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. 2020 Mar 21;125(6):905–923. doi: 10.1093/aob/mcaa022

Fig. 3.

Fig. 3.

Localization of RR4 expression in pea nodules of the wild type and mutants expressing the pMtRR4::GUS construct 2 weeks after inoculation. (A) Two-week-old SGE pea nodules. (B) sym33-3 mature nodule. pMtRR4::GUS expression is detected in peripheral tissues including vascular bundles. (C) sym33-2 mature nodule. (D) sym40. I, meristem zone; II, infection zone; II', infection thread propagation zone; III, nitrogen fixation zone; arrows indicate vascular bundles. Scale bars are 100 µm (A, B, D) and 50 µm (C).