4. Discussion
In this study, binary plasmids pBC-hygro-GFP were transformed into F. oxysporumby the PEG-mediated transformation technique and E. coli-mediated methods succeeded in F.
oxysporum B-resistant transformants.
In the F.oxysporum transformation, the size of prepared protoplast is very important for protoplast transformation, too big or too small cannot reach the transformation requirements.1.2·108 spore/ml is the optimal concentration. The fluorescence expression of transformants, the GFP expression was not detectable in any of the hygromycin resistant pBC-hygro-GFP transformants, despite GFP DNA has been ampli-
fied by PCR. Fluorescence expression in different transformants is inconsistent. With is introducing the exogenous gene GFP, this difference may be due to the GFP insert, and
insert the copy number. In this experiment, it was observed that GFP marked transformants of F. oxysporumline had a very weak fluorescence expression. The conidiums without significant expression was outotheca isolated to detect the fluorescence expression of col- ony growing out of a single conidium. It was discovered that the hyphae of colony grown out of cultured conidium without significant fluorescence expression were able to express fluorescence normally, which was deduced that the weak fluorescence expression of conidium was caused by the small number of protoplasm, as little GFP protein was expressed. What could be known from the literature was that after marking fungus with GFP, there was a difference in GFP for conidium of different fungi. Some might have significant green fluorescence expression such as the conidium of Pyreno Phora triticirepentis and Cochliobolus Sativus(Prayitno et al., 1999). The difference might be due to the different protoplasm and protein contents in the conidium of different fungi, for only the protoplast of higher content and water could enable the stimulated blue light to pass through the conidium easily to get GFP protein of inner expression stimulated. We have also used successful GFP expression in F. oxysporumto extend the range of available promoters for use in fungus transformation, and in doing so we have shown that the gfp gene can express stably in the F.oxysporumstrain. The vector we have developed will facilitate
4. Discussion
In this study, binary plasmids pBC-hygro-GFP were transformed into F. oxysporumby the PEG-mediated transformation technique and E. coli-mediated methods succeeded in F.
oxysporum B-resistant transformants.
In the F.oxysporum transformation, the size of prepared protoplast is very important for protoplast transformation, too big or too small cannot reach the transformation requirements.1.2·108 spore/ml is the optimal concentration. The fluorescence expression of transformants, the GFP expression was not detectable in any of the hygromycin resistant pBC-hygro-GFP transformants, despite GFP DNA has been ampli-
fied by PCR. Fluorescence expression in different transformants is inconsistent. With is introducing the exogenous gene GFP, this difference may be due to the GFP insert, and
insert the copy number. In this experiment, it was observed that GFP marked transformants of F. oxysporumline had a very weak fluorescence expression. The conidiums without significant expression was outotheca isolated to detect the fluorescence expression of col- ony growing out of a single conidium. It was discovered that the hyphae of colony grown out of cultured conidium without significant fluorescence expression were able to express fluorescence normally, which was deduced that the weak fluorescence expression of conidium was caused by the small number of protoplasm, as little GFP protein was expressed. What could be known from the literature was that after marking fungus with GFP, there was a difference in GFP for conidium of different fungi. Some might have significant green fluorescence expression such as the conidium of Pyreno Phora triticirepentis and Cochliobolus Sativus(Prayitno et al., 1999). The difference might be due to the different protoplasm and protein contents in the conidium of different fungi, for only the protoplast of higher content and water could enable the stimulated blue light to pass through the conidium easily to get GFP protein of inner expression stimulated. We have also used successful GFP expression in F. oxysporumto extend the range of available promoters for use in fungus transformation, and in doing so we have shown that the gfp gene can express stably in the F.oxysporumstrain. The vector we have developed will facilitate
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