干椒新品种蓉椒6号的选育

自交系9804和9909杂交配制成杂交一代干椒，植株生长旺盛，座果力强，较抗病毒病和疫病，果实指形，纵长17～19cm，横径1．2cm，青熟果绿色，老熟果鲜红色，单果重8．3g，味辣，品质佳，中熟品种，从定植到采收55d(天)，一般每667m^2产1500～1900kg。     

内燃机燃烧模型的发展现状

利用CFD技术对内燃机燃烧过程进行数值模拟已成为内燃机研究的重要工具。选用恰当的燃烧模型对准确预测内燃机燃烧过程具有重要意义。内燃机CFD燃烧模型主要针对自燃、预混燃烧和非预混燃烧3种燃烧模式,其中有些模型可以同时模拟2种模式或3种模式。内燃机新的燃烧系统的不断出现促进了燃烧模型的发展。本文以STAR—CD和FIRE软件为出发点,介绍了内燃机燃烧模型的发展现状。     

Exploring the effectiveness of in ovo feeding of vitamin C based on the embryonic vitamin C synthesis and absorption in broiler chickensOA

Background: Many researches about in ovo feeding(IOF) of vitamin C(VC) are gradually carried out to explore physiological development in chicken, but little studies focus on VC synthesis capacity of the embryo itself, the selection of injection site and the effectiveness of IOF of VC. This study aims to explore the above problems.Results: Kidney and yolk sac were the main organs for VC synthesis and L-gulonolactone oxidase(GLO) expression was lower during pre-hatch development than that during p...     

Greenhouse gas emissions in response to straw incorporation,water management and their interaction in a paddy field in subtropical central China

A field experiment was conducted to study the effects of combination of straw incorporation and water management on fluxes of CH₄, N₂O and soil heterotrophic respiration (Rh) in a paddy field in subtropical central China by using a static opaque chamber/gas chromatography method. Four treatments were set up: two rice straw incorporation rates at 0 (S1) and 6 (S2) t ha^?1 combined with two water managements of intermittent irrigation (W1, with mid-season drainage) and continuous flooding (W2, without mid-season drainage). The cumulative seasonal CH₄ emissions for the treatments of S1W2, S2W1 and S2W2 increased significantly by 1.84, 5.47 and 6.63 times, respectively, while seasonal N₂O emissions decreased by 0.67, 0.29 and 1.21 times, respectively, as compared to S1W1 treatment. The significant increase in the cumulative Rh for the treatments S1W1, S2W1 and S2W2 were 0.54, 1.35 and 0.52 times, respectively, in comparison with S1W2. On a seasonal basis, both the CO₂-equivalents (CO₂e) and yield-scaled CO₂e (GHGI) of CH₄ and N₂O emissions increased with straw incorporation and continuous flooding, following the order: S2W2>S2W1>S1W2>S1W1. Thus, the practices of in season straw incorporation should be discouraged, while mid-season drainage is recommended in paddy rice production from a point view of reducing greenhouse gas emissions.     

柑桔黑斑病的发病特点及检测方法研究进展

柑桔黑斑病(Citrus Black Spot,CBS)是一种真菌性病害,主要为害果实,并产生褐色斑点,严重时蔓延至全果,造成果实腐烂,显著影响果实的品质和外观,降低经济价值,被欧美等国列为重要的检疫性病害,近年来该病在我国一些柑桔产区已上升为主要病害。本文主要从柑桔黑斑病的病原菌、发病特点及检测方法等几个方面进行简要的概述。     

做强蔬菜产业,推进新农村建设——璧山县新堰村新农村建设的实践与思考

璧山县新堰村在推进新农村建设过程中,把蔬菜作为支撑产业千方百计做大做强,以完善基础设施夯实发展基础,以优化产业结构挖掘发展潜力,以完善服务体系提供发展支持,推动了经济社会全面发展,为纯农业村推进新农村建设找到了一条可值得借鉴的成功之路.并就建设社会主义新农村总结出3点经验,一是有一个好的产业作支撑,二是有坚强的领导作保证,三是有一套好的机制作保障.     

外源甜菜碱对渗透胁迫下巴西蕉幼苗生长和生理的影响

通过叶面喷施10 mmol/L甜菜碱预处理24 h后,以100 mmol/L甘露醇灌根模拟渗透胁迫,测定巴西蕉幼苗胁迫处理不同时间后其叶片和根中的MDA含量、抗氧化酶活性、渗透调节物质含量、光合特性等生理指标,分析外源甜菜碱对渗透胁迫下巴西蕉幼苗生长和生理的作用机制。结果表明：外源甜菜碱可显著降低渗透胁迫下巴西蕉幼苗叶片和根中MDA积累量,提高巴西蕉幼苗叶片和根中SOD、POD和CAT等抗氧化酶活性,显著提高渗透调节物质可溶性糖、可溶性蛋白的合成积累量。叶片中叶绿素含量和类胡萝卜素含量都显著上升并减缓渗透胁迫下叶绿素和类胡萝卜素含量下降,显著提高渗透胁迫下叶绿素荧光参数,并减缓F_v/F_m、Y_II、ETR、Y_NPQ和Y_NO等叶绿素荧光参数的变化。因此,外源甜菜碱能有效缓解巴西蕉的渗透胁迫,提高巴西蕉的抗逆性。     

基于SRAP分子标记的11份柑橘种质材料遗传多样性分析

为分析11份柑橘种质材料的遗传多样性,本研究以7份沙糖橘种质以及4份其他柑橘种质为试验材料,利用SRAP分子标记进行分析,并用UPGMA法进行聚类.结果表明:160对引物组合筛选出20对引物组合扩增条带清晰,11份种质材料两两之间遗传相似系数在0.322 1～0.931 6之间.沙糖橘和金葵蜜橘间的遗传相似系数最大,为...     

莰酮对蚜虫生物活性的研究

进行了樟树(CinnamomumcamphoraL.)中的莰酮(CamphorC10H160)对蚜虫的触杀、熏蒸毒力和拒食活性研究。结果表明,处理后24h莰酮对菜缢管蚜、桃蚜和棉蚜触杀作用的LD50分别为3.12×10-3,2.04×10-3,0.68×10-3 ng/头,熏蒸作用的LC50分别为3.44,2.56,1.06mg/L,拒食作用的AFC50分别为3.34,2.98,1.32mg/L。经回归和相关分析,处理浓度与作用效果相关性均达到极显著或显著水平。莰酮在田间防治菜缢管蚜的效果显著。