Dimitrov
- Space Research and Technology Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 1, 1113 Sofia, Bulgaria; (D.B.); (H.N.); (V.D.)
| | - Iskren Sergiev
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria; (E.K.); (I.M.); (Y.K.); (Z.T.); (I.S.)
| | - Konstantina Kocheva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria; (E.K.); (I.M.); (Y.K.); (Z.T.); (I.S.)
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Zhu M, Riederer M, Hildebrandt U. UV-C irradiation compromises conidial germination, formation of appressoria, and induces transcription of three putative photolyase genes in the barley powdery mildew fungus, Blumeria graminis f. sp. hordei. Fungal Biol 2018; 123:218-230. [PMID: 30798877 DOI: 10.1016/j.funbio.2018.12.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 11/22/2018] [Accepted: 12/11/2018] [Indexed: 11/29/2022]
Abstract
UV-C irradiation is known to compromise germination of Blumeria graminis conidia and to reduce powdery mildew infestation. However, only scarce information is available on the effects of UV-C irradiation on B. graminis appressorium formation. Applying a Formvar® resin-based in vitro system allowed for analyzing B. graminis germination and appressorium formation in absence of plant defense. UV-C irradiation more strongly affected the differentiation of appressoria than conidial germination. In vivo and in vitro, a single dose of 100 J m-2 UV-C was sufficient to reduce germination to less than 20 % and decrease appressorium formation to values below 5 %. UV-C irradiation negatively affected pustule size and conidiation. White light-mediated photoreactivation was most effective immediately after UV-C irradiation, indicating that a prolonged phase of darkness after UV-C treatment increases the efficacy of B. graminis control. UV-C irradiation increased transcript levels of three putative B. graminis photolyase genes, while mere white light or blue light irradiation did not contribute to the transcriptional up-regulation. Thus, UV-C irradiation effectively controls B. graminis infestation and proliferation by restricting prepenetration processes. Nevertheless, photoreactivation plays an important role in UV-C-based powdery mildew control in crops and hence has to be considered for planning specific irradiation schedules.
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Affiliation(s)
- Mo Zhu
- University of Würzburg, Julius-von-Sachs-Institute for Biosciences, Chair of Botany II, Julius-von-Sachs-Platz 3, 97082 Würzburg, Germany.
| | - Markus Riederer
- University of Würzburg, Julius-von-Sachs-Institute for Biosciences, Chair of Botany II, Julius-von-Sachs-Platz 3, 97082 Würzburg, Germany.
| | - Ulrich Hildebrandt
- University of Würzburg, Julius-von-Sachs-Institute for Biosciences, Chair of Botany II, Julius-von-Sachs-Platz 3, 97082 Würzburg, Germany.
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