Structural organization of epidermis in leaves of extant species of Gnetum L. (Gnetales) and Middle Jurassic Bennettitales

Q3 Agricultural and Biological Sciences
I. Bogdanova, L. Kartseva
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Abstract

An attempt to assess the identification and evaluation of correlations between the epidermal characters of leaves in Bennettitales and the comparison of the results with the structural organization of leaves of extant plants has been carried out. Epidermis of four species of Gnetum L. and four species of Jurassic Bennettitales (Nilssoniopteris Nathorst and Ptilophyllum Morris) was studied. The coefficients of variation for epidermal characters Gnetum range from 6.4 to 24.0 %, Ptilophyllum — 15.7–63.5 % and Nilssoniopteris — 18.0–39.9 %. In both groups of plants, the sinuosity of the tangential cell walls of the epidermal cells in the upper and lower epidermis is a stable character (Cv ≤ 18.0 %). In the Ptilophyllum and Gnetum, the length of stomata demonstrates a low level of variability (Cv ≤ 16.8 %). A significant range of the coefficients of variation in both Gnetum and Bennettitales show the number of epidermal cells per 1 mm2 of the upper and lower epidermis (17.5 % ≤ Сv ≤ 31.9 %), the area of the epidermal cells in the upper and lower epidermis (21.2 % ≤ Сv ≤ 63.5 %) and the number of stomata per 1 mm2 of epidermis (29.3 % ≤ Сv ≤ 39.9 %). Similarities in the correlation structure of the epidermal characters are revealed in correlations between sinuosity of the tangential cell walls of the epidermis, the number of stomata per 1 mm2 and their size; the length of stomata and the number of epidermal cells; stomatal index and the number of epidermal cells of the epidermis. In Gnetum, the number of differentiated stomata correlates with the number of aborted stomata. In N. angustifolia and P. caucasicum, the number of stomata correlates with the number of papillae per 1 mm2. Similarities in correlational structure of epidermis in Nilssoniopteris, Ptilophyllum, and Gnetum could be ecological adaptations or ontogenetic characters, such as the development of stomata that has been described by other researchers.
现存麻属植物和中侏罗世麻属植物叶片表皮的结构组织
对Bennettitales叶片表皮特征之间的相关性进行了鉴定和评估,并将结果与现存植物叶片的结构组织进行了比较。对4种Gnetum L.和4种Jurassic Bennettales(Nilsoniopteris Nathorst和Ptilophyllum Morris)的表皮进行了研究。表皮性状Gnetum变异系数为6.4~24.0%,Ptilophyllum变异系数为15.7~63.5%,Nilsonopteris变异系数为18.0~39.9%。在这两组植物中,上表皮和下表皮的表皮细胞切向细胞壁的弯曲度是一个稳定的特征(Cv≤18.0%)。在Ptilophyllum和Gnetum中,气孔长度表现出低水平的变异性(Cv≤16.8%)。Gnetum和Bennettitales的显著变异系数范围显示了上下表皮每1mm2的表皮细胞数量(17.5%≤Сv≤31.9%)、上下表皮的表皮细胞面积(21.2%≤Сv≤63.5%)和每1mm2表皮的气孔数量(29.3%≤Сv≥39.9%)。表皮特征的相关结构的相似性表现在表皮切向细胞壁的弯曲度、每1mm2气孔的数量及其大小之间的相关性;气孔的长度和表皮细胞的数量;气孔指数和表皮的表皮细胞数量。在Gnetum中,分化的气孔数量与流产的气孔数量相关。在N.angustifolia和P.caucasicum中,气孔的数量与每1mm2的乳头数量相关。Nilsoniopteris、Ptilophyllum和Gnetum表皮相关结构的相似性可能是生态适应或个体发生特征,例如其他研究人员描述的气孔发育。
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来源期刊
Biological Communications
Biological Communications Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)
CiteScore
1.70
自引率
0.00%
发文量
21
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