GA_3处理对天女木兰种子解除休眠过程中碳水化合物含量的影响   总被引：1，自引：0，他引：1  

刘月洋  陆秀君  李天来  吴可 《种子》2010,29(2)

研究了GA3对天女木兰种子在变温层积条件下解除休眠过程中碳水化合物的影响,以此探讨外源赤霉素(GA3)对层积过程中天女木兰种子解除休眠的作用机理。结果表明,1000mg/LGA3水溶液处理极显著促进天女木兰种子萌发,在整个层积过程中,GA3水溶液处理诱导淀粉含量下降;蔗糖含量变化剧烈,在层积90d降至最低,果糖和葡萄糖含量显著增加;在层积后期(90～120d)果糖和葡萄糖含量下降,蔗糖含量上升,从而说明了碳水化合物参与并调节了天女木兰种子休眠解除这一过程。  相似文献   

Effects of stocking density and algal concentration on the survival,growth and metamorphosis of Bobu Ivory shell,Babylonia formosae habei (Neogastropoda: Buccinidae) larvae     

Huaiping Zheng  Caihuan Ke  Zewen Sun  Shiqiang Zhou  Fuxue Li 《Aquaculture Research》2010,42(1):1-8

Independent and combined effects of stocking density and algal concentration on the survival, growth and metamorphosis of the Bobu Ivory shell Babylonia formosae habei larvae were assessed using a 5 × 5 factorial design with densities of 0.25, 0.5, 0.75, 1.00 and 1.50 larvae mL⁻¹ and algal concentrations of 5, 10, 15, 20 and 25 × 10⁴ cells mL⁻¹ in the laboratory. Larval growth, survival and metamorphosis were significantly affected by both the independent effects of stocking density and algal concentration and by their interaction. The highest per cent survival (72.5%) and metamorphosis (49.5%), fastest growth (41.57 μm day⁻¹) and shortest time to initial metamorphosis (10 days) all occurred at the lowest stocking density and the highest algal concentration. Both crowding and food limitation had independently negative impacts on the survival, growth and metamorphosis of larvae, and these negative impacts were further strengthened by the interaction of a higher stocking density and a lower algal concentration. Moreover, the results suggest that stocking density and algal concentration obviously played different roles in determining larval survival and growth. To maximize survival and growth, B. formosae habei larvae should be reared at a lower stoking density of 0.25 larvae mL⁻¹ and fed a higher algal concentration of 25 × 10⁴ cells mL⁻¹ in large-scale hatchery seed culture.  相似文献   

织纳煤田主要煤层煤层气资源量及其可采潜力评价     

史科  吴财芳 《山东饲料》2013,(8):5-6

煤层气资源量是地质综合选区评价的重点,资源量计算的准确与否关系到目标区评价的成败。本文以织纳煤田主要煤层为研究对象,在深入分析煤层厚度、含气量等参数特征的基础上,计算了煤层气资源量,并从含气面积、含气量、资源丰度等关键要素入手,对其可采潜力进行了评价。结果表明:织纳煤田的煤层厚度主要呈现从西向东逐渐变小的趋势,煤层总厚最大能达到20.5m,大部分煤层厚度处于0.8-2.0m。含气量在勺窝、岩脚、茶店、白岩几个地区比较高,在3个主采煤层中,含气量分布特征基本一致。研究区煤层气资源量比较丰富,总资源量达到6367.77×108m3。综合"含气面积、含气量、资源丰度、构造复杂程度"等4个关键参数总体进行分析,煤层气勘探开发最有利区位于化乐地区,白岩、乐治南东翼东段、新华、坐拱等区域是煤层气勘探开发的较有利区。  相似文献   

Identification of molecular markers linked to the genes for purple grain color in wheat (<Emphasis Type="Italic">Triticum aestivum</Emphasis>)     

Xing-Pu Li  Su-Que Lan  Ye-Lun Zhang  Yu-Ping Liu 《Genetic Resources and Crop Evolution》2010,57(7):1007-1012

Pericarp color in wheat is an important trait related to nutrients and health benefits. Identification of molecular markers closely linked to the grain color genes will help utilize pericarp trait in wheat breeding. Genetic studies involving F₁, F₂, and F₃ populations from the cross Jizi 439 (purple grain)/Gao8901 (white grain) showed that the purple grain color was controlled by two genes. By using the bulked segregant analysis (BSA) approach, two DNA pools were established from the dark purple-grain and white-grain plants respectively. Among the 230 pairs of microsatellite primers used in this study, two markers showed polymorphism in DNA pools, parents, F₁ and F₂ populations. Linkage analysis indicated that the two markers Xgwm47 and Xgwm155 were linked with two purple pigment genes. One of the purple pigment genes is located on chromosome 2AS and is 34.7cM away from the marker Xgwm47, whereas another gene is mapped on 3AL with 14.7cM away from marker Xgwm155.  相似文献   

C. Clare Hinrichs and Thomas A. Lyson (eds.): Remaking the North American Food System: Strategies for Sustainability     

Molly D. Anderson 《Agriculture and Human Values》2009,26(3):251-252

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不同覆盖措施无公害清除五味子园杂草的试验     

刘士军 《防护林科技》2013,(12):39-40

通过对凤城市郊区北五味子园杂草种群分布情况的调查和实施不同覆盖措施清除杂草试验，结果表明：凤城市郊区五味子园杂草具有鲜明的季节特性和杂草分布不均匀特性，杂草滋生数量较大，对五味子植株生产影响较大；杂草主要通过草籽和串根繁殖；不同覆盖措施间控制杂草的效果差异极显著，以覆双层黑地膜取得的效果最好，杂草比对照减少99．80％。采取双层黑地膜覆盖技术是有效控制五味子园杂草滋生蔓延的最佳措施，能够达到彻底控制杂草的目的。  相似文献   

鲁棉研27号在黄河流域高产栽培要点     

刘春兰  王青利  柴德美 《江西棉花》2011,33(3)

鲁棉研27号是山东省棉花研究中心、中国农业科学院生物技术研究所对鲁613系×GK12的初始系鲁55经多年系统选育而成的品种,是转基因抗虫常规棉,适宜在黄河流域棉区麦田套种.该品种属转基因抗虫常规麦套春棉品种,符合国家棉花品种审定标准并通过审定.  相似文献   

野生稻抗病虫基因的挖掘和利用   总被引：1，自引：0，他引：1  

闫影  王春连  刘丕庆  赵开军 《作物杂志》2011,(4):1-6

本文综合国内外文献,简要介绍了野生稻抗病虫基因发掘、定位、克隆及育种应用研究的进展,讨论了野生稻优异抗病虫基因在水稻育种中的应用前景。  相似文献   

重庆市万州区1年生尾巨桉生长情况调查     

崔涛  刘志勇 《北京农业》2011,(3):108-109

通过对重庆市万州区营造尾巨桉(3229品系)的调查结果表明,该树种在该区域的适应性和速生性较强,可进一步扩大种植范围,在万州区乃至三峡库区具有一定的发展前景。  相似文献   

苗木切根技术研究进展   总被引：5，自引：0，他引：5  

李国雷  刘勇  祝燕 《林业科学》2011,47(9)

精准培育的理念已经渗入到森林培育的各个环节。切根作为干扰根系最为重要的技术,也受到越来越多地重视。切根可以划分为芽苗切根、苗期切根和起苗后切根等3种类型,把平截、扭根、侧方修根、盒式修根等称为苗期切根,是狭义切根范畴。结合苗木形态指标、生理指标和造林效果,综述每一类型的切根对苗木质量和造林效果的影响。以辐射松为代表的主根发达树种,通过芽苗切根、苗期的平截和扭根,抑制根系顶端优势,从而降低苗木高生长,促进侧根发育,形成发达、紧凑的根系,调整苗木地上和地下比例,最终提高苗木造林效果。以花旗松为代表的慢生常绿树种,侧根较为发达,切根效果不一。苗木平截和扭根后,内源激素、矿质营养、碳水化合物、水分等均会发生变化,这种变化如何影响苗木质量的机制尚不明确。  相似文献