Cross section of Arabidopsis thaliana hypocotyl showing xylem tissue patterning formed by two different cell types – xylem vessels (red) and xylem parenchyma cells. SR2200 and Fuchsin staining of ...

Cross section of hypocotyl of 8-week-old Arabidopsis thaliana. The ovac mutant displays enhanced secondary vessel differentiation (red) at the expense of parchenchyma cells. Images A2 and B2 show the ...

Towering redwoods and lanky jungle vines hoist water from the soil to their lofty leaves through a tubelike tissue called the xylem. In early plants, which reached just a few centimeters and lived ...