A recent study has demonstrated that the wrky12 A. thaliana mutants underwent secondary thickening in the walls of certain pith cells that were associated with the ectopic deposition of lignin, xylan and cellulose, leading to an approximately 50% increase in biomass density in stem tissues.
Note the endarch siphonostele, the position of pith, and secondary xylem that is separated into wedges by broad rays.
Light microscopy of transverse sections through these rhizome-like structures showed a pith and cortex tissue arrangement that is typical of rhizome anatomy (Fig. 3A).
In this species, green plastids of normal function are localized to a ring of cells between the stem pith and cortex that are isolated from atmospheric gas exchange, indicating photosynthesis may occur in this species using recycled respiratory CO2 [ 22] despite an altered xanthophyll cycle in its light-harvesting complex [ 23].
They have added pith to political debates that were once vague and windy.
After acid treatment, the morphological analysis of bagasse samples shows that the amount of pith was reduced considerably, which indicates that pith is less resistant to acid degradation than the fiber structures that prevail.
The central cavity, or lumen, of straw is lined by pith that covers parenchyma cells and that possesses mainly primary cell walls.
"People want more Britain, not less," he said, donning a pith helmet, "and that's what I am going to give them.
All of that is underlined by a slight bitterness from the orange pith, a flavor that might be echoed during the main dinner in your cranberry relish.
The role of DFAT in borer resistance, especially that of pith tissues, is well characterized [ 35, 36, 51, 71].
