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Abstract

Apomixis, asexual reproduction through seeds, produces progeny clonal to the maternal parent. This property of apomixis could be used to fix hybrid vigor of F1 hybrids. Parthenogenesis, embryo development without fertilization, is an important component of apomixis. PsASGR-BBML gene, identified in apomictic Pennisetum squamulatum is a member of the BABY BOOM (BBM) gene family and induces parthenogenesis in rice, maize and pearl millet when expressed in an egg cell-specific manner. Multiple BBM genes are found in sexually reproducing species like rice and Setaria italica. Phylogenetic analysis of monocot BBMs revealed three phylogenetic clades. In this study, transgenes of one S. italica BBM from each clade and rice OsBBM1 were evaluated for their parthenogenetic potential. All transgenes induced parthenogenesis in an egg cell-specific manner, but also showed low seed set and parthenogenetic seed development. A fusion protein of PsASGR-BBML with Zsgreen1 was also functional in inducing parthenogenesis.

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