Morphology and ultrastructure of an intertergal pheromone gland in the abdomen of the pine sawfly Neodiprion sertifer (Insecta, Hymenoptera): a potential source of sex pheromones

1981 ◽  
Vol 59 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Eric Hallberg ◽  
Jan Löfqvist
Keyword(s):  
Fat Body ◽  
Cell Types ◽  
Neodiprion Sertifer ◽  
Pheromone Gland ◽  
Pine Sawfly ◽  
Potential Source ◽  
Diprion Similis ◽  
Glandular Cells ◽  
Gland Duct ◽  
Pheromone Glands

An abdominal intertergal gland of the sawfly Neodiprion sertifer was found in both sexes of the sawfly N. sertifer, which is in contrast with Diprion similis, in which the gland is known only from the female. The gland lies laterally on each side of tergite II in the fat body between the tergite wall and trachea and opens into the fold of the arthrodial membrane between tergites II and III. The emission of secretion from the gland is controlled by a muscle opening the gland duct. Expansion of the lateral trachea probably forces the secretion out of the gland's lumen.The intertergal gland is a typical insect epidermal pheromone gland formed by three cell types: glandular, ductule, and hypodermal cells. The glandular cells have microvilli-lined cavities surrounded by numerous mitochondria. From these cavities arise ductules, surrounded by ductule cells, merging into other ductules that open into the lumen of the gland. The hypodermal cells underlie the cuticular walls of the lumen. This scheme is now well-known from many insect species as typical of epidermal pheromone glands with a draining duct. Finally, the possible function of the intertergal gland's secretion is discussed.

Taxonomy of Cocoons and Puparia, and their Contents, of Canadian Parasites of Diprion similis (Htg.) (Hymenoptera: Diprionidae)

1962 ◽  
Vol 94 (3) ◽  
pp. 271-282 ◽  
Author(s):  
Thelma Finlayson
Keyword(s):  
Neodiprion Sertifer ◽  
Pine Sawfly ◽  
The Third ◽  
Parasitic Hymenoptera ◽  
Diprion Similis ◽  
European Pine Sawfly

This is the third paper of a series on the taxonomy of cocoons and puparia, cast larval skins, and other remains of parasitic Hymenoptera and Diptera that are found in or near the remains of parasitized hosts hfter the parasites have emerged. It deals with the known Canadian parasites of the introduced pine sawfly, Diprion similis (Htg.); previous papers dealt with the known Canadian parasites of the European pine sawfly, Neodiprion sertifer (Geoff.) (Finlayson, 1960a) and the European spruce sawfly, Diprion hercyniae (Mtg.) (Finlayson, 1960b). Parasites of D. similis that werk encountered in either of the nvd previous papers in the series are not described or illustrated here.

Experimental Data on the Function of the Interstitium of the Gonads: Experiments with Cockerels

1947 ◽  
Vol s3-88 (2) ◽  
pp. 135-150
Author(s):  
J. W. SLUITER ◽  
G. J. VAN OORDT
Keyword(s):  
Experimental Data ◽  
Connective Tissue ◽  
Leydig Cells ◽  
Cell Types ◽  
Sex Hormone ◽  
Secretory Cells ◽  
Secretory Function ◽  
Glandular Cells ◽  
Male Sex ◽  
Secondary Function

1. The relative volumes of the testes and their components of 31 cockerels, 2-200 days old, were calculated and compared with the size of their increasing head appendages (Text-figs. 1a-d, 2); in addition, the effect of gestyl-administration on testes of cockerels of this age was investigated. 2. Several types of interstitial testis-cells could be distinguished morphologically and physiologically (Text-figs. 3-6 and Pl. 1); these cell-types were studied with different techniques and counted separately. 3. The main types of the interstitial cells are: (a) Lipoid cells, totally packed with lipoid globules. These cells, which are considered by many authors as fully developed Leydig cells, are not directly connected with the production of the male sex hormone; perhaps they have a secondary function in this respect, as cholesterolderivatives are stored in these cells (Pl. 1, Text-fig. 3a). (b) Secretory cells, characterized by the absence of lipoid vacuoles and the presence of numerous granular and filamentous mitochondria. These secretory cells, which produce the male sex hormone, can be divided into secretory cells A (Text-fig. 6a) without, and secretory cells B with, one large vacuole (Text-figs. 6b, 6c, 6d). 4. A considerable and partly intercellular storage of lipoids may take place at any age in the intertubular connective tissue (Text-figs. 3-4 and Pl. 1). 5. The number of the lipoid cells depends on the nutritive conditions of the animal and the development of its testes (Text-fig. 7). 6. In older cockerels most of the glandular cells lose their secretory function and pass over into lipoid storing cells. 7. Therefore we agree with Benoit, when he denies the occurrence of a ‘secretion de luxe’, but we cannot accept the presence of a ‘parenchyme de luxe’ in the testes of older cockerels.

The function of the neurogenic genes during epithelial development in the Drosophila embryo

Development ◽  
1992 ◽  
Vol 116 (4) ◽  
pp. 1203-1220 ◽  
Author(s):  
A.Y. Hartenstein ◽  
A. Rugendorff ◽  
U. Tepass ◽  
V. Hartenstein
Keyword(s):  
Fat Body ◽  
Cell Types ◽  
Malpighian Tubules ◽  
Drosophila Embryo ◽  
Stomatogastric Nervous System ◽  
Mesodermal Cell ◽  
Epithelial Phenotype ◽  
In The Wild ◽  
Two Stages ◽  
Enhancer Of Split

The complex embryonic phenotype of the six neurogenic mutations Notch, mastermind, big brain, Delta, Enhancer of split and neuralized was analyzed by using different antibodies and PlacZ markers, which allowed us to label most of the known embryonic tissues. Our results demonstrate that all of the neurogenic mutants show abnormalities in many different organs derived from all three germ layers. Defects caused by the neurogenic mutations in ectodermally derived tissues fell into two categories. First, all cell types that delaminate from the ectoderm (neuroblasts, sensory neurons, peripheral glia cells and oenocytes) are increased in number. Secondly, ectodermal tissues that in the wild type form epithelial structures lose their epithelial phenotype and dissociate (optic lobe, stomatogastric nervous system) or show significant differentiative abnormalities (trachea, Malpighian tubules and salivary gland). Abnormalities in tissues derived from the mesoderm were observed in all six neurogenic mutations. Most importantly, somatic myoblasts do not fuse and/or form an aberrant muscle pattern. Cardioblasts (which form the embryonic heart) are increased in number and show differentiative abnormalities; other mesodermal cell types (fat body, pericardial cells) are significantly decreased. The development of the endoderm (midgut rudiments) is disrupted in most of the neurogenic mutations (Notch, Delta, Enhancer of split and neuralized) during at least two stages. Defects occur as early as during gastrulation when the invaginating midgut rudiments prematurely lose their epithelial characteristics. Later, the transition of the midgut rudiments to form the midgut epithelium does not occur. In addition, the number of adult midgut precursor cells that segregate from the midgut rudiments is strongly increased. We propose that, at least in the ectodermally and endodermally derived tissues, neurogenic gene function is primarily involved in interactions among cells that need to acquire or to maintain an epithelial phenotype.

Field response of the pine sawfly Neodiprion sertifer to the pheromone (2S, 3S, 7S)-diprionyl acetate and its stereoisomers

1992 ◽  
Vol 62 (2) ◽  
pp. 169-181 ◽  
Author(s):  
O. Anderbrant ◽  
J. Löfqvist ◽  
H.-E. Högberg ◽  
E. Hedenström ◽  
A.-B. Wassgren ◽  
...  
Keyword(s):  
Neodiprion Sertifer ◽  
Pine Sawfly ◽  
Field Response

CANDLING AND SIGHTING TECHNIQUES USED IN LASER INVESTIGATIONS OF THE EUROPEAN PINE SAWFLY, NEODIPRION SERTIFER (HYMENOPTERA: DIPRIONIDAE)

1967 ◽  
Vol 99 (6) ◽  
pp. 670-672 ◽  
Author(s):  
Ronald W. Kobylnyk
Keyword(s):  
Laser Treatment ◽  
Light Transmission ◽  
Transmitted Light ◽  
Neodiprion Sertifer ◽  
Accurate Assessment ◽  
Pine Sawfly ◽  
Avian Eggs ◽  
Egg Shell ◽  
European Pine Sawfly ◽  
Zoology Department

Laser treatment of larval and pupal stages within cocoons of Neodiprion sertifer (Geoff.) requires an accurate assessment of viability and the antero-posterior alignment of the cocoon content. The use of the candling technique to assess qualitative features of avian eggs depends on the translucency of the egg shell and the differences in light transmission by other elements within it (Romanoff and Romanoff 1949). Transmitted-light methods have been employed for insects within cocoons by Cushman (1913) and Hanna (1935). A type of candling technique different from previous methods and which was developed in the Zoology Department, University of Guelph, enables N. sertifer cocoon content to be ascertained and is herein described.

Diapause Induction in a Kentucky Population of Diprion similis (Hymenoptera: Diprionidae)

1999 ◽  
Vol 34 (3) ◽  
pp. 328-334 ◽  
Author(s):  
Heidi L. Melcher ◽  
Lee H. Townsend
Keyword(s):  
Diapause Induction ◽  
Pine Sawfly ◽  
Sensitive Stage ◽  
Diprion Similis ◽  
Critical Photoperiod ◽  
Photoperiod Sensitive ◽  
Chilling Period

Critical photoperiod, sensitive stage for diapause induction, and requirements for termination of diapause were studied in a colony of the introduced pine sawfly, Diprion similis (Hartig), established from a feral Kentucky population. We investigated induction of diapause in the laboratory under photoperiods of 10:14, 11:13, 12:12, 13:11, 14:10, 15:9, and 16:8 (L:D) in the first trial, and added a photoperiod of 9:15 (L:D) in the second trial. Individuals exposed to light periods ≤12:12 (L:D) entered diapause; individuals in a photoperiod > 13:11 (L:D) bypassed diapause. The sensitive stage was determined using reciprocal switches of diapause-inducing (9:15) and non-diapause inducing (16:8) L:D regimes. Our studies indicated that late instars of the introduced pine sawfly are significantly sensitive to photoperiod. Termination of diapause in D. similis did not require a cold or chilling period. All individuals from critical photoperiod trials were kept at 22°C to determine the duration of diapause. Diapausing individuals emerged from the cocoon after 82 to 105 d, compared to 6 to 23 d for individuals not entering diapause.

scholarly journals Mating disruption of the pine sawfly Neodiprion sertifer (Hymenoptera: Diprionidae) in isolated pine stands

2002 ◽  
Vol 4 (3) ◽  
pp. 195-201 ◽  
Author(s):  
Antonio Martini ◽  
Nadia Baldassari ◽  
Piero Baronio ◽  
Olle Anderbrant ◽  
Erik Hedenstrom ◽  
...  
Keyword(s):  
Mating Disruption ◽  
Neodiprion Sertifer ◽  
Pine Sawfly ◽  
Pine Stands
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