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Mar 21
New MPMI Editor's Pick Announced!

Increasingly, new evidence is revealing variability in the epitope regions of bacterial flagellin, including in regions harboring the microbe-associated molecular patterns flg22 and flgII-28 that are recognized by the pattern recognition receptors. Learn more from Maria Malvino and colleagues in their paper "Influence of Flagellin Polymorphisms, Gene Regulation, and Responsive Memory on the Motility of Xanthomonas Species That Cause Bacterial Spot Disease of Solanaceous Plants."

Dec 20
In Case You Missed It—Editor's Picks from Recent Issues of MPMI

September

The Natural Antisense Transcript DONE40 Derived from the lncRNA ENOD40 Locus Interacts with SET Domain Protein ASHR3 during Inception of Symbiosis in Arachis hypogaea

Pritha Ganguly, Dipan Roy, Troyee Das, Anindya Kundu, Fabienne Cartieaux, Zhumur Ghosh, and Maitrayee DasGupta

The long noncoding RNA ENOD40 is required for cortical cell division during root nodule symbiosis (RNS) of legumes, although it is not essential for actinorhizal RNS. Ganguly et al. set out to understand whether ENOD40 is required for aeschynomenoid nodule formation in Arachis hypogaea. AhENOD40 expresses from chromosomes 5 (AhENOD40-1) and 15 (AhENOD40-2) during symbiosis, and RNA interference by these transcripts drastically affects nodulation, indicating the importance of ENOD40 in A. hypogaea.

​Metatranscriptomic Comparison of Endophytic and Pathogenic Fusarium–Arabidopsis Interactions Reveals Plant Transcriptional Plasticity​

Li Guo, Houlin Yu, Bo Wang, Kathryn Vescio, Gregory A. DeIulio, He Yang, Andrew Berg, Lili Zhang, Véronique Edel-Hermann, Christian Steinberg, H. Corby Kistler, and Li-Jun Ma​

Two strains of the fungus Fusarium oxysporum (Fo) share a core genome, but one is a beneficial endophyte while the other is a detrimental pathogen causing wilt and death. Guo et al. ​tried to tease apart why these two strains cause such opposite reactions, and more generally how plants respond differently to useful and harmful microbes, by exploring the interaction of these two strains with the model plant Arabidopsis.

October

Chitin Deacetylases Are Required for Epichloë festucae Endophytic Cell Wall Remodeling during Establishment of a Mutualistic Symbiotic Interaction with Lolium perenne

Nazanin Noorifar, Matthew S. Savoian, Arvina Ram, Yonathan Lukito, Berit Hassing, Tobias W. Weikert, Bruno M. Moerschbacher, and Barry Scott

A diverse set of microbes survives and thrives inside plants as endophytes, but we have little mechanistic understanding of these intimate associations. In their study, Noorifar et al. show the way in which an Epichloë endophyte remodels its cell wall, converting chitin to chitosan, to avoid detection by host defenses. Deletion mutants reveal an important role for chitin deacetylases in hyphal growth inside the plant.

November

Computational Structural Genomics Unravels Common Folds and Novel Families in the Secretome of Fungal Phytopathogen Magnaporthe oryzae

Kyungyong Seong and Ksenia V. Krasileva

Recent breakthroughs in protein structure modeling demonstrate the ability to predict protein folds without depending on homologous templates. In their study, Seong and Krasileva employed structure prediction methods on the secretome of the destructive fungal pathogen Magnaporthe oryzae. Out of 1,854 secreted proteins, they predicted the folds of 1,295 proteins (70%).

Mar 29
A Novel Role of Salt- and Drought-Induced RING 1 Protein in Modulating Plant Defense Against Hemibiotrophic and Necrotrophic Pathogens

​Many plant-encoded E3 ligases are known to be involved in plant defense. Ramu et al. report a novel role of E3 ligase SALT- AND DROUGHT-INDUCED RING FINGER1 (SDIR1) in plant immunity. Their research suggests that SDIR1 is a susceptibility factor and its activation or overexpression enhances disease caused by P. syringae pv. tomato DC3000 in Arabidopsis. 


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Mar 04
Distinct Transcriptomic Reprogramming in the Wheat Stripe Rust Fungus During the Initial Infection of Wheat and Barberry

​Puccinia striiformis f. sp. tritici is the causal agent of wheat stripe rust that causes severe yield losses all over the world. Zhao et al. represent the first analysis of the P. striiformis f. sp. tritici transcriptome in barberry and contribute to a better understanding of the evolutionary processes and strategies of different types of rust spores during the infection process on different hosts.​

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Jan 29
Tobacco Necrosis Virus-AC Single Coat Protein Amino Acid Substitutions Determine Host-Specific Systemic Infections of Nicotiana benthamiana and Soybean

Zongyu Gao and colleagues use alanine scanning of the Tobacco necrosis virus-A coat protein to identify 3 amino acid residues that differentially affect movement of the virus through the plant in tobacco and soybean, as well as identifying host specific interactions of the HSP70 protein Hsc70-2 with the coat protein to mediate systemic infection.





Dec 14
Sec-Delivered Effector 1 (SDE1) of ‘Candidatus Liberibacter asiaticus’ Promotes Citrus Huanglongbing

Clark and colleagues investigate the role of the Liberibacter effector SDE1, finding that it promotes colonization by Liberibacter, the causative agent of citrus greening disease, or huanglongbing, likely by inducing premature senescence responses in leaves.


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Nov 12
Extensive Genetic Variation at the Sr22 Wheat Stem Rust Resistance Gene Locus in the Grasses Revealed Through Evolutionary Genomics and Functional Analyses
Wheat stem rust, a previously well-controlled disease, has reemerged as a major threat to wheat, with major outbreaks in Africa, Europe, and central Asia. The stem rust resistance gene Sr22 encodes a nucleotide-binding and leucine-rich repeat receptor, which confers resistance to the highly virulent African stem rust isolate, Ug99. Hatta et al. show that the Sr22 gene is conserved among grasses in the Triticeae and Poeae lineages.​

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Oct 11
Bacillus pumilus LZP02 Promotes Rice Root Growth by Improving Carbohydrate Metabolism and Phenylpropanoid Biosynthesis

​Liu et al. explored the mechanism by which Bacillus pumilus LZP02 promotes growth in rice roots through proteomic, transcriptomic, and metabolomic techniques. The results indicated ​that B. pumilus LZP02 promoted the growth of rice roots by enhancing carbohydrate metabolism and phenylpropanoid biosynthesis.







Sep 22
Structural Requirements of the Phytoplasma Effector Protein SAP54 for Causing Homeotic Transformation of Floral Organs

Phytoplasmas are intracellular bacterial plant pathogens that cause devastating diseases in crops and ornamental plants through the secretion of effector proteins. One of these effector proteins, termed SAP54, leads to the degradation of a specific subset of floral homeotic proteins of the MIKC-type MADS-domain family via the ubiquitin-proteasome pathway. Aurin et al. report that, based on biophysical and molecular biological analyses, SAP54 folds into an alpha-helical structure.

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Aug 25
Dual Role of Auxin in Regulating Plant Defense and Bacterial Virulence Gene Expression During Pseudomonas syringae PtoDC3000 Pathogenesis

Djami-Tchatchou et al. find that auxin accumulation during infection by Pseudomonas syringae PtoDC3000 alters the interaction between plant and microbe, inhibiting Salicylic acid production in the plant, thus reducing defenses, and modulating bacterial gene expression, promoting a transition from genes needed in early infection to those required during mid-infection.





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