共查询到20条相似文献,搜索用时 31 毫秒
1.
利用8个亲本的双列杂交材料,按Hayman分析法研究了小麦籽粒灌浆特性的遗传规律。结果表明,小麦籽粒灌浆特性符合加性-显性遗传模型。基因作用以加性效应为主,部分显性。籽粒灌浆期性状的显性方向指向增效,籽粒灌浆速率的显性方向指出减效。所有性状均有较高的狭义遗传力,hN^2=0.71 ̄0.93,可在杂种早代选择。灌浆期与灌浆速率二类性状群分别有一致的遗传行为,在遗传方式上与一个单位性状的表现相似。 相似文献
2.
Information Value Model is used frequently in domestic landslide hazard zonation prediction, which plays a very important role for land-use planning especially in mountain area. Through theoretical analysis, the prerequisite of Information Value Model which should be used with influence-factors independent from each other is studied. Factor Analysis is adopted to evaluate and eliminate the influence of correlation between influence-factors in spatial prediction of landslides which are showed through case study. Relationships between landslides and influence-factors are studied based on a certain watershed in which the Information Value Model and Factor Analysis are applied. The probability of landslides changes regularly with the influence-factors, and based on which a method for the discretization of influence-factors is advised. The distribution of landslide susceptibility of above watershed is calculated and validated based on the area-ratio index with landslides occurring in nearly 5 years, which proves the credibility of Information Value Model. 相似文献
3.
This paper discusses 18 factors which control the cost of project according to the constitution of the cost of project.The cost of project is estimated by fuzzy mathematics' method which adopts the principle of fuzzy proximity degree, principle of shortcut and the principle of expert system and which quantifies similarity of some projects finished and one planned. 相似文献
4.
5.
6.
李逢振 《农产品加工.学刊》2020,(4):65-67
蛋壳主要由石灰质真壳和壳下膜2个部分组成,石灰质真壳中含有大量碳酸钙,是一种天然绿色的钙源;壳下膜中含有N-乙酰氨基葡萄糖半乳糖硫酸软骨素、氨基酸等多种可溶性高分子化合物。如何能采取方法对壳膜进行有效分离,使其物尽其用,可以充分挖掘蛋壳中潜在的利用价值,还可以从源头上减少垃圾排放量,有利于保护赖以生存的生态环境。通过介绍目前国内外3种壳膜分离的方法,阐述了每种方法的优缺点,为有效利用蛋壳壳膜资源提供了科学依据。 相似文献
7.
为明确滚筒干燥工序加工强度对烤烟烟叶感官质量作用特点,得到滚筒干燥工序加工烤烟烟叶的适宜条件,以国内外主要烟叶产区的烤烟烟叶为试验材料,在滚筒干燥设备性能范围内通过参数组合的方法设置不同的加工强度,采用对比评吸法比较不同加工强度条件下的烤烟烟叶感官质量变化。结果表明,随着滚筒干燥工序加工强度的增大,烤烟烟叶香气风格变化的样品比例逐渐升高;香气质、香气量、杂气、浓度、细腻程度、刺激性、干净程度改善的烟叶样品比例先升高后降低,其中香气质、香气量、杂气、细腻程度、刺激性、干净程度改善的烟叶样品比例在加工强度2(筒壁温度130℃、热风温度90℃、排潮风门开度80%)最高,分别为54%、29%、69%、65%、30%、35%;浓度改善的烟叶样品比例在加工强度3(筒壁温度150℃、热风温度100℃、排潮风门开度60%)最高,达到19%;干燥感改善的烟叶样品比例逐渐降低,最高达到15%;劲头改善的烟叶样品比例均小于3%;香气特性、烟气特性和口感特性各指标变差的烟叶样品比例逐渐升高。在加工强度1~2(筒壁温度115~130℃、热风温度80~90℃、排潮风门开度80%~100%),感官质量保持不变与改善的烟叶样品比例显著大于感官质量变差的烟叶样品比例,滚筒干燥工序在加工强度1~2设置有利于保持和改善烤烟烟叶感官质量。 相似文献
8.
9.
水稻籼粳亚种间杂种不育性的研究进展 总被引:1,自引:0,他引:1
克服杂种不育性是利用籼粳亚种间杂种优势的关键。由此对水稻亚种间杂种不育性的原因、细胞学基础及两种主要基因遗传模式进行了总结,并详细综述了利用“亲和基因”克服籼粳杂种不育性的两种有代表性的学说-广亲和基因和特异亲和基因分子定位的最新研究进展,并提出了两“亲和基因”共同利用的初步设想:将聚合了Si等位基因的粳型亲籼系与聚合了不同广亲和基因(中性亲和基因的广亲和力强、亲和谱广泛的粳型品种进行杂交和回交,选育出聚合不同广亲和基因和Si等位基因的粳型亲籼系,再与籼稻品种杂交,真正实现直接利用籼粳亚种间杂种优势。 相似文献
10.
P. D. Walton 《Euphytica》1971,20(3):416-421
Summary Two methods were used to analyse the relationship between 14 traits recorded from an 8×8 diallel cross between varieties of spring wheat. The stepwise regression analysis which introduces characters into a multiple regression equation in the order in which they contribute to yield, together with factor analysis was used to analyse the same dependence structure. The 14 causes were grouped into the basic factors which generate the dependence structure. The two methods were found to give complementary information. The way in which such knowledge would assist the plant breeders in making selections was demonstrated. 相似文献
11.
利用乙醇抽提不同植物中的inositol类物质,将其抽提物中的水溶相部分依次通过ODS柱和阴离子交换柱后,用HPLC法进行分析。结果表明,D-pinitol含量多的植物有槐树叶、红花三叶草、白花三叶草、繁缕、银杏叶、婆婆指甲菜;D-chiro-inositol含量多的植物有蒲公英、白背;ononitol含量多的植物有槐树和婆婆指甲菜;myo-inositol含量多的植物有金银花、柿子叶、蒲公英、桑树叶。 相似文献
12.
13.
用复合氨基低聚糖抗病增产剂在不同区域对小麦、玉米、水稻进行了田间小区试验,结果表明,该制剂浸种或在不同时期喷施,均可使产量增加,小麦增产20.8℅,玉米10.6℅,水稻15.6℅,随机方差分析达到显著或极显著水平。田间调查和考种结果表明,小麦、玉米、水稻的穗粒数和千粒重均高于对照,水稻浸种或喷施的叶绿素含量及干物重高于对照,小麦喷施的花后叶面积比对照高。 相似文献
14.
修剪对油茶果实经济性状的影响 总被引:3,自引:1,他引:2
以7年生油茶的4个品种为对象开展冬季修剪和春季修剪,研究修剪对油茶果实经济性状的影响,结果表明:修剪能提高油茶果实的单果重、果径、单果籽粒数、籽粒大小、出籽率和含油率,且冬季修剪对各指标的提升效果优于春季修剪;冬季修剪的平均单果重达28.4 g,分别比春季修剪和对照的平均单果重高3.3 g和5.9 g;春季修剪的鲜果出鲜籽率和鲜果出干籽率分别为36.7%和19.6%,分别显著高出对照28.3%和41.0%,但与冬季修剪的差异不显著;冬季修剪和春季修剪的鲜果含油率分别为6.0%和5.0%,分别比对照高出62.2%和35.1%;不同品种对修剪的反映效果不一样,主要表现在不同的修剪时间的各经济指标的高低变化趋势差异较大。 相似文献
15.
16.
利用组织培养技术,对生姜进行茎尖培养,筛选出适合丛生芽快速繁殖的培养基配方(MS+6-BA2.0mg/L+NAA0.1mg/L);对生姜组培苗进行炼苗和移栽试验,结果炼苗提高移栽成活率的作用最大,壮苗加炼苗移栽成活率最高,可达100%;组培苗生产的一代姜,姜块小、姜体健康,适宜用作种姜;二代姜姜块大、产量高,商用价值与经济效益好。 相似文献
17.
18.
油母页岩及其废弃物对氮磷钾的吸附解吸特性研究 总被引:1,自引:0,他引:1
探明油母页岩(尾矿和贫矿)及其废弃物(灰渣)对氮、磷、钾离子的吸附及解吸特性,为进一步拓展油母页岩及其废弃物在农业上的应用提供理论参考。采用平衡法对氮、磷、钾离子的吸附及解吸特性展开深入研究。结果表明,油母页岩及其废弃物对氮的吸附量和解吸率以尾矿最大,其最大吸附量和平均解吸率分别为1429mg/kg和73.72%,是灰渣和贫矿的1.86、1.04倍和2.29、1.09倍;尾矿对磷的吸附量和解吸率均最大,其最大吸附量和平均解吸率分别为909.1mg/kg和13.86%,是灰渣和贫矿的1.27、2.67倍和2.45、1.22倍;对钾的吸附量和解吸率也以尾矿最大,其最大吸附量和平均解吸率分别为2500mg/kg和87.20%,是贫矿和灰渣的2.00、1.03倍和4.25、1.22倍。由此可见,油母页岩尾矿对氮、磷、钾的吸附解吸能力均最强,具有作为土壤保肥物质开发的可能性。 相似文献
19.
In accordance with the deficient elongation of the Stretching-bending Rectifier, as well as the severe wear and slipping of V-belt , the driving system velocity ratio of rectifier and the calculation formula of the theoretical elongation are deduced, which are based on the analysis of its structure and reeling principle. The carrying capacity of the driving system is also analyzed and it reaches the main reason for the elongation of the stretching-bending rectifier that cannot reach request, which is caused by the step less torsion of fixed output of the continuously variable transmission. The improvement measure which can be achieved by increasing the stiffness of the spring to increase the output torsion of the continuously variable transmission is proposed. Thus it makes the actual coefficient of elongation,which can satisfiy the producing request. 相似文献
20.
Based on the principle of electromagnetic induction of exchange and the measurement principle of the ring space array torque which is related to the sphere symmetry, the measurement principle of a ring space array torque sensor is discussed which is fit for measuring in extreme environment. The reader head electrocircuit is designed which is combined with the problems on measurement of mechanical torque in extreme environment. The experimentation is emulated and the preferably satisfied result is gained. 相似文献