Abstract
Interspecific somatic hybrids between the dihaploid Solanum tuberosum and the wild species S. pinnatisectum Dun. were produced via protoplast fusion. Protoplast isolation, electrofusion, culture of post-fusion products and regeneration of calli/shoots were undertaken following optimized protocols. Regenerants were characterized for hybridity, ploidy and resistance to Phytophthora infestans (Mont.) de Bery, causal fungal pathogen of late blight disease. From a total of 126 regenerated macrocalli, 12 somatic hybrids were confirmed by possessing species-specific diagnostic bands of their corresponding parents as revealed by RAPD, SSRs and cytoplasmic-DNA analyses. Tetraploid status of the 12 hybrids was determined using flow cytometry analysis. Intermediate phenotypes for leaf, flower, and tuber characteristics and high male fertility were observed in field-grown hybrid plants. Hybrids were highly resistant to foliage late blight based on field assessment for two seasons. In contrast, moderate level of resistance to foliage blight was observed in hybrids based on the detached leaf assay under laboratory conditions. Overall, somatic hybrids with moderate levels of resistance to foliage blight were identified, and these will be useful for in situ hybridization in potato breeding efforts.
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Abbreviations
- AUDPC:
-
Area under the disease progress curve
- CRBC:
-
Chicken red blood cell
- CTAB:
-
Cetyltrimethylammonium bromide
- DAP:
-
Days after planting
- nDNA:
-
Nuclear DNA
- EBN:
-
Endosperm balance number
- FC:
-
Flow cytometry
- HEPES:
-
4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid
- MS:
-
Murashige and Skoog
- MAS:
-
Marker assisted selection
- PDS:
-
Protoplast digestion solution
- RAPD:
-
Random amplified polymorphic DNA
- RAUDPC:
-
Relative area under the disease progress curve
- RCBD:
-
Randomized complete block design
- SSR:
-
Simple sequence repeat
- TPS:
-
True potato seed
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Acknowledgments
Authors are grateful to Dr. PS Ahuja, Director, Institute of Himalayan Bioresource and Technology (IHBT), Palampur, Himachal Pradesh, India for the facility provided for flow cytometry analysis. Authors thank to Mr. Sheeshram Thakur for the in vitro multiplication and field management. The financial assistance received in the form of an ad-hoc research project (F. No. 8-45/2004-Hort. II) from the Indian Council of Agricultural Research (ICAR), New Delhi is also acknowledged. Useful comments and suggestions on the manuscript from the editor, associate editor and two anonymous reviewers are gratefully acknowledged.
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Sarkar, D., Tiwari, J.K., Sharma, S. et al. Production and characterization of somatic hybrids between Solanum tuberosum L. and S. pinnatisectum Dun.. Plant Cell Tiss Organ Cult 107, 427–440 (2011). https://doi.org/10.1007/s11240-011-9993-8
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DOI: https://doi.org/10.1007/s11240-011-9993-8