共查询到20条相似文献,搜索用时 78 毫秒
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河池市植保工作可持续发展面临的问题及对策研究 总被引:1,自引:0,他引:1
针对河池市基层植保工作中存在的主要问题,从可持续发展的角度,探讨河池市实施可持续发展植保战略的途径。提出建设可持续发展的河池市植保工程的主要途径:倡导"公共植保,绿色植保"新理念;加强病虫害测报体系的建设;加强植保技术培训工作等。 相似文献
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本文系统论述了我省粮食作物上的主要生物灾害发生现状,80年代以后为害加重。分析了病虫种群变动与猖獗的主要原因有:耕作制度和种植业结构的变动、品种因素、栽培条件的影响以及植保体系不健全等。并有针对性地提出了加强植保工作的若干建议:健全植保体系,加强植保研究,调整作物和品种布局,合理施肥、改善土壤营养,逐步发展集中、统一、规模经营,统筹实施植保措施,促进我省粮食生产。 相似文献
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植保工作面临的形势与对策 总被引:3,自引:0,他引:3
针对植保工作面临的新形势,提出了加强基础设施建设和建立植保预警机制,稳定队伍和提高素质,转变职能和构建社会化服务体系,推广绿色植保和实施可持续发展战略,完善法规和加强执法与管理等发展对策。 相似文献
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Nelson B 《Science (New York, N.Y.)》1967,157(3794):1282-1286
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王山 《国家林业局管理干部学院学报》2011,(4):21-23
培训管理是教育教学管理的一个组成部分。面对教育形势的巨大变化,黑龙江林业职业技术学院紧紧围绕内涵建设这一中心任务,树立新的管理理念,改革管理机制,创新管理方式,与学院的发展步调一致,步入内涵式发展、科学发展的轨道。 相似文献
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Raf, a trans-acting locus, regulates the alpha-fetoprotein gene in a cell-autonomous manner 总被引:4,自引:0,他引:4
Genetic analysis provides an approach for identifying regulatory loci that govern the expression of specific genes within the context of the entire organism. Such analyses have defined two unlinked regulatory loci, termed raf and Rif, that modulate the levels of alpha-fetoprotein in liver. Of primary importance for the isolation and characterization of the raf product is to determine whether it is produced by the hepatocyte or whether it is produced by a different cell type. By means of analysis of alpha-fetoprotein expression in livers of embryo aggregation chimeras derived from mice of different raf genotypes it was possible to conclude that the product of the raf locus is expressed as a hepatocyte autonomous function that acts in trans to regulate the level of alpha-fetoprotein messenger RNA. 相似文献
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Schäfer W Straney D Ciuffetti L VAN Etten HD Yoder OC 《Science (New York, N.Y.)》1989,246(4927):247-249
Certain genes of Nectria haematococca, a fingal pathogen of pea (Pisum sativum), encode pisatin demethylase (pda), a cytochrome P-450 monoxygenase that detoxifies the phytoalexin pisatin. Because pda is required by N.haematococca for pathogenicity on pea, pisatin helps defend pea against N. haematococca. The possibility that pisatin is a general defense factormicrothat is, that pda can confer pathogenicity to fungi not normally pathogenic on peamicrowas investigated. Genes encoding pda were transformed into and highly expressed in Cochliobolus heterostrophus, a fungal pathogen of maize but not of pea, and in Aspergillus nidulans, a saprophytic fungus, neither of which produces a significant amount of pda. Transformants contained at least as much pda as did wild-type N. haematococca. Recombinant C. heterostrophus was normally virulent on maize, but it also caused symptoms on pea, whereas recombinant A. nidulans did not affect pea. Thus, phytoalexins can function in nonspecific resistance of plants to microbes; saprophytes appear to lack genes for basic pathogenicity. 相似文献
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Genes, genetics, and epigenetics: a correspondence 总被引:2,自引:0,他引:2
Over the past months, as this special issue took shape, the Editors of Science have monitored an exchange of seven letters initiated by three queries from M. Bacon. These queries concern the popular definitions of "genes," "genetics," and "epigenetics." Below, we reprint excerpts from these letters, referring interested readers to www.sciencemag.org/cgi/content/full/293/5532/1103/DC1 for the complete text and additional references. 相似文献
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