Abstract
And Baby Makes Three: Genomic Imprinting in Plant Embryos
Highlights
Data on imprinted gene function and expression pattern from mammals [5] support these ideas, and there is a growing body of similar evidence from plants
The parental dosagerelated enhanced or repressed seed development that can follow interploidy crosses has been proposed to be mediated by disruption of allele-specific genomic imprinting [6,7,8]
An unambiguous role for imprinting control of nutrient transfer was demonstrated using the imprinted meg1 gene in maize, which directly regulates maternal provisioning of the embryo and controls ultimate seed composition and size in a strictly gene dosage–dependent manner [11]. This clear involvement of imprinting in quantitative aspects of seed development has obvious implications for agricultural traits, and imprinted genes may represent an unrecognized pool of variation that can be exploited for crop improvement
Summary
Data on imprinted gene function and expression pattern from mammals [5] support these ideas, and there is a growing body of similar evidence from plants. There is evidence from maize that parental dosage regulates genes controlling key stages of seed development [9], and, in Arabidopsis, imprinted Polycomb Group (PcG) proteins [10] have been shown indirectly to control seed size.
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