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High spontaneous male-fertility-restorer frequency in a maize recurrent selection experiment
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High spontaneous male-fertility-restorer frequency in a maize recurrent selection experiment
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High spontaneous male-fertility-restorer frequency in a maize recurrent selection experiment
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Journal Article
High spontaneous male-fertility-restorer frequency in a maize recurrent selection experiment
2020
Overview
Using the crosses of the DH lines derived from a single cross hybrid Xianyu 335 as source materials for haploid induction in the recurrent selection scheme, we found that the rate of spontaneous chromosome doubling in the tassels of the haploid plants increased significantly in the second cycle and showed a cumulative genetic effect, and through using DH recurrent selection technique, the doubling rate of the haploid tassels can be doubled. Proved performing continuous recurrent selection in a narrow single cross background, the genetic makeup of the haploids had been enriched for spontaneous doubling restoration. Using hybrids between DH lines from two cycles haploid selection as source materials for haploid induction, the haploid tassel doubling rate had reached 85.15% and haploid ears showed seed set had reached 66.18%, representing a rate increase of 6.99 folds and 9.86 folds of its original source population Xianyu335.The genetic gain of set seeds plant frequency is 29.74% per cycle. Also, because the DH lines had been selected from two cycles of haploids or whole genome gamete selection based on the haploid phenotypes, it was effectively eliminated many deleterious and bad genes, and also cumulatively combined many superior genes for agronomy and plant growth vigor. These new DHs can be directly used as parents for germplasm enhancement and new hybrid selection and breeding. The discovery of the enrichment for spontaneous chromosome doubling and fertility restoration in of the tassels of the haploid plants tassels that were derived from DH recurrent selection technique and create high spontaneous doubling rate source materials may have showed a significant application value in maize breeding. It shows significant advantages for construct maize two cycle. Recurrent selection with high haploid spontaneous doubling rate can to speed up breeding output and cumulative genetic improvements.
