Przykłady xylem

• This may open the way to finding relatively distinct growth rings in the xylem of some evergreen species in these forests.

• The influence of these nematodes on cytokinins in the host's xylem exudate was not nearly so pronounced.

• In tangential section, preserved rays in the secondary xylem are relatively low (mean height: 86.9 m) compared to those of other specimens.

• But the same increase would double the food supply for a xylem-feeding insect.

• Most bark was eaten down to the xylem and the volume eaten was estimated from the mean bark thickness.

• The entire feeding areas were outlined, irrespective of depth, but feeding marks generally extended down to the xylem on the feeding substrate used.

• Secondary xylem ranges from 1.2 to 2 mm in thickness and is relatively evenly distributed around the primary strands.

• Features of the secondary xylem in radial section are not easily observed due to mineralization of the cell walls.

• As the tissues dehydrate, leaves shrink, chlorophyll is degraded, sucrose accumulates, the xylem cavitates eventually and the plants become desiccated.

• In transverse section, primary xylem strands rarely exceed 300 m in their smallest dimension and 2.5 mm in the largest.

• The second xylem element is of the dense, helicoidal type, which occurs in bundles comprised of numerous individuals, and remains active until maturity.

• Vascular bundles show a large number of xylem vessels of different diameter.

• Stomatal sensitivity to abscisic acid imported from the xylem sap.

• In particular, spittlebugs should be susceptible to manipulation of xylem transport solutes.

• Trends in wood density and structure are linked to prevention of xylem implosion by negative pressure.