From field loss to yield security: Genetic pathways for building pod shattering-resistant rapeseed cultivars

ABSTRACT Pod shattering, while a natural mechanism for seed dispersal, is an undesirable agronomic trait in rapeseed ( Brassica napus L.) that complicates mechanical harvesting. It typically causes yield losses of 5-15%, which can be further worsened under dry and hot conditions. As most of the modern rapeseed cultivars remain susceptible to shattering, enhancing pod shattering resistance (PSR) is important to safeguard global rapeseed production. Significant progresses have been made in elucidating the molecular and genetic mechanisms of silique dehiscence in the model plant Arabidopsis and pod shattering in rapeseed. This review firstly summarizes the genetic network controlling silique dehiscence in Arabidopsis , which is largely conserved in closely related Brassica species. We then synthesize discoveries from both forward and reverse genetic studies in rapeseed. Finally, the major challenges and future prospects in PSR research and breeding are discussed in depth.