Abstract
Stable and efficient Agrobacterium-mediated transformation of Gladiolus hybridus cv. ‘Advance Red’ was established via a somatic embryogenesis regeneration system in this study. Treatment with N-phenyl-N′-1, 2, 3-thiadiazol-5-ylurea was sufficient to induce embryogenic callus and somatic embryogenesis in G. hybridus ‘Advance Red’. Cormel slices were used as explants and pre-cultured for 5 days prior to selection culture with 9.48 μM hygromycin and 0.52 mM cefotaxime. Treated slices were inoculated with Agrobacterium stain GV3101 harboring a binary vector, pCAMBIA1301, containing the β-glucuronidase (gus) reporter and hygromycin phosphotransferase genes (hpt). 10 min of infection was determined as the optimal time for transformation. Compared with the normal 3-day co-cultivation period, prolonged co-culture for 12 days led to significantly higher transient gus expression rate (50.52 ± 2.83 %). Permanent expression of gus was observed in leaves, roots and whole plantlets. T-DNA insertion was further confirmed using PCR and Southern blot analyses. Our data collectively indicate that extended pre-cultivation and co-cultivation improve transformation efficiency, and the somatic embryogenic regeneration system effectively facilitates the transformation of G. hybridus. This newly developed transformation system may be successfully applied for functional analysis of genes and quality modifications in G. hybridus.
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Abbreviations
- AS:
-
Acetosyringone
- CaMV 35S:
-
Cauliflower mosaic virus 35S promoter
- gus :
-
β-Glucuronidase
- hpt :
-
Hygromycin phosphotransferase
- IBA:
-
Indole-3-butyric acid
- LB:
-
Luria–Bertani
- MES:
-
4-Morpholineethanesulfonic acid hydrate
- MS:
-
Murashige and Skoog
- NOS poly A:
-
Nopaline synthase poly A terminator
- 6-BA:
-
6-Benzylaminopurine
- TDZ:
-
N-phenyl-N′-1, 2, 3-thiadiazol-5-ylurea
- OD600 :
-
Optical density at a wavelength of 600 nm
- PCR:
-
Polymerase chain reaction
- vir :
-
Virulence genes of Agrobacterium tumefaciens
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This work was supported by the Doctoral Fund of Ministry of Education of China (20120008110006) and National Natural Science Foundation of China (31171991).
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11240_2014_639_MOESM1_ESM.tif
Schematic representation of hpt and gus gene expression cassettes in the binary vector, pCAMBIA 1301, used in Gladiolus hybridus transformation. The T-DNA region of the vector contains the hygromycin expression cassette (CaMV 35S: hpt: poly A) and uid gene expression cassette (CaMV 35: gus: nos poly A). CaMV 35S cauliflower mosaic virus 35S promoter; hpt hygromycin phosphotransferase II; poly A cauliflower mosaic virus 35S poly A terminator; gus beta-glucuronidase gene; nos poly A nopaline synthase poly A terminator. The pink bar represents DIG primers and the blue bar indicates PCR primers (TIFF 1851 kb)
11240_2014_639_MOESM2_ESM.tif
Characteristics of explants and effects of hygromycin a Explant; b Callus generated from fibrovascular tissue and adjacent parenchymatous tissue; c Explant and its embryogenic callus; d Section of an explant; e, f, g, h, i Explants cultured in MS + 0, 2.5, 5, 7.5, 15 mg l−1 hygromycin at 30 days, respectively. a, b, c, d bar = 1 mm; e, f, g, h, i bar = 1 cm (TIFF 39445 kb)
11240_2014_639_MOESM3_ESM.tif
A Overall GUS-stained plantlets (no chimeras), bar = 1 cm; b and c Partially stained plantlets (chimeras), bar = 500 μm (TIFF 12200 kb)
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Wu, J., Liu, C., Seng, S. et al. Somatic embryogenesis and Agrobacterium-mediated transformation of Gladiolus hybridus cv. ‘Advance Red’. Plant Cell Tiss Organ Cult 120, 717–728 (2015). https://doi.org/10.1007/s11240-014-0639-5
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DOI: https://doi.org/10.1007/s11240-014-0639-5