共查询到20条相似文献,搜索用时 125 毫秒
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大白菜的杂种优势明显,在生产上已广泛应用。目前,普遍应用的大白菜杂交种制种方法有两种:一是利用雄性不育系做母本的杂交制种;二是利用自交不亲和系做母本的杂交制种。锦州地区是利用雄性不育系生产大白菜杂交种最早地区之一,主要是利用温敏型雄性不育系生产大白菜杂交种,起源于20世纪80年代,也就是锦州孙家湾新五号大白菜品种的成功选育,该项制种技术得以推广。孙家湾新五号大白菜的成功选育和温敏型雄性不育系在生产中的利用,为锦州市大白菜新品种研究和开发奠定了良好基础,现在,继孙家湾新五号大白菜之后,利用温敏型雄性不育系又陆续选育出一系列大白菜新品种,并已大面积用于生产。通过本人多年工作经验和实践,现将锦州温敏型雄性不育系大白菜杂交制种技术总结如下。 相似文献
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杂交大白菜制种高产技术山东省沂水县种子公司代聪和,王发胜,刘俊田近几年来,我县大白菜一代杂种制种面积发展较快,面积由1988年3hm2发展到100多hm2,产量由450kg/hm2提高到1200kg/hm2。通过制种,初步探索出一套杂交大白菜制种高产... 相似文献
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大白菜露地越冬杂交制种技术山东省枣庄市种子管理站公茂洪目前,大白菜主要采用早春阳畦育苗,利用自交不亲和系制种,制种产量低而不稳,籽粒饱满度差,粒重低。我站自1989年开始试验晚秋育苗、霜降定植、露地越冬进行大白菜杂交制种,获得成功。1994年通过了市... 相似文献
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济源位于河南省西北部,境内沟壑纵横,形成得天独厚的隔离屏障,是理想的蔬菜制种基地。我市因势利导,大面积发展大白菜制种,目前已形成万亩的规模。特别是近年来,采用大白菜露地越冬制种技术逐步取 相似文献
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当制种的大白菜苗在苗床上完成春化阶段后,正值2月下旬到3月上旬,随着土壤的全部解冻,大白菜就可以向大田移植了,而大白菜制种也进入了苗床后管理阶段。
1 移栽前的准备
1.1 安全隔离区的选择
大白菜的杂交制种,种子的纯度是制种的关键。因此,移栽田应选择2000m内无油菜、苔菜、黑菜等制种菜的地方,形成自然隔离区,防止杂花授粉,特别是农户的菜园内的制种白菜一定要除掉,以确保杂交种子的纯度。…… 相似文献
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大白菜的杂种优势明显,近年来国内外都在生产上广泛利用。由于大白菜为雌雄同花天然异交作物,所以在推广杂交种时首先要解决合理的制种方法,否则将无法保证杂种一代的种子质量。目前大白菜杂交种制种方法有两种:一是利用雄性不育两用系制种,二是利用自交不亲和系制种。这是完全不同的两种方法,使用得当都可获得杂交率高的杂种一代种子。 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