Hasi Yu's research while affiliated with University of North Texas and other places
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Publications (14)
Altering the content or composition of the cell wall polymer lignin is a favored approach to valorize lignin toward biomaterial and chemical production in the biorefinery. However, modifying lignin or cellulose in transgenic plants can induce expression of defense responses and negatively affect growth. Through genetic screening for suppressors of...
Background
Lignification of secondary cell walls is a major factor conferring recalcitrance of lignocellulosic biomass to deconstruction for fuels and chemicals. Genetic modification can reduce lignin content and enhance saccharification efficiency, but usually at the cost of moderate-to-severe growth penalties. We have developed a method, using a...
Significance
Lignin deposition in plants is affected by environmental stress, and stress-signaling involves increases in the levels of the plant hormone abscisic acid (ABA). Here we show, using a combination of biochemical and genetic approaches, how ABA can regulate lignin biosynthesis. This involves phosphorylation of the master lignin transcript...
Reduction in SCW thickness by RNAi repression of SIZ1 in cell types that undergo SCW thickening.
(A) Wild type (WT, Col-0) plant (left), transgenic Arabidopsis thaliana plants with SND1 promoter controlled RNAi inhibition of SIZ1 (middle) and siz1 mutants (right). (B-D) Cross sections of WT and SIZ1 RNAi transgenic plant stems stained with phlorogl...
The LBD30 expression level in the basal first and second internodes of inflorescence stems of wild-type (WT) and siz1 plants.
Relative levels were normalized to ACT2. The transcript level of LBD30 in WT was set to 1.0. Data represent average values±SD (n = 3 replicates).
(TIF)
A wide range of biological processes are regulated by sumoylation, a post-translational modification involving the conjugation of SUMO (Small Ubiquitin-Like Modifier) to protein. In Arabidopsis thaliana, AtSIZ1 encodes a SUMO E3 ligase for SUMO modification. siz1 mutants displayed defective secondary cell walls (SCWs) in inflorescence fiber cells....
Immunoblot detection of LBD30-cHA expression.
(A) The protein expression level of LBD30-cHA. ACTIN was used as an internal control, detected by an anti-ACTIN antibody (1:3000 dilution, Abmart). (B,C) Lignin autofluorescent signals of cotyledons of LBD30 overexpressing transgenic plant in the nst1/snd1 double mutant background and the nst1/snd1 doub...
SIZ1 promoter activity in inflorescence stems.
(A) SIZ1 promoter-GUS (β-glucuronidase) expression in a cross-section of an internode near the cessation of elongation in an inflorescence stem of a 4 weeks old transgenic Arabidopsis thaliana plant. (B) High magnification of a stem section of a SIZ1 promoter-GUS transgenic plant. co: cortex, if: inter...
Fluorescent signals of green fluorescent protein (GFP) fused LBD30 proteins in Arabidopsis thaliana leaf protoplasts.
(A) A protoplast expressing GFP alone. (B, C) Protoplasts expressing GFP tagged LBD30. (D, E) Protoplasts expressing GFP tagged LBD30(K226R).
(TIF)
LBD30 expression profile during Arabidopsis thaliana development.
The region indicated by the black line is the second internode of the inflorescence stem. Data were obtained from the AtGenExpress Visualization Tool (http://jsp.weigelworld.org/expviz/expviz.jsp).
(TIF)
Predicted sumoylation sites in SCW related proteins by GPS-SUMO.
(XLS)
Examination of LBD30 sumoylation in tobacco.
Myc tagged AtSIZ1, FLAG-tagged AtSUMO1, and HA-tagged LBD30 or LBD30(K226R) were expressed in tobacco leaves as indicated. Expression of the proteins was detected by anti-Myc, anti-HA and anti-FLAG antibodies, respectively. After immunoprecipitation with an anti-FLAG antibody, sumoylated LBD30 was detect...
Breeding semi-dwarf varieties to improve lodging resistance has proven to be enormously successful in increasing grain yield since the advent of the "green revolution". However, the breeding of the majority of semi-dwarf rice varieties in Asia has been dependent on genetic introduction of the mutant alleles of SD1, which encodes a GA 20-Oxidase, Os...
Citations
... FERONIA is a transmembrane kinase involved in various cellular processes which has recently been implicated in the maintenance of cell wall integrity. [9][10][11] Thus, we were interested in exploring the involvement of FERONIA in the context of eATP signaling following our recent discovery of eATP's role in regulating root growth by modifying cell wall morphology in the primary root tip. 12 To this end, we evaluated eATP responses in the FERONIA mutant, fer-4, and found that loss of FERONIA perturbed eATP-responsive Ca 2+ influx, gene expression, and cell wall modification. ...
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... The Clustered Regularly Interspaced Short Palindromic Repeats/CRISPR-associated proteins (CRISPR-Cas) have emerged as a breakthrough breeding tool in recent years. Studies have shown that this tool can be used to reduce plant biomass lignin content [53] and increase seed oil and fatty acid content in oilseed crops [54]. Although still under development, this revolutionary tool likely will make big differences to cover crop farming and biofuel industry. ...
... Considering the functional enrichment of the identi ed modules, two lignin-enriched signi cant modules were selected (Table S4). The brown and yellow modules contained 19 and 15 lignin genes, respectively, which were reported in previous studies (Liu et al., 2021). Results of KEGG enrichment analysis carried out on 2 selected modules showed that there was a considerable number of the genes expressed in the metabolic pathway; moreover, a dramatic change of plants metabolism was observed in the secondary metabolic pathway that was resulted from stress adaptation. ...
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... Multiple alignment analysis revealed that CaDSIZ1 has high sequence similarity with the SIZ proteins of other species, including Arabidopsis AtSIZ1 and rice OsSIZ1 (Fig. S5a), which have been demonstrated to modulate different developmental processes, as well as stress responses. AtSIZ1 modulates phosphate deficiency (Miura et al., 2005), flowering time (Jin et al., 2008) and secondary cell wall formation (Liu et al., 2019), whereas OsSIZ1 has been found to play important roles in regulating vegetative growth and reproductive development in rice . Furthermore, OsSIZ1 is involved in modulation of the responses to phosphate and nitrogen (Wang et al., 2015). ...
... Crop management practices, such as planting techniques, plant growth regulator use, irrigation, and fertilization, are strongly associated with rice stem lodging. Additionally, environmental conditions like soil properties, temperature, CO2 and O3 levels, and shade can also significantly impact the incidence of lodging in rice [12][13][14][15][16][17][18][19][20][21][22]. Genetic traits including plant height, gravity center height, above-ground biomass, and stem strength are important for the stem lodging resistance of rice varieties [16,19,21,22]. ...
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