Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: spur anatomy

Sortuj według:

Ogranicz wyniki do:

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

The structure of the spur nectary in Dendrobium finisterrae Schltr. (Dendrobiinae, Orchidaceae)

100%

Kaminska M., Stpiczynska M.

Acta Agrobotanica

2011

tom 64

nr 1

To date, the structure of the nectary spur of Dendrobium finisterrae has not been studied in detail, and the present paper compares the structural organization of the floral nectary in this species with the spurs of other taxa. The nectary spur of D. finisterrae was examined by means of light microscopy (LM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). It is composed of a single layer of secretory epidermis and several layers of small and compactly arranged subepidermal secretory cells. The secretory cells have thick cellulosic cell walls with primary pits. The secretory tissue is supplied by vascular bundles that run beneath in ground parenchyma and are additionally surrounded by strands of sclerenchymatous fibers. The flowers of the investigated species displayed morphological features characteristic of bee-pollinated taxa, as they are zygomorphic, creamy-green coloured with evident nectar guides. They also emit a weak but nice scent. However, they possess some characters attributed to bird-pollinated flowers such as a short, massive nectary spur and collenchymatous secretory tissue that closely resembles the one found in the nectaries of certain species that are thought to be bird-pollinated. This similarity in anatomical organization of the nectary, regardless of geographical distribution and phylogeny, strongly indicates convergence and appears to be related to pollinator-driven selection.

Comparative anatomy of the lip spur and additional lateral sepal spurs in a three-spurred form [F. fumeauxiana] of Anacamptis pyramidalis

100%

Kowalkowska A. K., Margonska H. B., Kozieradzka-Kiszkurno M.

Acta Biologica Cracoviensia. Series Botanica

2010

tom 52

nr 1

13-18

Anacamptis pyramidalis shows great phenotypic variability. Additional lateral sepal spurs were observed in f. fumeauxiana. We used light and scanning electron microscopy to examine the anatomy of the lip spur and additional lateral sepal spur(s). The spurs have the same anatomical structure. We describe the features of the inner and external epidermis, report the presence of an appendix at the base of the additional spur, and discuss the evolutionary context.

Ograniczanie wyników

1 Acta Agrobotanica

1 Acta Biologica Cracoviensia. Series Botanica

1 Kaminska M.

1 Kowalkowska A. K.

1 Kozieradzka-Kiszkurno M.

1 Margonska H. B.

1 Stpiczynska M.

1 2011

1 2010

Wyniki wyszukiwania

The structure of the spur nectary in Dendrobium finisterrae Schltr. (Dendrobiinae, Orchidaceae)

Comparative anatomy of the lip spur and additional lateral sepal spurs in a three-spurred form [F. fumeauxiana] of Anacamptis pyramidalis