Alteration of gene expression in rice hybrid F_(1) and its parantal seedlings

Abstract

Hybrid ric (Oryza sativa L.) seedling is more vigorus in root development and plant growth than its parental lines in the tested indica rice of hybridized combination (Shanyou 63(F_(1)): ♀Zhenshan 97A×♂Minghui 63). Analysis of the difference in gene expression between the hybrid F_(1) and its parental seedlings by means of mRNA differential display indicated that gene expression of the parental lines was obviously altered the hybrid F_(1) both in quantity and quality. Quantitatively, there were over-expression and under-expression of genes in hybrid F_(1) with genetic expression trend forwards a signle parent. Qualititatively, hybrid F_(1) could have specific gene expression, single parent (maternal or paternal) gene silence, co-suppression of paternal genes, and single paternal gene expression. The relationship between heterosis formation and alteration of gene expression of parental lines in hybrid F_(1) was also discussed.