Abstract
Diverse haploid inducer lines with > 6% of haploid induction rate are now routinely used to develop doubled haploid lines. Though MTL gene regulates haploid induction, its molecular characterization and haplotype analysis in maize and its related species have not been undertaken so far. In the present study, the entire 1812 bp long MTL gene was sequenced among two mutant and eight wild-type inbreds. A 4 bp insertion differentiated the mutant from the wild-type allele. Sequence analysis further revealed 103 polymorphic sites including 38 InDels and 65 SNPs. A total of 15 conserved regions were detected, of which exon-4 was the most conserved. Ten gene-based markers specific to MTL revealed the presence of 40 haplotypes among diverse 48 inbreds of exotic and indigenous origin. It generated 20 alleles with an average of two alleles per locus. The mean polymorphic information content was 0.3247 with mean gene diversity of 0.4135. A total of 15 paralogous sequences of MTL were detected in maize genome with 3–7 exons. Maize MTL proteins of both wild-type and mutant were non-polar in nature, and they possessed four domains. R1-nj-based haploid inducer (HI) lines viz., Pusa-HI-101 and Pusa-HI-102 had an average haploid induction rate of 8.45 ± 0.96% and 10.46 ± 1.15%, respectively. Lines wild-type MTL gene did not generate any haploid. In comparison with 27 orthologues of 21 grass species, maize MTL gene had the closest ancestry with Saccharum spontaneum and Sorghum. The information generated here assumes great significance in understanding the diversity of MTL gene and presence of paralogues and orthologues. This is the first report on haplotype analysis and molecular characterization of MTL gene in maize and related grass species.
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Acknowledgements
The First author is thankful to the Human Resource Development Group (HRDG) division of the Council of Scientific & Industrial Research (CSIR), New Delhi, India for the Junior Research Fellowship (File No.: 09/083(0383)/2019-EMR-I) to pursue his Ph.D. program.
Funding
This study was funded by ICAR-IARI, New Delhi, CRP on Hybrid Technology (Maize Component) (24-142G), and Department of Biotechnology-TWIN sponsored project on ‘Development of locally adapted haploid inducer lines in maize through marker-assisted introgression of pollen-specific MATRILINEAL phospholipase gene’ [BT/PR25134/NER/95/1035/2017].
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Conduct of the experiment: SD; Gene diversity analysis: RC; Primer designing and protocol standardization for sequencing: VM and NG, Flow cytometry: RS, Paralogue analysis: RUZ, Orthologue analysis: JM and NG, Manuscript writing: SD and FH; Editing of manuscript: ELD, Designing of experiment: FH and KS.
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Dutta, S., Chhabra, R., Muthusamy, V. et al. Allelic variation and haplotype diversity of Matrilineal (MTL) gene governing in vivo maternal haploid induction in maize. Physiol Mol Biol Plants (2024). https://doi.org/10.1007/s12298-024-01456-3
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DOI: https://doi.org/10.1007/s12298-024-01456-3