Fig. 5.

Nodulation in wild-type, ein2, lk and lk ein2 double mutant plants. Plants were grown under nitrate-free conditions for 35 days. (A) Photograph of whole plants, including shoot height (length between nodes 1 and 9 in cm; scale bar=5cm). (B) Number of nodules per g dry weight of roots. (C) Average space between nodules. (D) Photograph of nodules on a secondary root of wild-type, ein2, lk, and lk ein2 plants (tertiary roots have been removed; scale bar=1cm). For A *** P<0.001; for B and C, values with different letters above the bars indicate differences at P<0.05. Values are mean±SE (n=6). (This figure is available in colour at JXB online.)