6-BA在葡萄植株体内的运转和分配   总被引：10，自引：0，他引：10  

张平  黄卫东 《果树学报》2002,19(3):153-157

以葡萄为试材,研究了葡萄根、茎、叶、果等器官对6-苄基腺嘌呤(6-BA)的吸收及它在植株内的运转和分配。结果表明,对1年生葡萄幼苗茎部引入或叶片涂抹6-BA,1h后,在植株所有部位都有分布,其中以茎尖和根部浓度较高,表现为快速、非极性的运输特性。茎部引入5d之内,植株根内6-BA呈持续升高趋势,茎尖内6-BA虽然有波动,但是最后仍达到最大;而叶片涂抹则在涂抹后5h时,全株各部位6-BA浓度达到最大,5d后,除引入叶片外,其它部位几乎测不到6-BA。盛花后30d,果穗浸蘸和穗轴引入6-BA,2h后,果皮、果肉、种子中6-BA浓度达到高峰,以后逐渐下降,果穗浸蘸30d后,果实各部位均已测不到6-BA,穗轴引入30d后,果皮和果肉内仍能测到6-BA,但种子内已测不到。  相似文献   

Impact of Dog Transport on High-Risk Infectious Diseases     

《Veterinary Clinics of North America: Small Animal Practice》2019,49(4):615-627

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复盐胁迫下结缕草K~+、Na~+吸收与运输的特点     

胡化广  张振铭  孙同兴  韩莹莹 《热带作物学报》2016,37(11):2145-2149

用2种中性盐(Na Cl和Na2SO4)模拟江苏沿海滩涂土壤盐碱条件,配制不同复盐浓度,对大穗结缕草(Zoysia macrostachya)和中华结缕草(Zoysia sinica)进行30 d复盐胁迫处理,分别测定根和叶中K~+、Na~+含量,探讨复盐胁迫下2种结缕草K~+、Na~+吸收与运输特点。结果表明:随着盐胁迫浓度的增加,2种结缕草根和叶中Na~+的含量逐渐升高,中华结缕草的Na~+含量大于大穗结缕草;2种结缕草根和叶中K~+的含量呈现不同的变化趋势,根中2种结缕草K~+含量先增加后降低,但大穗结缕草K~+含量增加较大,叶中2种结缕草K~+含量总体呈现增加的趋势。2种结缕草根和叶片中K~+/Na~+随盐浓度增加而逐渐降低,但叶片中K~+/Na~+大于根中K~+/Na~+,表明盐胁迫促进了K~+向叶片运输。大穗结缕草的SK,Na逐渐降低,中华结缕草的SK,Na先降低后升高,说明2种结缕草对K~+和Na~+的选择性运输特点不同。  相似文献   

生物质资源高压连续输送的研究   总被引：1，自引：0，他引：1  

吕秀阳  夏文莉  刘田春  SAKODA Akiyoshi  SUZUKI Motoyuki 《农业机械学报》2001,32(3):27-30

建立了近中试规模的生物质资源高压连续输送装置，通过将生物质资源与水混成浆料的方法实现了生物质资源的高压连续输送、浆料的固含量可达10％（wt)以上，压力可达40MPa，最大浆料供应量为2．4L／h。  相似文献   

18—19世纪中期英国交通运输的建设与农业市场的扩展     

叶明勇 《古今农业》2009,(3):19-28

18世纪中期至19世纪中期英国接连掀起公路、运河和铁路建设的高潮，三者共同形成一个全国性的交通网络，这对于沟通农业与市场的联系起了很大促进作用。农业所需物资及农产品通过发达的交通能迅速便利地交流，大大降低了成本、提高了效率。英国农民对市场反应的灵敏也有赖于此，从某种程度上讲也就刺激了农业生产。另一方面，交通运输网络的形成又促进了市场的扩大与完善，这对于英国农业，对于英国整体经济的发展都有重大的意义。  相似文献   

14C同化物在黄柏韧皮部的运输速率测定     

严晓宇  叶萌  彭煜程  夏先福  赵敏  蒋燕  张岚 《林业科技开发》2007,21(2):60-61

以14C为示踪剂,用14CO2 CO2混合气体法进行半株标记,饲喂50μCi/株的NaH14CO3,标记时间为lh.燃烧法制样,在FJ2107P液体闪烁计数器上测定,14C同化物在黄柏韧皮部中的运输速率为47～54 cm/h,平均速率为50.2 cm/h.  相似文献   

Transportation and handling stress of white suckers raised in cages   总被引：1，自引：0，他引：1  

Janice Bandeen  John F. Leatherland 《Aquaculture International》1997,5(5):385-396

Changes in plasma cortisol concentrations were measured in juvenile white suckers, Catostomus commersoni (Lacepede), as a measure of their response to transportation (8 h) and chase challenge stressors. The study attempted to evaluate the ability of this species to withstand standard aquacultural husbandry practices. Plasma cortisol concentrations were elevated during and following transportation. Recovery from transportation (as plasma cortisol levels reached baseline values) was prolonged in fish transported under winter conditions compared with fish transported during the summer months. The plasma cortisol response to a 5 min chase challenge in well-fed juvenile white suckers was typically of 2 to 3 h periodicity with the peak values between 15 and 30 min. This pattern was similar in fish fed three commercial diets (although rates of recovery differed), and was unaffected by fasting. The return of plasma cortisol concentrations to baseline values following the chase-challenge stressor was prolonged in fasted groups. The results of this study showed that juvenile white suckers require several days to recover from transportation and under the acclimation conditions applied, the recovery was faster in the fish transported during the summer.  相似文献   

鳙鱼初孵鱼苗的运输试验     

钱培良  陆剑林 《水产养殖》1994,(6):17-18

本文作者在１９９２－１９９３年进行了５次鳊鱼初孵鱼苗（出膜后１－２６小时）的运输试验，都获得成功。鳙鱼初孵鱼苗在运输路程１２０公里、运输时间３－４小时的情况下，运输成活率达９５以上。  相似文献   

Efficient management of transportation logistics related to animal disease outbreaks     

H. Vernieuwe  E. Ducheyne 《Computers and Electronics in Agriculture》2010,71(2):148-157

Vehicle routing is a key instrument to manage and control animal disease outbreaks. This paper focuses on an efficient, user-friendly and automatic procedure to manage transportation logistics to and between farms in the case of an outbreak. This procedure can be embedded into a veterinary geographical information system for the management and control of disease outbreaks. The transportation logistics for the problem at hand can be divided into two main transportation categories: (i) round itineraries, which are special cases of the travelling salesman problem, and (ii) one-to-one itineraries. Attention is given to the use of user-friendly, heuristic yet efficient algorithms for the determination of these itineraries. It is furthermore shown that the procedure is developed in such a way that the identified routes meet both national and international regulations in force during disease outbreaks.  相似文献   

杂种小麦生育规律的研究 Ⅰ开花后光合产物的积累及对产量的影响     

蒋纪芸  冯佰利  张保军  杨惠侠 《西北农业学报》1992,1(3):31-36

采用称重法研究了杂种与常规品种开花后顶三叶、鞘、茎节间干物质变化过程的结果表明,杂种小麦营养体内光合产物的生产量具有优势,单茎增长量较常规品种多22%,但由于输往穗子的光合产物比常规品种少10%,因而杂种产量优势不显著。  相似文献