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The fungal endophyte Epichloë typhina improves photosynthesis efficiency of its host orchard grass ( Dactylis glomerata )

Rozpądek, Piotr ; Wężowicz, K. ; Nosek, M. ; Ważny, R. ; Tokarz, K. ; Lembicz, M. ; Miszalski, Z. ; Turnau, K.

Planta, 2015, Vol.242(4), pp.1025-1035 [Periódico revisado por pares]

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  • Título:
    The fungal endophyte Epichloë typhina improves photosynthesis efficiency of its host orchard grass ( Dactylis glomerata )
  • Autor: Rozpądek, Piotr ; Wężowicz, K. ; Nosek, M. ; Ważny, R. ; Tokarz, K. ; Lembicz, M. ; Miszalski, Z. ; Turnau, K.
  • Assuntos: Endophyte ; Dactylis glomerata ; Epichloë typhina ; Photosynthesis ; NPQ
  • É parte de: Planta, 2015, Vol.242(4), pp.1025-1035
  • Descrição: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1007/s00425-015-2337-x Byline: Piotr RozpAdek (1,2), K. WAA1/4owicz (1), M. Nosek (3), R. WaA1/4ny (4), K. Tokarz (2,5), M. Lembicz (6), Z. Miszalski (4), K. Turnau (1,4) Keywords: Endophyte; Dactylis glomerata; Epichloe typhina; Photosynthesis; NPQ Abstract: Main conclusion According to the results presented in this paper the fungal endophyte Epichloe typhina significantly improves the growth, PSII photochemistry and C assimilation efficiency of its host Dactylis glomerata. In this paper, we present a comprehensive study of the impact of the endophytic fungi Epichloe typhina on its plant hosts' photosynthesis apparatus. Chlorophyll a fluorescence, gas exchange, immuno-blotting and spectrophotometric measurements were employed to assess photosynthetic performance, changes in pigment content and mechanisms associated with light harvesting, carbon assimilation and energy distribution in Dactylis glomerata colonized with Epichloe typhina. According to the results presented in this study, colonization of D. glomerata results in improved photosynthesis efficiency. Additionally, we propose a new mechanism allowing plants to cope with the withdrawal of a significant fraction of its energy resources by the endophytic fungi. The abundance of LHCI, LHCII proteins as well as chlorophyll b was significantly higher in E+ plants. Malate export out of the chloroplast was shown to be increased in colonized plants. To our knowledge, we are the first to report this phenomenon. Epichloe colonization improved PSII photochemistry and C assimilation efficiency. Elevated energy demands of E+ D. glomerata plants are met by increasing the rate of carbon assimilation and PSII photochemistry. Author Affiliation: (1) Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387, Krakow, Poland (2) Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239, Krakow, Poland (3) Institute of Biology, Pedagogical University, Podbrzezie 3, 31-054, Krakow, Poland (4) Malopolska Centre of Biotechnology, Jagiellonian University, Gronostajowa 7a, 30-387, Krakow, Poland (5) Institute of Plant Biology and Biotechnology, University of Agriculture, 29 Listopada 54, 31-425, Krakow, Poland (6) Department of Plant Taxonomy, A. Mickiewicz University, Umultowska 89, 61-614, PoznaA, Poland Article History: Registration Date: 28/05/2015 Received Date: 11/02/2015 Accepted Date: 21/05/2015 Online Date: 10/06/2015 Article note: Electronic supplementary material The online version of this article (doi: 10.1007/s00425-015-2337-x) contains supplementary material, which is available to authorized users.
  • Idioma: Inglês

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