The John Innes Centre Publications Repository contains details of all publications resulting from our researchers.

The repository also includes Open Access publications, which can be identified by the icons found on search results.

 Green open access publications are marked by the PDF icon. Click on the publication title, or the PDF icon, and read a pre-print PDF version of the publication.  Gold open access publications have the gold open padlock icon. You can read the full version of these papers on the publishing journal’s website without a subscription. 

The creation of this publications repository was funded by BBSRC.

Recent Publications

Abstract

Members of the Capnodiales class of fungi have evolved contrasting lifestyles on plants, ranging from biotrophy, through to endotrophy and necrotrophy. Many of these fungi contain homologs of the effector protein called Ecp2. The ‘currant’ tomato (Solanum pimpinellifolium) resistance (R) gene Cf-Ecp2 recognises Ecp2 produced by the pathogenic fungus, Cladosporium fulvum. In this study, Cf-Ecp2 was fine-mapped to the Orion locus, which contains eight Homologs of Cladosporium resistance gene Cf-9 (Hcr9s), four of which share 100% sequence identity within their open reading frame. The Cf-Ecp2 locus exemplifies the complex nature of many R gene loci brought about by successive rounds of tandem duplication. This extensive duplication renders R gene loci complex and difficult to resolve. As a consequence, the sequencing of a BAC minimal tiling path across the Cf-Ecp2 locus required use of both short read and long read sequencing technologies, with MinION providing vital scaffolding reads. A transposon mutagenesis experiment generated two deletion mutants. The mutants had lost the ability to recognise Ecp2 along with the OR2A (2A) gene from the Cf-Ecp2 locus. Wild-type tomato (Solanum lycopersicum) Cf0 stable transformants, overexpressing 2A via the cauliflower mosaic virus 35S promoter, partially recapitulated the S. pimpinellifolium CfEcp2 phenotype. Lack of penetrance of the phenotype in the transgenic plants was attributed to the functional interference of 2A overexpression. The non-host, Nicotiana paniculata TW99, also recognises Ecp2 from C. fulvum. N. paniculata CfEcp2 was characterised for its ability to recognise many homologs of Ecp2, including those from Mycosphaerella fijiensis (causal agent of Black Sigatoka on banana) and the wilt-  causing fungi, Fusarium oxysporum and Verticillium dahliae. The ability of Cf-Ecp2 to code for the recognition of an effector from many plant pathogens provides an exciting opportunity to engineer resistance to such pathogens in important crops. 
 

 Space?

Franceschetti M., Maqbool A., Maximiliano Jimenez Dalmaroni M. J., Pennington H. G., Kamoun S., Banfield M. J. (2017)

Effectors of Filamentous Plant Pathogens: Commonalities amid Diversity.

ID: 56025

read more

Martin A. C., Rey D. R., Shaw P., Moore G. (2017)

Dual effect of the wheat Ph1 locus on chromosome synapsis and crossover

Chromosoma (not yet available) not yet available

Publisher's version: 10.1007/s00412-017-0630-0

ID: 55894

read more

Abstract

Allopolyploids must possess a mechanism for fa- cilitating synapsis and crossover (CO) between homologues, in preference to homoeologues (related chromosomes), to en- sure successful meiosis. In hexaploid wheat, the Ph1 locus has a major effect on the control of these processes. Studying a wheat mutant lacking Ph1 provides an opportunity to explore the underlying mechanisms. Recently, it was proposed that Ph1 stabilises wheat during meiosis, both by promoting ho- mologue synapsis during early meiosis and preventing MLH1 sites on synapsed homoeologues from becoming COs later in meiosis. Here, we explore these two effects and demonstrate firstly that whether or not Ph1 is present, synapsis between homoeologues does not take place during the telomere bou- quet stage, with only homologous synapsis taking place dur- ing this stage. Furthermore, in wheat lacking Ph1, overall synapsis is delayed with respect to the telomere bouquet, with more synapsis occurring after the bouquet stage, when homoeologous synapsis is also possible. Secondly, we show that in the absence of Ph1, we can increase the number of MLH1 sites progressing to COs by altering environmental growing conditions; we show that higher nutrient levels in the soil or lower temperatures increase the level of both ho- mologue and homoeologue COs. These observations suggest opportunities to improve the exploitation of the Ph1 wheat mutant in breeding programmes.

JIC Cookie Policy. We use cookies on this site to enhance your user experience. By clicking any link on this page you are giving your consent for us to set cookies. You can find out more about the cookies by clicking here.

Accept cookies