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Inherited sterility in insects

From Wikipedia, the free encyclopedia

The inherited sterility in insects is induced by substerilizing doses of ionizing radiation. When partially sterile males mate with wild females, the radiation-induced deleterious effects are inherited by the F1 generation.[1] As a result, egg hatch is reduced and the resulting offspring are both highly sterile and predominately male. Compared with the high radiation required to achieve full sterility in Lepidoptera, the lower dose of radiation used to induce F1 sterility increases the quality and competitiveness of the released insects as measured by improved dispersal after release, increased mating ability, and superior sperm competition.[2][3][4]

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  • How Do Bees Make Honey?
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[MUSIC] The western, or European honeybee, pollinates three-fourths of the fruits, veggies and nuts we eat. We’d be in trouble without ‘em. Of course, there’s a reason we don’t call them zucchini bees, almond bees, or apple bees. They also give us honey. [MUSIC] One healthy hive will make and consume more than 50 kg of honey in a single year, and that takes a lot of work. Honey is made from nectar, but it doesn’t come out of flowers as that golden, sticky stuff. After finding a suitable food source, bees dive in head-first, using their long, specially-adapted tongues to slurp tiny sips of nectar into one of two stomachs. A single bee might have to drink from more than a thousand flowers to fill its honey stomach, which can weigh as much as the bee itself when full of nectar. On the way back to the hive, digestive enzymes are already working to turn that nectar into sweet gold. When she returns to the hive, the forager bee will vomit the nectar into the mouth of another worker. That bee will vomit it into another bee’s mouth, and so on. This game of regurgitation telephone is an important part of the honey-making process, since each bee adds more digestive enzymes to turn long chains of complex sugars in the raw nectar into simple monosaccharides like fructose and glucose. At this point, the nectar is still pretty watery, so the bees beat their wings and create an air current inside the hive to evaporate and thicken the nectar, finally capping the cell with beeswax so the enzyme-rich bee-barf can complete its transformation into honey. Because of its low water content and acidic pH, honey isn’t a very inviting place for bacteria or yeast spoilage, and it has an incredibly long shelf life in the hive or in your pantry. Honey has been found in Egyptian tombs dating back thousands of years, pretty much unspoiled… although I wouldn’t personally eat it, just in case. For one pound of honey, tens of thousands of foraging bees will together fly more than three times around the world and visit up to 8 million flowers. That takes teamwork and organization, and although they can’t talk they do communicate… with body language. Foragers dance to tell other bees where to find food. A circle dance means flowers are pretty close to the hive, but for food that’s farther away, they get their waggle on. The waggle dance of the honey bee was first decoded by Karl von Frisch, and it’s definitely one of the coolest examples of animal communication in nature. First the bee walks in a straight line, waggling its body back and forth and vibrating its wings, before repeating in a figure eight. Whatever angle the bee walks while waggling tells the other bees what direction to go. Straight up the line of honeycombs, then the food is in the direction of the sun. If the dance is pointed to the left or right, the other bees know to fly in that angle relative to the sun. The longer the waggle, the farther away the food is, and the better the food, the more excited the bee shakes its body. If that’s not amazing enough, even if they can’t see the sun itself, they can infer where it is and the time of day by reading the polarization of light in the blue sky. A single bee is a pretty simple creature, but together they create highly complex and social societies. There’s three main classes in a beehive: Drones, workers, and queens. When a new queen is born, she immediately runs around and kills her sisters, because there can be only one. During mating season, she’ll fly to a distant hive to mate with several males and store away the sperm, which she’ll use back at her home hive to lay more than a thousand eggs a day throughout the rest of her life. Any unfertilized eggs, those that don’t join up with sperm, will mature into male drones, which means they only have one set of chromosomes. But fertilized eggs are all genetically female, destined to become either queens or workers. Queens do the egg-laying of course, but worker bees are the backbone of the beehive. So what makes most females become workers, while just one wears the hive crown? A baby bee’s diet activates genetic programming that shifts its entire destiny. Every bee larva is initially fed a nutrient-rich food called royal jelly, but after a few days, worker bee babies are switched to a mixture of pollen and honey called “bee bread”. But queens eat royal jelly their whole life, even as adults. Scientists used to think it was just royal jelly that put queens on the throne, but just last year they discovered one chemical in bee bread, the food that queens don't get, that keeps worker bees sterile. Being a queen seems to be as much about what bees don't eat as what they do. Making honey is insect farming on its grandest scale, with intricate societies cooperating to make a food fit for bear tummies big and small… with the pleasant side effect of pollinating most of the world’s flowering plants. I’d say it’s a pretty sweet deal. Stay curious.



Area-wide integrated pest management programmes using the sterile insect technique (SIT) as a component have been successful against a number of pest flies or Diptera such as the New World screwworm, Cochliomyia hominivorax, various species of tephritidae fruit flies and against tsetse flies (Glossinidae). However, most moths or lepidopterans are more resistant to radiation than dipterans,[5] and as a consequence, the higher dose of radiation required to completely sterilize lepidopterans reduces their performance in the field. One approach to circumvent the negative effects associated with the high radio-resistance of Lepidoptera pests has been the use of inherited sterility or F1 sterility,[6] first documented in studies on the codling moth (Cydia pomonella).[7][8] Inherited sterility has also been documented in the Hemiptera order.

The silk worm Bombyx mori (Lepidoptera: Bombycidae) was the first insect in which inherited sterility was reported.[9] Then inherited sterility was reported in the greater wax moth Galleria mellonella (Lepidoptera:Pyralidae),[10] in the codling moth Cydia pomonella (Lepidoptera: Tortricidae),[11] in the large milkweed bug Oncopeltus fasciatus (Hemiptera: Lygaeidae),[12] in Gonocerus acuteangulatus (Hemiptera: Coreida),[13] in Rhodnius prolixus (Hemiptera: Reduviidae),[14] and in the Two-spotted spider mite Tetranychus urticae (Acari: Tetranychidae).[15]

Genetic basis

The mechanisms by which mutations cause lethality in Diptera in the developing zygote are well documented.[16][17][18] The primary lesion leading to a dominant lethal mutation is a break in the chromosome, in this case, induced by radiation. When a break is induced in a chromosome in mature sperm, it remains in this condition until after the sperm has entered an egg. Following fusion, nuclear divisions begin, and a break in a chromosome can have drastic effects on the viability of the embryo as development proceeds. During early prophase the broken chromosome undergoes normal replication, but during metaphase the broken ends can fuse leading to the formation of a dicentric chromosome and an acentric fragment. The acentric fragment is frequently lost, while the dicentric fragment forms a bridge at anaphase leading to another chromosomal break. This whole process then repeats itself, leading to the accumulation of serious imbalances in the genetic information of the daughter cells. The accumulation of this genetic damage finally leads to the death of the zygote).

Diptera, Hymenoptera, and Coleoptera orders can be classed as radiation-sensitive, while Lepidoptera, Homoptera and mites (Acari) orders are radiation-resistant.[19] A major difference between these two groups of Insects is that the former group has a localized centromere (monokinetic), while the latter has a diffuse centromere (holokinetic).[20][21][22][23] However, more recent work[24] suggested that lepidopteran chromosomes are intermediate between holokinetic and monocentric chromosomes. In any case, the centromere difference is believed to play a major, although not exclusive, role in radiation sensitivity.[25] It was suggested[26][27] that possible molecular mechanisms responsible for the high radioresistance in Lepidoptera might include an inducible cell recovery system and a DNA repair probes.

Lepidoptera also do not show the classical breakage-fusion-bridge cycle that is a characteristic of dominant lethals induced in Diptera. It appears that lepidopteran chromosomes can tolerate telomere loss without the drastic effects that this has on chromosomes in other orders.[28] Lepidopteran chromosomes possess a localized kinetochore plate to which the spindle microtubules attach during cell division.[29] The kinetochore plates are large and cover a significant portion of the chromosome length, ensuring that more radiation-induced breaks will not lead to the loss of chromosome fragments as is typical in species with monocentric chromosomes. In species with large kinetochore plates, the fragments may persist for a number of mitotic cell divisions, and can even be transmitted through germ cells to the next generation.[30] The plates also reduce the risk of lethality caused by the formation of dicentric chromosomes, acentric fragments, and other unstable aberrations.[28]

Field application

The F1 sterile progeny produced in the field enhance the efficacy of released partially sterile males, and improve compatibility with other pest control strategies. For example, the presence of F1 sterile progeny can be used to increase the build-up of natural enemies in the field. In addition, F1 sterile progeny can be used to study the potential host and geographical ranges of exotic lepidopteran pests.

Field programmes releasing irradiated moths under an SIT or inherited sterility approach have been in operation since the 1960s. The pink bollworm, Pectinophora gossypiella has been successfully contained since 1969 in cotton areas of the San Joaquin Valley in California and is being successfully targeted for eradication from cotton areas in the south-western USA and north-western Mexico. Since the early 1990s, the codling moth has been successfully suppressed in apple and pear production areas in the Okanagan Valley in British Columbia, Canada, and countries such as Argentina, Brazil and South Africa have plans or programmes against this pest. New Zealand eradicated outbreaks of the Australian painted apple moth, Teia anartoides. Mexico eradicated outbreaks of the cactus moth, Cactoblastis cactorum and the USA contains its advance along the Gulf of Mexico coast.[31][32] South Africa has a programme to suppress the false codling moth, Thaumatotibia leucotreta in citrus orchards[33] Control of most moth pests is hampered by the increased resistance to the most widely used broad spectrum insecticides; hence the potential for expanded implementation of inherited sterility as part of an area-wide integrated approach is considerable.

See also

Notes and references

  1. ^ North D.T. 1975. Inherited Sterility in Lepidoptera. Annual Review of Entomology Vol. 20: 167-182
  2. ^ North, David T.; Holt, Gerald 1968. Inherited Sterility in Progeny of Irradiated Male Cabbage Loopers. Journal of Economic Entomology, Volume 61, Number 4, pp. 928-931(4)
  3. ^ Seth R.K and S.E Reynolds 1993. Induction of inherited sterility in the tobacco hornworm Manduca sexta (Lepidoptera: Sphingidae) by substerilizing doses of ionizing radiation. Bulletin of Entomological Research, 83:227-235
  4. ^ Carpenter, J. E., S. Bloem and F. Marek. 2005. Inherited Sterility in Insects. Chapter 2.4 in Dyck, V. A., J. Hendrichs, and A. S. Robinson, editors, “Sterile Insect Technique. Principles and Practice in Area-Wide Integrated Pest Management”. Springer. The Netherlands
  5. ^ Bakri, A., N. Heather, J. Hendrichs, and I. Ferris. 2005. Fifty years of radiation biology in entomology: lessons learned from IDIDAS. Annals of the Entomological Society of America 98: 1-12.
  6. ^
  7. ^ Proverbs MD and Newton JR 1962. Influence of gamma radiation on the development and fertility of the codling moth, Carpocapsa pomonella (L.) (Lepidoptera: Olethreutidae). Canadian Journal Zoology, 40: 401-420.
  8. ^ Proverbs M.D. 1982. Sterile insect technique in codling moth control. pp. 85-99. Proceedings of the international symposium on the sterile insect technique and the use of radiation in genetic insect control. Jointly organized by the IAEA and the FAO and held in Neuherberg, 29 June - 3 July 1981. Vienna. IAEA. 1982. 495 p.
  9. ^ Astaurov, B. I., and S. L. Frolova . 1935. Artificial mutations in the silkworm (Bombyx mori L.). V. Sterility and spermatogenic anomalies in the progeny of irradiated moths concerning some questions of general biological and mutagenic action of X-rays. Biol. J. 4: 861-894 (in Russian).
  10. ^ Ostriakova-Varshaver, V.P. 1937. The bee moth, Galleria mellonella, as a new object for genetic investigations. II. Cytogenetic analysis of sterility initiated by X-rays in males. [In Russian.] Biologicheskii Zhurnal, 6: 816–836.
  11. ^ Proverbs MD. 1962. Sterile insect technique in codling moth control. pp. 85-99. Proceedings of the international symposium on the sterile insect technique and the use of radiation in genetic insect control, jointly organized by the IAEA and the FAO and held in Neuherberg, 29 June - 3 July 1981. Vienna. IAEA. 1982. 495 p.
  12. ^ LaChance, L. E. and Degrugillier, M. 1969. Chromosomal fragments transmitted through three generations in Oncopeltus (Hemiptera). Science, 166: 236–237.
  13. ^ Delrio G.;Cavalloro R. 1975. Sterilite hereditaire chez Gonocerus aculteangulatus Goenze (Rhyncote, Coreidea), pp.423-436 In: Sterility principles for insect control. proceedings Symposia, Innsbruck, Austria, 22–26 July 1974. STI/PUB/377. IAEA, Vienna 1975
  14. ^ Maudlin I. 1976. The inheritance of radiation induced semi-sterility in Rhodnius prolixus. Chromosoma 58 (1976), pp. 285–306.
  15. ^ Henneberry, T. J. 1964. Effects of gamma radiation on the fertility of the two-spotted spider mite and its progeny. J. Econ. Entomol. 57:672–674.
  16. ^ Smith R.H. and R.C. von Borstel 1972. Genetic control of insect populations. Science 178: 1164-1174
  17. ^ LaChance L.E. 1967. The introduction of dominant lethal mutations by ionizing radiation and chemical as related to sterile-male technique of insect control, pp. 617-650. In J.W. Right and R. Pal (eds.), Genetics of insect vectors of disease. Elsevier, Amsterdam, The Netherlands.
  18. ^ Robinson A.S. 2005. Genetic basis of the sterile insect technique, pp. 95-114. In V.A. Dyckn J. Hendrichs, A.S. Robinson (eds.), Sterile insect technique: principles and practice in Area-wide integrated pest management. Springer, Dordrecht, The Netherlands
  19. ^ Bakri, A., K. Mehta, and D. R. Lance. 2005. Sterilizing insects with ionizing radiation. pp. 233-268 In V. A. Dyck, J. Hendrichs, and A. S. Robinson (eds.), Sterile Insect Technique: Principles and Practice in Area-wide Integrated Pest Management. Springer, Dordrecht, The Netherland. 787 pp.
  20. ^ Bauer H. 1967. Die kinetische Organisation der Lepidopteren-Chromosomen. Chromosoma 22: 101-125.
  21. ^ LaChance, L. E. and Degrugillier, M. 1969. Chromosomal fragments transmitted through three generations in Oncopeltus (Hemiptera). Science, 166: 236–237.
  22. ^ Murakami A, Imai H.T. 1974. Cytological evidence for holocentric chromosomes of the silkworms, Bombyx mori and B. mandarina (Bombycidae, Lepidoptera). Chromosoma 47: 167-178.
  23. ^ Wrensch, D.L., J.B. Kethley & R.A. Norton. 1994. Cytogenetics of Holokinetic Chromosomes and Inverted Meiosis: Keys to the Evolutionary Success of Mites, with Generalizations on Eukaryotes. pp. 282 – 342. In M. A. Houck (Ed.), Mites: Ecological and Evolutionary Analyses of Life-History Patterns. Chapman & Hall, NY.
  24. ^ Wolf K.W. 1996. The structure of condensed chromosomes in mitosis and meiosis of insects. International Journal of Insect Morphology and Embryology Volume 25, Issues 1-2, January–April 1996, Pages 37-62.
  25. ^ Carpenter, J. E., S. Bloem, and F. Marec. 2005. Inherited sterility in insects. pp. 115-146 In V. A. Dyck, J. Hendrichs, and A. S. Robinson (eds.), Principles and Practice in Area-wide Integrated Pest Management. Springer, Dordrecht, The Netherlands. 787 pp.
  26. ^ LaChance, L.E., and Graham, C.K. 1984. Insect radiosensitivity: Dose curves and dose-fractionation studies of dominant lethal mutations in the mature sperm of 4 insect species. Mutat. Res. 127: 49–59.
  27. ^ KOVAL, T. M. 1996. Moths: myths and mysteries of stress resistance. BioEssays, 18, 149-156.
  28. ^ a b Tothová A. and F. Marec 2001. Chromosomal principle of radiation-induced F1 sterility in Ephestia kuehniella (Lepidoptera: Pyralidae). Genome 44: 172–184
  29. ^ Wolf, K. W., Novak, K. & Marec, F., 1997. Kinetic organization of metaphase I bivalents in spermatogenesis of Lepidoptera and Trichoptera species with small chromosome numbers. Heredity 79: 135–143.
  30. ^ Marec, F., Tothova, A., Sahares, K., and Traut, W. 2001. Meiotic pairing of sex chromosome fragments and its relation to atypical transmission of a sex-llinked marker in Ephistia kuehniella (Insecta: Lepidoptera). Heredity 87, 659-671.
  31. ^
  32. ^
  33. ^

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