The TaTCP4/10-B1 cascade regulates awn elongation in wheat (Triticum aestivum L.).

ABSTRACT: Awns are important morphological markers for wheat and exert a strong physiological effect on wheat yield. The awn elongation suppressor B1 has recently been cloned through association and linkage analysis in wheat. However, the mechanism of awn inhibition centered around B1 remains to be clarified. Here, we identified an allelic variant in the coding region of B1 through analysis of re-sequencing data; this variant causes an amino acid substitution and premature termination, resulting in a long-awn phenotype. Transcriptome analysis indicated that B1 inhibited awn elongation by impeding cytokinin- and auxin-promoted cell division. Moreover, B1 directly repressed the expression of TaRAE2 and TaLks2, whose orthologs have been reported to promote awn development in rice or barley. More import

SUBMITTER: Ke W 

PROVIDER: S-EPMC10363512 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature