Abstract
Modern sugarcane cultivars are derived from the hybridization of Saccharum officinarum (2n = 80) and S. spontaneum (2n = 40–128), leading to a variety of complex genomes with highly polyploid and varied chromosome structures. These complex genomes have hindered deciphering the genome structure and marker-assisted selection in sugarcane breeding. Ten cultivars were analyzed by fluorescence in situ hybridization adopting chromosome painting and S. spontaneum–specific probes. The results showed six types of chromosomes in the studied cultivars, including S. spontaneum or S. officinarum chromosomes, interspecific recombinations from homoeologous or nonhomoeologous chromosomes, and translocations of S. spontaneum or S. officinarum chromosomes. The results showed unexpectedly high proportions of interspecific recombinations in these cultivars (11.9–40.9%), which renew our knowledge that less than 13% of chromosomes result from interspecific exchanges. Also, the results showed a high frequency of translocations (an average of 2.15 translocations per chromosome) between S. officinarum chromosomes. The diverse types of chromosomes in cultivars imply that hybrid gametes of S. spontaneum and S. officinarum may form unusual chromosome pairs, including homoeologous or nonhomoeologous chromosomes either between or within S. spontaneum and S. officinarum. Moreover, we consistently observed 11 or 12 copies for the four studied chromosomes, i.e., chromosomes 1, 2, 7, and 8, suggesting steady transmission during the breeding program. By comparison, we found a relatively fewer copies of S. spontaneum chromosome 1 than those of S. spontaneum chromosomes 2, 7, and 8. These results provide deep insights into the structure of cultivars and may facilitate chromosome-assisted selection in sugarcane breeding.
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07 April 2022
A Correction to this paper has been published: https://doi.org/10.1007/s10577-022-09690-9
Abbreviations
- DAPI:
-
4ʹ,6ʹ-Diamidino-phenylindole
- FISH:
-
Fluorescence in situ hybridization
- Mb:
-
Megabase
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Acknowledgements
We would like to thank the National Field Genebank of Sugarcane Germplasm of China and National Infrastructure for Crop Germplasm Resources--Sugarcane platform of China for supplying us the S. spontaneum plants. We thank Zhuang Meng for the design of oligos and technical assistance in cytogenetic assay.
Funding
This work was supported by the National Natural Science Foundation of China (31771862), the Startup Foundation from Nantong University (03083074), Science and Technology Innovation Fund of Fujian Agricultural and Forestry University (CXZX2020001A), the Research Program of Guangxi Key Laboratory for Sugarcane Biology (GXKLSCB-20190203), and State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources (SKLCUSA-b201808).
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KW and BW designed the research and drafted the manuscript. JL, YZ, and HC collected and grew the plants. HC and JH conducted the experiments. KW, BW, AE, JL, and YZ participated in the data analysis and manuscript preparation.
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Wang, K., Cheng, H., Han, J. et al. A comprehensive molecular cytogenetic analysis of the genome architecture in modern sugarcane cultivars. Chromosome Res 30, 29–41 (2022). https://doi.org/10.1007/s10577-021-09680-3
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DOI: https://doi.org/10.1007/s10577-021-09680-3