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. 2022 Oct 20;13:1038684. doi: 10.3389/fpls.2022.1038684

Figure 4.

Figure 4

Early resistance stages of wild Helianthus species phenotyped in rhizotron using the broomrape race E-BOU. (A–C) Attachments at 14 dai. (A) Compatible attachments, accession #826 H. annuus (rhizotron non-treated). (B) Incompatible attachments, accession #783 H. divaricatus (arrow heads). (C) Mix of incompatible (arrowhead) and compatible attachments (double arrowhead), accession #761 H. petiolaris. (D–F). Tubercles at 21 dai. (D) High number of tubercles, accession #774 H. annuus. (E) Absence of tubercles, accession #2601 H. exilis. (F) Low number of tubercles, accession #736 H. petiolaris. (G–I) Necrotic tubercles at 28 dai (examples indicated by arrows). (G) Absence of necrotic tubercles, accession #774 H. annuus (rhizotron non-treated). (H) Low percentage of necrotic tubercles, accession #677 H. praecox. (I) High percentage of necrotic tubercles, accession #786 H. debilis. A–C. Bar = 1 mm. D–I. Bar = 1 cm. All pictures were taken from rhizotrons treated with GR24+ DCL, except for Figures 4A and G taken from non-treated rhizotrons.