Development of [beta]-Carotene Rich Maize Hybrids through Marker-Assisted Introgression of [beta]-carotene hydroxylase Allele

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From: PLoS ONE(Vol. 9, Issue 12)
Publisher: Public Library of Science
Document Type: Article
Length: 7,323 words
Lexile Measure: 1500L

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Abstract :

Development of vitamin A-rich cereals can help in alleviating the widespread problem of vitamin A deficiency. We report here significant enhancement of kernel [beta]-carotene in elite maize genotypes through accelerated marker-assisted backcross breeding. A favourable allele (543 bp) of the [beta]-carotene hydroxylase (crtRB1) gene was introgressed in the seven elite inbred parents, which were low (1.4 [micro]g/g) in kernel [beta]-carotene, by using a crtRB1-specific DNA marker for foreground selection. About 90% of the recurrent parent genome was recovered in the selected progenies within two backcross generations. Concentration of [beta]-carotene among the crtRB1-introgressed inbreds varied from 8.6 to 17.5 [micro]g/g - a maximum increase up to 12.6-fold over recurrent parent. The reconstituted hybrids developed from improved parental inbreds also showed enhanced kernel [beta]-carotene as high as 21.7 [micro]g/g, compared to 2.6 [micro]g/g in the original hybrid. The reconstituted hybrids evaluated at two locations possessed similar grain yield to that of original hybrids. These [beta]-carotene enriched high yielding hybrids can be effectively utilized in the maize biofortification programs across the globe.

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Gale Document Number: GALE|A418634837