四合木水分代谢特性的初步研究   总被引：3，自引：0，他引：3  

刘果厚  周世权  张力  蔺福金  任林 《干旱区资源与环境》1993,(2)

四合木(Tetraena mongolica Maxim)为内蒙古特有的国家二级保护、内蒙古一级保护植物。本文首次报道了四合木的水分状况(总含水量、自由水含水量及束缚水含水量)和水分代谢(水势、蒸腾速率及抗脱水力),并且讨论了这些特性与忍受干旱的关系,为进一步保护这种植物提供科学依据。  相似文献   

Absorption, translocation, and metabolism of propoxycarbazone-sodium in ALS-inhibitor resistant Bromus tectorum biotypes     

Kee Woong Park 《Pesticide biochemistry and physiology》2004,79(1):18-24

Experiments were conducted to investigate the absorption, translocation, and metabolism of propoxycarbazone-sodium in acetolactate synthase-inhibitor resistant (AR and MR) and susceptible (AS and MS) Bromus tectorum biotypes. Absorption and translocation of ^l4C-propoxycarbazone-sodium were similar in all biotypes. One major and three minor metabolites were identified using reverse-phase high performance liquid chromatography. In all biotypes, 80% of the propoxycarbazone-sodium was metabolized by 72 h after treatment (HAT). However, propoxycarbazone-sodium was metabolized more rapidly in the MR biotype than in the other biotypes. The half-life of propoxycarbazone-sodium in the MR biotype was 8.9 h, which was 30, 36, and 40% shorter than in the AS, AR, and MS biotypes, respectively. When ¹⁴C-propoxycarbazone-sodium was applied with 1-aminobenzotriazole, a known cytochrome P450 inhibitor, metabolism decreased 20% 12 HAT in the MR biotype. These results indicate that resistance of the MR biotype to propoxycarbazone-sodium is due to a relatively rapid rate of propoxycarbazone-sodium metabolism compared to other B. tectorum biotypes and that cytochrome P450s may be involved in the metabolism. The fact that these populations evolved so quickly and with different resistance mechanisms is a concern as more ALS inhibitors are introduced into the production systems.  相似文献   

Carbaryl induced alterations in the reproduction and metabolism of freshwater snail Lymnaea acuminata     

Pankaj Kumar Tripathi 《Pesticide biochemistry and physiology》2004,79(1):1-9

When the freshwater snail Lymnaea acuminata was exposed to sub-lethal doses (2.0, 5.0, and 8.0 mg/L) of carbaryl, fecundity was significantly reduced and even stopped at higher sub-lethal doses and altered metabolic activity in the body tissue of the snail was observed. The change from aerobic to anaerobic metabolism results in lesser energy production in the body tissues of the snails, causing paralysis and finally death. This reduced fecundity and altered metabolism suggests that it would be better to avoid the use of carbaryl pesticides in the water bodies or fields adjoining the water bodies particularly in the rainy season.  相似文献   

Physiological and molecular insight on the mechanisms of resistance to glyphosate in Conyza canadensis (L.) Cronq. biotypes     

G. Dinelli  I. Marotti  M. Minelli  J. Barnes 《Pesticide biochemistry and physiology》2006,86(1):30-41

  相似文献   

日粮氟水平对肉鸡生长的影响及氟中毒简易诊断的研究   总被引：4，自引：1，他引：3  

梁学庆  冯定远 《畜牧兽医学报》1998,29(6):517-522

本试验设５个组,每组３５只艾维茵肉鸡,试验期从１５至４２日龄,第１组为对照组（含氟量为２７～３３ｍｇ／ｋｇ）在第１组的基础上分别添加氟２００,４００,６００,８００ｍｇ／ｋｇ（以氟化钠添加）进行了饲养试验,代谢试验,血液中指标的测定,屠宰试验,Ｘ光检查,病理切片等多种研究手段的研究,结果表明,除加氟２００ｍｇ／ｋｇ,组增重不受影响外,其余各组与对照组相比,增重显著降低（Ｐ〈０．０１）,加氟８００ｍ  相似文献   

稀土元素对鲤鱼肠道发育及消化酶活性的影响   总被引：4，自引：0，他引：4  

江振莹  贾志海  郭云锁  周凤武  刘海涛 《动物营养学报》2007,19(1):86-90

本试验研究稀土元素对鲤鱼(Cyprinus carpio)肠道发育及消化酶活性的影响.选用健康、均重(333.8±18.6)g的1日龄德黄杂交鲤鱼(德国镜鲤×黄河鲤)450尾为试验动物.采用单因子随机分组设计,分为5个处理组,以基础日粮为对照组,基础日粮中添加100、200、300和400 mg/kg的硝酸稀土为试验组,每个处理组设2个重复,每个重复45尾试验鱼,试验期60 d.结果表明:饲料中添加200～300 mg/kg硝酸稀土可提高鲤鱼肠道胰蛋白酶、糜蛋白酶和脂肪酶的活性,分别提高29.9%(P＜0.01)、56.3%(P＜0.05)和32.8%(P＜0.05),促进鲤鱼生长,较对照组提高21.0%(P＜0.01),降低鲤鱼饵料系数15.0%(P＜0.05).本试验在饲料中添加适量的硝酸稀土能提高鲤鱼肠道中胰蛋白酶、糜蛋白酶和脂肪酶的活性;促进鲤鱼对饲料的消化吸收,提高鲤鱼的增重;过量的硝酸稀土抑制肠道胰蛋白酶、糜蛋白酶和脂肪酶的活性;硝酸稀土对鲤鱼肠体之比没有显著影响.  相似文献   

酸铝对杉木磷吸收和代谢的影响   总被引：6，自引：0，他引：6  

杨婉身  陈惠  王晓丽  张健  罗承德 《林业科学》2000,36(3):73-76

用＾３２Ｐ示踪原子法通过水培试验研究了酸性条件下铝对１年生杉木的根和叶磷吸收和代谢的影响。结果表明,在ｐＨ＝３时,用酸铝处理根和叶后,根中＾３２Ｐ－无机磷增加到对照的１９５％,叶片＾３２Ｐ－无机磷转运指数由４３．０降低到２０．０。根的Ｐ总含量中的各＾３２Ｐ－化俣物比例发生较大变化,无机磷增加到对照的１７５％,有机化合物,脂类化合物,ＤＮＡ,ＲＮＡ分别减少到对照的５５％,４２％,３６％,４０％;叶中  相似文献   

ORGANIC SUBSTANCE METABOLISM DURING SEED GERMINATION OF PINUS BUNGEANA     

Shang JieNortheast Agricultural UniversityZhao KentianNortheast Forestry University 《林业研究》1993,(2)

The metabolism of fats,proteins and carbohydrates and change of enzyme ofseeds of pinus bungeana during the germination were conducted by the methods of gas-—liquid chromatography,flow injection,colorimetric analysis of spectrophotometer,toprovide theoretical basis for seeds dormancy,germination and storage of seeds of foresttree.The results indicate that(1)carbohydrates were first utilized during germination ofseed of pinus bungeana;(2)stored substances in seeds began to decompose quickly afterradicale broke through seed coats;(3)the activity of enzymes in the seeds does not alwayscoincides with the increase or decrease in quantity of its responsible substance duringgermination of the seed.Changes in stored substance relate to metabalism of othermetabolism of other materials and the use of hydrolysates.  相似文献   

不同脱乙酰度壳聚糖对金针菇菌丝体生长代谢的影响   总被引：2，自引：0，他引：2  

吴智艳  闫训友 《北方园艺》2007,(5):232-234

壳聚糖是甲壳素经脱乙酰基而得到的高分子阳离子聚合物,具有特殊的分子结构与功能,在科研及应用领域越来越受到人们的重视.以金针菇为材料,研究在不同脱乙酰度(80%、90%、95%)、不同浓度(0.125、0.083、0.063、0.05 mg/mL)的壳聚糖的条件下对菌丝体生理生化的影响,结果表明:3种脱乙酰度壳聚糖分别在不同的浓度下,对金针菇菌丝体生长量、蛋白质含量、核酸含量都有明显的促进作用,但随壳聚糖脱乙酰度及稀释倍数不同而有所不同.其中以脱乙酰度为90%,浓度为0.083mg/mL时,促进作用最为明显;但3种不同脱乙酰度不同稀释倍数的壳聚糖对可溶性糖的影响作用表现不明显.  相似文献   

莲藕田间越冬过程中碳水化合物代谢的研究   总被引：3，自引：0，他引：3  

李良俊  张晓冬  谢科  孙磊  顾丽  曹碚生 《中国蔬菜》2006,1(4):11-13

对莲藕田间越冬过程中淀粉(包括直链淀粉、支链淀粉)、葡萄糖、果糖、蔗糖的含量变化进行了研究。结果表明:莲藕成熟期根状茎贮藏物质以淀粉为主,其中武植2号含量最高,达12.8%,鄂莲1号最低,为11.2%。从成熟期至11月30日碳水化合物含量基本不变;11月30日~翌年1月30日,19.6%~26.4%的淀粉被分解,葡萄糖、果糖含量增加,且部分转化成蔗糖积累;1月30日~3月30日,根状茎中碳水化合物含量基本未变;3月30日~4月30日,根状茎中18.7%~33.9%的淀粉再次被分解,葡萄糖、果糖含量显著升高。整个越冬过程中支链淀粉的分解多于直链淀粉。  相似文献