Unlabelled: Honglian (HL)-type cytoplasmic male sterility (CMS) has only been used in the development of three-line rice hybrids, and the fertility of HL-type CMS lines can be restored by two non-allelic fertility-restorer () genes, and . For the development of HL-type hybrid combinations, it is therefore necessary to determine whether and can restore the fertility of HL-type CMS lines. Here, we genetically characterized HL-type CMS lines and the ability of and to restore fertility for breeding HL-type hybrids. I-KI pollen staining revealed that HL-type CMS lines and their derived testcross F hybrids had stained abortive pollen grains, unlike HL-type CMS lines. Crossing experiments showed that and partially restored the fertility of HL-type CMS lines, and showed higher restorability than Furthermore, we found that there were additive and dosage effects of and with respect to fertility restoration in HL-type CMS lines. These results give critical insight into the breeding of HL-type CMS lines and restorers, which will be helpful for the development of commercial HL-type hybrids.
Supplementary Information: The online version contains supplementary material available at 10.1007/s11032-021-01256-7.
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| http://dx.doi.org/10.1007/s11032-021-01256-7 | DOI Listing |
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