Changes in photosynthetic capacity and antioxidant enzymatic systems in micropropagated <Emphasis Type="Italic">Zingiber officinale</Emphasis> plantlets during their acclimation |
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Authors: | Q Z Guan Y H Guo X L Sui W Li Z X Zhang |
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Institution: | (1) College of Agronomy and Biotechnology, China Agriculture University, Beijing, 100094, China |
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Abstract: | Ginger (Zingiber officinale Rosc.) plantlets were propagated in vitro and acclimated under different photosynthetic photon flux densities (60 and 250 μmol m−2 s−1 = LI and HI, respectively). Increases in chlorophyll (Chl) content and Chl a/b ratio were found under both irradiances. In vitro plantlets (day 0) exhibited a low photosynthesis, but chloroplasts from in vitro leaves contained well developed grana and osmiophillic globules. Photoinhibition in leaves formed in vitro was characterized by decrease of photochemical efficiency and quantum efficiency of photosystem 2 photochemistry in HI treatment
during acclimation. The new leaves formed during acclimation in both treatments showed a higher photosynthetic capacity than
the leaves formed in vitro. Also activities of antioxidant enzymes of micropropagated ginger plantlets changed during acclimation. |
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Keywords: | Additional" target="_blank">Additional antioxidative enzymes chlorophyll content and fluorescence chloroplast ultrastructure ginger dry mass net photosynthetic rate photochemical quenching plant height |
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