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笋用竹害虫天敌资源研究 总被引:1,自引:0,他引:1
本文报道了浙江省笋用竹害虫天敌资源调查的结果,共查明天敌资源44种,经鉴定属于螳螂目1科2种,半翅目1科2种,蛇蛉目1科1种,脉翅目1科2种,鞘翅目2科9种,双翅目2科2种,膜翅目9科22种;蛛形纲蜱螨目1科1种,蜘蛛目3科3种,指出了天敌的寄主和分布。 相似文献
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Melatonin reduces apoptotic cells,SOD2 and HSPB1 and improves the in vitro production and quality of bovine blastocysts 下载免费PDF全文
TC Marques EC da Silva Santos TO Diesel LO Leme CF Martins MAN Dode BG Alves FPH Costa EB de Oliveira ML Gambarini 《Reproduction in domestic animals》2018,53(1):226-236
Effects of adding different concentrations of melatonin (10?7, 10?9 and 10?11 M) to maturation (Experiment 1; Control, IVM + 10?7, IVM + 10?9, IVM + 10?11) and culture media (Experiment 2; Control, IVC + 10?7, IVC + 10?9, IVC + 10?11) were evaluated on in vitro bovine embryonic development. The optimal concentration of melatonin (10?9 M) from Experiments 1–2 was tested in both maturation and/or culture media of Experiment 3 (Control, IVM + 10?9, IVC + 10?9, IVM /IVC + 10?9). In Experiment 1, maturated oocytes from Control and IVM + 10?9 treatments showed increased glutathione content, mitochondrial membrane potential and percentage of Grade I blastocysts (40.6% and 43%, respectively). In Experiment 2, an increase in the percentage of Grade I blastocysts was detected in IVC + 10?7 (43.5%; 56.7%) and IVC + 10?9 (47.4%; 57.4%). Moreover, a lower number and percentage of apoptotic cells in blastocysts were observed in the IVC + 10?9 group compared to Control (3.8 ± 0.6; 3.6% versus 6.1 ± 0.6; 5.3%). In Experiment 3, the IVC + 10?9 treatment increased percentage of Grade I blastocysts with a lower number of apoptotic cells compared to IVM /IVC + 10?9 group (52.6%; 3.0 ± 0.5 versus 46.0%; 5.4 ± 1.0). The IVC + 10?9 treatment also had a higher mRNA expression of antioxidant gene (SOD 2) compared to the Control, as well as the heat shock protein (HSPB 1) compared to the IVM + 10?9. Reactive oxygen species production was greater in the IVM /IVC + 10?9 treatment group. In conclusion, the 10?9 M concentration of melatonin and the in vitro production phase in which it is used directly affected embryonic development and quality. 相似文献
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Quadratic fitting was used to regress semen characteristics of 1441 samples consisting of 12‐month collection from 58 Duroc boars against animal age varied from 10 to 80 months. Data was divided into two groups of cool (14.0–22.7°C, RH 81.5%) and hot season (22.9–29.9°C, RH 86.6%), to test effects of age, season and their interactions. Results revealed that young boars of around 1 year old could endure the hot season. The endurance gradually diminished as animals grew. In the hot season animals exhibited peak performance at age around 33 month and it remained for 1 month, while cool‐season kept boars could last for 48 months from 16 months old onward. The reproductive longevity should be 51 month in a subtropical environment and it may extend to 70 month if heat stress can be avoided. The estimated total sperm contribution of a Duroc boar would be 1.8 times more when kept below 22°C than in a natural subtropical environment. It is concluded that to maintain Duroc boars as semen donor to at least 4 years of age is feasible in a subtropical environment and boar longevity could reach 6 years old if well kept in a temperate region. 相似文献
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Trichoderma spp. are widely used in agriculture as biofungicides. In this study, effects of elevated CO2 on the growth and enzyme activities of Nilaparvata lugens infected by T. asperellum were studied. The results showed that fecundity of N. lugens adversely decreased under elevated CO2 relative to ambient CO2 irrespective of infection with T. asperellum. The contents of protein and alkaline phosphatase significantly decreased in N. lugens nymphs with T. asperellum infection under elevated CO2 relative to ambient CO2. Significantly higher activities of carboxylesterase and acetylcholinesterase were observed in N. lugens infested with T. asperellum under elevated CO2 compared with ambient CO2. While significantly lower catalase and glutathione S-transferase were observed in N. lugens nymphs infested by T. asperellum under elevated CO2 relative to ambient CO2. Measuring the antioxidases and detoxification enzymes in N. lugens infected with T. asperellum can partly explain the response of fitness parameters of N. lugens under elevated CO2. 相似文献
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