Tissue Culture and Agrobacterium-Mediated Transformation on Rosa Hybrida L. 'Christian Dior'
Callus induction from leaf explants of Rosa hybrida L. 'Christian Dior' was established. Two types of auxins (2.4-D and NAA) at three concentrations (4.5, 9.0 and 13.5 µM) and two types of cytokinins (kinetin and BA) at three concentrations (2.3, 4.7 and 9.3 µM) were used in a 3 X 4 expe...
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| Format: | Thesis |
| Language: | English English |
| Published: |
1997
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/8626/1/FSAS_1997_11_A.pdf |
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| Summary: | Callus induction from leaf explants of Rosa hybrida L. 'Christian Dior' was
established. Two types of auxins (2.4-D and NAA) at three concentrations (4.5, 9.0 and 13.5 µM) and two types of cytokinins (kinetin and BA) at three concentrations
(2.3, 4.7 and 9.3 µM) were used in a 3 X 4 experimental design. The best
caulogenesis and callus maintenance medium was 112 MS + 30 giL sucrose
+ 9.0 µM NAA + 2.3 µM BA cultured in the dark. Several attempts were carried
out to induce shoot organogenesis and/or somatic embryogenesis from callus. None
of the media tested induced shoots or somatic embryos. However, there were
differences observed for callus growth on the medium tested. Combination of
cytokinins (BA and TDZ) at 5.0-10.0 µM with auxins (NAA and IBA) at 1.0-2.0 µM, generally promoted callus proliferation. Callus cultured on cytokinin onlyAmino acids proline and glutamine also enhanced callus proliferation.
Observations under the stereo microscope revealed that the callus was globular.
Medium without ammonium ion enhanced callus proliferation. TDZ was found to
be the better cytokinin for callus proliferation. Observation of cells taken from
callus cultured on the various media revealed that there was no meristematic
primordias .
Agrobacterium-mediated transformation of R. hybrida L . 'Christian Dior'
callus produced three transgenic callus lines that were confirmed by dot blot and
Southern hybridisation assays. Leaf-derived callus was transformed with
Agrobacterium tumefaciens LBA4404 carrying plasmid pBI 121 which contained the
B-glucuronidase (GUS) gene and nptII gene coding for kanamycin resistance. The
best condition for infection of callus tissues with A. tumefaciens was exposure to
1 X 1 09 cells/ml for 5 minutes. At this condition, GUS activity was found to be the
highest (6.39 ± 0.01 pmol MU/h/p.g protein). It was also found that at low
Agrobacterium concentration, increasing the exposure period increased GUS
transient activity, and at high Agrobacterium concentration, increasing exposure
period reduced GUS transient activity . Transformation efficiency improved when
callus was cultured for 2 weeks on medium without kanamycin (but with 500 p.g/ml
carbenicill in) before transferring the callus to medium with 300 p.g/ml kanamycin + 500 p.g/ml carbenicillin for selection. Carbenicillin served to eliminate
Agrobaterium. Kanamycin was also found to be unsuitable for used as a selective
marker. |
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