Light microscopy images of transverse root-hypocotyl and stem sections of autumn squash plants grown in soil inoculated with A. cucurbitacearum. (a) Root-hypocotyl sections of a 30 day-old-plant showing the typical appearance of non-infected tissues, with green staining of the cellulose in the epidermal cells; (b) Root-hypocotyl sections of a 42 day-old-plant showing the formation of a superficial red-stained suberized layer in the epidermis (arrow); (c) Magnified view of the suberised epidermis (arrow) of the 42 day-old root-hypocotyl section; (d) Stem section of a 42 day-old plant grown in infected soil with a healthy appearance. ep: epidermis
The root-hypocotyl tissues of infested autumn squash seedlings
grown in infested soil showed a healthy appearance after
30 days (Fig. 3 a).
A slightly suberised layer was observed in the epidermis by day 42
(Fig. 3 b, c, arrows), some 10 days later than in
The stems of the infected autumn squash plants did not show any
sign of damage throughout the period of study (Fig. 3 d). .
cucurbitacearum infection, since in the soil-growing plants
symptoms developed earlier and were more intense in this species
than in autumn squash (Figs. 2 and 3 ).
Under the relatively mild infection conditions we used in the
potted plant experiment, the autumn squash seedlings showed only
modest suberin deposition in the cells beneath the epidermis after
42 days in culture (Fig. 3 ), which demonstrates slower
fungal colonisation than in muskmelon.
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