Morphological and anatomical features of the underground organs of angiosperm perennials growing under extreme environmental conditions

The morphological and anatomical features of the specimens of the brown alga Laminaria solidungula collected in the White Sea are provided. Environmental conditions for the growth and reproduction of this species in the White Sea are analyzed. The probable timing of penetration of this species into the White Sea and possible scenarios of changes in its distribution in response to global warming are discussed.

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Morpho-anatomical features of underground systems in six Asteraceae species from the Brazilian Cerrado

Anais da Academia Brasileira de Ciências ◽

10.1590/s0001-37652011005000018 ◽

2011 ◽

Vol 83 (3) ◽

pp. 981-992 ◽

Cited By ~ 22

Author(s):

Beatriz Appezzato-da-Glória ◽

Graziela Cury

Keyword(s):

Environmental Conditions ◽

Lateral Roots ◽

Adaptive Strategy ◽

Herbaceous Species ◽

Bud Bank ◽

Brazilian Cerrado ◽

Neotropical Savanna ◽

Anatomical Features ◽

Paulo State ◽

Vegetation Regeneration

In the Brazilian Cerrado (neotropical savanna), the development of bud-bearing underground systems as adaptive structures to fire and dry periods can comprise an important source of buds for this ecosystem, as already demonstrated in the Brazilian Campos grasslands and North American prairies. Asteraceae species from both woody and herbaceous strata have subterranean organs that accumulate carbohydrates, reinforcing the adaptive strategy of these plants to different environmental conditions. This study aims to analyse the morpho-anatomy of underground systems of six species of Asteraceae (Mikania cordifolia L.f. Willd., Mikania sessilifolia DC, Trixis nobilis (Vell.) Katinas, Pterocaulon alopecuroides (Lam.) DC., Vernonia elegans Gardner and Vernonia megapotamica Spreng.), to describe these structures and to verify the occurrence and origin of shoot buds, and to analyse the presence of reserve substances. Individuals sampled in Cerrado areas in São Paulo State showed thick underground bud-bearing organs, with adventitious or lateral roots and presence of fructans. Xylopodium was found in all studied species, except for Trixis nobilis, which had stem tuber. The presence of fructans as reserve, and the capacity of structures in the formation of buds indicate the potential of herbaceous species of Asteraceae in forming a viable bud bank for vegetation regeneration in the Brazilian Cerrado.

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Occurrence of Soft and Hard Corals at Igang Bay and Villa Corazon, Nueva Valencia, Guimaras, Philippines

JPAIR Multidisciplinary Research ◽

10.7719/jpair.v7i1.155 ◽

2012 ◽

Vol 7 (1) ◽

Author(s):

Melchor Magramo ◽

Mary Mar Esmaña ◽

June Raymond Peter Flores ◽

Marlon Terunez

Keyword(s):

Water Depth ◽

Environmental Conditions ◽

Soft Corals ◽

Substrate Type ◽

Anatomical Features ◽

Structural Composition ◽

A Value ◽

Physico Chemical ◽

Sampling Points ◽

Chemical Conditions

The distribution of soft and hard corals is due to prevailing environmental conditions, coral anatomical features and structural composition and presence or absence of predators and competitors. The study determined the occurrence of soft and hard corals in Igang Bay, Nueva Valencia, Guimaras, Philippines. Ocular survey was conducted at front beach of Villa Igang and transect – quadrat sampling was carried out. . The results showed that soft corals found in Igang Bay include the genera Lobophytum, Radianthus, Sarcophyton, Sinularia and Xenia and hard corals include those that belong to Acropora, Coeloseris, Coscinaraea, Favia, Favites, Fungia, Lonophyllia, Millepora, Montipora and Porites genera. Hard corals had a greater cover with a total of 38.94% while soft corals had 3.33%. In each transect, hard corals occupied more space than soft corals. There were 6 colonies for hard corals and none for soft corals. Physico – chemical conditions, particularly the salinity did not vary between three sampling points with a value of 29 ppt. and the temperature between surface and bottom had an average of 31°C and 31.7°C.The water depth ranged from 0.9 to 1.1 meters. Generally, the substrate type was rocky and sandy with presence of some coral rubbles in some portions along the transect lines. Keywords – hard corals, soft corals, salinity, temperature, Igang Bay

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Wood Anatomical Variation of Acacia Melanoxylon in Relation to Latitude

IAWA Journal ◽

10.1163/22941932-90000490 ◽

1989 ◽

Vol 10 (2) ◽

pp. 201-207 ◽

Cited By ~ 20

Author(s):

A. P. Wilkins ◽

Sabine Papassotiriou

Keyword(s):

Environmental Conditions ◽

Wood Anatomy ◽

Anatomical Variation ◽

Basic Density ◽

Vessel Diameter ◽

Axial Parenchyma ◽

Anatomical Features ◽

Acacia Melanoxylon ◽

Eastern Australia ◽

Total Proportion

The wood anatomy of Acacia melanoxylon samples from various locations in eastern Australia was examined and a number of characteristics were found to be significantly related to latitude. Vessel member length, proportion of fibres and proportion of multiseriate rays were positively related to latitude. Vessel frequency, vessel diameter and the abundance of crystals were negatively related to latitude as were the proportion of: uniseriate rays, vessels and axial parenchyma. Total proportion of ray tissue and basic density was not found to be associated with latitude.Anatomical features associated with lower transpirational demand appeared to be correlated with the cooler, more xeric environmental conditions accompanying increasing latitude.

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Mitochondrial Reconstructions Based on Serial Thick Sections and HVEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100115055 ◽

1975 ◽

Vol 33 ◽

pp. 286-287

Author(s):

Jerome J. Paulin

Keyword(s):

Imaging Techniques ◽

Three Dimensional ◽

Posterior Pole ◽

Dimensional Structure ◽

Stereo Imaging ◽

Thin Sections ◽

Anatomical Features ◽

The Past ◽

Cellular Components ◽

Mitochondrial Reticulum

Within the past decade it has become apparent that HVEM offers the biologist a means to explore the three-dimensional structure of cells and/or organelles. Stereo-imaging of thick sections (e.g. 0.25-10 μm) not only reveals anatomical features of cellular components, but also reduces errors of interpretation associated with overlap of structures seen in thick sections. Concomitant with stereo-imaging techniques conventional serial Sectioning methods developed with thin sections have been adopted to serial thick sections (≥ 0.25 μm). Three-dimensional reconstructions of the chondriome of several species of trypanosomatid flagellates have been made from tracings of mitochondrial profiles on cellulose acetate sheets. The sheets are flooded with acetone, gluing them together, and the model sawed from the composite and redrawn.The extensive mitochondrial reticulum can be seen in consecutive thick sections of (0.25 μm thick) Crithidia fasciculata (Figs. 1-2). Profiles of the mitochondrion are distinguishable from the anterior apex of the cell (small arrow, Fig. 1) to the posterior pole (small arrow, Fig. 2).

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Vibration Isolator System for Electron Microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010017966x ◽

1990 ◽

Vol 48 (1) ◽

pp. 182-183

Author(s):

K. Ohi ◽

M. Mizuno ◽

T. Kasai ◽

Y. Ohkura ◽

K. Mizuno ◽

...

Keyword(s):

Electron Microscope ◽

Magnetic Fields ◽

Environmental Conditions ◽

Vibration Isolator ◽

Air Conditioners ◽

Vibration Isolators ◽

Large Size ◽

Electron Microscopes

In recent years, with electron microscopes coming into wider use, their installation environments do not necessarily give their performance full play. Their environmental conditions include air-conditioners, magnetic fields, and vibrations. We report a jointly developed entirely new vibration isolator which is effective against the vibrations transmitted from the floor.Conventionally, large-sized vibration isolators which need the digging of a pit have been used. These vibration isolators, however, are large present problems of installation and maintenance because of their large-size.Thus, we intended to make a vibration isolator which1) eliminates the need for changing the installation room2) eliminates the need of maintenance and3) are compact in size and easily installable.

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