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. 2018 Nov 9;30(12):3058–3073. doi: 10.1105/tpc.18.00283

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Figure 7. — Schematic Representation of the P. brassicae-Driven Developmental Phloem Reprogramming and Stimulation of Sucrose Transport to Pathogen-Colonized Cells.

P. brassicae infection triggers critical reprogramming of the early phloem differentiation related genes (OPS, BRX, and CVP2). Transcriptional changes lead to an increase of phloem bundle complexity influencing the host–pathogen interaction. Proliferated phloem bundles are the site of intense SWEET11 and SWEET12 sugar permease expression, facilitating efficient redirection of sugars toward the pathogen site. Accumulation of SWEETs enable the pathogen to usurp the host assimilate. PPC, phloem precursor cells; SE, sieve element cells; CC, companion cells; SC, sink cells; Pb, P. brassicae.