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苏丹草大斑病菌的生物学特性研究 总被引:2,自引:0,他引:2
对苏丹草大斑病菌生物学特性的研究,为进一步探讨该病的流行规律及制定综合防治措施提供理论依据.本试验研究了温度、pH、光照、营养条件对苏丹草大斑病菌营养生长的影响及温度、pH、湿度、营养条件对该菌孢子萌发的影响.结果表明,苏丹草大斑病菌生长的温度范围为10~35℃,最适温度为25℃;pH范围5.0~9.0,最佳为8.0;光照对菌丝生长无显著影响.在试验的培养基中以PDA+苏丹草种子煎汁是生长最好的.该菌孢子萌发的温度为10~35℃,最适温度为20℃;pH范围3.0~9.0;在相对湿度为100%的条件下容易萌发,水滴中更易萌发.1%的葡萄糖液、1%乳糖液、1%蔗糖液及2%苏丹草种子煎汁都能促进孢子萌发,而1%蔗糖液是最适宜该菌孢子萌发的液体环境.生物学特性表明,该菌对营养要求不高,对环境适应力较强的病原菌. 相似文献
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通过测定江孜沙棘种子千粒重、种子活力,采用不同光照条件(全光照、暗培养)、不同基质(纸质、沙质),设置0~5、5~10、10~15、15~20、20~25、25~30℃6个温度梯度(取温度梯度中值)进行发芽试验,以探索江孜沙棘种子萌发特性。结果表明:江孜沙棘种子千粒重为7.359g,TTC法测得种子活力为91%;不同光照条件和不同基质对江孜沙棘种子最终发芽率均无显著影响,但暗培养、沙质基质条件更有利于种子萌发;温度对江孜沙棘种子萌发有显著影响,种子萌发最适温度为20~25℃。在江孜沙棘育苗生产中,适当遮荫、保持土壤通透、提高温度等措施更能有效促进种子萌发。 相似文献
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温度、湿度、pH值及NaCl浓度对花生种子萌发的影响 总被引:1,自引:0,他引:1
以鲁花19号和鲁花23号花生种子为试验材料,研究不同的温度、湿度、pH值及NaCl浓度对花生种子萌发的影响。结果表明:随着温度、湿度、pH值的增加,花生种子的发芽率、发芽势、发芽指数均呈现先升高后降低的趋势。鲁花19号花生种子萌发的最适温度为25℃,最佳土壤湿度为40%,最适pH值为6;鲁花23号花生种子萌发的最佳温度为30℃,最佳土壤湿度为40%,最适pH值为7。随着NaCl浓度的增加,花生种子的发芽率、发芽势、发芽指数呈下降趋势。鲁花23号比鲁花19号耐旱性、耐盐性强。 相似文献
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尖萼耧斗菜种子萌发特性研究 总被引:1,自引:0,他引:1
对尖萼耧斗菜(Aquilegia oxysepala Trautv.et Mey.)种子萌发特性进行了研究。结果表明,尖萼耧斗菜种子含水量为10.7%,具有良好的吸水性;种子萌发最适温度为变温昼20℃/夜15℃;光照对尖萼耧斗菜种子萌发有显著影响,最适光照条件为每天光照8 h;种子无需低温休眠,采收后直接播种即可发芽。 相似文献
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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。 相似文献
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DENG Zhao-jing 《保鲜与加工》2005,(1):153-156
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. 相似文献
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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. 相似文献
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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。 相似文献
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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。 相似文献
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母猪繁殖障碍成因分析 总被引:3,自引:0,他引:3
繁殖障碍是导致母猪淘汰的最主要因素,直接造成母猪非生产天数延长,繁殖猪群生产效率降低,严重影响猪场的经济效益。本文作者对引起母猪繁殖障碍的多方面因素,包括营养因素(如饲养水平、饲料品质、断奶日龄)、环境因素(如温度、湿度、通风、光照)、疫病因素、生产技术及管理因素进行了详细阐述。 相似文献
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Applicability of molecular markers in the context of protection of new varieties of cucumber 总被引:2,自引:0,他引:2
G. P. Bernet S. Bramardi D. Calvache E. A. Carbonell M. J. Asins 《Plant Breeding》2003,122(2):146-152
The growing number of candidate varieties presented every year at each national Plant Variety Protection Office and their decreasing genetic variability forces strategies to be adopted that will reduce costs without losing rigour when deciding about the acceptance or rejection of a candidate variety. Molecular markers have been envisaged as a reliable tool to establish differences, but can molecular markers be used for assessing distinctness? A comparison between a molecular and a morphological characterization of 41 seed samples belonging to 36 cucumber varieties and including several external controls has been carried out to investigate the applicability of molecular markers in the context of distinctness, uniformity and stability (DUS) tests and the protection of new varieties. Both types of character indicate the same relationships among main groups, Dutch and Beth‐Alpha types, and Gerking and Slice types, the correlation between distance matrices being only 0.6489. Varieties considered uniform for morphological traits proved not to be so for molecular markers. Therefore, molecular characterization is not offering the same estimates of uniformity and relatedness between varieties as does morphological characterization. External controls were used to establish distinction limits with morphological and molecular dendrograms to focus on those varieties, which were suspiciously similar. The results with cucumber show that molecular identity could be used to assess any lack of distinctness and so corroborate the morphological assessment of candidate varieties. The morphological trait ‘type’ provides distinct characterization of varieties and the molecular characterization of candidate varieties could be used to design better field experiments to assess distinction within each group of morphological cucumber type. 相似文献