New Phytologist181 (2009), 950–959.
Since its publication, the authors of Nagy et al. (2009) have become aware that Fig. 1(a) incorrectly shows the length of the root subsamples used to measure percentage colonization instead of total root length per pot. The corrected values are shown in the revised version of Fig. 1(a) printed here and correspond to the root dry weights in Supporting Information Fig. S1(b) in Nagy et al. (2009). Both figures reveal a similar relationship between root growth and different P conditions. In consequence, relationships between soil P level and colonization are similar irrespective of using root weight or root length as a basis. Total colonized root length was 95, 68 and 39 m for the three P levels and the corresponding values for root length with arbuscules were 65, 56 and 27 m.
Therefore, it still seems fair to conclude that root colonization and hyphal length density (HLD) are far less sensitive to increasing soil P than the specific activity of 33P.
We apologize to our readers for this mistake and are grateful for the comments of one attentive reader.