Fig. 6

Histological characteristics of the leaves of the mock and infected resistant and susceptible cultivars at the tillering stage (Z21) under transmission electron microscopy. a Mesophyll cell structure of the mock resistant cultivar. b Mesophyll cell structure of the infected resistant cultivar. c Mesophyll cell structure of the mock susceptible cultivar. d Mesophyll cell structure of the infected susceptible cultivar. e Nucleus of the mock resistant cultivar. f Nucleus of the infected resistant cultivar. g Nucleus of the mock susceptible cultivar. h Nucleus of the infected susceptible cultivar. i Chloroplast of the mock resistant cultivar. j Chloroplast of the infected resistant cultivar. k Chloroplast of the mock susceptible cultivar. l Chloroplast of the infected susceptible cultivar. The resistant cultivar was Mianyang 26/Yumai 47, and the susceptible cultivar was CU42. Black arrows in (a-d) indicate mesophyll cells, black arrows in (e-h) indicate leaf nuclei, and black arrows in (i-l) indicate leaf chloroplasts (N: Nucleus; CHl: Chloroplast; St: Starch granule; M: Mitochondrion; scale bar of (a-d) =20 μm; scale bar of (e-l) =1 μm)