Stomata in Podocarpus

Photo credit: NCBI

Micrographs of the abaxial epidermis of P. lambertii. (A) A view of stomatal distribution in longitudinal rows. Between the rows of stomata there are always sclereids beneath the epidermis, indicating that where there are sclereids there are no stomata (scale bar = 100 µm). (B) A view of the epidermis without sclereids (scale bar = 100 µm). (C) A detail of paratetracytic stomata with four subsidiary cells (scale bar = 50 µm).

Plasticity of stomatal distribution pattern and stem tracheid dimensions in Podocarpus lambertii: an ecological study

by Locosselli G. M., Ceccantini G. (2012)

in Ann Bot. 2012 Oct;110(5):1057-66.

doi: 10.1093/aob/mcs179. Epub 2012 Aug 7.

Abstract

BACKGROUND AND AIMS:

Leaf and wood plasticity are key elements in the survival of widely distributed plant species. Little is known, however, about variation in stomatal distribution in the leaf epidermis and its correlation with the dimensions of conducting cells in wood. This study aimed at testing the hypothesis that Podocarpus lambertii, a conifer tree, possesses a well-defined pattern of stomatal distribution, and that this pattern can vary together with the dimensions of stem tracheids as a possible strategy to survive in climatically different sites.

METHODS:

Leaves and wood were sampled from trees growing in a cold, wet site in south-eastern Brazil and in a warm, dry site in north-eastern Brazil. Stomata were thoroughly mapped in leaves from each study site to determine a spatial sampling strategy. Stomatal density, stomatal index and guard cell length were then sampled in three regions of the leaf: near the midrib, near the leaf margin and in between the two. This sampling strategy was used to test for a pattern and its possible variation between study sites. Wood and stomata data were analysed together via principal component analysis.

KEY RESULTS:

The following distribution pattern was found in the south-eastern leaves: the stomatal index was up to 25 % higher in the central leaf region, between the midrib and the leaf margin, than in the adjacent regions. The inverse pattern was found in the north-eastern leaves, in which the stomatal index was 10 % higher near the midrib and the leaf margin. This change in pattern was accompanied by smaller tracheid lumen diameter and length.

CONCLUSIONS:

Podocarpus lambertii individuals in sites with higher temperature and lower water availability jointly regulate stomatal distribution in leaves and tracheid dimensions in wood. The observed stomatal distribution pattern and variation appear to be closely related to the placement of conducting tissue in the mesophyll.

See the full text: Annals of Botany

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Wu J. L., Niu J. Y., Yan Z. Z., Li S., Gao Y. H., Jiang H. Y. (2007) – [SEM observation on leaf epidermis of different Ephedra species] (in Chinese) – Zhongguo Zhong Yao Za Zhi. 32(18):1854-1857 – PMID: 18051888 – https://www.ncbi.nlm.nih.gov/pubmed/18051888 – (On our blog : https://plantstomata.wordpress.com/2018/04/18/stomata-in-different-ephedra-species/ )

Xu B.-s., Zhang R.-h. ( 2002) – Study on chlorophyll content and stomata morphology of Pïnus massoniana – Chemistry and Industry of Forest Products 22(3): 59-61  – http://www.cifp.ac.cn/EN/abstract/abstract94.shtml – (On our blog : https://wordpress.com/post/plantstomata.wordpress.com/66462

Stomata in Pseudotsuga (Gymnospermae)

Photo credit: Gardens Online

Douglas Fir (Pseudotsuga menzieszii)

Morphology and Stomatal Function of Douglas Fir Needles Exposed to Climate Change: Elevated CO2 and Temperature

by Apple M.E., Olszyk D.M., Ormrod D.P., Lewis J., Southworth D., Tingey D.T. (2000)

in Int. J. Plant Sci. 2000 Jan;161(1):127-132.

Abstract

Climate change may have an impact on the productivity of conifer trees by influencing the morphology (size and surface characteristics) and function (capacity for gas exchange) of conifer needles.

In order to test the responses of needles to climatic variables, Douglas fir (Pseudotsuga menziesii [Mirb.] Franco), saplings were grown in sunlit controlled environment chambers at ambient or elevated (+200 parts per million above ambient) CO2 and at ambient or elevated temperature (+4 degrees C above ambient).

Needle characteristics, including length, width, area, stomatal density (stomata per mm2), percentage of stomatal occlusion, and the morphology of epicuticular wax, were evaluated.

Needle function was evaluated as stomatal conductance to water vapor and transpiration. Needle length increased significantly with elevated temperature but not with elevated CO2. Neither elevated CO2 nor elevated temperature affected stomatal density or stomatal number in these hypostomatous needles.

Epicuticular wax was less finely granular at elevated than at ambient temperature and was similar in appearance at elevated and ambient CO2. Stomatal conductance and transpiration increased with elevated temperature and associated increased vapor pressure deficit; however, neither conductance nor transpiration was affected by elevated CO2.

These results indicate that simulated climate change influences Douglas fir needle structure and function.

See the text: NCBI-PubMed

Stomata in Ceratozamia (Gymnosperms)

Photo credit: Google

Ceratozamia kuesteriana

Morphological aspects of stomata, cuticle and chloroplasts in Ceratozamia kuesteriana Regel (Zamiaceae)

by Barone Lumaga M. R., Moretti A.De Luca P. (1999)

in Plant Biosystems, Volume 133, Issue 1, 1999

Abstract

Light and scanning electron microscopy were utilised to study stoma and cuticle morphology whereas transmission electron microscopy was used to observe plastid ultrastructure in Ceratozamia kuesteriana Regel (Zamiaceae).

Results show that in C. kuesteriana a diperigenous‐type stoma (or a derivation of a diperigenous type) occurs and that protein crystalloids and prolamellar bodies are simultaneously present in the chloroplast.

Read the text: Taylor & Francis Online

Stomata in Taxus (Gymnosperms)

Photo credit: World Botanical Association

Taxus globosa var. floridana, showing stomata band with 7 rows of stomata, and midrib and marginal cells in mid region of leaf on abaxial surface

A new variety of Taxus brevifolia from the Pacific Northwest of North America

by Spjut R. W. (2014)

©The World Botanical Associates

The IV International Workshop, Oct 23–25, 2014,

http://www.taxus.cat/jornades2014

The Taxus wallichiana Subgroup  in North  America is characterized by leaves having tall rectangular to nearly quadrangular epidermal cells as seen in cross section (illus. above map), stomata in 12 rows/band, and a papillose abaxial midrib (top two rows of illus.).

There are two species, Taxus  brevifolia, subdivided into four varieties, var.brevifolia, var. klamathensis, var. polychaeta, and var. reptaneta, and T. globosa subdivided into two varieties, var. floridana and var. globosa.

The two species are distinguished by number of stomata rows in a stomata band, 4–7 (-9) in T. brevifolia, and 7–11 in T. globosa as plotted on the map above from plant specimens in herbaria and collected in the field, and by the shape of the marginal cells that border stomata bands, appearing ± rectangular in T. globosa, irregular  and inflated in T. brevifolia.

Taxus canadensis, which also occurs in the Mediterranean  Region (Spjut , is classified in the Taxus cuspidata Alliance (Spjut 2007b) of the Taxus baccata Group.  It is recognized by the absence of papillae across the midrib and marginal cells on the abaxial surface (Spjut 1992, 1993, 2000, 2007b).

Stomata of fossil Pinus (Gymnosperrms)

 

FOSSIL STOMATA REVEAL EARLY PINE PRESENCE IN SCOTLAND: IMPLICATIONS FOR POSTGLACIAL COLONIZATION ANALYSES

by C. A. Froyd

in Ecology 86:579–586.

The analysis of fossil stomata reveals the early postglacial presence of Pinus sylvestris at two sites in the Scottish Highlands, 1600 and 600 years prior to the arrival times indicated by traditional palynological methods.

Fossil stomata provide unambiguous evidence of past local presence for Pinus sylvestris, which produces abundant and widely dispersed pollen, revealing its presence when pine pollen frequencies are as low as 0.4%, considerably below the commonly adopted minimum frequency threshold of 20%. Thus a species may be present for hundreds to thousands of years before expansion of the local population is registered in the palynological record. This has significant implications, not only for the initial spread of pine throughout the British Isles, but more generally for analyses of the continental-scale migration of temperate and boreal forest taxa based on palynological data.

Failure to differentiate effectively among the processes of arrival, establishment, and expansion in analyses of plant migration rates and patterns means that many existing reconstructions of postglacial colonization may, in actuality, represent the expansion of populations over time, rather than the initial spread of species.

Read More: ESA Ecology

Stomata in Ginkgo biloba (Gymnosperms)

Photo credit: Rudall et al.

Ultrastructure of stomatal development in Ginkgo biloba

by Rudall P. J., Rowland A., Bateman R. M. (2012)
Paula J. Rudall, Royal Botanic Gardens, Kew, Richmond, UK

Alice Rowland
Richard M. Bateman, Royal Botanic Gardens, Kew, Richmond, UK
in Int. J. Plant Sci. 173(8):849–860 (2012)
Fig-7.png
We present the first ultrastructural study of stomatal development in the ‘‘living fossil’’ gymnosperm species Ginkgo bilobaThe Ginkgo lineage occupies a pivotal position in seed-plant phylogenies, but as most representatives are known only from fossils, the developmental pattern in G. biloba is critical for inferring patterns of stomatal evolution among seed plants. The distinctive fan-shaped leaf morphology of Ginkgo is related to its unusual petiolar vasculature.
Our results show that both cell lineages and cell interactions control stomatal patterning in this species. Both perigenous and mesoperigenous patterns of stomatal development are present, contrary to earlier reports of exclusively perigenous development. Ginkgo resembles grasses in possessing asymmetric divisions in perigenous neighbor cells, but resembleArabidopsis in possessing amplifying divisions within the stomatal lineage, though these divisions are relatively chaotic in Ginkgo.
The degree of asymmetry in meristemoidal divisions is less marked in Ginkgo than in Arabidopsis, a factor that influences the relative orientations of stomata in mature epidermal tissue. The role of asymmetric divisions represents a crucial question in determining stomatal classification.