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- W4320481931 abstract "Abstract Background Malnutrition affects large section of population worldwide. Vitamin-A and protein deficiencies have emerged as the major global health-issue. Traditional shrunken2 ( sh2 )-based sweet corn is deficient in provitaminA (proA), lysine and tryptophan. Natural variant of β-carotene hydroxylase1 ( crtRB1 ) and opaque2 ( o2 ) enhances proA, lysine and tryptophan in maize. So far, no sweet corn hybrid rich in these nutrients has been released elsewhere. Development of biofortified sweet corn hybrids would help in providing the balanced nutrition. Methods and Results We targeted three sh2 -based sweet corn inbreds (SWT-19, SWT-20 and SWT-21) for introgression of mutant crtRB1 and o2 genes using molecular breeding. The gene-based 3′TE-InDel and SSR ( umc1066 ) markers specific to crtRB1 and o2 , respectively were utilized in foreground selection in BC 1 F 1 , BC 2 F 1 and BC 2 F 2 . Segregation distortion was observed for crtRB1 and o2 genes in majority of populations. Background selection using 91-100 SSRs revealed recovery of recurrent parent genome (RPG) up to 96%. The introgressed progenies possessed significantly higher proA (13.56 µg/g), lysine (0.336%) and tryptophan (0.082%) over original versions (proA: 2.70 µg/g; lysine: 0.154% and tryptophan: 0.038%). Kernel sweetness among introgressed progenies (17.3%) was comparable to original sweet corn (17.4%). The introgressed inbreds exhibited higher resemblance with their recurrent parents for yield and morphological characters. Conclusion These newly developed biofortified sweet corn genotypes hold immense promise to alleviate malnutrition." @default.
- W4320481931 created "2023-02-14" @default.
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- W4320481931 date "2023-02-13" @default.
- W4320481931 modified "2023-10-18" @default.
- W4320481931 title "ProvitaminA, lysine and tryptophan enrichment in shrunken2-based sweet corn genotypes through genomics-assisted breeding for crtRB1 and opaque2 genes" @default.
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- W4320481931 doi "https://doi.org/10.21203/rs.3.rs-2549846/v1" @default.
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