Adventitious roots are absent in the specimens and stem sections of Yiduxylon, the outer cortex is Sparganum-type, and the angle of frond attachment is not so wide, whereas the stem diameter is generally less than 20 mm and the complex fronds consist of two orders of long pinnae with many large pinnules.
In stem sections of this species, we have analyzed the cell walls of nonarticulated laticifers and surrounding cells with various stains, lectins, and monoclonal antibodies.
Selected plants were harnessed at day 2 in orbit, with stem sections of specific plants harvested and fixed for subsequent microscopic analyses on days 8, 10 and 15.
Open image in new window Figure 4 Ultrathin stem sections of E. canadensis.
In order to determine the diameter of the stem section being measured by the robot's transducers at each measurement point, moving averages of differing lengths were made from the Silviscan MFA, MOE, and air-density data at each USV measurement point.
The stem section included both necrotic and green tissue with the advancing lesion front located in the center of the section.
The total number of primary phloem fibres in the stem cross-sections of 67-day-old plants sharply increased from 1556 ± 201 at 10 mm from the SAM up to 6118 ± 392 at a distance of 60 mm from the SAM (Table 1).
The smallest classes possess the highest proportion of bark, reaching maximum values of over 70%% of total dry biomass in stem sections at diameters of up to 1 cm.
The index was determined for each plant by considering the presence or absence of the fungus in the pairs of subsequent stem sections and assigning a value of 1 when the fungus was reisolated or not reisolated in both sections and a value of 0 when it was reisolated only in one of the two sections.
There was a striking decrease in staining of the amiR-comt4 stem sections, in which the majority of tissue stained pale brown in color, with slight purple coloration seen in the outer regions of the pith.
