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

Fig. 2.

Fig. 2.

Localization of RR4 expression in pea nodule primordia and 2-week-old nodules expressing a pMtRR4::GUS genetic construct. (A, B) Nodule primordia; pMtRR4::GUS expression is visible in the pericycle and inner cortical cells of composite SGE pea wild-type plants. (C, D) Two-week-old pea nodules. Cytokinin response is stimulated in nodule primordia and in the meristem, infection zone and apical part of the nitrogen fixation zone of 2-week-old pea nodules. I, meristem zone; II, infection zone; III, nitrogen fixation zone; arrows indicate vascular bundles. Scale bars are 50 µm (A, B), 100 µm (C) and 75 µm (D).