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Theor Appl Genet. 2008 Jul;117(2):157-70. doi: 10.1007/s00122-008-0762-y. Epub 2008 Apr 22.

Genetic analysis of opaque2 modifier loci in quality protein maize.

Author information

1
Department of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA.

Abstract

Quality protein maize (QPM) was created by selecting genetic modifiers that convert the starchy endosperm of an opaque2 (o2) mutant to a hard, vitreous phenotype. Genetic analysis has shown that there are multiple, unlinked o2 modifiers (Opm), but their identity and mode of action are unknown. Using two independently developed QPM lines, we mapped several major Opm QTLs to chromosomes 1, 7 and 9. A microarray hybridization performed with RNA obtained from true breeding o2 progeny with vitreous and opaque kernel phenotypes identified a small group of differentially expressed genes, some of which map at or near the Opm QTLs. Several of the genes are associated with ethylene and ABA signaling and suggest a potential linkage of o2 endosperm modification with programmed cell death.

PMID:
18427771
DOI:
10.1007/s00122-008-0762-y
[Indexed for MEDLINE]

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