共查询到20条相似文献,搜索用时 78 毫秒
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近年来,我公司引进韩国梨瓜品种,根据其开花习性和授粉、受精特点进行杂交制种,取得了很好的效果。1土地准备梨瓜制种应选择肥沃的沙壤土种植,前茬以小麦、玉米为宜,与其他瓜类蔬菜实行3年以上轮作。与其他梨瓜品种隔离500m以上。春季深耕耙耱,保证土壤疏松,底墒良好。施优质农家肥4.5万~6.0万kg/hm2,磷肥600~750kg/hm2,复合肥300kg/hm2。梨瓜制种田应用高畦栽培,水旱塘宽2m,旱塘宽1.6m,水塘宽0.4m,沟深0.4m,以南北行向较好。播种前7~10d覆膜。2播种 相似文献
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正1选地,隔离1.1选择制种地玉米制种地应选择土层深厚、土壤肥沃、排灌方便的壤土或沙壤土地,并且田间树木少或无树木遮阳的地块,漏沙地重盐碱地不宜制种,连续制种地应尽量做好作物的轮作。1.2隔离条件玉米制种田一般采用空间隔离,要求和异源玉米花粉的间隔距离达到300m。根据要求划定制种的地块必须隔离安全,不得混种和套种其他作物。 相似文献
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通过用不同瓜型的母本进行密度对比试验,研究杂交西瓜制种种植密度与产种量、千粒重之间的最佳配置。结果表明,在华北地区西瓜杂交制种时,长形瓜作母本亩植1100-1200株为宜,圆形瓜作母本植1300-1400株为宜。这样合理利用了不同瓜型生长所需的叶面积系数,在较高的种植密度下使果实发育基本正常,产种量、千粒重高,种子质量好。 相似文献
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提高西葫芦制种质量的几点措施山西省临猗县种子公司(044100)杨永裕1制种田的选择和瞩离区的设置制种田以选择在土地平坦、土壤肥沃、灌溉条件优越的壤土地为宜。制种田的隔离区一般要求100Om以上。父母本种植比例1:6~8,父本集中种植。2去杂去劣和去... 相似文献
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1土地选择
1.1制种地的选择
选择土壤肥沃,排灌方便的微酸性或中性沙壤土,前茬以小麦、豆类茬为宜,并远离马铃薯、棉花、甜菜田块,避免与瓜类蔬菜连作,应实行5~7年的轮作,以减少病虫害的发生。隔离区半径不少于100m,隔离区内禁止种葫芦科作物,并有良好的通风条件。 相似文献
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秋优1025种子在广西制种早制赶不上晚用.秋制又要贮存较长的一段时间,存在一定的贮藏风险。本文结合秋优1025在广西制种难的问题,根据其父母本特点,选择三亚为基地进行早造制种(早制),以阐明秋优1025的优质、0高产制种技术。 相似文献
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中国牧草育种工作研究进展 总被引:4,自引:0,他引:4
在综述中国牧草育种工作进展的同时,分析了牧草育种工作中存在的问题,主要包括育成的牧草品种少,良种推广和覆盖面积较小以及牧草育种理论基础薄弱等,并针对性地提出应从改进牧草育种的方法和途径、培育具有地方特色的独特牧草品种、加强种质资源的保护与利用、加快良种向现实生产力的转化以及通过各部门协作攻关等方面解决这些问题。 相似文献
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兰花试管开花研究进展 总被引:3,自引:1,他引:2
对兰花试管开花方面的研究进行了综述,着重介绍了兰科植物试管开花的影响因素及其调控和分子机理等方面的研究情况,指出目前存在的若干问题并提出解决对策。 相似文献
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中国稻草还田技术研究进展 总被引:5,自引:2,他引:3
随着中国农业的发展,大量稻草被焚烧或者弃置,这不仅浪费了养分资源还造成环境污染。本文综述了稻草还田的方式方法,稻草还田对土壤性状及水稻产量的影响以及稻草还田对水稻氮素吸收和氮肥利用率的影响,以期待稻草还田技术可以进一步推广应用。 相似文献
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Twenty two Uromyces appendiculatus isolates were tested on 20 differential and 25 Ecuadorian Phaseolus vulgaris cultivars in the seedling stage. Based on the infection types 20 races could be discerned. The Ecuadorian cultivars differed
greatly in their reaction to the isolates, from resistant to only one isolate (`Red Small Garden') to resistant to all isolates
(’G2333‘). The isolates showed a wide range of virulence to the Ecuadorian cultivars, from virulent to only two cultivars
(isolate 13) to virulent to 21 cultivars (isolates 5 and 23).
Seven cultivars with a basically susceptible infection type appeared to differ greatly in quantitative resistance when tested
in three consecutive crop cycles. The disease severities in percentage leaf area affected averaged over the three cycles ranged
between 83.9% for ‘Red Small Garden’ and 13.1% for ‘INIAP-414’.
Race-specific resistance does not seem an advisable breeding strategy, but the quantitative resistance offers a good alternative. 相似文献
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低温胁迫是限制植物生长发育和地理分布最主要的环境因子之一,影响植物细胞膜系统、抗氧化系统、光合作用、次生代谢等诸多方面,对农业生产和发展有严重影响。因此,揭示作物在冷胁迫下的生理及分子机制是十分必要的,这有助于培育耐寒作物品种,从而减少生产损失,扩大作物种植面积,具有重要的生产价值和经济效益。目前,基于RNA-seq技术进行植物低温胁迫分子机制深度解析在拟南芥、水稻、油菜、茶树、小麦、烟草、高粱等重要作物上得到了发展应用。本研究综述了近年来植物在低温胁迫或低温适应过程中的转录组学研究现状,以期为高通量测序技术在植物抗性研究方面提供方法借鉴和理论基础。 相似文献
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Toshihiro Saito 《Breeding Science》2016,66(1):46-59
The Japanese pear (Pyrus pyrifolia Nakai) is one of the most widely grown fruit trees in Japan, and it has been used throughout Japan’s history. The commercial production of pears increased rapidly with the successive discoveries of the chance seedling cultivars ‘Chojuro’ and ‘Nijisseiki’ around 1890, and the development of new cultivars has continued since 1915. The late-maturing, leading cultivars ‘Niitaka’ and ‘Shinko’ were released during the initial breeding stage. Furthermore, systematic breeding by the Horticultural Research Station (currently, NARO Institute of Fruit Tree Science, National Agriculture and Food Research Organization (NIFTS)) began in 1935, which mainly aimed to improve fruit quality by focusing on flesh texture and black spot disease resistance. To date, 22 cultivars have been released, including ‘Kosui’, ‘Hosui’, and ‘Akizuki’, which are current leading cultivars from the breeding program. Four induced mutant cultivars induced by gamma irradiation, which exhibit some resistance to black spot disease, were released from the Institute of Radiation Breeding. Among these cultivars, ‘Gold Nijisseiki’ has become a leading cultivar. Moreover, ‘Nansui’ from the Nagano prefectural institute breeding program was released, and it has also become a leading cultivar. Current breeding objectives at NIFTS mainly combine superior fruit quality with traits related to labor and cost reduction, multiple disease resistance, or self-compatibility. Regarding future breeding, marker-assisted selection for each trait, QTL analyses, genome-wide association studies, and genomic selection analyses are currently in progress. 相似文献