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Effect of down-regulation of IbEXP1 on cell proliferation in fibrous roots. Transverse sections of fibrous roots were prepared from in vitro cultured sweetpotato plants at 10 d after planting. The right panel is an enlarged image of the left panel. Numbers #1 and #2 represent IbEXP1-antisense sweetpotato lines #1 and #2, respectively. Scale bars: 200 µm. MPH, metaphloem; MX, metaxylem; PC, primary cambium; WT, wild type. (This figure is available in colour at JXB online.)
