Reducing brassinosteroid signalling enhances grain yield in semi-dwarf wheat

Abstract Modern green revolution varieties of wheat ( Triticum aestivum L.) confer semi-dwarf and lodging-resistant plant architecture owing to the Reduced height-B1b ( Rht-B1b ) and Rht-D1b alleles 1 . However, both Rht-B1b and Rht-D1b are gain-of-function mutant alleles encoding gibberellin signalling repressors that stably repress plant growth and negatively affect nitrogen-use efficiency and grain filling 2–5 . Therefore, the green revolution varieties of wheat harbouring Rht-B1b or Rht-D1b usually produce smaller grain and require higher nitrogen fertilizer inputs to maintain their grain yields. Here we describe a strategy to design semi-dwarf wheat varieties without the need for Rht-B1b or Rht-D1b…

• NN
  National Natural Science Foundation of China

  Awards: 32172069, 32072055, 31991210, U22A6009
• NK
  National Key Research and Development Program of China

  Awards: 32172069, 2022YFF1002902