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 :  3
 Total visitors :  5115001

DNA hypomethylation in tetraploid rice potentiates stress-responsive gene expression for salt tolerance
Thursday, 2021/04/01 | 08:51:53

Longfei Wang, Shuai Cao, Peitong Wang, Kening Lu, Qingxin Song, Fang-Jie Zhao, and Z. Jeffrey Chen

PNAS March 30, 2021 118 (13) e2023981118

Significance

Polyploidy can stimulate genetic and epigenetic changes that enhance the potential for plant adaptation and fitness under extreme environments, but the molecular basis for this is poorly understood. Here we show that tetraploid rice is more tolerant to salinity than diploid rice. Tetraploidy induces DNA hypomethylation which potentiates genomic loci coexistent with stress-responsive genes including those in jasmonate biosynthesis and signaling pathways for rapid and robust responses under stress. After salt stress, elevated expression of salt-responsive genes can induce hypermethylation and suppress adjacent TEs. This feedback regulation between polyploidy-induced DNA hypomethylation in rapid and strong stress response and stress-induced hypermethylation to repress TEs and/or TE-associated genes may provide evolutionary advantages for selection to enhance adaptation in polyploid plants and crops.

Abstract

Polyploidy is a prominent feature for genome evolution in many animals and all flowering plants. Plant polyploids often show enhanced fitness in diverse and extreme environments, but the molecular basis for this remains elusive. Soil salinity presents challenges for many plants including agricultural crops. Here we report that salt tolerance is enhanced in tetraploid rice through lower sodium uptake and correlates with epigenetic regulation of jasmonic acid (JA)–related genes. Polyploidy induces DNA hypomethylation and potentiates genomic loci coexistent with many stress-responsive genes, which are generally associated with proximal transposable elements (TEs). Under salt stress, the stress-responsive genes including those in the JA pathway are more rapidly induced and expressed at higher levels in tetraploid than in diploid rice, which is concurrent with increased jasmonoyl isoleucine (JA-Ile) content and JA signaling to confer stress tolerance. After stress, elevated expression of stress-responsive genes in tetraploid rice can induce hypermethylation and suppression of the TEs adjacent to stress-responsive genes. These induced responses are reproducible in a recurring round of salt stress and shared between two japonica tetraploid rice lines. The data collectively suggest a feedback relationship between polyploidy-induced hypomethylation in rapid and strong stress response and stress-induced hypermethylation to repress proximal TEs and/or TE-associated stress-responsive genes. This feedback regulation may provide a molecular basis for selection to enhance adaptation of polyploid plants and crops during evolution and domestication.

 

See: https://www.pnas.org/content/118/13/e2023981118

 

Figure 1:

Enhanced salinity tolerance in 02428 tetraploid rice. (A) Morphological changes in diploid (2×) and tetraploid (4×) rice in response to saline treatments (0 and 125 mM NaCl) for 6 d followed by recovery in water for 5 d. (Scale bar = 5 cm.) (B) Survival rates of diploid and tetraploid rice (n = 6 biological replicates, each replicate with 32 plants). (C) Inhibition rates of diploid and tetraploid rice after salt stress. Seedlings at trefoil stage were treated with 125 mM NaCl for 1 to 5 d. Dry weight of roots was used to calculate inhibition rates (n = 18 biological replicates, each replicate with 2 plants). (D) Sodium content in roots under the saline condition for 2 and 4 d (n = 12 biological replicates, each replicate with 2 plants). Single and double asterisks indicate statistical significance of P < 0.05 and P < 0.01, respectively (Student’s t test).

Back      Print      View: 38

[ 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