Comparative morphology and anatomy of absorbing roots and anchoring roots in three species of Cyclanthaceae (Monocotyledoneae)

1992 ◽  
Vol 70 (1) ◽  
pp. 38-48 ◽  
Author(s):  
George J. Wilder
Keyword(s):  
Key Words ◽  
Root Morphology ◽  
Comparative Morphology ◽  
Base Length ◽  
Aerial Parts ◽  
Host Trees ◽  
General Restriction ◽  
Absorbing Roots

Asplundia sp., Evodianthus funifer, and Thoracocarpus bissectus are root-climbing lianas that each have absorbing roots and anchoring roots. On stems appressed to the trunks of host trees, both types of roots arise mainly from internodes, generally emerging from those halves of stem surfaces facing the trunks (Asplundia sp., E. funifer), and may form nonreplacement roots and replacement roots. Aerial portions of absorbing roots differ from anchoring roots according to direction of growth, abundance of nonreplacement roots, diameter 1 cm distal to base, length, abundance, and color (T. bissectus). In all species the anchoring roots (with or without replacement roots) are interpretable as determinate because on long specimens their distal portions appear anatomically narrowed and reduced. In contrast, aerial parts of absorbing roots are indeterminate. The determinate aspects of anchoring roots and the general restriction (on stems appressed to tree trunks) of roots to trunk-facing stem surfaces are advantageous as means for conserving biomass. Key words: roots, root morphology, root dimorphism, Cyclanthaceae.

scholarly journals Glandular and eglandular hairs of Salvia recognita Fisch. & Mey. (Lamiaceae) in Turkey

1970 ◽  
Vol 37 (1) ◽  
pp. 93-95 ◽  
Author(s):  
Mustafa Özkan
Keyword(s):  
Key Words ◽  
Glandular Hairs ◽  
Aerial Parts ◽  
Stem Leaf

Distribution of glandular and eglandular hairs on the aerial organs of Salvia recognita Fisch. & Mey. has been investigated. Glandular hairs of S. recognita have consisted of capitate and peltate hairs. Capitate hairs were present abundantly on all aerial parts of S. recognita while peltate hairs were only present on stem, leaf, bract and calyx. Eglandular hairs were also widespread on all aerial parts. Key words: Salvia recognita, Lamiaceae, Glandular hairs, Eglandular hairs, Endemic doi:10.3329/bjb.v37i1.1571 Bangladesh J. Bot. 37(1): 93-95, 2008 (June)

scholarly journals Comparison of the Volatile Constituents of Thymus serpylum from the Altitude of Far Western Nepal & North India

1970 ◽  
Vol 7 (7) ◽  
pp. 92-93
Author(s):  
BC Thakuri ◽  
RC Padalia ◽  
CS Mathela
Keyword(s):  
Essential Oils ◽  
Key Words ◽  
North India ◽  
Good Source ◽  
Volatile Constituents ◽  
Aerial Parts ◽  
Scientific World ◽  
Key Words Thymus

The composition of aerial parts of the Thymus Serpylum family Labiatae, collected from two localities in Uttarakhand of India viz., Martoli village (3600 m), Jageshwar (1500 m) and one locality from Dadeldhura district of far western Nepal (1900 m) are reported. The steam-distilled essential oils have been investigated for its flavor constituents by GC and GC-MS. Seventeen compounds representing (88.16%), twenty compounds representing (97.03%) & seventeen compounds (96.13%) respectively from Martoli village, Jageshwar and Dadeldhura have been identified. The collection from Martoli village contained thymol (68.32%) along with carvacrol (7.19%) as major constituents and the sample collected from Dadeldhura is also rich in thymol (74.92%) and carvacrol (5.09%). However, the sample from Jageshwar had reduced amount of thymol (46.24%) along with significant quantities of ã-terpinene (12.21%), thymoquinone (9.43%), p-cymene (7.30%) and considerably reduced amount of carvacrol (4.62%). The Nepali (Dadeldhura) sample is good source of thymol. Key words: Thymus serpylum; Labiatae; Composition of volatile constituents; Dadeldhura; Thymol; Carvacrol; Thymoquinone; P-cymene. DOI: 10.3126/sw.v7i7.3834 Scientific World Vol.7(7) 2009 pp.92-93

Comparative anatomy of absorbing roots and anchoring roots in three species of Cyclanthaceae (Monocotyledoneae)

1992 ◽  
Vol 70 (12) ◽  
pp. 2384-2404 ◽  
Author(s):  
George J. Wilder ◽  
Jeffrey R. Johansen
Keyword(s):  
Key Words ◽  
Vascular Tissue ◽  
Comparative Anatomy ◽  
Root Anatomy ◽  
Tracheary Elements ◽  
Sieve Elements ◽  
Quantitative Characteristics ◽  
Root Types ◽  
Absorbing Roots

Absorbing roots and anchoring roots of Asplundia sp., Evodianthus fiinifer, and Thoracocarpus bissectus differ from one another anatomically in at least 15 quantitative characteristics and in additional related respects. Differences are diverse, involving both stelar and extrastelar tissues. Absorbing roots are significantly greater in diameter, have more vascular tissue, exhibit broader tracheary elements and sieve elements, and have other characteristics supporting the hypothesis that those features logically interpretable as optimizing conduction in xylem and phloem predominate in the absorbing roots. The three species also differ significantly from each other according to the anatomy of their absorbing roots, with T. bissectus having the most distinctive anatomy. Statistical and nonstatistical approaches to analysis of the data provided very consistent results, both in regard to differences between the two root types under study and to differences between taxa. Key words: absorbing roots, anchoring roots, Asplundia, Cyclanthaceae, Evodianthus, root anatomy, Thoracocarpus.

INFLUENCES OF SEASONAL TEMPERATURE ON NITROGEN AND SULFUR MINERALIZATION/IMMOBILIZATION IN A MAPLE-BIRCH FOREST FLOOR IN CENTRAL ONTARIO

1989 ◽  
Vol 69 (3) ◽  
pp. 501-514 ◽  
Author(s):  
N. W. FOSTER
Keyword(s):  
Soil Temperature ◽  
Ammonium Nitrate ◽  
Key Words ◽  
Forest Floor ◽  
Late Summer ◽  
Seasonal Temperature ◽  
Net Mineralization ◽  
Net Release ◽  
Sulfur Mineralization ◽  
Absorbing Roots

Net mineralization of sulfur (S) and nitrogen (N) and nitrification in an F(Oe) horizon were examined over a 16-wk period (May to September) with (a) buried bags, (b) lysimeters and (c) closed flasks at 10, 20 or 30 °C. The amount of [Formula: see text] plus [Formula: see text] extracted from soil held at 33 kPa tension over 16 wk, when extrapolated to the mass of soil in the field, was 30 kg ha−1 N and 9 kg ha−1[Formula: see text] at constant 20 °C in the flasks, and 33 kg ha−1 N and 4 kg ha−1[Formula: see text] in buried bags (mean daily temperature 15.2 °C). On the basis of lysimeter data there was a net release of only 8 kg ha−1 N and a net retention of 3 kg ha−1[Formula: see text] under field conditions, with fluctuating temperature and moisture and actively absorbing roots. Nitrate recovered from the three types of experiment was equivalent to 18, 36, and 4 kg ha−1 N, respectively. Mineralization appeared to be particularly sensitive to temporal changes in average daily temperatures in the field. The late-summer peak in mean daily forest-floor temperature triggered a shift from net mineralization to net immobilization of N. Key words: Soil temperature, forest floor, sulfate, ammonium, nitrate

Powdery mildew-resistant UG3 and UG4 rutabaga germplasm

1993 ◽  
Vol 73 (1) ◽  
pp. 301-302 ◽  
Author(s):  
V. I. Shattuck
Keyword(s):  
Disease Resistance ◽  
Brassica Napus ◽  
Powdery Mildew ◽  
Key Words ◽  
Root Morphology ◽  
Average Weight ◽  
Powdery Mildew Disease

UG3 and UG4 rutabaga (Brassica napus ssp. rapifera) germplasm lines are highly resistant to powdery mildew, and are suitable for developing powdery mildew-resistant B. napus cultivars. The lines were derived from a powdery mildew-resistant rutabaga mutant. Both lines are self-fertile, yield average weight roots that store well, but lack optimal root morphology. Key words: Rutabaga, germplasm, powdery mildew, disease resistance

scholarly journals Comparative morphology and floral biology of three species of the genus of Nymphaea from Bangladesh

1970 ◽  
Vol 39 (2) ◽  
pp. 179-183 ◽  
Author(s):  
Hosne Ara Begum ◽  
KK Ghosal ◽  
TK Chattopadhyay
Keyword(s):  
Key Words ◽  
Significant Role ◽  
Pollen Germination ◽  
Comparative Morphology ◽  
Floral Biology ◽  
Anther Dehiscence

Morphology and floral biology of three species of the genus Nymphaea (Nymphaeaceae) of Bangladesh revealed that N. nouchali, N. pubescens and N. rubra, were normal, protogynous or normal and protogynous, respectively. N. pubescens was night bloomer and each flower opened for three consecutive nights where as N. rubra opened for four consecutive nights and N. nouchali for three consecutive days. The behavior of anther dehiscence and stigma appendages had significant role in pollination. Excellent pollen germination and receptivity were observed in the exudate of stigma cup. Key words: Nymphaea; Comparative morphology; Floral biology DOI: 10.3329/bjb.v39i2.7478 Bangladesh J. Bot. 39(2): 179-183, 2010 (December)  

scholarly journals Constituents of Volatile Oils from Limnophila aromatica and Adenosma capitatum

1970 ◽  
Vol 46 (3) ◽  
pp. 385-388 ◽  
Author(s):  
JU Chowdhury ◽  
MNI Bhuiyan ◽  
J Begum
Keyword(s):  
Essential Oils ◽  
Key Words ◽  
The Other ◽  
Volatile Oils ◽  
Aerial Parts ◽  
Other Hand

The essential oils isolated from the aerial parts of Limnophila aromatica (Lamk.) Merr. and Adenosma capitatum (Benth) Benth ex Hance were analyzed by GC-MS. Twenty nine and forty two components were identified, representing 99.3 and 98.6% of the total oils respectively. Oil of L. aromatica rich in Z-ocimene (39.2%), terpinolene (17.2%) and camphor (12.9%). On the other hand, A. capitatum rich in limonene (24.7%), fenchone (21.6%) and 2-carene (17.6%). Key words : Limnophila aromatic; Adenosma capitatum; Essential oils; Z-ocimene; Limonene. DOI: http://dx.doi.org/10.3329/bjsir.v46i3.9048 BJSIR 2011; 46(3): 385-388

Searching for homologous ultrastructural characters in zoosporic fungi

1995 ◽  
Vol 73 (S1) ◽  
pp. 693-700 ◽  
Author(s):  
Martha J. Powell ◽  
Will H. Blackwell
Keyword(s):  
Key Words ◽  
Morphological Character ◽  
Comparative Morphology ◽  
Body Structure ◽  
Data Bases ◽  
Ultrastructural Studies ◽  
Single Membrane ◽  
Motile Cells ◽  
Phylogenetic Hypotheses ◽  
And Function

One aim of ultrastructural studies of motile cells of Oomycetes and Chytridiomycetes, two groups of organisms recognized to have evolved along distinct lineages, has been to compile data bases of characters for reconstruction of phylogenetic hypotheses. Because little is known about the ontogeny, composition, and function of many structures that might be useful, assuming homology owing to similarity in ultrastructural form is problematic. In this paper we explore approaches to elucidating homologies between single membrane bounded organelles in zoospores. We use K-bodies of Oomycete zoospores as an example of an organelle for which ontogenic studies have revealed that certain morphological forms are analogous to other forms. Results of these studies demonstrate that as a morphological character K-body structure can be valuable among subgroups of Oomycetes, but convergence in structure makes it unreliable as a comparative character across the class. Although comparative morphology as an avenue to understanding phylogeny is sometimes challenged, this approach can provide valuable insights into processes involved in organellar evolution. Key words: Chytridiomycetes, Oomycetes, organelles, systematics, ultrastructure, zoospores.

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