A transposon inserted into HELD1 repressed maize husk leaf blade extension during maize domestication.

A transposon insertion in HELD1 is linked to reduced husk leaf blade extension during maize domestication, with the dominant allele prevalent in cultivated maize.

• Why it matters: Understanding the genetic changes underlying husk leaf reduction is crucial for improving maize yield and breeding strategies, as husk leaves influence grain filling.
• What they did: Researchers identified a major QTL, HELD1, associated with husk leaf blade length, revealing a 133-bp Harbinger transposon insertion that enhances tru1 transcription through TB1 binding motifs.
• The result: The transposon insertion in HELD1 became the dominant allele in domesticated maize and significantly increases yield, highlighting its role in husk and leaf architecture regulation.