The comparison on leaf morphology and anatomy of two invasive plant of Galinsoga
The genus Galinsoga belongs to the tribe Heliantheae of Asteraceae and comprises 2 species of annual herbs distributed in China. Two species of the genus are found in Liaoning were anatomically studied. The indices investigated were leaf length, leaf width, leaf perimeter,leaf area, leaf length/leaf width,leaf index,specific leaf weight,leaf epidermal thickness,leaf palisade parenchyma thickness(P) , leaf spongy parenchyma thickness(S), P/S, leaf stomatal density, stomatal index and stomatal area. The result shows:G. parviflora and G. quadriradiata showed large differences in the single leaf area, the difference was very significant (P<0. 01), however, there were not different in the aspect ratio, leaf index and dry weight of single leaf and specific leaf weight between G. parvi flora and G. quadriradiata. The characters of leaf epidermis are fairly similar in the shades of surface cells, the types and position of stomata apparatus between G. parviflora and G. quadriradiata. The leaf epidermal cells are irregular in shape with the undulate anticlinal walls. The stomata of 2 species of Galinsoga,occur on both sides of the leaf but are more numerous on the lower surface, the difference was very significant (P<0. 01). The guard cells in the genus Galinsoga are crescent-shaped and the type of stomata apparatus is anomocytic. The upper epidermis and the lower epidermis consist of one layer cell. The thickness of upper epidermis is more than the other side of it, the difference was significant (P<0. 05). The mesophyll of these two species were differentiated into spongy parenchyma and palisade parenchyma. There is a vascular bundle in the midrib. G. parviflora and G. quadriradiata belongs to C3 plant.
NETL
NSTL
万方数据
维普
