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不同扦插密度对商薯19产量及经济效益影响分析 总被引：1，自引：0，他引：1
为了丰富商洛市甘薯品种类型,大面积推广商薯19,筛选出商薯19在商洛市川道地区的最佳扦插密度,试验从5个密度水平,7个经济指标进行系统研究,通过对商薯19经济性状、品质性状、667 m~2产量和经济效益调查结果分析,发现品种在4 500株/667 m~2密度下产量最高、经济效益最好。 相似文献
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LUO Yuan-hua LENG Qing-yun MO Rao CHEN Ye-yuan .College of Agronomy South China University of Tropical Agriculture Danzhou .Tropical Crop Genetic Resource Research Institute Chinese Academy of Tropical Agriculture Science Danzhou 《（《农业科学与技术》）编辑部》2008,(1)
[Objective] The aim of the research was to establish asymbiotic germination and low-temperature in vitro conservation technique system of Cymbidium dayanum by using plant tissue culture technique to realize its rapid propagation and long-term conservation in vitro.[Method] With mature seeds of C.dayanum as explants,different media were selected to establish asymbiotic germination technique system.With protocorms as materials,conservation,resumptive proliferation and plant regeneration conditions were selected to establish low-temperature in vitro conservation technique system preliminarily.[Result] Mature seeds of C.dayanum could germinate after cultured 90 days on MS media as well as "Hyponex 1" media.The germination rate reached more than 98%.Protocorms inoculated in "Hyponex 1" media could be conserved continuously at 5 ℃ in dark for more than 18 months and the survival rate could reach 90%.Conserved protocorms could realize resumptive proliferation culture both on 1/2 MS and "Hyponex 1" media.The seedling-strengthening and rooting media were 1/2 MS media.[Conclusion] This research provided practical basis for in vitro conservation and rapid propagation of C.dayanum germplasm resource. 相似文献
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TAO Jing AI Yi-wen LUO You-qing YANG Liu YAN Wei CHEN MinKey Laboratory for Silviculture Conservation of Ministry of Education Beijing Forestry University Beijing P.R.China College of Environment Plant Protection Hainan University Danzhou P.R.China 《中国林学(英文版)》2009,(1)
Hyphantria cunea(Drury) is a severe invasive pest in Beijing.It is important to understand the reason for its successful invasion and outbreak.Accordingly,this study was tailored to assess molecular variation and genetic relationships among three H.cunea populations in Beijing and one population from Sanhe in Hebei Province as control(totally 100 individuals).A silver-labeled amplified fragment length polymorphisms(AFLP) DNA profiling method was used to detect the genetic diversity and relationship among th... 相似文献
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海马齿是海边盐生肉质草本植物,由于叶片的肉质化,传统石蜡切片制作路线不能制作出结构完整,效果较好的切片。本实验以传统的石蜡切片方法为基础,在固定方法选择,脱水时间控制,包埋温度,染色等方面做了适合海马齿叶片特点的改良,固定方法采用戊二醛固定液固定24h,并洗脱;脱水每级梯度时间为1h,包埋温度在100℃,染色方法采用固绿染色法。结果表明：采用这种改良的方法可以制作出染色清晰,组织结构完整的海马齿叶片切片。这对其它肉质化植物的石蜡切片制作有着借鉴作用。 相似文献
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用快速原型法和生命周期法相结合的方法，设计和建立了《海南省农业资源信息管理系统》，这是海南省第一个综合性的大型农业数据库。它录入了１９５２一１９９３年间海南省Ｎ个县（市）、９２个农场的自然环境、土地资源、气候资源、人力资源、水力资源、生物资源以及农业生产、农产品加工、农业产值、农业现代化、农业科技、农业灾害及其治理等方面的大量数据，共３００多个库，１３００多项指标，近６００万有效数据。对本系统采取如下措施：严格审理指标体系，减少冗余；用下拉式菜单代替一般的树型结构菜单；巧妙使用宏替换实现数组的功能，大大简化了程序；用ＦＯＸＰＣＯＭＰ，ＥＸＥ编译了所有的ＰＲＧ文件和。ＦＭＴ文件，以及编制过程文件，大大提高运行速度；用２１３１或２ｌ３Ｋ支持本系统，使之既能充分发挥２１３Ｌ方便灵活的打印功能和强有力的绘图功能的优点，又能克服２１３Ｈ的菜单底色有黑色条纹的缺点，并可解决大字封面设计的存储及调用问题；还对本系统实行三级加密，自动查病毒；使本系统逐步优化，成为一个速度快、准确、用户界面友好、安全可靠、有生命力的系统 相似文献
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Genetic Analysis of a Biomass Mutant in Oryza sativa 总被引：2，自引：0，他引：2
LIAO Zi-rong HUANG Dong-yi NIU Jie LI Qiao WU An-di College of Agriculture Hainan Univesity Danzhou 《（《农业科学与技术》）编辑部》2008,(2)
[Objective] The study aimed to reveal the genetic model of a biomass mutant in Oryza sativa. [Method] In the process of screening and identification of Bar-transgenic rice,a biomass mutant was found in 10 lines of T1 progenies. The mutant was investigated for genetic analysis and agronomic traits by herbicide spraying and PCR amplification. [Result] The segregation ratio is consistent with mendelian law(3∶1). The mutant assumed not only higher plant height,wider straw and earlier florescence,but also more tillers,bigger spikes and resultantly higher biomass. PCR detections indicated that no co-segregation was observed between mutant traits and target gene(Bar) in the T-DNA inserted,proving that the mutant is not caused by the insertion of T-DNA containing target gene (Bar). [Conclusion] Our study may avail to understand the cloning of mutant gene and the mechanism of the mutant gene on biomass. 相似文献
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十二种柱花草种子萌发期耐盐性的测定 总被引：1，自引：1，他引：1
以热带地区常见的12种柱花草种子为试验材料，观测了它们在不同盐浓度处理下的萌发率。结果表明，低盐浓度对部分柱花草种子萌发有促进作用；随着盐处理浓度增高，发芽率一般呈下降趋势，但也有例外；不同浓度的盐胁迫下柱花草种子的适应情况不同，同一柱花草种子在萌发时对不同盐的适应情况也不同。 相似文献
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2种激发子对西瓜枯萎病的诱抗作用 总被引：6，自引：0，他引：6
分别测定了来源于西瓜枯萎病菌和香蕉枯萎病菌的细胞壁来源的水溶性、热稳定激发予对西瓜枯萎病的诱抗作用。结果表明：2种来源的激发子均有明显的诱导西瓜苗细胞壁木质化的作用，但来源于香蕉枯萎病菌的激发子对木质化的诱导活性比来源于西瓜枯萎病菌的要高；西瓜苗分别经2种激发子处理后，体内过氧化物酶、多酚氧化酶和苯丙氨酸解氮酶的活性均有异常的增加，但来源于西瓜枯萎病菌的激发子对这3种防御酶的诱导速度比来源于香蕉枯萎病菌的要快；经激发子诱导处理后瓜苗对枯萎病菌的抗性有了明显的提高，但来源于西瓜枯萎病菌的激发予的诱抗效果相对较好。 相似文献
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几种药剂对褐足角胸叶甲的毒力测定 总被引：1，自引：0，他引：1
应用浸叶饲喂法测定6种药剂对褐足角胸叶甲（Basilepta fulvipes Motschulsky）成虫的毒力作用。结果表明：6种杀虫剂均对褐足角胸叶甲均有效果,其中25％联苯菊酯．啶虫脒．哒螨灵乳油、25％氯虫苯甲酰胺．啶虫脒．哒螨灵乳油、25％除尽·啶虫脒·哒螨灵乳油和25％多杀菌素．啶虫脒．哒螨灵乳油对褐足角胸叶甲成虫的毒力较高,LC50分别为23．5198、7．4323、23．6026和15．9777mg／L。45％马拉硫磷乳油和20％甲氰菊酯乳油的毒力较低。 相似文献