共查询到20条相似文献，搜索用时 343 毫秒
1.
在日光温室栽培条件下,为了提高土壤肥力和栽植葡萄的品质和产量,采用开沟、钻孔和深翻对土壤进行改良.结果表明:开沟、钻孔、深翻和增施有机肥后均提高了土壤肥力,葡萄根系数量、果实品质和产量.其中钻孔改良的土壤肥力、根系数量、果实品质、产量、成本和效率的综合效果最佳,葡萄单粒质量、穗质量、可溶性固形物含量、Vc含量和折合产量... 相似文献
2.
贵州几种常见野菜营养成分分析 总被引：6，自引：0，他引：6
以常规方法对毕节常见野菜(刺儿菜、野葱、香椿、小茴香、苣卖菜、牛皮菜、香菜、木耳菜、苦菜)的营养成分进行测定和比较分析.结果表明:在所测定的野菜中,苦菜的纤维、脂肪、维生素E、锰和铁的含量丰富;刺儿菜含有丰富的蛋白质、维生素A、胡萝卜素、钙和钾;苣卖菜含有丰富的维生素A、胡萝卜素、锰、镁、钾和铜;野葱含有丰富的维生素C、钙和钾;牛皮菜含有丰富的锌、钾和钠;而小茴香的钠含量最高;香椿的锌和磷含量最高;木耳菜的镁含量最高. 相似文献
3.
《中国果树》2017,(6)
以'寒富'为试材,研究了套餐肥和常规施肥对苹果树体生长发育、果实产量和品质的影响。结果表明:与常规施肥相比,套餐肥处理的土壤有机质、碱解氮、速效磷、速效钾、有效钙和有效镁的含量分别提高了12.2%、8.0%、11.4%、14.8%、14.9%和31.5%。与常规施肥相比,施用套餐肥的'寒富'树体高度和干径分别增加了7.3%和5.8%;新梢长度和单株新梢数量分别提高了8.3%和20.4%;叶面积、比叶鲜重和干重及叶绿素含量增幅分别为2.9%、7.1%、1.9%和3.4%;苹果叶片的N、P、K和Ca含量分别增加了9.3%、23.0%、55.6%和60.9%;果实着色指数、花青苷含量、维生素C含量、果肉硬度和可溶性固形物含量分别增加了7.1%、10.2%、5.7%、4.3%和9.3%;花序数量增加了14.1%;'寒富'产量显著提高,平均每667 m~2产量增加300.6 kg。 相似文献
4.
为了研究土壤中重金属含量对枸杞果实重金属含量的影响,采用电感耦合等离子光谱-质谱(ICP-MS)检测法,对全国6个宁夏枸杞主产区的土壤和果实中10种重金属元素(Pb、Cd、Cr、As、Ni、Sr、Li、Y、La、Co)进行测定和比较。结果表明:6个主产区土壤重金属含量存在一定的差异;其中,新疆产区的Cd、Cr、As、Li、Ni、Co、Sr和Y,宁夏产区的Pb和La,河北产区的Pb和La含量相对较高。6个主产区枸杞果实中Pb、As、Ni含量差异不显著,其它重金属元素含量差异显著;其中,宁夏产区果实的Cd和Sr,内蒙古和青海产区果实的Cr,甘肃产区果实的Li,河北和青海产区果实的La、Co和Y含量相对较高。果实中Cd和Sr含量分别与土壤中Pb、La、Li和Li、La呈显著正相关;果实中Y和La的积累分别与果实Co之间的积累具有一定协同作用。总体来看,不同产区土壤均适宜种植宁夏枸杞,枸杞中金属元素含量均未超出国家药材标准。 相似文献
5.
无论是《中国共产党章程》,还是党的历次全国代表大会和中央全会,都把学习、掌握和运用马克思主义(包括列宁主义、毛泽东思想、邓小平理论、"三个代表"重要思想和科学发展观)作为党员干部首要的义务、任职条件和基本要求,这是党的建设规律和党的历史正反经验决定的。 相似文献
6.
为建立中国南方李果实品质综合评价方法和为南方李种质资源开发利用和品种改良提供参考，对近年来南方主栽的8个李品种果实(芙蓉李、胭脂李、红李、秋姬李和黑琥珀李采自福建古田，华蜜大蜜李、白脆鸡麻李和红线李采自广东翁源)基本性状(单果质量、大小、硬度和可溶性固形物含量)和营养品质(总酚、花青苷和类黄酮含量，可溶性糖组分和含量，有机酸组分和含量)进行测定和分析评价。结果表明，品种间的果实单果质量、大小、硬度、可溶性固形物含量、总酚含量、花青苷含量、类黄酮含量、可溶性糖含量和有机酸含量存在显著差异。葡萄糖、果糖和蔗糖是成熟李果实主要的可溶性糖。主要有机酸是苹果酸，其次为柠檬酸和异柠檬酸，其他有机酸包括草酸、酒石酸、琥珀酸和富马酸，品种间总有机酸含量差异趋势与苹果酸含量差异趋势基本一致。对8个李品种果实的20个主要营养指标进行主成分分析的结果显示，第一主成分PC1和第二主成分PC2分别包含了原来信息的32.07%和24.93%,果皮色泽、果肉硬度和可溶性固形物含量是评价李果实品质的重要指标。在8个品种中，芙蓉李果实的总酚、花青苷和可溶性糖含量最高，有机酸含量最低，可作为进一步选育优质李新品种的亲本材... 相似文献
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9.
综述了大蒜（Allium sativum L.）分子生物学的研究进展,主要包括5个方面：（1）大蒜遗传多样性分析、遗传图谱构建和资源评价中基因组7种分子标记（RAPD、AFLP、ISSR、SSR、SRAP、InDel和SNP）的开发和利用;（2）大蒜基因组学、表观遗传分析、转录组学和蛋白组学的研究;（3）农杆菌介导法和基因枪法的大蒜遗传转化体系构建;（4）大蒜蒜氨酸酶基因、蒜薹和鳞茎发育基因（gaLFY、AsPI、AsFT1、AsFT2和AsFT4）及抗逆相关基因（AsPCSl、AsMT2a、ASAL和AsNF-YC8）的克隆和表达分析;（5）大蒜分子生物学试验技术（RNA提取、RT-qPCR的内参基因筛选和BAC文库构建）优化。最后指出了当前研究的不足,展望了大蒜分子生物学研究的方向。 相似文献
10.
《中国瓜菜》2016,(9):13-17
以黄瓜为试材,研究不同深翻深度对设施黄瓜生长和产量的影响。以添加秸秆不深翻为对照,进行深翻30、50、80 cm的3种处理方式,在初花期、结果前期、中期和后期测定生长指标及产量指标。结果表明,深翻可以提高黄瓜叶片数、叶面积指数、结果中后期的植株高度和茎粗度、结果前中后期的光合速率、结果中后期的根系数和根体积、20~40 cm土层中根的比例及产量。在结果中期和后期,尤以深翻50 cm对植株生长的提高效果最为显著,可显著提高叶片数12.20%和38.82%、叶面积指数16.67%和30.65%、植株高度22.98%和19.63%、茎粗度10.00%和6.52%、净光合速率50.33%和55.03%、胞间二氧化碳浓度30.47%和29.88%、蒸腾速率25.97%和31.35%、根系数48.01%和35.30%。50 cm深翻可显著增加20~40 cm土层中根的分部35.29%,黄瓜单株产量提高23.05%,总产量提高17.63%。因此,设施黄瓜栽培中50 cm深翻在生产实践中推广价值较大。 相似文献
11.
Residential properties in the United States represent a considerable amount of land area and contain substantial tree cover. Homeowners are important decision makers in the management of city trees because they influence the structure of urban forests, and ultimately, ecosystem service potential. To better understand the perceptions, knowledge, and practices of homeowners regarding residential tree preservation, we surveyed owners of newer versus older homes in a midwestern suburb in the United States. We found that newer homeowners were younger, wealthier, and less knowledgeable about the natural aspects of their property. During the redevelopment process, they relied on professionals to make major decisions regarding tree preservation. In contrast, owners of older homes often identified as retirees and gardeners, had more knowledge of the natural aspects of their property, and were more likely to hire an arborist. Regardless of these differences, both homeowner groups expressed equal appreciation for nature, planted, pruned, and mulched their trees, experienced tree loss, hired landscaping and tree care professionals, and communicated with the City’s Forestry Section. The results of our study further clarify the role that homeowners play in decision-making during development and highlight the important relationships that exist between homeowners and urban forest professionals. 相似文献
12.
以新疆阿克苏地区水心（冰糖心）富士苹果为试材,分析讨论了果实碳水化合物、矿质元素和活性氧代谢与水心发生的关系。结果表明：果实可溶性固形物（SSC）含量越高,水心指数越高,呈显著正相关（P < 0.05）;而单果质量、果实纵横径比及L、b*、h°值与水心果率和水心指数相关不显著;进一步分析发现,与正常果实和组织相比,水心果实和组织中,山梨醇和蔗糖含量均显著升高,尤其是山梨醇含量,分别是正常果实和组织的2.19倍和2.86倍,果糖和葡萄糖含量相对较低;此外,水心组织中K和B含量显著高于正常组织,而Ca、Zn及Fe含量则显著降低;同时,水心果实和组织中超氧阴离子和过氧化氢含量较正常果实和组织显著升高,分别高282.39%、68.17%和12.6%、107.62%;POD、SOD和CAT等抗氧化酶活性显著降低,MDA含量和相对电导率显著升高,膜质过氧化水平严重。 相似文献
13.
AIM：To establish and evaluate a hyperbilirubinemia and kernicterus model in neonatal SD rats. METHODS：Three-day-old SD rats were randomly divided to 7 experimental groups by litter and body weight, and were intraperitoneally injected with physiological saline (control group), and 6.25 μg/g (T1), 12.5 μg/g (T2), 25 μg/g (T3), 50 μg/g (T4), 100 μg/g (T5) and 200 μg/g (T6) bilirubin, respectively, twice every day for 3 d. All rats were photographed, weighed and killed 12 h after the last injection. The contents of the stomach were drawn and weighed, and the index was calculated. The liver/body weight ratio was determined, the total and unconjugated bilirubin in the serum and total bilirubin in the brain were calculated, and the contents of ATP and water in the brain were measured. HE and Nissl staining were used to observe the pathological changes. RESULTS：Along with the increase in bilirubin, gradual exacerbation of the general performance of the rats, and yellowish discoloration of the skin and mucous membranes were observed.The degree of the activity gradually reduced, and the weight gain was suppressed. The weight of T6 group showed negative growth, and the 72 h mortality rate was close to 100%. The mortality rate in T4 and T5 groups continued to rise 1 week after injection. Compared with control group, the weight of stomach contents and stomach content index in T3~T5 groups significantly decreased (P<0.01). The liver/body weight ratio in T5 group was significantly higher (P<0.05). The concentrations of serum total and unconjugated bilirubin and brain bilirubin levels in T1~T5 groups were gradually increased, while the brain water content had no difference among groups. The brain ATP content in T1~T5 groups increased at the beginning and reached its peak in T3 group, but compared with control group, that in T4 group and T5 group significantly reduced (P<0.05). HE results showed that, with the increase in bilirubin concentration, the number of the neurons in the cerebral cortex of the rats decreased. In T4 group and T5 group, the neuronal structural disorder, cell swelling, nuclear pyknosis, fragmentation and dissolution, increase in non-homogeneous structure of the material dyed red, and disappearance of nuclear staining were observed. Nissl staining showed that, compared with control group, in T1 group and T2 group, the cortical neurons became smaller, Nissl bodies decreased, and cytoplasmic staining changed little. The cortical neuronal tigroid body color became light gradually, neuron cells become small, and Nissl bodies decreased obviously in T3, T4 and T5 groups. The T4 and T5 rat ce-rebral cortical neurons dissolved or even disappeared. CONCLUSION：Newborn 3-day-old SD rats receiving intraperitoneal injection of bilirubin at doses of 12.5, 25, 50 and 100 μg/g, 2 times a day, can induce hyperbilirubinemia, and 50 and 100 μg/g can cause bilirubin encephalopathy. 相似文献
14.
Dimitrios Savvas Golgen Bahar Öztekin Mahmut Tepecik Andreas Ropokis Yuksel Tüzel Georgia Ntatsi 《The Journal of Horticultural Science and Biotechnology》2017,92(3):294-302
Tomato plants (cv. Primadonna F1), non-grafted, self-grafted, or grafted onto the commercial rootstocks ‘He-man’ and ‘Maxifort’, were grown in recirculating nutrient solution. The uptake concentrations (UCs), i.e. mean nutrient-to-water uptake ratios of N, P, K, Ca, Mg, Fe, Mn, Zn, Cu, and B, were estimated based either on depletion from the nutrient solution or on accumulation in the plant biomass. Grafting onto both commercial rootstocks increased the total plant biomass. Hetero-grafting also increased the leaf N, Ca, and Cu concentrations but decreased those of Mg and Fe in comparison with self- and non-grafted plants. The mean UCs of N, Ca, and Cu were higher in plants grafted onto both commercial rootstocks in comparison with self- and non-grafted plants. However, hetero-grafting also raised the UCs of P, Fe, Mn, and B, because of an increased deposition of these nutrients to the roots in comparison with self-rooted plants. The method used to estimate the UCs, i.e. nutrient removal from the recirculating nutrient solution vs. nutrient recovery from plant biomass per volume unit of transpired water, resulted in similar values for N, Ca, Zn, and Cu, but had a significant impact on those of P, K, Mg, Fe, Mn, and B. 相似文献
15.
药用蒲公英低温和高温胁迫下内参基因筛选与相关基因表达分析 总被引：1，自引：0，他引：1
为研究不同温度胁迫下药用蒲公英最适内参基因与温度响应相关基因的表达,分别以低温（4 ℃）和高温（38 ℃）胁迫0、3、6、12、24和48 h共12个处理的叶片为材料,选取10个候选内参基因18S、EF1α、TUB、40S、GAPDH、β-actin、ACT11、TUA、60S和SKIP,利用RT-qPCR技术以及geNorm、NormFinder和BestKeeper软件评价其稳定性。利用筛选出的最适内参基因对药用蒲公英12个温度响应基因（AP2/ERF、Dof、ICE1、MYB、bZIP、NTL6、HSF、Gols、HSP、NAC、XCT和WRKY）的表达水平进行定量分析。结果显示：温度胁迫下药用蒲公英最适内参基因为18S和GAPDH;药用蒲公英AP2/ERF、HSF、Glos、HSP、NAC、XCT基因在低温和高温胁迫下均为先上调后下调表达,bZIP、NTL6在温度胁迫下波动变化,Dof、ICE1、MYB在低温胁迫下先上调后下调表达,高温胁迫下持续下调表达,WRKY在高温胁迫下表达量远远高于低温胁迫。依据基因表达量推测,药用蒲公英低温和高温胁迫的响应机制存在差异,AP2/ERF、Dof主要响应低温胁迫,HSF、XCT、WRKY主要响应高温胁迫。 相似文献
16.
桂花（Osmanthus fragrans Lour.）野生资源有非常丰富的性状和遗传变异,但目前被过度开发、破坏,导致分布范围急剧缩小,种群规模和数量锐减,生境片断化严重。以往的文献认为桂花起源于喜马拉雅山脉东段,即中国的西南地区;然而随着野生种群在湖南、浙江和福建等地被陆续发现,关于桂花自然分布的问题需要重新审视。作者在大量野外调研的基础上,结合前人研究结果,对桂花的自然分布和种群特征等进行了总结和概括,分析了野生资源与品种起源的关系,以期为桂花野生资源的有效保护和高效利用提供参考。 相似文献
17.
草莓品种对蚜虫的抗性机制 总被引：1，自引：1，他引：0
为探讨草莓品种对蚜虫的抗性机理,以5个常规草莓品种为试材,通过调查、测定大棚内蚜虫自然发生动态和室内人工接虫后种群变化,并对草莓叶片的形态学和生理学特性与抗蚜性的关系进行了分析。结果表明章姬对蚜虫高感,丰香感,卡姆罗莎和吐德拉抗,弗吉尼亚高抗。草莓品种对蚜虫抗性与叶片背面的茸毛密度成正相关,与气孔密度呈显著负相关;与叶片的木质素含量成正比;与酚类物质含量无显著关系,与总游离氨基酸、可溶性固形物含量和水分含量无明显的线性关系。但草莓对蚜虫的抗性程度与叶片中脯氨酸、缬氨酸和胱氨酸的含量有关,特别是缬氨酸和胱氨酸在感蚜品种中的含量是抗蚜品种中的2～3倍。 相似文献
18.
锥栗种仁发育期叶片与果实矿质元素含量变化 总被引：1，自引：0，他引：1
以‘长芒仔’锥栗为试材,对其种仁发育期营养枝叶片、结果枝叶片及果实（种仁、刺苞、果皮 + 种皮）中N、P、K、Ca、Mg、Mn、Fe、Zn、Cu 矿质元素含量及果实不同组织质量变化进行分析。结果表明：坚果从幼胚发生期至成熟期为种仁发育的关键时期,坚果、种仁和淀粉干质量较前期都有显著增长,分别增加了6.14 g（92.4%）、4.97 g（99.43%）及3.82 g（99.92%）。在种仁发育期,营养枝及结果枝叶片中Cu 含量呈显著下降变化,P、Zn 含量波动上升;果实刺苞中Ca、Fe、Cu 含量显著下降,Zn 含量上升后下降,其余元素变化甚微;果皮 + 种皮中N、P、K、Mg、Cu 含量前期变化甚微,后期显著下降,Ca、Zn 含量先增加后降低;种仁中N、P、K、Ca、Mg、Mn、Fe、Zn、Cu 含量均呈降低变化,种仁中各元素总量均呈显著上升趋势,在采收前1 周Ca、Mg、Mn、Fe、Cu 总量呈明显降低。种仁内淀粉总量与结果枝叶片及营养枝叶片中Cu 含量,刺苞中Cu 含量,果皮 + 种皮中K、Mn 含量呈显著负相关;与刺苞中Fe 含量,果皮 + 种皮中P、Mg、Cu 含量呈极显著负相关;而与种仁中的N、P、K、Mg、Mn、Fe、Zn、Cu 总量极显著正相关。 相似文献
19.
Tardigrade communities are affected by micro and macro-environmental conditions but only micro-environmental variables, and
altitudinal gradients have been studied. We review previous reports of altitudinal effects and evaluate the influence by interacting
macro- (climate, soils, biome, and others) and micro-environmental (vegetation, moss and leaf litter) factors on tardigrade
assemblages at the Sierra de Guadarrama mountain range (Iberian Central System Mountains, Spain). Terrestrial tardigrade assemblages
were sampled using standard cores to collect leaf litter and mosses growing on rocks. General Linear Models were used to examine
relationships between Tardigrada species richness and abundance, and macro- and micro-environmental variables (altitude, habitat
characteristics, local habitat structure and dominant leaf litter type, and two bioclimatic classifications). Variation partitioning
techniques were used to separate the effects of altitude and habitat variation, and to quantify the independent influences
of climate and soil, vegetation structure and dominant type of leaf litter. Altitude shows a unimodal relationship with tardigrade
species richness, although its effect independent of habitat variation is negligible. The best predictors for species richness
were bioclimatic classifications. Separate and combined effects of macro-environmental gradients (soil and climate), vegetation
structure and leaf litter type are important determinants of richness. A model including both macro- and micro-environmental
variables explained nearly 60% of tardigrade species richness in micro-scale plots. Abundance was significantly related only
to soil composition and leaf litter type. Tardigrade abundance was not explained by macro-environmental gradients analysed
here, despite a significant correlation between abundance and richness. 相似文献
20.
油蟠桃组合遗传连锁图谱构建及糖酸性状QTL分析 总被引：3，自引：1，他引：2
以油桃和油蟠桃组合‘霞光’‘NF’杂交群体115个单株为试材,使用高效液相色谱测定亲本及各单株果实糖和有机酸含量,筛选164对SSR引物和2 304对SRAP引物组合,选择符合1︰1分离比例的标记,使用Map Manager QTX20b软件的BC1模型构建遗传图谱,并对8个符合正态分布的性状进行与标记间的回归分析以及QTL区间分析。构建的图谱经与李属SSR参考图谱比对,发现基本匹配的8个连锁群总长度为1 232.7 cM,位点间的平均遗传距离为9.34 cM,包含22个SSR标记和108个SRAP标记,以及扁平果形（S）和非酸（D）两个位点。QTL区间扫描发现,LOD≥2的QTL区间共有28个,LOD≥3的有17个,LOD≥5的有10个。风味相关的QTL分布在Group 1、2、4、5、6连锁群上。Group 1含4个QTL区间（Glu2、Sor2、Tsug4、SSC3）;Group 2含3个QTL区间（Glu4、Sor3、SSC4）;Group 4含5个QTL区间（Suc2、Glu3、Glu5、Tsug5、Taci4）;Group 1、2、4的QTL均对相应性状均表现为负加性效应;Group 5含6个QTL区间（Suc1、Suc3、Tsug3、Mal1、Taci3、Taci5、）,大多集中在非酸位点（D）附近,均表现为对糖含量的正加性效应,对酸含量的负加性效应;Group 6含9个QTL区间（Glu1、Fru1、Sor1、Tsug1、Tsug2、Taci1、Taci2、SSC1、SSC2）,所有QTL均对相应性状呈正加性效应。 相似文献