A new species of Olpidium parasitic on cucumber roots

1968 ◽  
Vol 46 (9) ◽  
pp. 1087-1091 ◽  
Author(s):  
D. J. S. Barr
Keyword(s):  
New Species ◽  
Cucumis Sativus ◽  
Spore Morphology ◽  
Cucumis Sativus L ◽  
Exit Tube ◽  
Resting Spore ◽  
Cucumber Roots ◽  
A New Species

Olpidium cucurbitacearum sp. n., from roots of Cucumis sativus L. var. Windermoor Wonder, is described. The fungus is distinguished from other Olpidium spp. by its zoospore and resting spore morphology and its restriction to cucurbitaceous hosts, and from species of Pleotrachelus Zopf by the typical occurrence of a single exit tube per sporangium.

Leptosphaeria hispanica, a new species of the Dothideales, Ascomycotina

1987 ◽  
Vol 65 (10) ◽  
pp. 2096-2097
Author(s):  
J. Checa ◽  
G. Moreno
Keyword(s):  
New Species ◽  
Spore Morphology ◽  
A New Species

The authors propose a new species, Leptosphaeria hispanica, characterized by its spore morphology. The most interesting microscopical characters are illustrated photographically.

The Genus Podaxis (Gasteromycetes) in Australia with a Description of a New Species from Termite Mounds

1999 ◽  
Vol 12 (1) ◽  
pp. 109 ◽  
Author(s):  
M. Lenz ◽  
M.J. Priest
Keyword(s):  
New Species ◽  
Spore Morphology ◽  
Type Collection ◽  
Termite Mound ◽  
Termite Mounds ◽  
Valid Taxon ◽  
A New Species

In Australia, two species of Podaxis are recognised based on spore morphology. The species occurring on soil is recognised as P. pistillaris (L. : Pers.) Fr. and the name P. beringamensis sp. nov. is proposed for a new species occuring on termite mounds in Australia. Podaxis carcinomalis (L.f. : Pers.) Fr. is considered a valid taxon from studies of the type collection. Brief notes on other termite mound inhabiting species are given.

scholarly journals Micromyces bulbosus sp. nov

2014 ◽  
Vol 34 (2) ◽  
pp. 177-180
Author(s):  
Joanna Z. Kadłubowska
Keyword(s):  
New Species ◽  
Outer Surface ◽  
Forest Reserve ◽  
Resting Spore ◽  
A New Species

A new species <i>Micromyces bulbosus</i> Kadłubowska is described and illustrated from a puddle in the forest reserve Wolbórka (near Łódź~). This species differs from the others by the dimensions of the prosorus, sorus and resting spore, as well as shape and length of spines, also reticulate outer surface of prosorus.

scholarly journals Response of Cucumber (Cucumis sativus L.) and Squash (Cucurbita pepo L. var. melopepo) Roots to Chilling Stress during Early Stages of Seedling Development

1994 ◽  
Vol 119 (5) ◽  
pp. 964-970 ◽  
Author(s):  
Eleazar Reyes ◽  
Paul H. Jennings
Keyword(s):  
Root Growth ◽  
Cucumis Sativus ◽  
Cucurbita Pepo ◽  
Chilling Stress ◽  
Dry Weight ◽  
Root Tip ◽  
Crop Species ◽  
Cucumis Sativus L ◽  
Chilling Temperatures ◽  
Cucumber Roots

Roots of `Golden Girl' squash (Cucurbita pepo var. melopepo) and `Encore' cucumber (Cucumis sativus L.), 4- and 3-days-old, respectively, were exposed to 2, 6, 10, and 15C for 24, 48, 96, 144, and 192 hours to compare the sensitivity to chilling temperatures and the subsequent recovery at more favorable temperatures. Seedlings were more sensitive to chilling at 2 and 6C when measured by their ability to resume growth when returned to 26C. Root growth decreased after 48 hours of chilling. Seedlings stressed at 10 and 15C were able to continue root growth at these temperatures and when returned to 26C. However, seedlings at 10C exhibited root-tip browning in both crop species, suggesting disfunction in metabolic pathways that were repressed in seedlings growing at 2C where those symptoms were not present. Effects on root dry weight occurred in the first 24 hours at all temperatures studied. After 96 hours of treatment, seedlings grown at 2 and 6C were irreversibly damaged, as evidenced by their inability to resume growth when returned to 26C. Leakage of electrolytes from squash and cucumber roots increased after 48 hours at 2C. Potassium, Na+, and PO4-2 were lost in greater amounts than Mg+2, Cl-, and SO4-2. No difference in ionic leakage occurred at 10 and 15C, and Ca+2 leakage was not detected at any chilling stress temperature.

Characterization of plasma membrane bound cation-stimulated ATPase isolated from the roots of Cucumis sativus

1988 ◽  
Vol 66 (7) ◽  
pp. 1470-1473 ◽  
Author(s):  
Abdul Razaque Memon
Keyword(s):  
Plasma Membrane ◽  
Cucumis Sativus ◽  
Direct Interaction ◽  
Monovalent Cation ◽  
Phase System ◽  
Plasma Membrane Atpase ◽  
Cucumis Sativus L ◽  
Membrane Bound ◽  
Cucumber Roots

A membrane fraction enriched with Mg2+- or Mn2+-dependent, monovalent cation stimulated ATPase was isolated from cucumber roots (Cucumis sativus L.) by an aqueous two-polymer phase system of Dextran T500 (6.5%, w/w) and polyethylene glycol (PEG) 3350 (6.5%, w/w) at pH 7.8. The ATPase activity associated with the upper PEG-rich fraction (plasma membrane) was characterized. The optimum pH for the activation by Mg2+ and Mn2+ was in the range 5.8–6.0. The activity was substrate specific for ATP. Kinetics with Mg2+ or Mn2+ followed a simple Michaelis–Menten relationship. The apparent Km for Mg2+ activation (0.60 mM) of the ATPase was about twice that of the apparent Km for Mn2+ (0.38 mM). ATPase was stimulated by monovalent cations and showed an order of cation preference of [Formula: see text]. Calcium inhibited the plasma membrane ATPase, apparently by a direct interaction with ATPase rather than by disrupting the MgATP2− complex.

A new species ofRanunculus from Greece

1983 ◽  
Vol 94 (9-10) ◽  
pp. 591-593
Author(s):  
Kostas Papanicolaou ◽  
Stella Kokkini
Keyword(s):  
New Species ◽  
A New Species

A new species ofIlex (Aquifoliaceae) from Sumatra

1983 ◽  
Vol 94 (3-4) ◽  
pp. 165-172
Author(s):  
T. R. Dudley
Keyword(s):  
New Species ◽  
A New Species
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