Uncovering the mechanism of female restitution in sugarcane hybrids.

Unreduced maternal gametes in sugarcane hybrids result from second division restitution, revealing a key mechanism behind their reproductive success.

• Why it matters: Understanding this process addresses a long-standing gap in cytological knowledge and has implications for improving sugarcane breeding and genetic diversity.
• What they did: Researchers generated haplotype-resolved genomes of two sugarcane species and analyzed eight F1 hybrids using long-read sequencing and a novel algorithm to identify recombination patterns.
• The result: They discovered that maternal chromosomes undergo second division restitution, maintaining 62.5% of maternal diversity, which explains hybrid fertility and offers new avenues for genetic enhancement.