|
Angiosperms (7636 words) |
 | Periderm, the term first used by von Mohl (1845), is a protective tissue of secondary origin which replaces the epidermis in stems and roots that have continual secondary growth. |
| As trees age, sequent periderms may arise at successively greater depths thus causing an accumulation of dead tissues on the surface of the stem or root and contributing to the formation of rhytidome on rough-barked species or simply outer bark on smooth-barked species. |
| In angiosperms, wound periderms are distinct from the first periderms based on their dissimilar histochemical reactions to lignin reagents (Biggs 1984b, Rittinger et al 1987) and the formation of a ligno-suberized boundary as a prerequisite to barrier differentiation (Mullick 1997, Soo 1977, Biggs 1984a,b). |
| Immunocytological Comparison of Native and Wound Periderm Maturation in Potato Tuber American Journal of Potato ... (861 words) |
| In contrast, as we previously described, native periderm maturation and resistance to excoriation (skinning) is accompanied by an increase in relatively un-esterifled and esterified homogalacturonan pectin epitopes in the walls of phellogen cells. |
| In native tuber periderm, the phellogen layer differentiates from the hypodermis early during development of the tuber (Artschwager 1924; Peterson and Barker 1979). |
| As is the case with native periderm, an immature wound periderm is susceptible to excoriation. |
Feeds |
Contact