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瓜类蔬菜集约化嫁接育苗是提高其产量和品质的重要方式,阐述了主要瓜类蔬菜的集约化嫁接育苗技术要点,深入分析瓜类蔬菜集约化嫁接育苗过程中可能出现的各种问题,并提出了相应的技术对策。 相似文献
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《中国瓜菜》2020,(8)
瓜类蔬菜是重要的蔬菜种类,广泛种植于世界各地。瓜类蔬菜多为蔓生作物,生产中通过设立支架提高产品的产量与品质。近年来,随着分子生物学的快速发展和基因工程技术的深入研究,对作物矮生性状及其相关基因的研究也愈加深入,应用基因工程技术对作物株高进行遗传改良已成为提高作物产量的有效途径,培育合理株型已成为作物育种的重要目标。矮生性状作为瓜类蔬菜育种中的一个重要的结构性状,也是当前瓜类蔬菜育种工作的热点。笔者综述了瓜类蔬菜矮生性状的遗传学研究进展,特别是黄瓜、西瓜、南瓜和甜瓜等主要瓜类蔬菜矮生性状相关基因的遗传学分析、基因定位以及基因克隆等方面的研究进展,并对瓜类蔬菜矮生性状在作物分子育种中的应用和发展趋势进行了展望。 相似文献
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白粉病是瓜类蔬菜的主要病害之一,严重影响瓜类蔬菜的产量和品质。抗病育种是解决白粉病对瓜类蔬菜生产危害的一条重要途径。为给瓜类蔬菜白粉病抗性育种工作提供参考和借鉴,综述了在病原菌、抗性鉴定方法、抗性遗传规律、抗性种质、抗病品种选育以及分子标记技术的应用等方面的研究现状,分析了现阶段研究中存在的问题,并对研究前景进行了展望。 相似文献
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《中国瓜菜》2019,(10):26-29
为收集、保存和了解江西省蔬菜种质资源现状,以江西省农作物种质资源普查与收集行动为基础,共收集到233份瓜类蔬菜资源。采用查阅文献、实地调查和田间试验相结合的方法,通过对分布在江西省11个县(市、区)、40个乡(镇)、120个村及普查县瓜类蔬菜种质资源分类、分布规律、性状特点及优异资源的重点分析。结果表明:瓜类蔬菜地方品种有6个科;部分地方品种品质较好,但纯度低、退化严重;都昌县、崇仁县、寻乌县具有丰富的瓜类蔬菜地方品种。本文对调查地区瓜类蔬菜资源现状、特色资源农艺性状特点及保护与利用进行了分析,研究结果可为江西省瓜类蔬菜地方资源的合理利用及育种工作提供参考。 相似文献
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受合肥华夏西瓜甜瓜育种家联谊会派遣,笔者和陈会中秘书长以及新疆哈密瓜研究中心伊鸿平研究员、中国农业科学院郑州果树研究所徐志红副研究员一起,参加了以吴明珠院士为首的新疆哈密瓜研究中心赴乌克兰瓜类科技考察团。考察团于2004年9月先后访问了乌克兰农业科学院哈尔科夫瓜类蔬菜研究所(北方)和赫尔松瓜类蔬菜研究所(南方),并对乌克兰瓜类蔬菜进行了科技考察和学术交流。 相似文献
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Cecil C. Konijnendijk Anders Busse Nielsen Jasper Schipperijn Yngve Rosenblad Heldur Sander Mikk Sarv Kirsi Mkinen Liisa Tyrvinen Janis Donis Vegard Gundersen Ulrika kerlund Roland Gustavsson 《Urban Forestry & Urban Greening》2007,6(4):297-309
A review of research and research needs in urban forestry was carried out in Denmark, Estonia, Finland, Latvia, Norway and Sweden during 2005. A questionnaire addressing post-2000 and ongoing research was sent to 146 researchers and generated 76 completed questionnaires. Universities were found to lead urban forestry research, while municipalities headed funding organisations in terms of number of projects funded. Planning, ecological and management aspects were the most common research themes, but socially oriented research also played an important role. The research needs questionnaire was sent to 192 key research actors (assignors, users and researchers), resulting in 63 completed needs assessments. The research themes of ‘urban forest management’, ‘social and cultural values’ and ‘urban forest and green planning’ were prioritised for future research. Comparison of ongoing research and research needs showed discrepancies, as ongoing research does not always cover the same themes identified as primary research needs. Priorities for future research as identified by the research community respective those assigning and using research also differed. Economic assessment of benefits, for example, scored much higher as a need among researchers than other respondents. In terms of present weaknesses in the research ‘infrastructure’, research actors emphasised lack of funding, fragmentation of research and insufficient critical mass. The region's urban forestry research can be enhanced and made more meaningful by strengthening national and international networking within the research community, across disciplines, as well as between researchers and those commissioning and using research. 相似文献
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The Mediterranean region is facing many challenges, some of which can be addressed by nature-based solutions such as urban forests and green space. However, at best, urban forest research from Mediterranean countries has been only briefly addressed in review papers up to date. This Scopus-based review paper provides first insights into the development of urban forest research in the Mediterranean in the 20-year period from 1996 to 2015. The purpose of the review was to a) analyse distribution of urban forest research in the Mediterranean and identify countries that are forerunners based on the number of publications, b) to analyse distribution of research themes across the Mediterranean and per country, and hence point to research gaps and needs. Researchers from Italy, Turkey and Spain were the most productive in the analysed period. Research is mainly concentrated in the North, while it is scarce to non-existent in South and Eastern Mediterranean countries (excluding Turkey and Greece). Papers dealing with pollution, human health and sociocultural values were the most frequent. Some countries exhibited research specialisation with regard to certain themes. For instance Italian researchers mostly focused on topics related to pollution and urban forest management, the majority of Spanish papers addressed urban forests in the context of human health, while sociocultural values were the main research theme for researchers from Turkey. Papers were analysed also based on research methods, approaches and study locations. Suggested future research includes analysis of the quality of knowledge related to urban forests in the Mediterranean as well as of collaboration between researchers, research institutions and countries. 相似文献
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Research mapping is a method of organising research information as part of a process of formulating a research policy in a specific area. A research mapping project was undertaken in the UK, which aimed to map existing and future research into public and green space, to identify gaps in order to help set priorities for future research, and to develop a freely accessible and searchable database of this research. The mapping was structured around two axes. The first axis was of research themes based on The Value of Public Space but developed further and broken down into sub-themes. The second axis was a typology of green and public space based around Planning and Policy Guidance Note 17 (PPG17) with elaboration from Green Spaces, Better Places. Research dating back to 10 years was collected together with information on recently completed, ongoing and planned UK research. Only research meeting specific quality criteria was included. Some information was also collected at a seminar where attendees from a range of organisations were invited to offer their perspectives on where research priorities should be directed. All the material was analysed and the main trends were identified. Three key cross-cutting themes common to much of the research were identified. These are the general lack of baseline surveys against which to assess progress over time; methodological issues, especially the need to standardise data collection methods and techniques; the classification of social groups, currently considered to be too crude.It was found that most research has been undertaken on physical aspects, such as planning and on biodiversity. Economic values have also been a focus, but on a smaller scale. Social research is quite well covered but very patchy. Management is better covered than maintenance. By far the weakest area represented in the research is health and well-being, both in terms of social groups and types of green space. Priorities for further research were then identified. 相似文献
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中国缓、控释化肥的研发进展 总被引:1,自引:0,他引:1
缓、控释肥料是未来肥料产业的发展的重要方向之一.该文综述了近年来我国缓、控释肥料的开发和产业化现状,分析了相关研发存在的问题,提出了中国缓、控释肥料研发应进一步采取的对策. 相似文献
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