作物发育模型生理参数的QTL定位与应用研究初报--以大麦品系的生育期预测为例   总被引：4，自引：2，他引：2  

殷新佑  唐建军  刘桃菊  李晖  张佩莲  戚昌瀚 《江西农业大学学报》2003,25(6):839-843

研究试验应用作物模型与QTL定位的互补作用，对作物发育模型的生理参数作QTL定位分析，使作物发育的预测直接建立在单个遗传基因QTL的基础之上。以大麦两个亲本及其94个自交纯系(RIL)的感光性试验为依据，确定了播种一出穗期间对应的发育模型的4个参数值，再对这些参数值的QTL在遗传图上的位置及其加性效应进行了估算。并以基于QTL效应的模型对RIL群体在不同环境条件(两年播期试验)下的发育期进行预测。  相似文献   

宁德市国有生态公益型林场分类经营与可持续发展对策   总被引：2，自引：2，他引：0  

阮学瑞 《福建林业科技》2002,29(Z1):47-51

在分析宁德市国有生态公益型林场分类经营的现状、存在问题的基础上,就其分类经营、可持续发展提出了5点对策和5条管理措施。  相似文献   

河北省核桃栽培现状和发展对策   总被引：5，自引：0，他引：5  

毛向红  王福宗 《河北林果研究》1997,12(4):385-389

由于河北省的核桃生产目前还大多沿用帝生繁殖和传统的粗放经营方式，所以产量低、品质差。现有大树中大致有丰产、潜在丰产和低产３种类型、要发展河北省的核桃生产，诮该做好以下几方面的工作，首先是充分利用现有资源，提高核桃的产量和质量；二是加大发展优良品种的力度，建立良种核桃生产基地；三是注重发展本省的核桃优良品种。  相似文献   

闽北速生丰产林基地建设的现状、问题与对策   总被引：1，自引：0，他引：1  

张水生 《福建林业科技》2002,29(Z1):76-78

闽北速生丰产林基地建设存在结构不合理、经营主体缺位、资金不足、科技含量低、林分质量不高等问题,文中对基地现状作了一些分析,并就基地建设提出具体对策措施。  相似文献   

我国中小型冰淇淋企业现状及发展   总被引：1，自引：0，他引：1  

严佩峰  刘学彦 《信阳农业高等专科学校学报》2002,12(3):22-23

通过对我国中小型冰淇淋企业的特点和生产现状的分析 ,指出了其存在的问题和发展方向。  相似文献   

Challenging the developmental state: Nature conservation in Singapore     

Harvey Neo 《Asia Pacific viewpoint》2007,48(2):186-199

Abstract: Nature conservation efforts are often reactive to encroaching development plans and systematic conservation planning that is integral with development is not only uncommon, but is often fraught with difficulties even where it is actually attempted. Such obstacles to conservation are especially apparent in developmental states where state legitimacy is largely derived from the state's ability to develop the country. Among other things, developmental states place a premium on physical and economic development. This paper critiques, through the standpoint of nature conservation, the inadequate conceptualisation of ‘development’ in the developmental state thesis. Specifically, this paper argues that the seemingly value‐free (but ultimately economically based) underpinnings of development goals pushed by the developmental state needs to be tempered with a broader concern for the ethics of development. To that end, I draw on two case studies of nature conservation tussles in Singapore to show how alternative extra‐economic visions of development have been articulated, notwithstanding the developmental state's monopoly on the discourse (and practice) of progress and development. The case studies, set in the heady economic growth of the early 1990s, will critique two related aspects of the developmental state: its ‘amoral’ economistic conception of development and its use of growth and materialism as legitimacy.  相似文献   

Genetic analysis of methionine content in indica-japonica hybrid rice (Oryza sativa L.) at different grain developmental stages     

Zhang  Xiao-ming  Shi  Chun-hai  Yue  Shen-Hai  Wu  Jian-guo  Bao  Geng-liang 《Euphytica》2004,139(3):249-256

Genetics of methionine content in indica-japonica hybrid rice (Oryza sativa L.) was studied in 35 F₁ hybrids derived from crossing 7 male-sterile indica rice cultivars with 5 restorer japonica rice cultivars. Two genetic models and their corresponding statistical methods for quantitative traits of triploid endosperm in cereal crops were used for the analysis. One is the unconditional model, which refers to the analysis of cumulative measurements along the developmental stages, while another is the conditional model, which relates to analysis throughout the developmental stages. Results showed that methionine content of indica-japonica hybrid rice was controlled by expression of triploid endosperm nuclear genes, cytoplasm genes, diploid maternal plant nuclear genes, and their genotype-environment interaction effects. Dominant effects were important at the first three developmental stages, while additive effects were important at the next two stages of grain development under both unconditional and conditional analyses. With regard to the components of heritability, maternal and cytoplasm general heritabilities and their environmental interaction heritabilities were important. It was suggested that enhancing methionine content could be more efficient when selection is based on maternal plants in early breeding generations.  相似文献   

温室长季节栽培番茄发育动态模拟模型的研究     

徐刚  张昌伟  李德翠  孙艳军 《农业工程学报》2005,21(Z2):243-246

根据番茄生物学特性、发育阶段有效积温恒定的原理和多年的栽培经验,对温室长季节栽培番茄的发育阶段进行划分,其生长发育阶段包括播种期、幼苗期、开花座果期、果实膨大期、果实采收初期、果实采收盛期和果实采收末期.将不同播期各生育阶段的生长度日的平均值确定为建模过程中的参数Ai自幼苗期至果实采收末期分别为710.5、110.5、152.3、302.9、245.6、2156.7、200.5度日.确定了发育阶段有效积温参数后,建立了温室番茄长季节栽培的发育动态模拟模型,系统的预测番茄发育阶段.模型检验结果表明,温室番茄发育动态模拟模型具有较高的精确性、机理性和实用性.  相似文献   

中国农业装备产业发展战略研究   总被引：5，自引：3，他引：5  

方宪法  陈志  苏文凤  杨炳南 《农业工程学报》2007,23(2):267-272

该文深入分析了中国农业装备产业发展现状与态势、发展中存在的问题与制约因素，提出振兴中国农业装备产业要实施自主创新战略、现代制造技术改造提升战略、组织结构优化战略、品牌培育战略以及市场拓展战略5大具体战略，以实现2010年农业装备制造业工业总产值翻一番，装备技术自主创新能力显著增强；2020年农业装备工业总值将在2010年基础上再提高50％，步入世界农业装备制造强国行列的阶段战略目标。探讨了中国农业装备科技创新体系建设的重点在于强化国家农业装备工程技术研究中心建设、打造大型农业装备制造企业、推进中小企业间合作创新，以增强共性技术研发能力、逐步培育农业装备产业创新主体和构建农业装备技术集成与推广服务平台。最后提出了完善农业装备科技创新机制的政策建议，重点在于建立新型农业装备科技创新运行机制，整合创新资源引导建立产学研合作创新的长效激励机制，建立多元化农业装备创新资金投入机制。  相似文献   

文冠果的栽培利用及其发展前景     

孙志刚  张建成 《河北林果研究》2011,(4):389-391,395

文冠果属无患子科文冠果属植物,为近年来我国发展迅速的优良木本油料树种之一。本文对文冠果的栽培历史、生物学特性、营养价值、栽培技术及开发利用前景进行了综述。  相似文献