Photosynthate Unloading from Seed Coats of Phaseolus vulgaris L. an Attempt to Define Conditions Required for Stimulation by Abscisic Acid and Benzylamino Purine     

John W.PATRICK 《浙江大学学报(农业与生命科学版)》1990,(4)

The instablity of the stimulation of photosynthate unloading from seed coats of Phaseolus vulgaris by abscisic acid (ABA ) and benzylamino purine ( BAP ) was studied in terms of experimental conditions. ABA stimulated photosynthate unloading at pH 6 and pH 8 without close dependence upon pH. ABA at a concentration range of 10-5-10-4 mol/L displayed stimulatory effect. However, BAP revealed no effect at a concentration range of 10-6-10-4 mol/L. Experiments designed with different transport time of 14C-photosynthate indicated that ABA might act at the plasma membrane of the unloading cells. Reducing endogenous ABA level by diminishing leaf area did not facilitate the manifestation of exogenous ABA function. Potassium ion stimulated photosynthate unloading from seed coats with highest promotion at 100 mmol/L K . However, no dependence of ABA stimulation of photosynthate unloading on K was found.  相似文献   

Genetic Engineering Approaches to Pig Production*     

B. Brenig  G. Brem 《Reproduction in domestic animals》1991,26(1):14-21

Modern biotechnology promises a number of new applications in animal breeding and production. Although conventional pig breeding has achieved a high level of efficiency and productivity numerous problems have been encountered with animal health and the loss of meat quality. Selection based on phenotypic performance data of individual animals does not take into account the importance of specific genes and their relevance within a complex regulatory system. In most cases it is therefore difficult to trace back the genetic origins of clinically important disorders. The application of genetic engineering techniques in pig production will facilitate diagnosis, improvement of productivity, and animal health by allowing direct genetic manipulation. Attention must be focussed on the physical and genetic analysis of the procine genome. The isolation and characterisation of genes, DNA-markers, polymorphic DNA-fragments, and their chromosomal assignment will be important prerequisites and tools for the elucidation of genetic disorders. Especially the detection of heterozygous carriers of recessive disorders and their elimination from the breeding stock will increase selection accuracy and decrease the generation intervals. But also the rapid and simple detection of infectious diseases, which is sometimes difficult if not impossible at present, will improve animal health and welfare. Although the production of transgenic animals either by DNA-microinjection into zygotes or the use of embryonal stem cells manipulated in vitro is less straightforward than DNA-based diagnosis it will play an important role in the direct manipulation of the porcine genome and genes. Breeding programmes including the use of transgenic livestock have already been developed. There is no doubt that genetic engineering has reached a degree of practical feasibility, allowing it to play an important role in pig breeding in particular and animal production in general.  相似文献   

草酸芳酯型液晶物质的合成     

梅焕谋 《湖南农业大学学报(自然科学版)》1991,18(4)

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Salinity stress responses of a sterile mutant of Ulva pertusa (Ulvales, Chlorophyta)     

Makoto  KAKINUMA  Yoshinao  KUNO  Hideomi  AMANO 《Fisheries Science》2004,70(6):1177-1179

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绵羊实验性乳酸酸中毒研究——Ⅲ.肾功能和尿液的改变     

龚伟  刘志尧  王哲  李毓义 《中国兽医学报》1992,(3)

将12只2～3岁健康绵羊分为Ⅰ组(3只)、Ⅱ组(6只)和Ⅲ组(3只),分别按2.5,5.0,10.0 g/kg体重的剂量,向瘤胃内注入50%D—L消旋体乳酸溶液,各处理组均出现酸中毒症状.乳酸酸中毒时,肾脏的损伤程度与瘤胃内注入乳酸的剂量水平有关.各处理组瘤胃内注入乳酸后,尿素氮显著升高.第Ⅰ组尿液pH下降迅速,恢复亦快;第Ⅱ组尿液pH下降和回升均较缓慢,而且出现大量蛋白质和血液;第Ⅲ组尿液除见第Ⅰ、Ⅱ组的变化外,还出现肌红蛋白、酮体和尿胆素原.  相似文献   

人工培育牛黄对小白鼠离体小肠运动的解痉作用     

贺春阳  关红 《内蒙古农业大学学报(自然科学版)》1989,10(1):31-36

本文证明培育牛黄对乙酰胆硷与氯化钡所引起的小白鼠离体小肠痉挛有解痉作用。培育牛黄的成份中去氧胆酸具有较强的抗乙酰胆硷与氯化钡作用,其浓度与效应呈直线相关。其成分中的胆酸仅有较弱的抗乙酰胆硷作用,且浓度与效应不呈直线相关,也无抗氯化钡作用。  相似文献   

苹果酸处理水稻种子对秧苗根系及抗寒性影响的初探   总被引：1，自引：0，他引：1  

楼锡元  徐伟亮  吴河元 《种子》1993,(2)

水稻种子经苹果酸处理后,淀粉酶过氧化氢酶和脱氢酶活性均有提高。其幼苗根系发达,根/茎叶比重增加。幼苗经5C冷处理后,超氧化物歧化酶活性和叶绿素含量虽表现出下降,但明显高于对照。丙二醛含量和电解质渗漏率比对照为低。苹果酸处理在一定程度上提高了水稻秧苗素质及抗寒能力。  相似文献   

猪雌激素受体基因研究进展   总被引：2，自引：0，他引：2  

毛永江  丁家桐 《黑龙江动物繁殖》2003,11(3):17-20

雌激素受体(ESR)是一种核酸受体，具有转录调控蛋白质的功能，影响着雌激素基因在雌性脊椎动物组织的表达，从而对第二性征、繁殖周期、生殖力、妊娠维持等方面产生影响。本文对雌激素受体的分布、生物学作用、分子结构、基因定位、多态性及其与猪繁殖性能的关系等方面作一综述。  相似文献   

不同喂养条件和营养强化对大型Sou总脂及脂肪酸组成的影响          下载免费PDF全文

黄显清  王武等 《上海海洋大学学报》2001,(1):49-54

大型Sou的总脂和脂肪酸组成随食物的变化及营养强化的实施而发生显著变化。酵母组总脂为2．5％，明显高于海水小球藻组（1．65％）和有机肥组（1．5％）。经鱼油强化或海水小球藻二次培养后脂类含量明显升高。三组中酵母组的MUFA含量是高为55％。主要是C16：1ω9（23％），而PUFA最低（16．6％），其中EPA（2．7％）、DHA（0．8％）等ω3HUFA含量均很低；与酵母组相比，海水小球藻组和有机肥组的MUFA含量显著下降，PUFA含量显著升高，均为30％－33％左右，三组中海水小球藻组EPA含量最高（14％），其次是有机肥组（5．9％）和酵母组（2．7％）；有机肥组DHA含量最高，达11．7％，而酵母组和海水小球藻组DHA含量均低，仅为0．7％－0．8％。经鱼油强化后，酵母组的MUFA含量显著下降，PUFA显著升高，EPA由2．7％提高到10％左右，DHA由0．8％以7％；酵母组经海水小球藻二次培养后MUFA显著降低，PUFA相应升高，EPA由2．7％提高到9．7％，而DHA含量无变化。  相似文献   

脱毒桐籽饼(粕)蛋白质及能量营养价值评价   总被引：2，自引：0，他引：2  

李铁军  陈孝珊  贺建华  刘庆华 《动物营养学报》2001,13(4):44-49

选用8头30kg的阉公猪和6只1.7kg的伊莎褐公鸡分别对3种脱毒桐籽饼(粕)Ⅰ、Ⅱ和Ⅲ的蛋白质、氨基酸消化率、代谢率进行了测定。结果表明 :3种脱毒桐饼(粕)Ⅰ、Ⅱ和Ⅲ的蛋白质含量分别为31.17 %、35.12 %和23.98 % ;总氨基酸含量为226.93mg/g、278.38mg/g和178.71mg/g,其中赖氨酸含量4.14mg/g、5.01mg/g和3.47mg/g ,蛋氨酸含量为1.24mg/g、1.33mg/g和0.92mg/g ;能量(GE)为17.72kJ/g、16.42kJ/g 和18.02kJ/g。脱毒桐粕Ⅰ的蛋白质消化率为75.15 % ,消化能为12.85MJ/kg;脱毒桐饼(粕)Ⅰ、Ⅱ的表观代谢能分别为4.88MJ/kg 和6.29MJ/kg,真代谢能为5.53MJ/kg 与6.94MJ/kg。3种脱毒桐饼(粕)的氨基酸之间存在不平衡状况 ,从限制性氨基酸的角度来看 ,脱毒桐饼(粕)的第一限制性氨基酸是蛋氨酸、第二限制性氨基酸为赖氨酸。  相似文献