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  • 1. HOFSLAGARE, O
    et al.
    Samuelsson, Göran
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).
    HALLGREN, JE
    PEJRYD, C
    SJOBERG, S
    A COMPARISON BETWEEN 3 METHODS OF MEASURING PHOTOSYNTHETIC UPTAKE OF INORGANIC CARBON IN ALGAE1985Inngår i: Photosynthetica (Praha), ISSN 0300-3604, E-ISSN 1573-9058, Vol. 19, nr 4, s. 578-585Artikkel i tidsskrift (Fagfellevurdert)
  • 2. Nonomura, Arthur M.
    et al.
    Shevela, Dmitry
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen. ShevelaDesign AB, Umeå, Sweden.
    Komath, Sneha Sudha
    Biel, Karl Y.
    Govindjee, Govindjee
    The carbon reactions of photosynthesis: role of lectins and glycoregulation2020Inngår i: Photosynthetica (Praha), ISSN 0300-3604, E-ISSN 1573-9058, Vol. 58, nr 5, s. 1090-1097Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Modulation of glycoregulation in agriculture is reviewed here with emphasis on the elucidation of previously unknown pathways involving vacuolar lectins as well as a bypass of lectins that direct free sugars toward productivity. The reversible binding sequences of the endogenous lectin cycle are compared to an induced lectin bypass, as follows. (1) In the cycle, carbohydrate ligands, with similar binding specificities that compete for binding sites on lectins, are involved in the natural cycle of sugar exchanges. (2) For the bypass, tightly bound ligands that occupy lectins prevent free sugars from binding, making them available for productivity. This bypass is induced by methyl-α-D-mannopyranoside, a biochemical plant growth regulator for photosynthesis. Integration of this novel technology, with structural elements crucial for ligand binding by the lectins and with nitrogen assimilation, provides the basis for successful modulation of glycoregulation in crops for enhancement of quality and quantity.

    Fulltekst (pdf)
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  • 3. Novriyanti, E.
    et al.
    Watanabe, M.
    Makoto, Kobayashi
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Takeda, T.
    Hashidoko, Y.
    Koike, T.
    Photosynthetic nitrogen- and water-use efficiency of acacia and eucalypt seedlings as afforestation species2012Inngår i: Photosynthetica (Praha), ISSN 0300-3604, E-ISSN 1573-9058, Vol. 50, nr 2, s. 273-281Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The ecophysiological traits of acacia and eucalypt are important in assessing their suitability for afforestation. We measured the gas-exchange rate, the leaf dry mass per area (LMA) and the leaf nitrogen content of two acacia and four eucalypt species. Relative to the eucalypts, the acacias had lower leaf net photosynthetic rate (P-N), lower photosynthetic nitrogen-use efficiency (PNUE), higher water-use efficiency (WUE), higher LMA and higher leaf nitrogen per unit area (N-area). No clear differences were observed within or between genera in the maximum rate of carboxylation (V-cmax) or the maximum rate of electron transport (J(max)), although these parameters tended to be higher in eucalypts. PNUE and LMA were negatively correlated. We conclude that acacias with higher LMA do not allocate nitrogen efficiently to photosynthetic system, explaining why their P-N and PNUE were lower than in eucalypts.

  • 4. Tikhonov, K.
    et al.
    Shevela, Dmitry
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
    Klimov, V. V.
    Messinger, Johannes
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen. Department of Chemistry, Molecular Biomimetics, Ångström Laboratory, Uppsala University, Uppsala, Sweden.
    Quantification of bound bicarbonate in photosystem II2018Inngår i: Photosynthetica (Praha), ISSN 0300-3604, E-ISSN 1573-9058, Vol. 56, nr 1, s. 210-216Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study, we presented a new approach for quantification of bicarbonate (HCO3-) molecules bound to PSII. Our method, which is based on a combination of membrane-inlet mass spectrometry (MIMS) and O-18-labelling, excludes the possibility of "non-accounted" HCO3- by avoiding (1) the employment of formate for removal of HCO3- from PSII, and (2) the extremely low concentrations of HCO3-/CO2 during online MIMS measurements. By equilibration of PSII sample to ambient CO2 concentration of dissolved CO2/HCO3-, the method ensures that all physiological binding sites are saturated before analysis. With this approach, we determined that in spinach PSII membrane fragments 1.1 +/- 0.1 HCO3- are bound per PSII reaction center, while none was bound to isolated PsbO protein. Our present results confirmed that PSII binds one HCO3- molecule as ligand to the non-heme iron of PSII, while unbound HCO3- optimizes the water-splitting reactions by acting as a mobile proton shuttle.

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