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A NAC Gene regulating senescence improves grain protein, zinc, and iron content in wheat.

ABSTRACT: Enhancing the nutritional value of food crops is a means of improving human nutrition and health. We report here the positional cloning of Gpc-B1, a wheat quantitative trait locus associated with increased grain protein, zinc, and iron content. The ancestral wild wheat allele encodes a NAC transcription factor (NAM-B1) that accelerates senescence and increases nutrient remobilization from leaves to developing grains, whereas modern wheat varieties carry a nonfunctional NAM-B1 allele. Reduction in RNA levels of the multiple NAM homologs by RNA interference delayed senescence by more than 3 weeks and reduced wheat grain protein, zinc, and iron content by more than 30%.

SUBMITTER: Uauy C 

PROVIDER: S-EPMC4737439 | biostudies-literature | 2006 Nov

REPOSITORIES: biostudies-literature

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A NAC Gene regulating senescence improves grain protein, zinc, and iron content in wheat.

Uauy Cristobal C   Distelfeld Assaf A   Fahima Tzion T   Blechl Ann A   Dubcovsky Jorge J  

Science (New York, N.Y.) 20061101 5803

Enhancing the nutritional value of food crops is a means of improving human nutrition and health. We report here the positional cloning of Gpc-B1, a wheat quantitative trait locus associated with increased grain protein, zinc, and iron content. The ancestral wild wheat allele encodes a NAC transcription factor (NAM-B1) that accelerates senescence and increases nutrient remobilization from leaves to developing grains, whereas modern wheat varieties carry a nonfunctional NAM-B1 allele. Reduction i  ...[more]