日光温室有机土壤栽培对番茄生长、产量和品质的影响

在日光温室番茄生产中以普通土壤栽培为对照,研究以由腐熟油菜秆、腐熟小麦秆、腐熟羊粪和洁净土壤配制成的有机土壤中番茄生长、生理特性、产量和品质的变化.研究结果表明,有机土壤栽培的番茄生长势好,株高与茎粗均显著优于普通土壤,其营养品质如总糖、番茄红素含量明显优于普通土壤栽培的,而有害物硝酸盐含量低于土壤栽培的.因此番茄有机...     

矮化富士苹果树冠不同部位果实品质分析

以矮化富士苹果树为试材,采集不同树冠方位果实,对品质进行测定及分析。研究了苹果矮化栽培模式对不同树冠方位果实品质的影响。以期明确矮化苹果不同树冠方位果实品质性状差异,为进一步改造老果园及优化树体结构提供参考依据。结果表明:外在及内在品质中上部优于下部,东南部优于西北部;大量及微量元素中下部优于上部,水平方向无明显规律。     

秸秆还田条件下水稻-蔬菜轮作对土壤细菌群落的影响

为了探明海南地区秸秆还田条件下水稻-蔬菜轮作对土壤细菌群落的影响,通过设置水稻-水稻(SS)、水稻-青瓜(SQ)和水稻-黄秋葵(SH)3个处理,经持续2年的田间试验,采用Illumina平台HiSeq高通量测序技术测定并比较了土壤细菌群落的差异,分析了其与土壤理化性质的关系。结果表明:1)测序共获得347 544条读数,平均长度436bp,计16 094个OTUs。SS处理土壤含有的OTUs最多,分别较SQ和SH处理高出7.8%和9.4%。2)3个处理土壤细菌丰富度无显著(P0.05)差异,水稻-青瓜轮作(SQ)会降低土壤细菌多样性,提高细菌优势度。3)水稻-蔬菜轮作使厚壁菌门(Firmicutes)和芽单胞菌门(Gemmatimonadetes)的相对丰度升高,绿弯菌门(Chloroflexi)和酸杆菌门(Acidobacteria)的相对丰度降低;增加了放线菌纲(Actinobacteria)、芽孢杆菌纲(Bacilli)、芽单胞菌纲(Gemmatimonadetes)、γ-变形菌纲(Gammaproteobacteria)和热微菌纲(Thermomicrobia)的相对丰度,降低了酸杆菌纲(Acidobacteria)、β-变形菌纲(Betaproteobacteria)和纤线杆菌纲(Ktedonobacteria)的相对丰度。4)变形菌门和放线菌门的相对丰度与土壤电导率(EC)和有效磷含量(AP)正相关,与C/N负相关;绿弯菌门和酸杆菌门的相对丰度与土壤pH、C/N正相关,与土壤有机质(OM)和碱解氮(AHN)含量负相关。     

铁皮石斛组培苗耐盐性研究

以铁皮石斛为外植体诱导出愈伤组织后,分别接种到不同盐浓度的愈伤增殖、茎叶分化和生根3种培养基中进行耐盐性筛选,30 d后进行脯氨酸含量测定。结果表明:在培养基中,NaCl浓度在0.2%～1.0%范围内,对铁皮石斛的愈伤增殖、茎叶分化和生根均产生抑制作用,并且盐浓度越高,脯氨酸含量也随之升高,抑制作用越大。盐浓度达0.6%时,愈伤诱导受害明显,脯氨酸含量是对照组的3.60倍;盐浓度高于0.5%时,盐胁迫对不定根和茎叶分化诱导更显著。     

Influence of Tangshen formula on endothelial function and hemorheology in diabetic nephropathy rats

ATM: To explore the influence of Tangshen formula (TS) on endothelial function and blood rheology in diabetic nephropathy (DN) rats. METHODS: The DN rat model was established by intravenous injection of low-dose (30 mg/kg) streptozotocin (STZ) after having the high-fat/high-glucose diets for one month. The animals were divi-ded into DN model group, TS group and valsartan group. Fasting blood glucose (FBG), serum total cholesterol (TC), serum triglyceride (TG), renal cortex blood flow and hemorheology were monitored. The content of von Willebrand's factor (vWF) and plasminogen activator inhibitor-1 (PAI-1) in the serum was determined by ELISA. RESULTS: Compared with normal group, FBG,TC,TG, vWF and PAI-1 were increased in DN model group (P<0.05), and no significant difference of FBG was observed. Compared with normal group, plasma viscosity, Casson viscosity, whole blood high/medium/low-shear viscosity, erythrocyte aggregation index, erythrocyte rigidity index and erythrocyte electrophoresis time were increased, and erythrocyte deformation index was decreased in DN model group (P<0.01). Compared with DN model group, plasma viscosity, Casson viscosity, whole blood high/medium/low-shear viscosity, erythrocyte aggregation index, erythrocyte rigidity index and erythrocyte electrophoresis time were decreased (P<0.05), but there was no significant difference for erythrocyte deformation index in TS group. Compared with normal group, the renal cortex microcirculation blood flow in DN model group was significantly decreased. Compared with DN model group, the renal cortex microcirculation blood flow was significantly increased in TS group (P<0.05), and no significant change in valsartan group was found.CONCLUSION: Tangshen formula plays a protective role in the kidney of diabetic rats by improving the blood rheology and endothelial function, thus ameliorating the renal cortex microcirculation blood flow in experimental diabetic rats.     

蚕豆根尖细胞微核试验对水质检测的研究

以南水北调中线水源区丹江口水库水体为检测对象和试验材料,在2007年6月选取3个采样点进行水体采集和理化检测,水体浓缩为低、中、高3个剂量组,以自来水处理为阴性对照组,以CrO3处理为阳性对照组,利用蚕豆根尖进行了5组不同的细胞微核试验。水体理化检测表明水质有一定的污染。微核试验表明,5组间都有显著差异。分析得出:蚕豆根尖细胞微核试验对水质检测是非常有效简单易行的方法,值得推广;丹江口水库水质有污染,但尚不严重,有待改善,并做好长期监测和研究。     

电控电执行器自动变速器的开发研究

从电控电执行器自动变速器的结构、工作原理及设计要点出发,对电控电执行器自动变速器的开发进行了研究,并对其执行机构电磁离合器的开发做了重点阐述。结合中国变速器的现状,对在中国进行电控电执行器自动变速器开发的可行性进行了论述。     

Somatic embryogenesis and histological analysis from zygotic embryos in Vitis vinifera L. ''Moldova''

We examined the somatic embryogenesis from and histological studies of zygotic embryos of seeds in European Grape 'Moldova' (Vitis vinifera L. 'Moldova'). Primary calli were initiated on Nitsch and Nitsch (NN) medium supplemented with 1.0mg'L-1 2,4-D and 0.5 mg'L-1 6-BA. Embryogenic calli were produced upon transfer to a NN medium with 0.5 mg-L-1 6-BA and 2 mg.L-1 NAA and somatic embryos were obtained on a half strength MS medium without plant growth regulators. During the somatic embryo germination, an addition of 1.0 mg.L-1 6-BA in the medium could accelerate somatic embryos to develop into normal plants and increase the conversion rate from 0 to 43.3%. Histological studies of embryogenic calli and somatic embryos demonstrated dy-namic changes of proteins and starch grains. The developmental processes of somatic embryos were similar to those of zygotic em-bryos, including typical epiderma, cotyledon primordium and vascular tissue.     

几种地被植物抗逆性比较

有关野生地被植物在城市绿化中应用方面的研究愈来愈受到重视。目前对野生地被植物研究已取得了很多成果,并得到推广。本文就部分北京地区野生地被植物的耐旱耐热性进行了初步分析,结果表明植物的抗旱性从强到弱依次为:甘野菊、青杞、旋覆花、连钱草、大叶铁线莲、委陵菜、蛇莓、匍枝委陵菜。其抗热性从强到弱依次为:委陵菜≈匍枝委陵菜、旋覆花、甘野菊、连钱草、玉竹、蛇莓、青杞、大叶铁线莲、匍枝毛茛。以上研究结果为其在北京地区乃至其他地区的推广应用提供了理论基础,同时为地被植物的相关研究提供了可借鉴的方法。     

水力测功器制动扭矩的影响因素

介绍了水力测功器的基本工作原理，分析了测功器中的水环圆周运动和环流运动，推导出水力测功器制动扭矩方程，总结了影响水力测功器制动扭矩的因素．