Abstract
DV, displacement velocity GA3, gibberellic acid REGR, relative elemental growth rate XET, xyloglucan‐endotransglycosylase Recently Schünmann et al. (1997; Plant, Cell and Environment 20, 1439–1450) investigated the correlation of spatial patterns of xyloglucan‐endotransglycosylase (XET) activity, XET‐related mRNAs, and growth in elongating barley (Hordeum vulgare L.) leaves. Here, methodological difficulties in the kinematic growth analysis are discussed, and it is concluded that the role that XET‐related gene activity plays in the control of spatial growth patterns remains undetermined.
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