scholarly journals Leaf anatomy and carbon isotope composition in Coffea species related to photosynthetic pathway

2003 ◽  
Vol 15 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Maria Luiza Carvalho Carelli ◽  
Rachel Benetti Queiroz-Voltan ◽  
Joel Irineu Fahl ◽  
Paulo César Ocheuze Trivelin
Keyword(s):  
Carbon Isotope ◽  
Vascular Bundle ◽  
Leaf Anatomy ◽  
Isotope Composition ◽  
Bundle Sheath ◽  
Carbon Isotope Composition ◽  
Photosynthetic Pathway ◽  
Spongy Parenchyma ◽  
Bundle Sheath Cells ◽  
Parenchyma Cells

Possible presence of vascular bundle sheath cells and its relation to photosynthetic pathway, leaf anatomy and carbon isotope composition (delta13C) were examined in six species of genus Coffea: C. arabica (cvs. Catuaí Vermelho, Mundo Novo, Bourbon Vermelho and Icatu Amarelo), C. canephora (cvs. Apoatã and Guarini), C. liberica, C. dewevrei, C. salvatrix and C. stenophylla. In all genotypes, the vascular bundle was surrounded by a layer of cells with numerous chloroplasts in a centrifugal position. Visually no differences could be seen between the spongy parenchyma cells and the bundle sheath cells, neither in size nor in chloroplast number. The leaf delta13C values ranged between a maximum of - 26.2 ‰ in C. salvatrix and a minimum of -29.7 ‰ in C. liberica. A strong correlation (r = 0.972, p = 0.001) between delta13C and anatomical characteristics was observed in coffee species. C. salvatrix exhibited the highest delta13C values and the most compact mesophyll, with more palisade and spongy parenchyma cells in contact with the vascular bundle sheath.

scholarly journals Carbon isotope composition and leaf anatomy as a tool to characterize the photosynthetic mechanism of Artemisia annua L.

2005 ◽  
Vol 17 (1) ◽  
pp. 187-190 ◽  
Author(s):  
José Abramo Marchese ◽  
Fernando Broetto ◽  
Lin Chau Ming ◽  
Carlos Ducatti ◽  
Roberto Antonio Rodella ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Leaf Anatomy ◽  
Vascular Tissue ◽  
Artemisia Annua ◽  
Isotope Composition ◽  
Carbon Isotope Composition ◽  
Kranz Anatomy ◽  
Artemisia Annua L ◽  
C3 And C4 Species ◽  
C4 Species

Leaves of Artemisia annua L. are a plentiful source of artemisinin, a drug with proven effectiveness against malaria. The aim of this study was to classify the photosynthetic mechanism of A. annua through studies of the carbon isotope composition (delta 13C) and the leaf anatomy. A. annua presented a delta 13C value of - 31.76 ± 0.07, which characterizes the plants as a typical species of the C3 photosynthethic mechanism, considering that the average delta 13C values for C3 and C4 species are -28 and -14, respectively. The leaf anatomy studies were consistent with the delta 13C results, where, in spite of the existence of parenchymatic cells forming a sheath surrounding the vascular tissue, the cells do not contain chloroplasts or starch. This characteristic is clearly different from that of the Kranz anatomy found in C4 species.

Leaf anatomy and ultrastructure of the North American marine angiosperm Phyllospadix (Zosteraceae)

1995 ◽  
Vol 73 (6) ◽  
pp. 827-842 ◽  
Author(s):  
John Kuo ◽  
Joan G. Stewart
Keyword(s):  
Vascular Bundle ◽  
North American ◽  
Cell Walls ◽  
Bundle Sheath ◽  
Epidermal Cells ◽  
The North ◽  
Bundle Sheath Cells ◽  
Parenchyma Cells ◽  
Sieve Tubes ◽  
Anatomy And Ultrastructure

The leaf anatomy and ultrastructure of the North American Phyllospadix species P. serrulatus Rupt. ex Aschers., P. scouleri Hook, and P. torreyi Watson are described. The unique anatomical and ultrastructural features of these species are compared with those of other seagrasses and their possible functional significance is discussed. All three species have ultrastructures similar to those in other members of the family Zosteracae. Subcuticular cavities, wall ingrowths, and numerous mitochondria and chloroplasts with well-developed grana are present in the blade epidermal cells and the adaxial sheath epidermal cells, indicating that these cells may play a major role in photosynthesis, osmoregulation, and absorption. Plasmodesmata are present occasionally between adjacent epidermal cells, and also between epidermal and mesophyll cells, suggesting that solutes can be transferred symplastically between these tissues. The vascular bundle sheath cells are not easy to recognize, as cell walls are thin and not suberized. The phloem contains both normal and nacreous-walled sieve tubes that may be functional. The walls of the phloem parenchyma cells facing nacreous-walled sieve tubes possess weak wall ingrowths, leading to speculation that these parenchyma cells may play an important role in solute translocation. The absence of suberin lamella in bundle sheath cells and the presence of a small xylem element in each vascular bundle suggest that the water flow in xylem elements in these seagrasses may be limited and that water is taken directly from the water column by leaf epidermal cells and is transported apoplastically along cell walls. The three North American Phyllospadix species can be separated by anatomical characters such as number of vascular bundles, the shape of epidermal cells in both transverse sectional and surface views, and the distribution of fibre bundles. It is proposed that P. serrulatus is taxonomically more closely related to the Japanese P. iwatensis Makino than to P. scouleri and P. torreyi and that there is no detectable hybrid species occurring between P. scouleri and P. torreyi. Key words: anatomy, ultrastructure, seagrasses, Phyllospadix, North America.

The influence of hydrodynamics on the carbon isotope composition of inorganically precipitated calcite

2021 ◽  
Vol 565 ◽  
pp. 116932
Author(s):  
Hao Yan ◽  
Wolfgang Dreybrodt ◽  
Huiming Bao ◽  
Yongbo Peng ◽  
Yu Wei ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Isotope Composition ◽  
Carbon Isotope Composition
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