- Tytuł:
- Ontogenetic development of storied ray pattern in cambium of Hippophae rhamnoides L.
- Autorzy:
-
Myskow, E
Zagorska-Marek, B. - Powiązania:
- https://bibliotekanauki.pl/articles/58338.pdf
- Data publikacji:
- 2004
- Wydawca:
- Polskie Towarzystwo Botaniczne
- Tematy:
-
storied ray
cambium
plant development
storied pattern
Hippophae rhamnoides
morphology
ray - Opis:
- Storied pattern, in the arrangement of both fusiform initials and the rays in cambium of Hippophae rhamnoides, develops in ontogeny relatively quickly and becomes clearly visible in terminal parenchyma of third and fourth annual ring. At first, anticlinal longitudinal divisions and restricted intrusive growth of fusiform initials lead to the formation of their characteristic horizontal tiers. Then, initiation of secondary rays, taking place rather within such tiers, not between them, makes possible the formation of storied ray pattern. New secondary rays originate most frequently from fusiform initials by their segmentation. This makes the appearance of ray tiers rather quick. However, the high order in the structure of cambium of Hippophae rhamnoides is also due to another, very curious and not known until now mechanism. It operates through limited in its range, thus highly controlled, vertical migration of rays on the cambial surface. This applies to asymmetrically positioned rays either primary, which are often originally sited "out of order" or secondary, initiated off-centre within the existing tiers. Excessively asymmetric rays, lying accidentally on the border between two neighbouring storeys, often undergo splitting and then the derivative rays move toward the centres of the storeys. Ray displacement is due to elimination of one or two of ray initial cells on one edge of the ray and simultaneous, multiple divisions adding new ray cells on the opposite edge.
- Źródło:
-
Acta Societatis Botanicorum Poloniae; 2004, 73, 2
0001-6977
2083-9480 - Pojawia się w:
- Acta Societatis Botanicorum Poloniae
- Dostawca treści:
- Biblioteka Nauki
Artykuł