Abstract
AFLP technique was used to analyse the polymorphism between rice cytoplasmic male sterility (CMS) line Jin2A and its maintainer Jin2B. A stable differential band was discovered, and sequence analysis showed that Jin2A contained a more tandem repeat of 6 base pairs (AGAAAA) than Jin2B. Further studies confirmed that the diversity came from cpDNA and occurred at three kinds of abortive cytoplasmic genotypes. Accordingly, specific primers were designed and utilized to assess the purity of rice CMS lines during multiplication with pollen fertility and seed setting rates of bagged panicles as control. The result indicated that this cpDNA locus could be utilized to precisely distinguish maintainer plants from rice CMS lines. PCR analysis was consistent with that from Grow-out test in CMS line seed purity assessment during multiplication, despite it was helpless in distinguishing F1 hybrids from CMS lines due to similar cytoplasms. Because of fewer hybrid and more maintainer off-plants, this cpDNA locus was still appropriate for seed purity assessment of rice CMS line during multiplication. This is first report that a marker on cpDNA could be utilized to assess the genetic purity of rice CMS lines with three abortive cytoplasmic genotypes.
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Acknowledgments
The study is partially funded by the National Natural Sciences Foundation of China (No. 30200173), National “863” molecular breeding of China and the Key Natural Sciences Foundation Project of Chongqing. Undergraduate student Gong Xiaoping performed partial pollen fertility assessment. Authors show great acknowledgments.
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Sang, X., Yang, Z., Zhong, B. et al. Assessment of purity of rice CMS lines using cpDNA marker. Euphytica 152, 177–183 (2006). https://doi.org/10.1007/s10681-006-9196-2
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DOI: https://doi.org/10.1007/s10681-006-9196-2