Dominant inhibition of awn development by a putative zinc-finger transcriptional repressor expressed at the B1 locus in wheat.

ABSTRACT: Awns, bristle-like structures extending from grass lemmas, provide protection against predators, contribute to photosynthesis and aid in grain dispersal. In wheat, selection of awns with minimal extension, termed awnletted, has occurred during domestication by way of loci that dominantly inhibit awn development, such as Tipped1 (B1), Tipped2 (B2), and Hooded (Hd). Here we identify and characterize the B1 gene. B1 was identified using bulked segregant RNA-sequencing of an F₂ durum wheat population and through deletion mapping of awned bread wheat mutants. Functional characterization was accomplished by gene overexpression while haplotype analyses assessed B1 polymorphisms and genetic variation. Located on chromosome 5A, B1 is a C2H2 zinc finger encoding gene with ethylene-respons

SUBMITTER: Huang D 

PROVIDER: S-EPMC6916588 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature