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Response of life-history traits to artificial and natural selection for virulence and nonvirulence in a Drosophila parastitoid, Asobara tabida



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Photosynthetic pigments accumulation and some growth indices of cowpea, maize and tomato in response to interspecific and intraspecific competition stress

【摘要】<p>This study aimed at investigating the photosynthetic pigment accumulation and some growth indices of cowpea, maize and</p><p>tomato in response to interspecific and intraspecific competition stress. The study was carried out under a screen-house to</p><p>minimize extraneous factors such as pests and rodents using a randomized complete block design (RCBD). Seeds of</p><p>cowpea, maize and tomato were collected from the Department of Crop Production and Protection, Faculty of Agriculture,</p><p>Obafemi Awolowo University, Ile Ife, Osun state, Nigeria. These seeds were planted at a depth of about 3 mm below the</p><p>soil.&nbsp;</p>

《寒旱区科学(英文版)》 | 2017年2期 | Ezekiel Dare Olowolaju

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Isolation and characterization of the GbVIPl gene and response to Verticillium wilt ]n s cotton and tobacco

【摘要】Background: Verticillium wilt is a serious soil-borne vascular disease that causes major losses to upland cotton (Gossypium hirutum L.) worldwidely every year. The protein VIP1 {VirE2 interaction protein 1), a bZIP transcription factor, is involved in plant response to many stress conditions, especially pathogenic bacteria. However, its roles in cotton response to Verticillium wilt are poorly understood. Results: The GbVIPl gene was cloned from resistant sea-island cotton (G. barbodense) cv. Hai 7124. Expression of GbVIPl was up-regulated by inoculation with Verticillium dahliae and exogenous treatment with ethylene. Results of virus-induced gene silencing suggested that silencing of GbVIPl weakened cotton resistance to Verticillium wilt. The heterologous expression of GbVIPl in tobacco showed enhanced resistance to Verticillium wilt. The PR'S, PR 1-like and HSP70 genes were up-regulated in GbVIPl transgenic tobacco after Verticillium wilt infection. Conclusion: Our results suggested that GbVIPl increased plant resistance to Verticillium wilt through up-regulating expressions of W/, PR 1-like, and HSP70. These results provide new approaches to improving resistance to Verticillium wilt in upland cotton and also have great potential for disease-resistance breeding of cotton.

《棉花研究(英文)》 | 2018年4期 | ZHAO Pei+

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A Review of the History and Development of Integrated Pest Management (IPM)

【摘要】The evolvement of IPM has experienced several significant stages. IPM is an ecosystem as a governance unit. It allows the presence of low numbers of pests because a direct or indirect relationship between biological species and their associated environmental living conditions could keep a long-term ecological balance. IPM also emphasizes overall benefits; it is necessary to integrate all kinds of safe, effective, economic, and simple managements as far as possible. When synthesizing and coordinating various managements, effective control object, effective time limit, effective scope, and effective degree of the individual method should be analysed first. The ultimate goal of IPM is for the sustainable development of agriculture. In the future IPM system engineering, crop resistance, the role of natural enemies, agricultural control, and the application of biological control technologies will be greatly strengthened, and the role of chemical pesticides will be significantly reduced. Safe, effective, and long-lasting control of pest populations will be below the level of harm caused, which could protect the ecological environment and the health of people and livestock, and promote the development of production.

《Plant Diseases and Pests》 | 2019年2期 | Gong Deping

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Natural history of Valentin’s rock lizard (Darevskia valentini) in Armenia

【摘要】Valentin’s rock lizard (Darevskia va/entini) is suggested to be the parent for several parthenogenetic species (e.g., D. armeniaca, D. bendimahiensis, D. sapphirina, and D. unisexualis) that evolved through hybridization. Complex evolutionary processes (including reticulate evolution) are occurring within the areas where Valentin’s rock lizard coexists with these and other rock lizards. Hence, a detailed biological specification of this species is important for understanding how vertebrates evolve. Valentin’s rock lizard is a long- lived (up to 9 years), small diurnal lizard with larger females than males, which is unlike other species of the genus. Their relatively large eggs and early reproduction period, which occurs just after emergence from winter shelters, are adaptations for living in a high elevation climate (higher than 2 000 m a.s.l.). Their body temperatures (31-32 °C) are comparable to body temperatures of rock lizards living in milder climates, though female body temperature is more dependent on substrate temperature and basking due to their lower activity than that found in males. Population density fluctuates from several individuals to several hundred per hectare and is not affected by parthenogen coexistence, although hybrids do occur in sexually biased populations where males are more common than females. The male home range is larger than that of females, though these home ranges broadly overlap. Prey is not limited in the mountain meadows and Valentin’s rock lizards feed on a great variety of arthropods. Infanticide occurs in high-density populations.

《动物学研究》 | 2019年4期 | Eduard Galoyan

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Analysis of flow response to fluction of rotational speed in a radial impeller


《排灌机械工程学报》 | 2016年8期 | XIAO Jun

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Analysis of short fruiting branch gene and Marker-assisted selection with SNP linked to its trait in upland cotton

【摘要】<p>Background: With the rapid development of genomics, many functional genes have been targeted. Molecularmarker assisted selection can accelerate the breeding process by linking selection to functional genes.</p><p>Methods: In a study of upland cotton (Gossypium hirsutum L.), the F2 segregated population was constructed bycrossing X1570 (short branches) with Ekangmian-13 (long branches) to identify the short fruiting branch gene andmarker-assisted selection with SNP(Single Nucleotide Polymorphisms, SNP) linked to its trait.</p><p>Result: The result demonstrated that linked SSR marker BNL3232 was screened by BSA(Bulked segregant analysis,BSA) method; one SNP locus was found, which was totally separated from the fruiting branches trait in uplandcotton.</p><p>Conclusion: It was verified that this SNP marker could be used for molecular assisted selection of cotton architecture.</p><p><br/></p>

《棉花研究(英文)》 | 2018年1期 | ZHANG Youchang

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QTL mapping for fiber quality and yield- c^or related traits across multiple generations in UPdates segregating population of CCRI 70

【摘要】Background: Cotton is a significant economic crop that plays an indispensable role in many domains. Gossypium hirsutum L. is the most important fiber crop worldwide and contributes to more than 95% of global cotton production. Identifying stable quantitative trait locus (QTLs) controlling fiber quality and yield related traits are necessary prerequisites for marker-assisted selection (MAS). Results: A genetic linkage map was constructed with 312 simple sequence repeat (SSR) loci and 35 linkage groups using JoinMap 4.0; the map spanned 1 929.9 cM, with an average interval between two markers of 6.19 cM, and covered approximately 43.37% of the cotton genome. A total of 74 QTLs controlling fiber quality and 41 QTLs controlling yield-related traits were identified in 4 segregating generations. These QTLs were distributed across 20 chromosomes and collectively explained 1.01%?27.80% of the observed phenotypic variations. In particular, 35 stable QTLs could be identified in multiple generations, 25 common QTLs were consistent with those in previous studies, and 15 QTL clusters were found in 11 chromosome segments. Conclusion: These studies provide a theoretical basis for improving cotton yield and fiber quality for molecular marker-assisted selection.

《棉花研究(英文)》 | 2019年2期 | DENG Xiaoying

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