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Culture and fusion of pollen protoplasts of Brassica oleracea L. var. italica with haploid mesophyll protoplasts of B. rapa L. ssp. pekinensis

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Summary.

Hybrid callus was formed from the successful protoplast fusion between pollen protoplasts of Brassica oleracea var. italica and haploid mesophyll protoplasts of Brassica rapa. The pollen protoplast isolation frequency in broccoli was highly related to the ratio of trinucleate pollens in the male gametophyte population. Large quantities of pollen protoplasts with high vigor could be isolated, and the isolation frequency reached up to 90% in 6.0–7.0 mm long flower buds with about 94.7% trinucleate-stage pollens. Pollen protoplasts could be collected and purified by discontinuous gradient centrifugation. In 1% Na-alginate embedding culture, cell divisions were observed but no further development was found. The haploid mesophyll protoplasts were isolated from in vitro haploid plants of B. rapa. Results strongly showed the variability in culturability of mesophyll protoplasts from different haploid lines. Both pollen protoplasts and haploid mesophyll protoplasts retained a stable round shape in the designed prefusion solution with an osmotic pressure of 0.74 osmol/kg. Polyethylene glycol was used for the protoplast fusion, and 40% polyethylene glycol 4000 enabled the highest fusion frequency of about 20%. Some postfusion protoplasts showed cell divisions up to callus proliferation. Calli were screened by random amplified polymorphic DNA analysis for their hybrid character. Results revealed the existence of the hybrid calli. Some of the hybrid calli grew well with green color and shoot primordia. According to our knowledge, this is the first report about a hybrid formation between two haploid protoplasts. Potential comprehensive applications, as well as problems of this technique, are discussed.

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Abbreviations

DAPI:

4′,6-diamidino-2-phenylindole

FDA:

fluorescein diacetate

PEG:

polyethylene glycol

RAPD:

random amplified polymorphic DNA

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Authors and Affiliations

  1. Institute of Horticultural Crops, Federal Centre for Breeding Research on Cultivated Plants, Quedlinburg

    Fan Liu, U. Ryschka, F. Marthe, E. Klocke & G. Schumann

  2. Beijing Vegetable Research Center, Beijing

    Fan Liu & H. Zhao

Authors
  1. Fan Liu
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  2. U. Ryschka
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  3. F. Marthe
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  4. E. Klocke
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  5. G. Schumann
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  6. H. Zhao
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Corresponding author

Correspondence to E. Klocke.

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Correspondence and reprints: Institute of Horticultural Crops, Federal Centre for Breeding Research on Cultivated Plants, Erwin-Baur-Strasse 27, 06484 Quedlinburg, Federal Republic of Germany.

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Liu, F., Ryschka, U., Marthe, F. et al. Culture and fusion of pollen protoplasts of Brassica oleracea L. var. italica with haploid mesophyll protoplasts of B. rapa L. ssp. pekinensis . Protoplasma 231, 89–97 (2007). https://doi.org/10.1007/s00709-006-0228-5

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  • DOI: https://doi.org/10.1007/s00709-006-0228-5

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