Welcome To Website IAS

Hot news
Achievement

Independence Award

- First Rank - Second Rank - Third Rank

Labour Award

- First Rank - Second Rank -Third Rank

National Award

 - Study on food stuff for animal(2005)

 - Study on rice breeding for export and domestic consumption(2005)

VIFOTEC Award

- Hybrid Maize by Single Cross V2002 (2003)

- Tomato Grafting to Manage Ralstonia Disease(2005)

- Cassava variety KM140(2010)

Centres
Website links
Vietnamese calendar
Library
Visitors summary
 Curently online :  5
 Total visitors :  5074508

Mechanism and function of root circumnutation
Wednesday, 2021/03/03 | 05:13:56

Isaiah Taylor, Kevin Lehner,  Erin McCaskey, Niba Nirmal,  Yasemin Ozkan-Aydin, Mason Murray-Cooper,  Rashmi Jain,  Elliot W. Hawkes,  Pamela C. Ronald,  Daniel I. Goldman, and Philip N. Benfey

PNAS February 23, 2021 118 (8) e2018940118

Significance

Root growth in soil is complex. With limited sensory input, roots must navigate an environment containing heterogeneities such as rocks and compaction. The ability of roots to penetrate soil is crucial for water and nutrient uptake as well as mechanical anchorage. Here, we describe a molecular framework controlling helical root growth known as circumnutation. Functional characterization of circumnutation is consistent with the hypothesis that it is crucial for exploratory behavior and substrate penetration. This work lays a foundation for an integrated understanding of how roots grow in soil.

Abstract

Early root growth is critical for plant establishment and survival. We have identified a molecular pathway required for helical root tip movement known as circumnutation. Here, we report a multiscale investigation of the regulation and function of this phenomenon. We identify key cell signaling events comprising interaction of the ethylene, cytokinin, and auxin hormone signaling pathways. We identify the gene Oryza sativa histidine kinase-1 (HK1) as well as the auxin influx carrier gene OsAUX1 as essential regulators of this process in rice. Robophysical modeling and growth challenge experiments indicate circumnutation is critical for seedling establishment in rocky soil, consistent with the long-standing hypothesis that root circumnutation facilitates growth past obstacles. Thus, the integration of robotics, physics, and biology has elucidated the functional importance of root circumnutation and uncovered the molecular mechanisms underlying its regulation.

 

See: https://www.pnas.org/content/118/8/e2018940118

 

Figure 1:

Phenotypic analysis of the hk1 mutant. (A) Primary root depth 2 d after germination for wild type and the hk1-1 mutant. n = 8 and 18 primary roots for wild type and mutant, respectively. Two-sided Wilcoxon Rank Sum test P value = 7.1 × 10−5. The horizontal dash indicates mean value. (B) Two-dimensional projected displacement of root tip from central axis of growth every 15 min for 48 h after germination. Red plots represent natural cubic splines fit to the data for visualization. (C) Quantification of average radius of circumnutation in wild type and hk1 between 40 and 48 h after germination. n = 7 primary roots for each genotype. Two-sided Wilcoxon Rank Sum test P value = 0.0005828. The horizontal dash indicates mean value. (D) Example circumnutating wild-type primary root exhibiting higher epidermal cell elongation on the outer bend compared to the inner bend. (E) Quantification of the difference between outer and inner length of the region of 15 epidermal cells flanking the maximal bend in wild type, with n = 9. Two-sided Wilcoxon Signed Rank test P values = 0.003906. The horizontal dash indicates mean value.

Back      Print      View: 37

[ Other News ]___________________________________________________
  • Genome-wide analysis of autophagy-associated genes in foxtail millet (Setaria italica L.) and characterization of the function of SiATG8a in conferring tolerance to nitrogen starvation in rice.
  • Arabidopsis small nucleolar RNA monitors the efficient pre-rRNA processing during ribosome biogenesis
  • XA21-specific induction of stress-related genes following Xanthomonas infection of detached rice leaves.
  • Reducing the Use of Pesticides with Site-Specific Application: The Chemical Control of Rhizoctonia solani as a Case of Study for the Management of Soil-Borne Diseases
  • OsJRL, a rice jacalin-related mannose-binding lectin gene, enhances Escherichia coli viability under high-salinity stress and improves salinity tolerance of rice.
  • Production of lipopeptide biosurfactants by Bacillus atrophaeus 5-2a and their potential use in microbial enhanced oil recovery.
  • GhABF2, a bZIP transcription factor, confers drought and salinity tolerance in cotton (Gossypium hirsutum L.).
  • Resilience of cassava (Manihot esculenta Crantz) to salinity: implications for food security in low-lying regions.
  • Cellulose synthase complexes act in a concerted fashion to synthesize highly aggregated cellulose in secondary cell walls of plants
  • No adverse effects of transgenic maize on population dynamics of endophytic Bacillus subtilis strain B916-gfp
  • Identification and expression analysis of OsLPR family revealed the potential roles of OsLPR3 and 5 in maintaining phosphate homeostasis in rice
  • Functional analysis of molecular interactions in synthetic auxin response circuits
  • Titanium dioxide nanoparticles strongly impact soil microbial function by affecting archaeal nitrifiers.
  • Inducible Expression of the De-Novo Designed Antimicrobial Peptide SP1-1 in Tomato Confers Resistance to Xanthomonas campestris pv. vesicatoria.
  • Toward combined delignification and saccharification of wheat straw by a laccase-containing designer cellulosome
  • SNP-based discovery of salinity-tolerant QTLs in a bi-parental population of rice (Oryza sativa)
  • Pinpointing genes underlying the quantitative trait loci for root-knot nematode resistance in palaeopolyploid soybean by whole genome resequencing.
  • Transcriptome- Assisted Label-Free Quantitative Proteomics Analysis Reveals Novel Insights into Piper nigrum -Phytophthora capsici Phytopathosystem.
  • Brassinosteroids participate in the control of basal and acquired freezing tolerance of plants
  • Rapid hyperosmotic-induced Ca2+ responses in Arabidopsis thaliana exhibit sensory potentiation and involvement of plastidial KEA transporters

 

Designed & Powered by WEBSO CO.,LTD