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Fine mapping of the novel male-sterile mutant gene ms39 in maize originated from outer space flight

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Abstract

A novel male-sterile maize mutant male sterility 39 (ms39) was obtained from offspring of the commercial hybrid Chuandan No. 9 that had been carried into outer space. A previous study demonstrated that ms39 is controlled by a single recessive nuclear gene, located on the long arm of chromosome 3. Here, we used 1073 mutant individuals derived from the (ms39 × Mo17) F2 population and sequentially developed new primers to identify markers supporting the fine mapping of ms39. A 365-kb region on chromosome 3 flanked by markers L8 and M30 at a genetic distance of 0.18 and 0.47 cM, respectively, was identified. According to the reference sequence of ZmB73_Ref-Gen_v4, 12 candidate genes were identified within the 365-kb mapping region. Based on cloning and sequence BLAST analysis of the 12 candidate genes, a four-base-pair deletion was found within the exon of Zm00001d043909, which encoded callose synthase12. This four-base-pair deletion resulted in a frameshift mutation in ms39, leading to the earlier termination of the coding protein, and ultimately caused abnormal performance of the callose synthase. Additionally, cytological observation was conducted on a sister cross population (ms39/ms39 × ms39/Ms39). These observations showed that the tapetum cells of the ms39 mutant appeared abnormal from the dyad stage, and aborted microspores were observed during pollen development. These results lay the foundation for the cloning of ms39 and exploration of the molecular mechanism underlying aborted pollen development in ms39 maize.

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Funding

This work was supported by the National Natural Science Foundation of China (31771876), the National Key Research and Development Program of China (2016YFD0102104), and the Platform for Mutation Breeding by Radiation in Sichuan (2016NZ0106).

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Correspondence to Moju Cao.

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The authors declare that they have no competing interests.

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Fig. S1

Flow chart of the development of three populations. The (ms39 × Mo17) F2 population was developed for fine mapping, (ms39 × Mo17) BC1F2 and the (ms39 × B73) F2 populations was developed for verifying the fine mapping results. A sister cross population was developed for cytological observations. F1 and backcross F1 were planted in winter in Xishuangbanna, Yunnan Province; F2 and backcross F2 were grown in the summer in Chengdu, Sichuan Province; sister cross population was planted in the summer in Sichuan and in the winter in Yunnan over the course one year. (PDF 172 kb)

Fig. S2

Comparison of agronomic traits between the ms39 mutant and wild-type. (a) Plant height. (b) Ear height. (c) Tassel length. (d) Branch number. * Represents significance at 0.05 level. (PDF 94 kb)

Fig. S3

Schematic representation of ZmCals12 and ZmNAC82 gene structure. (a) The exon (solid black box) and untranslated region (UTR; empty box) of ZmCals12; four nucleotides in the first exon was deleted in ms39. (b) The exon (solid black box), intron (black lines) and untranslated region (UTR; empty box) of ZmNAC82; three nucleotides in the first exon and six nucleotides in the third exon were deleted in ms39. (PDF 317 kb)

Fig. S4

Application of the InDel-cals marker for analysis of the 321 mutants from (ms39 × Mo17) BC4F2 population. Mo17, inbred line; S, ms39 mutant; A, male-sterile genotype; B, male-fertile genotype. (PDF 188 kb)

Fig. S5

Expression pattern of candidate genes in different developmental stages of tissues. Colors indicate the individual genes. (PDF 253 kb)

Fig. S6

Phylogenetic analysis of Zmcals12 and its homologous proteins. The evolutionary analyses were conducted in MEGA7. Group A includes eight proteins from monocots, and group B contains four proteins from dicots. (PDF 195 kb)

Fig. S7

Predicted protein structure of callose synthase. (a), (b), (c), (d) are the Zmcals12 from ms39, ZmCals12 from the fertile group, and Cals11 and Cals12 from Arabidopsis, respectively. (PDF 494 kb)

Table S1

All populations used in this study. (DOCX 14 kb)

Table S2

Information of all primers used for mapping in this experiment. (XLSX 28 kb)

Table S3

Information of polymorphic markers used for fine mapping between the ms39 mutant and male-fertile plants. (DOCX 14 kb)

Table S4

Fertility segregation patterns of the F2 and sister cross populations. (DOCX 14 kb)

Table S5

The (ms39 × B73) F2 population was detected by L7, L8, M30, L30, L33 markers. A, male sterile genotype; B, male fertile genotype; H, Heterozygous genotype. χ2 value of the genotype of the (ms39 × B73) F2 population is for χ2 1:2:1, the value is smaller than 5.99; χ2 value of the (ms39 × B73) F2 population is for χ2 3:1, the value is smaller than 3.84. (DOCX 17 kb)

Table S6

Recombination in the (ms39 × Mo17) BC1F2 population by using L7, L8, M30, L30, L33 markers. A, male-sterile genotype; B, male-fertile genotype; H, Heterozygous genotype (DOCX 14 kb)

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Zhu, Y., Shi, Z., Li, S. et al. Fine mapping of the novel male-sterile mutant gene ms39 in maize originated from outer space flight. Mol Breeding 38, 125 (2018). https://doi.org/10.1007/s11032-018-0878-y

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  • DOI: https://doi.org/10.1007/s11032-018-0878-y

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