polyploidy-breeding
Polyploidy breeding involves deliberately inducing or selecting for extra sets of chromosomes in plants, going beyond the typical two copies found in most species. This technique matters because polyploid plants often exhibit increased size, hardiness, and genetic diversity, traits that can enhance disease resistance, adaptability, and hybrid vigor. Studying and manipulating polyploidy also helps researchers understand plant evolution and speciation, since many plant lineages have arisen through natural polyploidization events.
open_in_new WikipediaPubMed · 2026-06-18
Researchers identified a gene in hybrid tulip trees that, when overexpressed, both boosts the efficiency of growing new plants from ordinary cells and triggers chromosome doubling — effectively creating a molecular shortcut to polyploid breeding without traditional crossing methods.
Overexpressing the LhAHL15 gene significantly improved both somatic embryogenesis efficiency and embryogenic callus induction in hybrid tulip trees by upregulating key developmental genes including BBM, LEC1, PIN1, PLT2, ARR7, and ARF12.
Flow cytometry confirmed that chromosome number in LhAHL15-overexpressing plants was approximately twice that of controls, demonstrating induced polyploidy.
LhAHL15 promoter activity begins at the earliest stages of embryo development and remains active through all embryo stages — spherical, heart-shaped, torpedo-shaped, and cotyledonary — marking it as a core regulator throughout somatic embryogenesis.
