ArticleBMC plant biology2019
Maize brachytic2 (br2) suppresses the elongation of lower internodes for excessive auxin accumulation in the intercalary meristem region.
Article in BMC plant biology, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.
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20 citing papers in PubMed, 33 citations in OpenAlex.
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- Decades' progress and prospects on maize functional genomics and molecular breeding.Science China. Life sciences · 2025Review
- Genetic mapping and isolation of Rht28, a locus on wheat chromosome arm 2AL affecting plant height, grain size, and grain weight.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2025Article
- Longer Internode with Same Cell Length:Plants (Basel, Switzerland) · 2025Article
- Maize-Tripsacum-Teosinte allopolyploid (MTP), a novel dwarf mutant inducer tool in maize.Plant biotechnology journal · 2025Article
- Yield and yield component trait analysis with DArT genotyping for GWAS in soybean grown in drought conditions of Kazakhstan.Frontiers in plant science · 2025Article
- Coordinated control for the auricle asymmetric development by ZmIDD14 and ZmIDD15 fine-tune the high-density planting adaption in maize.Plant biotechnology journal · 2024Article
- Citrus ACC synthase CiACS4 regulates plant height by inhibiting gibberellin biosynthesis.Plant physiology · 2023Article
- Novel insights into maize (Zea mays) development and organogenesis for agricultural optimization.Planta · 2023Review
- An EMS-induced allele of the brachytic2 gene can reduce plant height in maize.Plant cell reports · 2023Article
- The mutation of C-24 reductase, a key enzyme involved in brassinolide biosynthesis, confers a novel compact plant architecture phenotype to cucumber.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2022Article
- ZmTE1 promotes plant height by regulating intercalary meristem formation and internode cell elongation in maize.Plant biotechnology journal · 2022Article
- Height to first pod: A review of genetic and breeding approaches to improve combine harvesting in legume crops.Frontiers in plant science · 2022Review
- Synthesis and regulation of auxin and abscisic acid in maize.Plant signaling & behavior · 2021Review
- Understanding Omics Driven Plant Improvement andFrontiers in genetics · 2021Review
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17 authors at 3 institutions in 1 country.
Funding
Abstract
backgroundShort internodes contribute to plant dwarfism, which is exceedingly beneficial for crop production. However, the underlying mechanisms of internode elongation are complicated and have been not fully understood.
resultsHere, we report a maize dwarf mutant, dwarf2014 (d2014), which displays shortened lower internodes. Map-based cloning revealed that the d2014 gene is a novel br2 allele with a splicing variation, resulting in a higher expression of BR2-T02 instead of normal BR2-T01. Then, we found that the internode elongation in d2014/br2 exhibited a pattern of inhibition-normality-inhibition (transient for the ear-internode), correspondingly, at the 6-leaf, 12-leaf and 14-leaf stages. Indeed, BR2 encodes a P-glycoprotein1 (PGP1) protein that functions in auxin efflux, and our in situ hybridization assay showed that BR2 was mainly expressed in vascular bundles of the node and internode. Furthermore, significantly higher auxin concentration was detected in the stem apex of d2014 at the 6-leaf stage and strictly in the node region for the ear-internode at the 14-leaf stage. In such context, we propose that BR2/PGP1 transports auxin from node to internode through the vascular bundles, and excessive auxin accumulation in the node (immediately next to the intercalary meristem) region suppresses internode elongation of d2014.
conclusionsThese findings suggest that low auxin levels mediated by BR2/PGP1 in the intercalary meristem region are crucial for internode elongation.
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