非灭菌条件下VA菌根真菌促进玉米吸收磷,氮营养的效应

非灭菌条件下在田间小区研究了潮土接种ＶＡ菌根真菌（Ｇｌｏｍｕｓ ｓｐ）玉米的影响。试验表明，在每公顷６０ｋｇＰ２Ｏ５的条件下接种ＶＡ菌根，植株含磷量，含氮量，生长状况、产量及品质均高于未接种的植株。石灰性土壤由于高ｐＨ值的缘故，使得磷矿粉＋ＶＡＭ处理的效果比ＶＡＭ＋过磷酸钙的处理稍差，无外加磷源公接种ＶＡ菌根的处理，其效果接近于施磷肥的对照。     

棉花枯、黄萎病原菌全细胞脂肪酸气相色谱分析

棉花枯、黄萎病原菌全细胞脂肪酸气相色谱分析ＧａｓＣｈｒｏｍａｔｏｇｒａｐｈＡｎａｌｙｓｉｓｏｎｆｕｌｌＣｅｌｌＦａｔＡｃｉｄＣｏｎｔｅｎｔｏｆＢｏｔｈＦｕｓａｒｉｕｍａｎｄＶｅｒｔｉｃｉｌｌｉｕｍｗｉｌｔｓｏｆＣｏｔｔｏｎ枯、黄萎病是棉花生育过程中两...     

分子标记在棉花品种改良方面的应用

分子标记在棉花品种改良方面的应用①ＡｐｐｌｉｃａｔｉｏｎｏｆｔｈｅＭｏｌｅｃｕｌａｒＭａｒｋｅｒｉｎＣｏｔｏｎＶａｒｉｅｔｙＩｍｐｒｏｖｅｍｅｎｔ棉花详细的染色体分子图谱的构建为快速、高效的品种改良提供了新的机遇。Ｒｅｉｎｉｓｈ（１９９４）构建了较详...     

VA菌根促进青椒生长的生理研究

青椒播种育苗时，分别接种Ｇｌｏｍｕｓｅｐｉｇａｅｕｍ和Ｇｌｏｍｕｓｍｏｓｓｅａｅ两种ＶＡ菌根真菌，结果，不论在灭菌土上，还是在不灭菌土上，接种株的营养生长，生殖生长，磷，氮吸收，叶面积，叶绿素含量，净光合强度，维生素Ｃ含量增显著优于对照株。低温处理后，接种株相对电导率低于对照株，可溶性糖含量高对照株。说明接种ＶＡ菌根真菌，可促进青椒生长，提早现蕾开花，增强抗冷性，延长育期，为提高青椒产量和品质奠定     

NAWF在美国棉花生产上的应用

ＮＡＷＦ在美国棉花生产上的应用①ＡＰＰｌｉｃａｔｉｏｎＮＡＷＦｉｎｃｏｔｏｎｐｒｏｄｕｃｔｉｏｎｉｎＵＳＡＮＡＷＦ（ＮｏｄｅｓＡｂｏｖｅＷｈｉｔｅＦｌｏｗｅｒ），或称ＮＡＷＢ（ＮｏｄｅｓＡｂｏｖｅＷｈｉｔｅＢｌｏｏｍ），指在棉株几何空间上近主茎顶端而...     

利用农田水量平衡模型评价棉田不同的灌溉制度

本文以田间试验为基础，应用农田水量平衡理论和棉花对不同水分亏缺的反应，建立了一个棉花不同灌溉制度的评价模型，文中用ＦＡＯ－４６提供的Ｐｅｎｍａｎ－Ｍｏｎｔｅｉｔｈ方法计算了棉花生育期间逐日参考作物蒸散量，利用Ｉｓａｒｅｇ模型［５］计算了棉田逐日实际蒸散量。研究结果表明，利用农田水量平衡模型可对棉花灌溉进行有效管理。通过对几种灌溉方案的评价，定量化地分析了不同灌溉制度对棉花产量的影响程度和水分胁迫出现的时间；明确了在黄淮海平原棉田灌溉重点在棉花生育前期，即苗期，盛蕾－初花期；给出了该地区棉花各生育时期的需水量和每日的平均耗水强度     

水分胁迫对玉米幼叶质膜ATPase活性影响及其与钙调素和渗透调节的关系

０．５ＭＰａＰＥＧ－６０００胁迫２４ｈ明显刺激三叶期玉米幼苗，第三叶质膜ＡＴＰａｓｅ活性提高，并且Ｖｍａｘ增加近一倍，而Ｋｍ值却降低；水分胁迫下渗透调节因子脯氨酸累积，Ｋ含量则呈现先上升后下降的趋势，渗透调节的起动与质膜ＡＴＰａｓｅ活性上升可能无直接关系。实验也表明质膜ＡＴＰａｓｅ活性被三氟拉嗪（ＴＦＰ）促进而受钙调素抑制，由此推断质膜ＡＴＰａｓｅ在钙调素参与的磷酸化后活性降低。     

水分胁迫与玉米幼叶质膜ATPase活性影响及其与钙调素和渗透调节的…

０．５ＭＰａＰＥＧ－６０００胁迫２４ｈ明显刺激三叶期玉米幼苗，第三叶质膜ＡＴＰａｓｅ活性提高，并且Ｖｍａｘ增加近一倍，而Ｋｍ值却降低；水分胁迫下渗透调节因子脯氨酸累积，Ｋ含量则呈现先上升后上降的趋势，渗透调节的起动与质膜ＡＴＰａｓｅ活性上升可能无直接关系。实验也表明质膜ＡＴＰａｓｅ活性被三氟拉嗪（ＴＦＰ）促进而受钙调素抑制，由此推断质膜ＡＴＰａｓｅ在钙调素参与的磷酸化后活性降低。     

我国棉花黄萎病菌群体遗传分析研究初报

我国棉花黄萎病菌群体遗传分析研究初报ＰｒｅｌｉｍｉｎａｒｙＳｔｕｄｙｏｎｔｈｅＧｅｎｅｔｉｃＡｎａｌｙｓｉｓｏｎＣｏｔｏｎＶｅｒｔｉｃｉｌｉｕｍＰａｔｈｏｇｅｎ黄萎病菌是严重威胁我国棉花生产的主要病害，系统侵染、抗逆性强，极难防治。棉花黄萎病菌的分子...     

棉蕾脱落原因及落蕾对产量的影响

棉蕾脱落原因及落蕾对产量的影响ＦａｃｔｏｒｏｆＣｏｔｔｏｎＢｏｌｌＡｂｓｃｉｓｓｉｏｎａｎｄＩｔｓＩｎｆｌｕｅｎｃｅｏｎｔｈｅＹｉｅｌｄ美国亚利那桑州棉花研究所经５年观察研究对棉蕾脱落的解释如下：１蕾的部位与产量间的关系根据棉花生理特性，开花部位极不...     

冷冻干燥速溶蛋花汤的加工技术

介绍了运用冷冻干燥技术进行速溶蛋花汤的加工,研究了生产工艺、特点以及影响产品质量的主要因素。试验表明,采用冷冻干燥技术加工的速溶蛋花汤,具有营养丰富、风味独特、方便快捷等特点。     

Measuring of Quantity of Matter-mass and the Measuring of Inertia of Matter-momentclm

A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed.     

香蕉遗传转化方法研究进展

香蕉是热带亚热带发展中国家重要的粮食作物和碳水化合物来源。但近年来,香蕉生产受到严重的病虫危害。大多数香蕉栽培品种是三倍体,生长周期长,而且不孕。由于没有种子,给繁殖和育种带来一定的困难。遗传转化技术的发展为香蕉品种的改良提供了一种有效的手段。香蕉的遗传转化方法有电激法、基因枪法、农杆菌介导法等。农杆菌介导法的应用是香蕉品种改良的一个重大突破。香蕉遗传转化的外植体也发展到多种,有原生质体,胚性细胞悬浮系,分生组织,以及横切薄片等。近几年,随着分子生物学的发展,出现了转化效率更高,重复性更好的香蕉遗传转化技术。如农杆菌和基因枪结合法,离心辅助农杆菌介导法、真空渗透技术等。这些新技术新方法的出现,必将推动香蕉产业高速发展。     

壳聚糖对石榴果汁澄清效果的影响

利用壳聚糖的絮凝作用对壳聚糖在甜石榴汁澄清中的应用效果进行了研究,试验结果表明,壳聚糖用量为0.3g/L、澄清时间为60min、温度为35℃时,甜石榴汁透光率可达85%以上,且通过对壳聚糖处理前后可溶性固形物、总酸、VC等营养成分含量的比较,确定以上工艺参数为甜石榴汁澄清的最佳选择。     

新疆布尔津县土地利用格局特征研究

基于RS与GIS技术,利用景观生态学理论及景观格局指数对布尔津县土地利用现状进行定量分析。结果显示为：（1）布尔津县以草地、林地为主要景观类型,镶嵌着耕地、水域等景观类型。（2）四个分区（即高山区、丘陵区、平原区、荒漠区）的林地资源组成差异明显,耕地、居民、交通及工矿用地集中分布在丘陵区和平原区（3）从各项指数来看,高山区的多样性指数较低;平原区是受人文因素最多的区域,景观优势度低,各种土地利用类型比例差异不大,有利于生态可持续发展,但要合理的开发利用;荒漠区生态环境相对脆弱,要加强生态环境的保护与改善。通过该研究对布尔津县的土地利用现状作一个了解,为该县乃至整个地区的景观规划和可持续发展战略提供科学依据。     

酸枣幼根原生质体的制备

以生长6～9 d的酸枣种子幼根为试验材料,0.7 mol·L-1甘露醇作为渗透压稳定剂、pH值5.5～6.0、28℃恒温水浴条件下,以光学显微镜观察的水解总时间、初始产生原生质体的时间、原生质体产量及细胞碎片量为指标,研究通过酶水解来制备酸枣幼根原生质体的方法.结果表明,在含1％果胶酶+4％纤维素酶R-10+3％纤维素...     

影响核桃贮藏品质因素的分析

介绍了几种核桃贮藏方法,综述了影响核桃贮藏品质的几个主要因素,以及针对上述影响因素提出若干解决对策.     

The Simulation of Comfort of Nine DOF of Automobile

Automobile comfort dynamic simulation is necessary when we predict and evaluate the comfort of a automobile or optimize performance of automobile. The nine DOF vibration model of automobile is established , which acts root mean square value of body in multiple work conditions as comfort evaluation indices. Based on the comfort simulation, the Hongyan 1160 is predicted in the way of comfort. The programmes can be used in many different automobiles . The computational result indicates that the model can simulate vibration of automobile truly. It is significant to research automobile comfort evaluation to optimize performance of automobile and comfort simulation .The computational program can be applied to optimize or simulate which has some reference value.     

Efficiency of water use of early plantings of sunflower

Rain fed crop production in Mediterranean environments depends to a large extent on strategies that avoid the intense summer drought. Early plantings of sunflower have given consistently higher yields in such environments, but the basis for such yield increases has not been explored. We conducted two field experiments at Cordoba (Spain) to investigate the effects of an early and a late planting date on the components of water-limited crop productivity; namely, water use (T), water use efficiency (TE) and harvest index (HI) of sunflower. The results were generalized by simulating rain fed sunflower yields, under early (1 January) and late (15 March) plantings, for a 25-year period with the aid of a simulation model of the Ceres type (OILCROP-SUN) which has been validated in Cordoba. Experimental seed yields of early plantings in 1989 and 1996 were 2.0 and 3.0 t ha⁻¹, while late plantings yields were 1.3 and 2.4 t ha⁻¹, for the 2 years. Average simulated yields were 2.7 ± 1.1 and 1.9 ± 0.7 t ha⁻¹ for early and late plantings, respectively. For the 2 years, T of early plantings was higher than that of late plantings, but the response of TE and HI to planting date was not the same in the two experiments. In the simulation exercise, T and TE of early plantings were consistently higher than those of late plantings, while there were no differences in the HI for the two planting dates. We conclude that early plantings of sunflower increase rain fed yields by increasing both T and TE, while the impact of planting date on HI very much depends on the crop water stress pattern, which is quite variable from year to year even in the predictable Mediterranean environment.     

Establishment of High-frequency Regeneration System of Explants of Alfalfa

The cotyledon and hypocotyl of eight varieties of alfalfa( Medicago sativa L. )are used to study the effect of different cultivation procedures and genotypes on embryogenic callus and embryoid induction,plant development and transplant of alfalfa.The varieties of alfalfa with high embryoid induction rate and high differentiation rate are screened. A high frequency regeneration system for alfalfa tissue culture is established:which is benifical to the gene transformation of alfalfa.