@article{fdi:010073623, title = {{C}ell remodeling and subtilase gene expression in the actinorhizal plant {D}iscaria trinervis highlight host orchestration of intercellular {F}rankia colonization}, author = {{F}ournier, {J}. and {I}manishi, {L}. and {C}habaud, {M}. and {A}bdou-{P}avy, {I}. and {G}enre, {A}. and {B}richet, {L}. and {L}ascano, {H}. {R}. and {M}unoz, {N}. and {V}ayssieres, {A}. and {P}irolles, {E}. and {B}rottier, {L}aurent and {G}herbi, {H}assen and {H}ocher, {V}al{\'e}rie and {S}vistoonoff, {S}ergio and {B}arker, {D}. {G}. and {W}all, {L}. {G}.}, editor = {}, language = {{ENG}}, abstract = {{N}itrogen-fixing filamentous {F}rankia colonize the root tissues of its actinorhizal host {D}iscaria trinervis via an exclusively intercellular pathway. {H}ere we present studies aimed at uncovering mechanisms associated with this little-researched mode of root entry, and in particular the extent to which the host plant is an active partner during this process. {D}etailed characterization of the expression patterns of infection-associated actinorhizal host genes has provided valuable tools to identify intercellular infection sites, thus allowing invivo confocal microscopic studies of the early stages of {F}rankia colonization. {T}he subtilisin-like serine protease gene {D}t12, as well as its {C}asuarina glauca homolog {C}g12, are specifically expressed at sites of {F}rankia intercellular colonization of {D}.trinervis outer root tissues. {T}his is accompanied by nucleo-cytoplasmic reorganization in the adjacent host cells and major remodeling of the intercellular apoplastic compartment. {T}hese findings lead us to propose that the actinorhizal host plays a major role in modifying both the size and composition of the intercellular apoplast in order to accommodate the filamentous microsymbiont. {T}he implications of these findings are discussed in the light of the analogies that can be made with the orchestrating role of host legumes during intracellular root hair colonization by nitrogen-fixing rhizobia.}, keywords = {actinorhizas ; apoplastic remodeling ; {D}iscaria trinervis ; endosymbiotic infection ; {F}rankia ; intercellular colonization ; nitrogen fixation ; subtilisin-like serine protease}, booktitle = {}, journal = {{N}ew {P}hytologist}, volume = {219}, numero = {3}, pages = {1018--1030}, ISSN = {0028-646{X}}, year = {2018}, DOI = {10.1111/nph.15216}, URL = {https://www.documentation.ird.fr/hor/fdi:010073623}, }