DELLA genes restrict inflorescence meristem function independently of plant height.

ABSTRACT: DELLA proteins associate with transcription factors to control plant growth in response to gibberellin ¹ . Semi-dwarf DELLA mutants with improved harvest index and decreased lodging greatly improved global food security during the 'green revolution' in the 1960-1970s ² . However, DELLA mutants are pleiotropic and the developmental basis for their effects on plant architecture remains poorly understood. Here, we show that DELLA proteins have genetically separable roles in controlling stem growth and the size of the inflorescence meristem, where flowers initiate. Quantitative three-dimensional image analysis, combined with a genome-wide screen for DELLA-bound loci in the inflorescence tip, revealed that DELLAs limit meristem size in Arabidopsis by directly upregulating

SUBMITTER: Serrano-Mislata A 

PROVIDER: S-EPMC5669458 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature