气吸式排种器批量联动试验台的设计     

李晓明  齐忠军  王涛  李国民 《农业科技与装备》2014,(3):26-28

设计一种新型批量联动排种器试验台,以有效解决播种机排种器总成的质量检验及性能调试问题。介绍该试验台的总体结构及工作原理,详细说明各主要系统的配置及其参数计算方法。该试验台结构合理,操作方便,工作效率高。  相似文献   

生物质成型燃料技术特点及经济效益分析     

冉毅  李谦  彭德全  王超  汤晓玉  罗惜民 《安徽农业科学》2015,(27):322-325

在分析生物质成型燃料技术特点和项目社会关系的基础上,选取湖北省1家生物质成型燃料企业为研究对象,对其经济效益进行分析.结果显示,该企业净现值为正值,项目可行;内部收益率14.0％,项目收益较高;动态投资回收期10.7年,项目风险较大.对影响经济效益的不确定性因素分析:成型燃料售价对经济效益影响极其敏感,敏感系数为10.6,其次是原料收购价格,敏感系数为6.4,政府对项目建设补贴较敏感,税收政策影响不敏感,敏感系数分别为1.8和0.55.根据新出台的税优惠政策,内部收益率可提高至21.7％,如政府对成型燃料售价补贴10％,加上税收优惠,内部收益率将达到36.8％,动态授资回收期下降到4.3年,经济效益显著,项目风险低.  相似文献   

正确处理农机安全监督管理的八大关系     

毕红  谢明鑫 《中国农机化》2008,(2):92-94

农机安全监督管理工作是一项重要的农业行政执法工作,在整个农机化管理工作起着核心的龙头作用。正确处理好上下内外等各方面的关系,对搞好农机安全监督管理工作是非常必要的。  相似文献   

装载机八连杆机构工作装置优化设计     

王少雷  刘长生 《林业机械与木工设备》2006,34(10):28-30

八连杆机构是装载机工作装置的重要部分。本文以铲掘位置时的八连杆机构传力特性为目标函数,建立了八连杆机构工作装置的数学模型。采用惩罚函数法,结合样机对其进行优化设计。结果表明,优化设计后工作装置的性能得到进一步完善和提高。  相似文献   

Plant–Water Relations of Kidney Bean Plants Treated with NaCl and Foliarly Applied Glycinebetaine     

C. M. L. Lopez  H. Takahashi  & S. Yamazaki 《Journal of Agronomy and Crop Science》2002,188(2):73-80

Salinity is at present one of the most serious environmental problems influencing crop growth. It has been extensively demonstrated that salinity affects several physiological processes in the plant, including the plant–water relations of most salt-sensitive crops species. In this study, the effects of salinity on the plant–water relations of kidney bean ( Phaseolus vulgaris L.) and the possibility that foliarly applied glycinebetaine improves these water relations are examined. Kidney bean plants were grown in a greenhouse and treated with 0, 30, 50 and 100 m M NaCl, combined with 0, 10 and 30 m M glycinebetaine in foliar applications. Increased salinity levels decreased stomatal conductance, photosynthetic rate, transpiration and leaf relative water content in the 30, 50 and 100 m M treatments relative to the control treatment. Glycinebetaine applications of 10 m M increased stomatal conductance at 50 m M NaCl, ameliorating significantly the effect of salinity on water relations through increases in the leaf relative water content. At 100 m M NaCl, 30 m M glycinebetaine applications in particular contributed to osmotic stress, and had an adverse effect on plants. Our experiment suggests that glycinebetaine can be used as an alternative treatment to reduce the effects of salt stress on the water relations of salt-sensitive plants, but only to limited salinity levels. Furthermore, the improvement in the water status of kidney beans was dose dependent, suggesting that the concentration of glycinebetaine essential for the survival of salt-sensitive plants is species specific and must be determined individually for each plant species.  相似文献   

Detecting and estimating segregation distortion and linkage between glufosinate tolerance and blackleg resistance in Brassica napus L.     

Rong-Cai Yang  Mohan R. Thiagarajah  Vipan K. Bansal  Gary R. Stringam  M. Habibur Rahman 《Euphytica》2006,148(3):217-225

Summary The segregation and linkage between glufosinate (transgenes ‘Rf3’ and ‘T177’) and blackleg resistance genes in canola (Brassica napus L.) were assessed using F₁ microspore-derived doubled haploid (DH) populations from four crosses including reciprocals, two involving the transgene ‘Rf3’ and the other two involving the transgene ‘T177’. To relax the assumption of no segregation distortion required for the conventional analysis of segregation and linkage, we employed Bailey's analysis that allows detecting segregation distortion at linked loci. The significant departures from the 1:1 segregation were detected in the crosses involving the transgene ‘T177’ but not in the crosses involving the transgene ‘Rf3’. The apparent deficit of the herbicide tolerant DH lines in the crosses with the transgene ‘T177’ is likely due to differential selection against the gametes carrying ‘T177’ during microspore culture. The linkage was strong between blackleg resistance and the transgene ‘Rf3’ but weak or absent between blackleg resistance and the transgene ‘T177’, suggesting that the two transgenes are probably inserted into distant regions of the genome. The observed linkage offers an opportunity to develop new canola cultivars with both glufosinate tolerance conferred by transgene ‘Rf3’ and blackleg resistance.  相似文献   

Molecular mapping of an aluminum tolerance locus on chromosome 4D of Chinese Spring wheat   总被引：13，自引：0，他引：13  

Ming-Cheng Luo  Jan Dvořák 《Euphytica》1996,91(1):31-35

Summary The tolerance of aluminum (Al) of disomic substitution lines having the chromosomes of the D genome of Triticum aestivum L. cv. Chinese Spring individually substituted for their homoeologues in T. turgidum L. cv. Langdon was investigated by the hematoxylin method. The disomic substitution lines involving chromosome 4D were more Al tolerant than Langdon. The tolerance was found to be controlled by a single dominant gene, designated Alt2, that is in the proximal region of the long arm of chromosome 4D. The locus was mapped relative to molecular markers utilizing a population of recombinant chromosomes from homoeologous recombination between Chinese Spring chromosome 4D and T. turgidum chromosome 4B. Comparison of the location of Alt2 in this map with a consensus map of chromosomes 4B and 4D based on homologous recombination indicated that Alt2 is in a vicinity of a 4 cM interval delineated by markers Xpsr914 and Xpsr1051. The Alt2 locus is distal to marker Xpsr39 and proximal to XksuC2. The Altw locus is also proximal to the Knal locus on chromosome 4D that controls K⁺/Na⁺ selectivity and salt tolerance. In two lines, Alt 2 and Knal were transferred on a single 4D segment into the long arm of T. turgidum chromosome 4B.  相似文献   

Genetics of Five Seed Esterase Isozymes in Pearl Millet     

M. V. Subba  Rao  Y. Saideswara  Rao V. Manga 《Plant Breeding》1989,102(2):133-139

Inheritance and linkage relationships of pearl millet seed esterase isozymes were studied using; polyacrylamide dise: gel electrophoresis and α-naphthyl acetate as substrate. The Zone of enzyme activity was resolved into five bands. The presence of a band showed complete dominance over its absence. Each one of the bands (1 to 4) was under the control of a single gene. Band five was found to be controlled by three independent loci with duplicate gent action Loci for Est₁, Est₃ and Est₄ Were found to be linked. Est₂ Was independent of this linkage group.  相似文献   

Co-heritability: Its relation to correlated response,linkage, and pleiotropy in cases of polygenic inheritance     

M. J. J. Janssens 《Euphytica》1979,28(3):601-608

Summary The concept of co-heritability is proposed in order to describe the genetic associations within pairs of quantitative traits. The mathematical relations between co-heritability, correlated response, and the coefficient of genetic prediction are shown. From observations in a diallel experiment with 10 year-old slash pine it appeared that the genetic association of a character pair is a phenomenon of low genetic variability and high inheritance. Exploratory indicators are proposed to estimate the nature of the genetic association.  相似文献   

A Possible Association Between Heading Time and the GM-A2 Locus in Bread Wheat     

D. Laflandra    B. Margiotta  E. Porceddu 《Plant Breeding》1987,99(4):333-335

A line without expression (null form) o: the α-gliadins controlled by the 6A chromosome was found when screening electrosboretically single seeds of the bread wheat ‘Raeder’. Differences in heading time were also observed between this null line and the normal one. A linkage between 6A gliadin genes and heading time gene(s) is hypothesized.  相似文献