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. 2008 Dec 8;105(50):20032–20037. doi: 10.1073/pnas.0805617106

Fig. 4.

Fig. 4.

pBpCRE1::AtCKX2 poplars have a reduced number of cambial cells. (A) Cross sections of WT, line 7, and line 11 stem. The stem thickness and internode number at the section site are indicated. The cambial cell file is indicated with dots. The number of undifferentiated cambial cells (marked between asterisks) per cell file is reduced in lines 7 and 11 compared with WT (see text for details). (Scale bar: 0.2 mm [0.1 mm in Insets].) (B) Number of undifferentiated cambial cells was reduced in the thin-stemmed pBpCRE1::AtCKX2 lines. Frequency distributions of cell numbers in cambial cell files in the 20th WT internode (Ø 7.3 mm) and in internodes of pBpCRE1::AtCKX2 lines 7 and 11 of the same position (20th from the apex) or the same diameter (Ø 7.3 mm) are shown (n = 100 cambial files, data from 50 files from 2 separate trees combined). The difference in distributions was statistically significant (P < 0.001) between WT and pBpCRE1::AtCKX2 lines.