The marginal stomata in Selaginella appear to be non-functional

Selaginella rivalis. A. Axillary leaves; B. leaf border showing marginal stomata; C. laminal stomata of Selaginella rivalis: note that the subsidiary cells of the stomata are indistinguishable from laminal cells.

 

The Non-Functional Stomata on the Leaf Margin of Selaginella

by Yi Y., Tan B. C. (xxxx)

Yi Youguang and Benito C. Tan

Department of Biological Sciences, National University of Singapore, Singapore 119267

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in Philippine Journal of Science 142: 245-248, Special Issue ISSN 0031 – 7683 –

http://philjournalsci.dost.gov.ph/pdf/special_issue/TheNonFunctionalStomataontheLeafMarginofSelaginella.pdf

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Apical leaf cells of lateral leaf and lateral outline of Selaginella roxburghii. Black dot indicates a leaf bordered stomata structure.

 

Abstract

Stomata are structures on the surface of leaves known for their function in gaseous exchange in plants. After examining 26 species of Selaginella collected from Peninsular Malaysia and Singapore, we discover and report the presence of stomatal structures that are located right on the border of adaxial surface of lateral and axillary leaves of four species of Selaginella (S. roxburghii, S. ridleyi, S. rivalis and S. ciliaris).

The marginal stomata appear to be non-functional due to their position on the leaf border which is one to two cells thick.

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Selaginella ciliaris. A. SEM photograph of margin of adaxial surface of lateral leaf of S. ciliaris showing the stomatal opening (750×); B. Line drawing of margin of adaxial surface of lateral leaf of S. ciliaris showing the stomata (400×).

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Stomata of Huperzia (Lycopodiaceae) under Different Light Treatments

Photo credit : Google

Huperzia serrata (Lycopodiaceae)

 

Morphology of Huperzia serrata and Its Stomata Characteristics under Different Light Treatments

by Li Y.-Y., Tang Y.-J., Li J., Zhou Y., Huang H.-Y. (2009)

LI You-You; TANG Yuan-Jiang; LI Jing; ZHOU Yi; HUANG Heng-Yu*
(1.Key Laboratory of Plant Resources Conservation and Utilization(Jishou University),College of Hunan Province,Jishou416000) (2.South China Botanical Garden,The Chinese Academy of Sciences,Guangzhou510650)

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in Bulletin of Botanical Research (BBR) 29(4): 411-416 – http://bbr.nefu.edu.cn/EN/Y2009/V29/I4/411 – 
http://bbr.nefu.edu.cn/EN/abstract/abstract905.shtml

Abstract

The morphological characteristics of Huperzia serrata (Thunb.) Trev. were described, and a few different characteristics were found. In addition, the relationship between the stomata characteristics and the illumination intensity was analyzed.

The results showed the length, width and area of single stomata, the stomata density and the total stomata area increased when the illumination intensity kept rising within a certain limit.

However, all of these stomata parameters decreased when the illumination intensity surpassed a certain value except the stomata density and the stomata index. The stomata of small sizes and high densities were the characteristics fitted for the arid conditions, indicting that this plant was ecological adaptive, but when it was under cultivation high illumination intensity should be avoided.

 

 

Stomata in Japanese Selaginellaceae

 

Systematic importance of the epidermal elements in the leaves of the Japanese Selaginellaceae

by Satake Y. (1934)

 

in Bot. Mag. Tokyo 48: 259-278 – http://doi.org/10.15281/jplantres1887.48.259 –

https://www.jstage.jst.go.jp/article/jplantres1887/48/568/48_568_259/_article

Twenty four species of the Japanese Selaginellae are examined for the purpose of discussing the systematic importance of the epidermal elements of leaves.

Stomatal control and gene signalling networks in bryophytes and lycophytes

 

Early evolutionary acquisition of stomatal control and development gene signalling networks.

by Chater C., Gray J. E., Beerling D. J. (2013)

Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, UK.

in Current Opinion in Plant Biology 16 : 638 – 646  – doi: 10.1016/j.pbi.2013.06.013. –

https://www.ncbi.nlm.nih.gov/pubmed/23871687

Abstract

Fossil stomata of early vascular land plants date back over 418 million years and exhibit properties suggesting that they were operational, including differentially thickened guard cells and sub-stomatal chambers.

Molecular studies on basal land plant groups (bryophytes and lycophytes) provide insight into the core genes involved in sensing and translating changes in the drought hormone abscisic acid (ABA), light and concentration of CO2 into changes in stomatal aperture.

These studies indicate that early land plants probably possessed the genetic tool kits for stomata to actively respond to environmental/endogenous cues. With these ancestral molecular genetic tool kits in place, stomatal regulation of plant carbon and water relations may have became progressively more effective as hydraulic systems evolved in seed plant lineages.

Gene expression and cross-species gene complementation studies suggest that the pathway regulating stomatal fate may also have been conserved across land plant evolution.

This emerging area offers a fascinating glimpse into the potential genetic tool kits used by the earliest vascular land plants to build and operate the stomata preserved in the fossil record.