Heslop-Harrison J S
Karyobiology Group, JI Centre for Plant Science Research, Norwich, UK.
Dev Suppl. 1990:21-8.
Genomic imprinting, where the genes from one parent have different expression properties to those of the other parent, occurs in plants. It has potentially significant consequences because of the importance of hybrids in plant evolution and plant breeding, and provides a mechanism that can hide genetic variation for many generations. The study of nuclear organization shows that chromosome and genome position relates to imprinting in F1 hybrids, with peripheral genomes tending to be expressed preferentially. In some inbred, polyploid hybrids, such as Triticale (a wheat x rye hybrid), treatment with the demethylation agent azacytidine releases hidden variation, which was perhaps lost because of imprinting phenomena.
基因组印记现象，即来自一方亲本的基因与另一方亲本的基因具有不同的表达特性，在植物中存在。由于杂种在植物进化和植物育种中的重要性，它具有潜在的重大影响，并提供了一种能够使遗传变异隐藏多代的机制。核组织研究表明，染色体和基因组位置与F1杂种中的印记有关，外围基因组往往优先表达。在一些自交多倍体杂种中，如小黑麦（小麦与黑麦的杂种），用去甲基化剂氮杂胞苷处理会释放隐藏的变异，这些变异可能因印记现象而丢失。
