scholarly journals A reflux-and-growth mechanism explains oscillatory patterning of lateral root branching sites

2021 ◽  
Author(s):  
Thea van den Berg ◽  
Kavya Yalamanchili ◽  
Hugues de Gernier ◽  
Joana Santos Teixeira ◽  
Tom Beeckman ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Lateral Root ◽  
Root Branching

scholarly journals Editorial: Root Branching: From Lateral Root Primordium Initiation and Morphogenesis to Function

2019 ◽  
Vol 10 ◽  
Author(s):  
Joseph G. Dubrovsky ◽  
Hidehiro Fukaki ◽  
Laurent Laplaze ◽  
Marta Laskowski
Keyword(s):  
Lateral Root ◽  
Root Branching ◽  
Lateral Root Primordium ◽  
Root Primordium

scholarly journals Plasticity of Lateral Root Branching in Maize

2019 ◽  
Vol 10 ◽  
Author(s):  
Peng Yu ◽  
Frank Hochholdinger ◽  
Chunjian Li
Keyword(s):  
Lateral Root ◽  
Root Branching

scholarly journals Shoot-derived miR2111 controls legume root and nodule development

2020 ◽  
Author(s):  
Mengbai Zhang ◽  
Huanan Su ◽  
Peter M. Gresshoff ◽  
Brett J. Ferguson
Keyword(s):  
Lateral Root ◽  
Lateral Roots ◽  
Ectopic Expression ◽  
Root System Architecture ◽  
Negative Regulator ◽  
Nodule Development ◽  
Wild Type ◽  
Root Branching ◽  
Autoregulation Of Nodulation ◽  
Cle Peptide

AbstractLegumes control their nodule numbers through the Autoregulation Of Nodulation (AON). Rhizobia infection stimulates the production of root-derived CLE peptide hormones that are translocated to the shoot where they regulate a new signal. We used soybean to demonstrate that this shoot-derived signal is miR2111, which is transported via phloem to the root where it targets transcripts of Too Much Love (TML), a negative regulator of nodulation. Shoot perception of rhizobia-induced CLE peptides suppresses miR2111 expression, resulting in TML accumulation in roots and subsequent inhibition of nodule organogenesis. Feeding synthetic mature miR2111 via the petiole increased nodule numbers per plant. Likewise, elevating miR2111 availability by over-expression promoted nodulation, while target mimicry of TML induced the opposite effect on nodule development in wild-type plants and alleviated the supernodulating and stunted root growth phenotypes of AON-defective mutants. Additionally, in non-nodulating wild-type plants, ectopic expression of miR2111 significantly enhanced lateral root emergence with a decrease in lateral root length and average root diameter. In contrast, hairy roots constitutively expressing the target mimic construct exhibited reduced lateral root density. Overall, these findings demonstrate that miR2111 is both the critical shoot-to-root factor that positively regulates root nodule development, and also acts to shape root system architecture via orchestrating the degree of root branching, as well as the length and thickness of lateral roots.

scholarly journals Involvement of a truncated MADS-box transcription factor ZmTMM1 in root nitrate foraging

2020 ◽  
Vol 71 (15) ◽  
pp. 4547-4561
Author(s):  
Ying Liu ◽  
Zhongtao Jia ◽  
Xuelian Li ◽  
Zhangkui Wang ◽  
Fanjun Chen ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Lateral Root ◽  
Lateral Roots ◽  
Morphological Plasticity ◽  
Underlying Mechanism ◽  
Grass Species ◽  
Mads Box ◽  
Genetic Redundancy ◽  
Root Branching ◽  
Lateral Root Development

Abstract Plants can develop root systems with distinct anatomical features and morphological plasticity to forage nutrients distributed heterogeneously in soils. Lateral root proliferation is a typical nutrient-foraging response to a local supply of nitrate, which has been investigated across many plant species. However, the underlying mechanism in maize roots remains largely unknown. Here, we report on identification of a maize truncated MIKC-type MADS-box transcription factor (ZmTMM1) lacking K- and C-domains, expressed preferentially in the lateral root branching zone and induced by the localized supply of nitrate. ZmTMM1 belongs to the AGL17-like MADS-box transcription factor family that contains orthologs of ANR1, a key regulator for root nitrate foraging in Arabidopsis. Ectopic overexpression of ZmTMM1 recovers the defective growth of lateral roots in the Arabidopsis anr1 agl21 double mutant. The local activation of glucocorticoid receptor fusion proteins for ZmTMM1 and an artificially truncated form of AtANR1 without the K- and C-domains stimulates the lateral root growth of the Arabidopsis anr1 agl21 mutant, providing evidence that ZmTMM1 encodes a functional MADS-box that modulates lateral root development. However, no phenotype was observed in ZmTMM1-RNAi transgenic maize lines, suggesting a possible genetic redundancy of ZmTMM1 with other AGL17-like genes in maize. A comparative genome analysis further suggests that a nitrate-inducible transcriptional regulation is probably conserved in both truncated and non-truncated forms of ZmTMM1-like MADS-box transcription factors found in grass species.

scholarly journals Heuristic Aspect of the Lateral Root Initiation Index: A Case Study of the Role of Nitric Oxide in Root Branching

2013 ◽  
Vol 1 (10) ◽  
pp. 1300029 ◽  
Author(s):  
Veronica Lira-Ruan ◽  
Selene Napsucialy Mendivil ◽  
Joseph G. Dubrovsky
Keyword(s):  
Nitric Oxide ◽  
Lateral Root ◽  
Root Initiation ◽  
Root Branching ◽  
Lateral Root Initiation
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