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近年来,黑龙江省部分地区遭受不同程度的低温冷害,导致了水稻延迟型、障碍型冷害,并加剧了稻瘟病的发生,导致种子成熟度差,空秕率高。由于秋雨大、降雪早,种子含水量高,严重影响了种子芽率。作者针对影响芽率的主要原因,并提出以下几点建议。 相似文献
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本文论述了萌发种子冷害的影响因素,萌发种子冷害的生理生化变化及冷害发生机制的研究进展,热刺激和化学试剂刺激处理,湿冷锻炼,预温浸种及种子引发等种子处理方法对预防萌发种子冷害的效果。 相似文献
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在高粱制种生产上,由于各种因素的影响和不同自然灾害的发生,经常出现种子芽率降低的现象。千阳县种子公司多年来高粱种子芽率一直不高,并有逐年下降的趋势,2000年抗四高粱种子平均芽率下降2.27%,抗七下降21.66%;2001年抗四下降9.78%。芽率的下降直接影响种子生 相似文献
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杂交水稻种子质量的影响因素及对策 总被引:3,自引:1,他引:2
种子质量是由种子不同特征、特性综合而来的一个概念.在水稻生产上要求种子具有优良的品种特性和优良的种子特性。通常包括品种质量和播种质量两个方面的内容.可概括8大方面的指标:真、纯、净、饱(千粒重)、壮(芽率)、健(病虫感染)、强(活动芽势)、干。杂交水稻种子最重要的是真、纯、壮(芽率)3个指标。如果种子失去真实性.不是原来所需要的优良品种.那么就会延误农时.甚至颗粒无收;品种纯度高的种子因具有该品种的优良特性而可获得丰收. 相似文献
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高活力杂交番茄种子的生产技术研究甘肃省酒泉地区种子公司(酒泉735000)郭帆,王建现种子的活力也称种子的健度,它包括种子的芽率、芽势、贮藏性能以及在逆境条件下的出苗能力等。高活力番前种子,在外部特征上表现为发育良好,籽粒饱满,色泽新鲜;在生理活性上... 相似文献
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穗芽指禾谷类作物收获前因天气久雨不晴,高温高湿诱发谷粒在穗上发芽。在我国,穗芽最常见于杂交水稻制种F1种子。在杂交稻种子生产过程中,种子乳熟期后因高温高湿天气诱发穗芽或发生早萌性生理变化而严重影响杂交稻的种子质量。根据调查,平均每年杂交稻种子质量因内部早萌性生理变化而导致的种子生活力下降的幅度在10%以上,因穗芽而减产10%~20%,严重的达50%以上,由此种子丧失再生产功能和商业价值。 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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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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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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南瓜降糖功能及其系列食品加工技术 总被引:3,自引:0,他引:3
阐述了南瓜在糖尿病辅助治疗方面的功能特性,介绍了南瓜降糖主要制品南瓜全粉、南瓜脆片、南瓜果酱和南瓜肉汁的工艺流程和操作要点。 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
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