Transgenerational effects of inter-ploidy cross direction on reproduction and F2 seed development of Arabidopsis thaliana F1 hybrid triploids.

摘要: Reproduction in triploid plants is important for understanding polyploid population dynamics. We show that genetically identical reciprocal F1 hybrid triploids can display transgenerational epigenetic effects on viable F2 seed development. The success or failure of reproductive outcomes from intra-species crosses between different ploidy levels an factor flowering plant evolution and crop breeding. However, the inter-ploidy cross directions offspring fitness are poorly understood. In Arabidopsis thaliana, hybridization diploid tetraploid produce plants. When selfed, such act as aneuploid gamete production “machines” where vast majority gametes generated which, following sexual reproduction, generate swarms progeny (Henry et al. 2009). There potential some aneuploids to cause gametophyte abortion and/or this study, we analyse 178 self-fertilized inter-accession demonstrate proportions aborted normally developed seeds selfed depend upon a combination natural variation direction, with strong interaction these factors. Single-seed analysis indicates embryonic DNA content phenotypically normal highly variable distributions also affected by genotype direction. Notably, grandparent-of-origin set, hence ability tolerate aneuploidy seed. differences regarding generated, averages seeds. To identify genetic tolerance seeds, carried out GWAS which identified two SNPs, termed MOT POT, represent candidate loci control proportion obtained triploids. Parental grandparental have consequences asymmetric gene flow, emergence novel genotypes populations, set crops.