نتایج جستجو برای: parthenogenesis
تعداد نتایج: 892 فیلتر نتایج به سال:
Parthenogenesis, a natural form of asexual reproduction produced from unfertilized eggs, occurs in many insects in Hemiptera and Hymenoptera, but very rarely in Lepidoptera. The current study aimed to test the larval density dependent occurrence of parthenogenesis in potato tuber moth, Phthorimaea operculella (Zeller; Lepidoptera: Gelechiidae) under laboratory conditions. More than 10% of femal...
Asexual taxa often have larger ranges than their sexual progenitors, particularly in areas affected by Pleistocene glaciations. The reasons given for this 'geographical parthenogenesis' are contentious, with expansion of the ecological niche or colonisation advantages of uniparental reproduction assumed most important in case of plants. Here, we parameterized a spread model for the alpine butte...
Abstract Endosymbiotic bacteria can induce parthenogenesis in many haplo-diploid species, but little is known about their role asexual reproduction diplodiploids. Bacteria are essential for the lineages of springtails and booklice, possibly some weevils, whether they causative agent remains to be proven. This would require comparing unisexual forms closely related bisexual such model species ve...
Purpose. Investigation of cytogenetic aspects embryological processes in the culture immature apomictic embryos, breeding genotypes sugar beet with cytoplasmic sterility for differentiation and selection by gametophyte reduced parthenogenesis.
 Methods. Cytological, biotechnological, fluorescent cytophotometry, field, laboratory.
 Results. The features genesis embryos cells induced vi...
Elasmus steffani (Viggiani) (Hymenoptera: Elasmidae) is a gregarious idiobiont ectoparasitoid of Prays oleae (Bernard) (Lepidoptera: Plutellidae), an olive crop pest. In the substitute host Ephestia kuehniella (Zeller) (Lepidoptera: Pyralidae), the duration of the developmental stages was approximately 11-15 days. The preoviposition was 8.9 ± 5.0 days, and oviposition lasted 30.4 ± 10.5 days, w...
Naupactini is a tribe of Neotropical broad-nosed weevils highly diverse in South America. This group includes several parthenogenetic species, some them harmful for agriculture and invasive around the world. Although hypotheses based on polyploidy hybridization have been proposed to explain origin parthenogenesis weevils, infection with bacterium Wolbachia pipientis may be involved reproduction...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید