Table I.

Developmental pattern of mesophyll cell production in the first leaf of unstressed wheat seedlings

TimeBlade LengthMeristematic Zone LengthMaximum Mitotic Index
dmm%
01.51.53.6  ± 0.3
1663.3  ± 0.3
21784.4  ± 0.7
33362.5  ± 0.5
44841.1  ± 0.5
56420.1  ± 0.1
67500
78100

Measurements started after 24 h of imbibition. The final blade length was reached on d 7. The ligule was present at d 3; therefore, only activity distal to this is recorded. The data are an average of four separate experiments. ses are given for the mitotic index. ses for the blade length are shown in Figure 1. The meristem length is rounded off to the nearest 0.5 mm.