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Endogenous overexpression of Poplar MYB186 increases trichome density, improves growth rate and insect pest resistance

ABSTRACT: Trichomes are specialised epidermal cells that generally play a role in reducing transpiration and act as a deterrent to herbivory. In a screen of activation tagged Populus tremula x P. alba 717-1B4 trees, we identified a mutant line, fuzzy, with increased foliar trichome density. This mutant also had a 35% increase in growth rate and a 200% increase in the rate of photosynthesis as compared to wild-type poplar. The fuzzy mutant had significant resistance to feeding by larvae of the white spotted tussock moth (Orgyia leucostigma), a generalist insect pest of poplar trees. The fuzzy phenotype is attributable to activation tagging and increased expression of the gene encoding PtaMYB186, which is related to Arabidopsis thaliana MYB106, a known regulator of trichome initiation. The fuzzy phenotype can be recapitulated by overexpressing PtaMYB186 in poplar. PtaMYB186 overexpression results in reconfiguration of the poplar transcriptome, with changes in the transcript abundance of suites of genes that are related to trichome differentiation. It is notable that this gene responsible for trichome development also altered traits related to growth rate and pest resistance, suggesting that non-intuitive facets of plant development might be useful targets for plant improvement.

ORGANISM(S): Populus tremula x Populus alba Populus sp.

PROVIDER: GSE21061 | GEO | 2010/09/01

SECONDARY ACCESSION(S): PRJNA126751

REPOSITORIES: GEO

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Endogenous overexpression of Poplar MYB186 increases trichome density, improves growth rate and insect pest resistance

Project description:Trichomes are specialised epidermal cells that generally play a role in reducing transpiration and act as a deterrent to herbivory. In a screen of activation tagged Populus tremula x P. alba 717-1B4 trees, we identified a mutant line, fuzzy, with increased foliar trichome density. This mutant also had a 35% increase in growth rate and a 200% increase in the rate of photosynthesis as compared to wild-type poplar. The fuzzy mutant had significant resistance to feeding by larvae of the white spotted tussock moth (Orgyia leucostigma), a generalist insect pest of poplar trees. The fuzzy phenotype is attributable to activation tagging and increased expression of the gene encoding PtaMYB186, which is related to Arabidopsis thaliana MYB106, a known regulator of trichome initiation. The fuzzy phenotype can be recapitulated by overexpressing PtaMYB186 in poplar. PtaMYB186 overexpression results in reconfiguration of the poplar transcriptome, with changes in the transcript abundance of suites of genes that are related to trichome differentiation. It is notable that this gene responsible for trichome development also altered traits related to growth rate and pest resistance, suggesting that non-intuitive facets of plant development might be useful targets for plant improvement. 6 arrays total. 2 genotypes – WT, FUZZY – PtaMYB186 OE

2010-09-01 | E-GEOD-21061 | biostudies-arrayexpress

Arabidopsis thaliana trichome proteome

Project description:Trichomes of Arabidopsis thaliana have been broadly used to study cell development, cell differentiation and cell wall biogenesis. In this context, the exposed position, extraordinary size and characteristic morphology of trichomes featured particularly the exploration of trichome mutant phenotypes. However, trichome-specific biochemical or -omics analyses require a proper separation of trichomes from residual plant tissue. Thus, different strategies were proposed in the past for trichome isolation, which mostly rely on harsh conditions. To improve trichome-leaf separation, we revised a previously proposed method for isolating A. thaliana trichomes by optimizing the mechanical and biochemical specifications for trichome release. Furthermore, we introduced a density gradient centrifugation step to remove residual plant debris. We found that prolonged, yet mild seedling agitation increases the overall trichome yield by about 62% compared to the original protocol. We noticed that subsequent density gradient centrifugation further visually enhances trichome purity, which could be advantageous for downstream analyses. Histochemical and biochemical investigation of trichome cell wall composition indicated that gentle agitation during trichome release largely preserves trichome integrity. We used enriched and purified trichomes for proteomic analysis and present a reference data set of trichome-resident and -enriched proteins.

2022-01-13 | PXD028808 | Pride

Short trichome comparative genomic hybridization analysis in glycine max fast neutron mutants

Project description:One short trichome mutant (family known by multiple names, including R59C46, FN0175946, and FNMN0409) was identified in a soybean fast neutron population (known as VP02 in Bolon et al. 2011). An advanced line of this mutant was compared to its wild-type parent (M92-220-Long) using CGH to identify the causative region/gene associated with the short trichome phenotype.

2018-08-08 | GSE118251 | GEO

Effect of MiSSP7 overexpression on the Poplar root transcriptome

Project description:The Poplar transcriptome was analyzed in Populus tremulaxPopulus alba clone 717-1B4 control roots and in two poplar lines overexpressing MiSSP7.

2014-04-17 | GSE56863 | GEO

Different gene expression in the tomato trichome and leaf

Project description:We report the transcriptome difference between glandular cells of type VI trichome and leaf cells of trichome shaved leaf.

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Populus tremula x Populus alba

Project description:Endogenous overexpression of Poplar MYB186 increases trichome density, improves growth rate and insect pest resistance

| PRJNA126751 | ENA

Effect of MiSSP7 overexpression on the Poplar root transcriptome

Project description:The Poplar transcriptome was analyzed in Populus tremulaxPopulus alba clone 717-1B4 control roots and in two poplar lines overexpressing MiSSP7. We performed 9 hybridizations (NimbleGen) with samples derived from Populus tremulaxPopulus alba clone 717-1B4 control roots, as well as from roots of LINE1 and LINE2 MiSSP7 overexpressor poplars (3 biological replicates each). All samples were labeled with Cy3.

2014-04-17 | E-GEOD-56863 | biostudies-arrayexpress

Transcriptome profiling reveals roles of meristem regulators and polarity genes during multicellular fruit trichome development in cucumber (Cucumis sativus L.).

Project description:Trichomes are the hair-like structures that are widely present on the surface of aerial organs and function in plant defense against biotic and abiotic stresses. Previous studies focus on the single cell trichomes in Arabidopsis and cotton, or multicellular glandular trichomes in tomato, but the developmental process and molecular mechanisms controlling multicellular non-glandular trichome development are largely neglected. Here, we extensively characterized the fruit trichome (spine) development in wild type cucumber and in a tiny branched hair (tbh) mutant that contains a spontaneous mutation and has hairless foliage and smooth fruit surface. Our data indicated that cucumber trichome was multicellular and non-glandular, with no branches or endoreduplication. Further, the major feature of cucumber trichome development was spine base expansion. Transcriptome profiling through Digital Gene Expression indicated that meristem-related genes and transcription factors were implicated in the fruit spine development, and polarity regulators were upregulated during spine base expansion. qRT-PCR verified the reliability of our RNA-SEQ data, and in situ hybridization confirmed the enriched expression of meristem regulators CUP-SHAPED COTYLEDON3 (CUC3) and STM (SHOOT MERISTEMLESS) , as well as the abaxial identity gene KANADI (KAN) in cucumber fruit spine. Together, our results suggest a distinct regulatory pathway involving meristem genes and polarity regulators in multicellular trichome development in cucumber.

2014-07-01 | GSE49607 | GEO

Transcription profiling of Arabidopsis gl3-sst trichome cells

Project description:Transcriptional profiling of isolated gl3-sst trichome cells.

2009-02-03 | E-MEXP-2009 | biostudies-arrayexpress

Hormetic response and transcriptome profiling reveal the mechanism underlying metabolic and cuticular resistance to host-specific terpenoid defenses in an emerging insect pest, Pagiophloeus tsushimanus (coleoptera: curculionidae)

Project description:The resistance mechanisms evolved by insects to overcome host-plant allelochemicals is a key consideration in pest management. Camphor oil (EO) and its main component (i.e D-camphor) form a specific terpenoid-defensive system in camphor trees, Cinnamomum camphora. However, an emerging insect pest, Pagiophloeus tsushimanus has recently caused serious damage to this intractable plant species, which is largely elusive. Here, we used feeding bioassays and RNA-seq to investigate the mechanism underlying the resistance of the beetle to host-specific terpenoid defenses. Firstly, a hormetic response in both larval weight and developmental time was observed in terpenoid-feeding individuals, which is a highly generalized dose-response phenomenon in toxicology whereas occurs infrequently in the context of insect-plant interactions. Then, comparative transcriptome analysis between terpenoid-feeding and control groups indicated that both CYP450s-mediated metabolic resistance and CPs-mediated cuticular resistance were jointly employed to cope with terpenoid-induced stress. In addition, a small portion of genes involved in glucose transport pathway were up-regulated at the low D-camphor dose, suggesting an extra intake of glucose used for larval growth may contribute to a hormetic response. These findings probably implied that the dual terpenoid-resistance mechanisms existing in this specialist is an essential precondition for hormetic response in larval growth, ultimately contributing to successfully colonize host camphor trees with impunity. Overall, our study will open new avenues for understanding the insect-plant coevolutionary adaptation and developing durable pest control strategies.

2021-08-21 | GSE182420 | GEO

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