Effects of silicon application on drought resistance of cucumber plants     

Cheng Cang Ma  Qing Fang Li  Tian Rong Xin 《Soil Science and Plant Nutrition》2013,59(5):623-632

A study on the effects of silicon supply on the resistance to drought in cucumber plants was conducted in pot experiments. The results suggested that in the absence of stress, silicon slightly enhanced the net photosynthetic rate, but significantly decreased the transpiration rate and stomatal conductance in cucumber plants. Silicon enhanced the net photosynthetic rate of cucumber plants under drought stress. Since silicon decreased the stomatal conductance, enhanced the capacity of holding water, and kept the transpiration rate at a relatively steady rate during drought stress, the photosynthesis of the cucumber plants was sustained. And under drought stress, silicon increased the biomass and water content of leaves in cucumber plants. Silicon decreased the decomposition of chlorophyll in cucumber plants under drought stress, limited the increase of the plasma membrane permeability and malondialdehyde (MDA) content in leaves, alleviated the physiological response of peroxidase (POD) to drought stress, maintained the superoxide dismutase (SOD) normal adaptation, and increased the activity of catalase (CAT). Under severe stress, these physiological biochemical reactions showed positive correlations with the amount of silicon supply. These findings demonstrated that silicon enhanced the resistance of the cucumber plants to drought. Statistical analysis indicated that under drought stress the cumulative value of biomass showed a highly significant correlation with the cumulative value of diurnal photosynthesis (r = 0.9812, p < 0.01), and was significantly correlated with the water content of leaves (r = 0.8650, p < 0.05). These results demonstrated that under drought stress the first factor responsible for the effects of silicon application on the cumulative value of biomass was the increase of photosynthesis, and the second factor was the enhancement of the water holding capacity. Based on these facts, it was concluded that silicon enhanced the resistance to drought mainly by taking part in the metabolism of plants.  相似文献   

林业机械设备控制芯片设计的模型检验方法     

范德会  马光胜 《东北林业大学学报》2013,41(2):93-98,122

为解决林业机械设备控制芯片设计中模型检验问题,提出基于多项式理论的定界模型检验方法.首先,给出基于多项式形式的电路功能的统一描述.为了能够采用多项式形式描述电路功能,在传统的电路控制逻辑描述方法的基础上,将其进一步扩展,将传统方法中的原子命题转化为多项式形式,将布尔特征函数转化为多项式集合的形式.这样,可以与电路数据通路部分建立统一的多项式描述形式.其次,通过建立高级语言的关系模型,给出了电路在高层次描述中目标性质的抽取方法,通过该方法形成待验证性质的多项式形式描述,从而形成了待验证性质与电路功能统一的多项式形式.基于以上两点,将定界模型检验问题转化为基于多项式理论的定理证明问题.并采用计算多项式集合良好三角列的方法解决定理证明问题.与传统方法相比,该方法可在电路高级别抽象上直接进行定界模型检验.  相似文献   

贵州小型猪胃肠黏膜淋巴组织分布规律研究     

刘霞  郑邦英  郭俊峰  钱宁  吴曙光  王明镇  王平  田维毅 《黑龙江畜牧兽医》2013,(5):1-2,7,165

为了观察贵州小型猪(Sus Scrofa domestica var.mino Guizhounensis Yu.)胃肠黏膜淋巴组织的分布特点,研究随机抽取封闭群健康成年贵州小型猪,采集胃肠道组织,常规H.E.染色,观察和分析其淋巴组织的分布规律。结果表明:成年贵州小型猪胃黏膜淋巴细胞主要分布于固有层;小肠黏膜的淋巴细胞较胃黏膜极显著增加(P<0.01),且从十二指肠到回肠呈上升趋势;回肠固有层及黏膜下层可见集合淋巴小结;大肠黏膜淋巴细胞由上至下呈减少趋势(P<0.01)。胃肠黏膜各段均可见上皮内淋巴细胞,其中以小肠最多,且从十二指肠到回肠呈下降趋势,大肠次之,胃黏膜最少。说明成年贵州小型猪胃肠黏膜淋巴组织分布规律与人及大鼠、小鼠等哺乳动物相似,以小肠最丰富,大肠其次,胃黏膜最少;小肠三段黏膜淋巴组织呈上升趋势,回肠最丰富,而大肠黏膜淋巴组织则呈下降趋势。  相似文献   

Does Dietary Administration of Lactococcus lactis Modulate the Gut Microbiota of Grouper,Epinephelus coioides     

Yun‐Zhang Sun  Hong‐Ling Yang  Ru‐Long Ma  Shao‐Wei Zhai 《Journal of the World Aquaculture Society》2012,43(2):198-207

The effect of dietary administration of probiotic Lactococcus lactis MM1 for 60 d on the autochthonous microbiota in the foregut, midgut and hindgut of juvenile grouper, Epinephelus coioides, was evaluated using polymerase chain reaction‐denaturing gradient gel electrophoresis (DGGE). Samples collected from the probiotic and control groups showed different DGGE patterns, while 11 common bands presented in both groups. The similarity dendrogram revealed three different clusters depending on the three sections of the gastrointestinal (GI) tract, and the probiotic triplicates in each GI section were generally clustered into one group distinctly different from the corresponding control triplicates. Increased species richness and Shannon index were observed in the foregut, midgut, and hindgut samples in the probiotic group compared with the control group, which suggested that probiotic L. lactis MM1 could improve the autochthonous microbial diversity along the GI tract of E. coioides. The growth of many potentially beneficial and unidentified bacteria was stimulated by the probiotic, whereas the growth of some potential harmful species, like Staphylococcus saprophyticus, was depressed.  相似文献   

黑龙江省和谐自然保护区理论体系的构建     

郭玉荣  宫茜茜  马建章  邹红菲  布和巴特尔 《野生动物》2013,34(5)

随着黑龙江省自然保护区数量及占地面积的迅速增长,自然保护区质量提升滞后以及建设与管理过程中诸多矛盾冲突的不和谐现状也随之显现,解决这些问题的关键在于推进自然保护区和谐发展.自然保护区的和谐是和谐社会内容的一部分,有关这方面的研究有利于促进我国社会主义和谐社会目标的最终实现.但目前我国关于构建和谐自然保护区的相关研究还处于初级阶段.本文在研究国内外自然保护区建设和管理相关理论的基础上,从法律保障体系建设、社区共管体系建设、生态补偿机制建设和区域发展援助基金成立,以及生态旅游开展等方面,提出了黑龙江省构建和谐自然保护区管理建议,为黑龙江省的生态文明和和谐社会建设提供了参考.  相似文献   

园林景观设计在小区规划建设中的作用     

马国龙 《北京农业》2012,(9):49-50

一个受欢迎的园林景观设计,必定能全方位体现整个小区生活的文化品位和生活品质,并且彰显出园林景观设计的人性化,生活化,情趣性以及地域性。笔者从园林景观设计的意义出发,从景观设计在小区规划建设中所起的功能作用为主要内容,阐述现代园林景观设计的重要性。  相似文献   

宿迁市杨树病虫害发生原因及防治对策     

邓友梅  马永强  高娟 《林业科技情报》2008,40(1):2-3

简要介绍了江苏省宿迁市杨树病虫害种类与发病原因,并提出了相应的防治对策,如推进杨树综合性营造林措施为根本,加强森林病虫害防治体系建设等。  相似文献   

椰子果肉中蛋白质亚基的组成与含量分析     

郑亚军  赵松林  陈华  马子龙  覃伟权 《热带作物学报》2008,29(6):704-709

采用非变性聚丙稀酰胺凝胶电泳（Native-PAGE）和十二烷基硫酸钠-聚丙稀酰胺凝胶电泳（SDS-PAGE）分离分析椰子果肉中蛋白质主要亚基的组成、分子量和含量。结果表明，用pH7．8的磷酸盐缓冲溶液提取，椰子果肉中蛋白质在浓缩胶浓度为7．5％、分离胶浓度为11．5％的SDS-PAGE凝胶系统中可以得到很好的分离。在海南本地高种椰子的椰子果肉蛋白中含有11条亚基，分子量范围为13．6～64．5kDa，主要是中、小分子量亚基。非变性凝胶电泳分析表明，高种椰子蛋白中含有5个不同分子量、不同电荷的组分。  相似文献   

风景名胜区“景中村”景观整治探讨——以杭州市西湖风景名胜区内村庄为例     

韩宁  马军山  卫立群 《农业科技与信息》2011,(3)

随着近年来国家大力进行新农村建设,农村发展得到了前所未有的重视。而景中村作为处于风景名胜区中比较特殊的村落,它不仅具有一般农村的特点,更重要的是它还直接影响着风景名胜区的整体发展,因此显得十分重要。本文将以杭州西湖风景名胜区中的三个具有代表性的景中村为例,对景中村景观整治模式进行探讨。  相似文献   

关于汽轮机低真空供热的讨论     

潘瑞岩  马振军 《林业科技情报》2008,40(1):55-56

汽轮机降低真空运行,提高循环水温做为冬季供暖是一项社会效益和经济效益都十分显著的节能技术,下面把利用汽轮机低真空运行循环冷却水采暖技术及其显著的经济效益简述如下。  相似文献