Abstract
In this study, the background activity of β-glucuronidase (GUS) was analyzed histochemically and fluorometrically in the negative control of Laminaria japonica (Phaeophyta) thalli, showing low level of activity. GUS gene transformation without selectable gene in L. japonica was performed using four different promoters, i.e., Cauliflower mosaic virus 35S promoter (CaMV35S) from cauliflower mosaic virus, ubiquitin promoter (UBI) from maize, adenine-methyl transfer enzyme gene promoter (AMT) from virus in green alga Chlorella, and fucoxanthin chlorophyll a/c-binding protein gene promoter (FCP) from diatom Phaeodactylum tricornutum. The GUS transient activity was determined fluorometrically after bombarding sliced parthenogenetic sporophytes explants, and it was found that the activity resulting from CaMV35S and FCP promoters (in 114.3 and 80.6 pmol MU min−1 (mg protein)−1, respectively) was higher than for the other two promoters. The female gametophytes were bombarded and regenerated parthenogenetic sporophytes. FCP was the only promoter that resulted in detectable GUS chimeric expression activity during histochemical staining and polymerase chain reaction. Results of Southern blot showed that GUS gene was integrated with the L. japonica genome.
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This work was supported by the Key Innovative Project of Chinese Academy of Science (KZCX2-YW-209) and the CAS/SAFEA International Partnership Program for Creative Research Teams (Research and Applications of Marine Functional Genomics).
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Li, F., Qin, S., Jiang, P. et al. The integrative expression of GUS gene driven by FCP promoter in the seaweed Laminaria japonica (Phaeophyta). J Appl Phycol 21, 287–293 (2009). https://doi.org/10.1007/s10811-008-9366-9
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DOI: https://doi.org/10.1007/s10811-008-9366-9