Maize genotypes with favourable dgat1–2 and fatb alleles possess stable high kernel oil and better fatty acid health and nutritive indices

Diverse uses of maize oil attracted various stakeholders, including food, feed, and bioenergy, highlighting the increased demand for sustainable production. Here, 48 diverse sub-tropical maize genotypes varying for dgat1–2 and fatb genes governing oil attributes, were evaluated in three diverse loca...

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Published in:International journal of biological macromolecules 2024-10, Vol.278 (Pt 3), p.134848, Article 134848
Main Authors: Katral, Ashvinkumar, Hossain, Firoz, Zunjare, Rajkumar U., Ragi, Shridhar, Kasana, Ravindra K., Duo, Hriipulou, Gopinath, Ikkurti, Mehta, Brijesh K., Guleria, Satish K., Thimmegowda, Vinutha, Vasudev, Sujata, Kumar, Bhupender, Karjagi, Chikkappa G., Pandey, Sushil, Neeraja, Chirravuri N., Yadava, Devendra K., Muthusamy, Vignesh
Format: Article
Language:English
Subjects:
dgat1–2 &fatb mutants
Fatty acid composition
Gas chromatography
Kernel oil
Lipid health indices
Maize
Soxhlet apparatus
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Summary:Diverse uses of maize oil attracted various stakeholders, including food, feed, and bioenergy, highlighting the increased demand for sustainable production. Here, 48 diverse sub-tropical maize genotypes varying for dgat1–2 and fatb genes governing oil attributes, were evaluated in three diverse locations to assess trends of oil content, fatty acid (FA) profile, the effect of environment on oil attributes, the impact of different gene combinations and determine FA health and nutritional properties. The genotypes revealed wide variation in oil content (OC: 3.4–6.8 %) and FA compositional traits, namely palmitic (PA, 11.3–24.1 %), oleic (OA, 21.5–42.7 %), linoleic (LA, 36.6–61.7 %), and linolenic (ALA, 0.7–2.3 %) acids. Double-mutants with both favourable alleles (dd/ff) exhibited 51.6 % higher oil, 33.2 % higher OA, and 30.2 % reduced PA compared to wild-types (d+d+/f+f+) across locations. These double-mutants had lower saturated FA (12.2 %), and higher unsaturated FA (87.0 %), indicating reduced susceptibility to autooxidation, with lower atherogenicity (0.14), thrombogenicity (0.27) and peroxidisability (48.15), higher cholesterolemic index (7.16), optimum oxidability (5.27) and higher nutritive-value-index (3.35) compared to d+d+/f+f+, making them promising for significant health and nutritional benefits. Locally adapted stable novel double-mutants with high-oil and better FA properties identified here can expedite the maize breeding programs, meeting production demands and addressing long-standing challenges for breeders. •Growing demand (global CAGR of 7.62 % by 2032) for maize oil for food, feed, and bioenergy mandated increased production.•Inbreds evaluated demonstrated substantial variation in oil content and fatty acid profile.•Double mutants (dgat1–2/fatb, “A”) exhibited high oil content and better fatty acid health and nutritional properties.•“A” had 52 % more oil, 33 % higher oleic acid, and 30 % lower palmitic acid than “D” (wild-type) inbreds.•Double mutants with higher nutritional values have significance in maize biofortification.
ISSN:0141-8130
1879-0003
1879-0003
DOI:10.1016/j.ijbiomac.2024.134848