Differential Grasshopper, Melanoplus differentialis (Thomas) (Orthoptera: Acrididae)

2012 ◽  
Keyword(s):  
Melanoplus Differentialis

Changes in the Distribution of Phosphorus in the Developing Grasshopper (Melanoplus differentialis) Embryo

1953 ◽  
Vol 26 (3) ◽  
pp. 242-254 ◽  
Author(s):  
Kiao-Hung Lu ◽  
Joseph Hall Bodine
Keyword(s):  
Melanoplus Differentialis

A Study of the Mechanism of Cyanide Inhibition: I. Effect of Concentration on the Egg of Melanoplus differentialis

1938 ◽  
Vol 11 (1) ◽  
pp. 54-62 ◽  
Author(s):  
W. A. Robbie ◽  
E. J. Boell ◽  
J. H. Bodine
Keyword(s):  
Melanoplus Differentialis ◽  
Cyanide Inhibition

Site of synthesis of the haemolymph agglutinin of Melanoplus differentialis (Acrididae: Orthoptera)

1988 ◽  
Vol 34 (12) ◽  
pp. 1077-1085 ◽  
Author(s):  
Brad Stiles ◽  
Roger S. Bradley ◽  
Gwendy S. Stuart ◽  
Kenneth D. Hapner
Keyword(s):  
Melanoplus Differentialis

THE ROLE OF INSECTS IN THE SPREAD OF CUCUMBER MOSAIC VIRUS

1964 ◽  
Vol 44 (1) ◽  
pp. 1-6 ◽  
Author(s):  
R. J. McClanahan ◽  
G. E. Guyer
Keyword(s):  
Cucumber Mosaic Virus ◽  
Mosaic Virus ◽  
Small Proportion ◽  
Aphis Gossypii ◽  
Macrosiphum Euphorbiae ◽  
Asclepias Syriaca ◽  
Melanoplus Differentialis ◽  
Aphis Gossypii Glover ◽  
Echinocystis Lobata

Entomological aspects of the epidemiology of cucumber mosaic virus (CMV) were studied in Michigan. Myzus persicae (Sulzer) and Aphis gossypii Glover were efficient vectors of CMV between various hosts in the laboratory. Macrosiphum euphorbiae (Thomas) transmitted CMV between cucumber and Echinocystis lobata (Michx.) T. & G. Myzocallis asclepiadis (Monell) was shown to be a new vector of CMV between Asclepias syriaca L. Neither Melanoplus differentialis (Thomas) nor Acalymma vittata (Fabricius) transmitted the virus in limited trials.There was a small proportion of cucumber plants infected early in July, when alate M. persicae were present. In August the incidence of infection rose rapidly after a period of activity of alate A. gossypii. Alate aphids were trapped in yellow water pans situated in and around cucumbers. Seven known vectors of CMV were caught.

Experimental Study of Moulting in the Grasshopper, Melanoplus Differentialis.

1936 ◽  
Vol 34 (5) ◽  
pp. 885-886 ◽  
Author(s):  
I. G. Weed
Keyword(s):  
Experimental Study ◽  
Melanoplus Differentialis

scholarly journals Differential Uptake of Tritiated Thymidine into Hetero- and Euchromatin in Melanoplus and Secale

1959 ◽  
Vol 6 (3) ◽  
pp. 457-466 ◽  
Author(s):  
A. Lima-de-Faria
Keyword(s):  
Sex Chromosome ◽  
Unit Area ◽  
Tritiated Thymidine ◽  
Early Prophase ◽  
Chromosome Counts ◽  
Heterochromatic Block ◽  
Melanoplus Differentialis ◽  
Photometric Measurements ◽  
Silver Grains ◽  
Prophase Of Meiosis

Grasshoppers of the species Melanoplus differentialis were injected with tritium-labelled thymidine. At intervals thereafter autoradiographic stripping film was applied over Feulgen squashes and sections. In this species during early prophase of meiosis the sex chromosome forms a heterochromatic block large enough to be resolved in tritium autoradiographs. A study of the squash preparations reveals that the sex chromosome is synthesizing DNA at a different period of time from the euchromatic autosomes. Since there is a developmental sequence of spermatocyte cysts along the testicular tubes it is possible from the sections to show that the heterochromatin synthesizes DNA later than does the euchromatin. To find out whether the results obtained in Melanoplus were characteristic of heterochromatin in general, young seedlings of rye were grown in a tritiated thymidine solution and Feulgen squashes were made as for Melanoplus. In rye leaf nuclei there is a large block of heterochromatin constituted by the proximal regions of the chromosomes and a euchromatic one formed by the median and distal regions of the same chromosomes. Here also the heterochromatin synthesizes DNA at a different period of time from the euchromatin. It is concluded that in rye the asynchrony of synthesis occurs within each chromosome. Counts of silver grains over the two types of chromatin in nuclei of Melanoplus and Secale disclosed that the number of grains per unit area was two to three times higher over the heterochromatin. To check the DNA content, Feulgen photometric measurements were made of Melanoplus nuclei at the same stage. The Feulgen and grain counts agree in showing that the heterochromatin contains two to three times more DNA per unit area than the euchromatin.

Sign in / Sign up

Export Citation Format

Share Document