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2012 | 34 | 5 |

Tytuł artykułu

In vitro conditions affect photosynthetic performance and crassulacean acid metabolism in Mammillaria gracilis Pfeiff. tissues

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
Mammillaria gracilis Pfeiff. plants cultivated in the pot (pot plants, PP), as well as in vitro-grown normal shoots (NS), habituated callus (HC), hyperhydric shoots (HS), and tumour tissue (TT) were investigated in order to reveal the influence of in vitro culture on functionality of the photosynthetic apparatus and CAM photosynthesis in cactus M. gracilis Pfeiff. Photosynthetic pigments content as well as maximum (Fv/Fm) and effective (ΦPSII) quantum yield of photosystem II (PSII) decreased in all in vitrogrown tissues in comparison to PP. The decrease observed in hyperhydric HC, HS and TT correlated with a low expression of Rubisco large subunit (RbcL) and b subunit of ATP synthase (b ATP synt) and almost undetectable levels of protein D1, light-harvesting chlorophyll a/bbinding protein (LHCII) and cytochrome f protein of thylakoid Cyt b₆/f-complex (Cyt f) found in these tissues. As for crassulacean acid metabolism (CAM) pattern, PP and NS expressed diurnal acid fluctuation, while HC, HS and TT failed to show it. Nevertheless, all M. gracilis tissues exhibited diurnal changes of phosphoenolpyruvate carboxylase (PEPC) activity indicating the typical CAM physiology. In conclusion, the photosynthesis was downregulated in all in vitro-grown tissues. NS maintained typical CAM photosynthesis, while HC, HS and TT withheld PEPC activity, but not acid accumulation specific for CAM. Minor changes observed in NS in comparison to PP could be attributed to the sugar supplementation while the more prominent deviations found in HC, HS and TT could be correlated with hyperhydricity and the loss of characteristic tissue organisation pattern.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

34

Numer

5

Opis fizyczny

p.1883-1893,fig.,ref.

Twórcy

autor
  • Division of Biology, Department of Molecular Biology, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia
autor
  • Division of Biology, Department of Botany, Faculty of Science, University of Zagreb, Rooseveltov trg 6, HR-10000 Zagreb, Croatia
  • Division of Biology, Department of Molecular Biology, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia
  • Division of Biology, Department of Botany, Faculty of Science, University of Zagreb, Rooseveltov trg 6, HR-10000 Zagreb, Croatia
  • Division of Biology, Department of Molecular Biology, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia

Bibliografia

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