Mutation of OUR1/OsbZIP1, which encodes a member of the basic leucine zipper transcription factor family, promotes root development in rice through repressing auxin signaling

A well-developed root system is essential for efficient water uptake, particularly in drought-prone environments. However, the molecular mechanisms underlying promotion of development are poorly understood. We identified and characterized a rice mutant, outstanding rooting1 (our1), which exhibited system. The our1 mutant displayed typical auxin-related phenotypes, including elongated seminal defective gravitropism. Seminal elongation was accelerated via cell division elongation. In addition, compared with wild type, density short thin lateral roots (S-type LRs) reduced whereas that long thick LRs (L-type increased. Expression OUR1, encodes OsbZIP1, member basic leucine zipper transcription factor family, observed tip sites LR emergence, wherein attenuation reporter gene expression levels controlled by auxin response promoter DR5 also mutant. Taken together, our results indicate promotes suppressing signaling, may be key contributing to an improvement architecture.