Abstract
Background
In-vivo maternal haploids serve as the basis of doubled haploid (DH) breeding in maize. R1-navajo (R1-nj) gene governing anthocyanin colouration in the endosperm and embryo is widely used to identify haploid seeds. However, the expression of R1-nj depends on genetic-background of source-germplasm used for deriving DH-lines. Further, presence of C1-Inhibitor (C1-I) gene suppresses the expression of R1-nj, thus makes the selection of haploids difficult.
Methods
In the present study, 178 subtropically-adapted maize inbreds were crossed with two R1-nj donors ‘that do not have haploid induction genes’. Of these, 76.4% inbreds developed purple colour in endosperm, while 23.6% did not show any colouration. In case of scutellum, 62.9% inbreds possessed colour and 37.1% were colourless. The anthocyanin intensity varied greatly, with 19.66% and 42.98% inbreds displayed the least intensity, while 16.85% and 0.84% inbreds showed the highest intensity in endosperm and scutellum, respectively. Two C1-I specific breeder-friendly markers (MGU-CI-InDel8 and MGU-C1-SNP1) covering (i) 8 bp InDel and (ii) A to G SNP, respectively, were developed. MGU-CI-InDel8 and MGU-C1-SNP1 markers predicted presence of C1-I allele with 92.9% and 84.7% effectiveness, respectively. However, when both markers were considered together, they provided 100% effectiveness.
Conclusions
These markers of C1-I gene would help in saving valuable resources and time during haploid induction in maize. The information generated here assume great significance in DH breeding of maize.
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Acknowledgements
Authors thank ICAR-IARI, New Delhi for providing the lab and field facilities. The support of AICRP centres and CIMMYT, Mexico for providing the inbred lines is also acknowledged.
Funding
The financial support of IARI, New Delhi and DBT 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] is duly acknowledged.
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Conduct of the experiment: NG; Primer designing and genotyping: RC; Generation of crosses: RUZ; Maintenance of inbreds and raising of field experiment: VM; Recording of anthocyanin score: RC, SD and GC; Manuscript writing: NG and FH; Editing of manuscript: ELD, VM, JM and AK; Designing of experiment: FH, KS and SC.
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Gain, N., Chhabra, R., Chandra, S. et al. Variation in anthocyanin pigmentation by R1-navajo gene, development and validation of breeder-friendly markers specific to C1-Inhibitor locus for in-vivo haploid production in maize. Mol Biol Rep 50, 2221–2229 (2023). https://doi.org/10.1007/s11033-022-08214-2
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DOI: https://doi.org/10.1007/s11033-022-08214-2