小麦抗旱适应性的营养调控研究          下载免费PDF全文

郭金耀  杨晓玲 《中国生态农业学报》2006,14(1):66-67

试验研究新型复合营养调控剂“活力王”对小麦抗旱适应性的影响结果表明,小麦孕穗期叶面喷施1次“活力王”可改变干旱小麦叶片结构,降低其组织细胞水势,使细胞吸水保水能力增强,植株相对含水量及水分利用效率提高,蒸腾作用得以调节,根系生物量增加。使用“活力王”复合营养调控剂可增强小麦代谢活性,提高小麦对干旱环境的适应性。  相似文献   

灭幼脲对粘虫幼虫体内物质代谢的影响   总被引：2，自引：0，他引：2  

王健  龚国玑 《安徽农业大学学报》1996,23(1):8-12

脱皮８ｈ内的粘虫６龄幼虫,用灭幼脲每头０．０４μｇ胃毒处理后１ｄ～４ｄ,体内血糖和整体糖原含量高于对照约１０％～２０％左右,而血液和脂肪体内蛋白质含量则略低于对照,与此相反,处理５ｄ后至初蛹期,粘虫体内血糖和整体糖原含量低于对照３％～２０％,而血液和脂肪体内蛋白质含量却高于对照,７日龄时处理组幼虫脂肪体内蛋白质含量比对照高达３１％。上述现象难以用灭幼脉抑制粘虫几丁质生物合成来解释,可能是其干扰了粘虫激素平衡的结果。同时,灭幼脲时稻瘟病菌孢子萌发有一定抑制作用,但抑制强度远低于异稻瘟净,说明灭幼麻可能对真菌几丁质合成有较弱的抑制。  相似文献   

茶树茶氨酸合成相关酶基因研究     

赵洋  刘振  杨培迪  成杨  杨阳 《江西农业学报》2015,(4)

茶氨酸是茶树特征性非蛋白质氨基酸。阐述了茶氨酸在茶树体内的分布及变化特点,总结了茶氨酸合成途径及茶氨酸合成相关酶基因的研究现状,并对今后的研究内容及方向进行了展望。  相似文献   

Effect of oral administration of l -thyroxine (T₄) on growth performance, digestibility, and nutrient retention in Channa punctatus (Bloch) and Heteropneustes fossilis (Bloch)     

S. K. Garg 《Fish physiology and biochemistry》2007,33(4):347-358

Effects of oral administration of l-thyroxine (T₄) on growth performance, body composition, and some aspects of nutritional physiology were investigated in two slow-growing air-breathing fish (Channa punctatus and Heteropneustes fossilis) under laboratory conditions (LD 12:12 at 25°C). The results indicate that irrespective of the species, fish fed diets containing lower doses of T₄ (up to 50 mg kg⁻¹ of diet in C. punctatus and up to 100 mg kg⁻¹ of diet in H. fossilis) showed significantly (P < 0.05) higher growth (in terms of live weight and length gain, specific growth rate, percentage gain in body weight and condition factor), low feed conversion ratio, high nutrient retention, high apparent protein digestibility, and high digestive enzyme activity. Viscero-somatic (VSI) and hepato-somatic (HSI) values were also high in fish fed on low dietary T₄ levels. Liver glycogen levels decreased with the increase in the dietary T₄ levels, indicating its utilization during growth. Muscle glycogen levels in H. fossilis coincided with high growth at 100 mg of T₄. Observation of the postprandial excretion of metabolites (N–NH₄ ⁺ and o-PO₄ ⁻) indicated significantly (P < 0.05) low levels in aquaria water where the fish were fed diets with low T₄ levels. These studies further revealed that feeding fishes on higher T₄ levels (above 50 mg in C. punctatus and above 100 mg in H. fossilis) not only repressed growth performance and nutrient retention, but also affected carcass composition by lowering protein accumulation (muscle and carcass protein) and energy assimilation. These studies revealed a biphasic action of thyroxine, i.e., the hormone at lower doses is anabolic, while at higher doses it acts as a catabolic agent, indicating that feeding fishes on higher doses can be detrimental to their growth and metabolism. In summary, the results of the present study show that feeding H. fossilis and C. punctatus on low doses of T₄ enhances growth, decreases excretion of metabolites, and increases nitrogen retention. These observations suggest that T₄ supplementation of the diet may have practical utility in the culture of slow-growing fish species.  相似文献   

基于新陈代谢GM（1,1）-Markov链模型的有效灌溉面积预测     

何自立  马孝义  靳国云  甘学涛 《灌溉排水学报》2011,30(4):107-110

采用新陈代谢GM（1,1）模型对全国有效灌溉面积的动态变化进行初次拟合和预测,并根据有效灌溉面积时间序列波动的随机性,利用Markov链模型对新陈代谢GM（1,1）模型的残差进行修正,以概率形式确定出未来全国有效灌溉面积的动态变化区间,并依此模型预测未来10年全国有效灌溉面积的发展趋势。结果表明,该模型预测结果准确可靠...  相似文献   

肉鸭饲养标准研究——3—7周龄仙湖3号瘦肉型鸭能量与蛋白质需要量   总被引：1，自引：0，他引：1  

李焕友  姚武群  田萍  张云琦  朱锦兰  胡文娥  黄德纯  潘杏荷  连槿  尉小平  邓金海 《中国家禽》2001,23(8):38-40

根据代谢试验测得的仙湖3号瘦肉型鸭3-7周龄阶段日粮代谢能水平为11.74MJ/kg，粗蛋白质水平为18.50%。  相似文献   

铁元素在动物组织和体液中的营养研究   总被引：1，自引：0，他引：1  

王自恒  林峰  龚月生 《畜牧兽医杂志》2004,23(3):20-23

本文就微量元素Fe在动物组织和体液中的总量和分布，Fe的代谢，Fe缺乏症，以及动物对Fe的需要量，在动物生产、研究和应用中进行了概述。认为Fe的重要作用和动物的种类、性别、日龄和体重的不同，Fe在机体内的贮量也不同。并详述了Fe的主要营养浓度在动物体内的作用机理。为今后Fe元素的营养研究和应用提供可靠的参考依据。  相似文献   

Blood concentrations of amino acids, glucose and lactate during experimental swine dysentery     

Jonasson R  Essén-Gustavsson B  Jensen-Waern M 《Research in veterinary science》2007,82(3):323-331

The aim of this study was to examine blood concentrations of amino acids, glucose and lactate in association with experimental swine dysentery. Ten pigs (approximately 23kg) were orally inoculated with Brachyspira hyodysenteriae. Eight animals developed muco-haemorrhagic diarrhoea with impaired general appearance, changes in white blood cell counts and increased levels of the acute phase protein Serum Amyolid A. Blood samples were taken before inoculation, during the incubation period, during clinical signs of dysentery and during recovery. Neither plasma glucose nor lactate concentrations changed during the course of swine dysentery, but the serum concentrations of gluconeogenic non-essential amino acids decreased during dysentery. This was mainly due to decreases in alanine, glutamine, serine and tyrosine. Lysine increased during dysentery and at the beginning of the recovery period, and leucine increased during recovery. Glutamine, alanine and tyrosine levels show negative correlations with the numbers of neutrophils and monocytes. In conclusion, swine dysentery altered the blood concentrations of amino acids, but not of glucose or lactate.  相似文献   

巴西橡胶树中2个NADP-苹果酸酶基因的克隆和表达特性分析   总被引：1，自引：0，他引：1  

曹冰  龙翔宇  肖小虎  唐朝荣 《热带作物学报》2014,35(5):872-881

从橡胶树中克隆2个NADP-ME(苹果酸酶)基因的全长cDNA,分别命名为HbNADP-ME1和HbNADP-ME2。HbNADP-ME1和HbNADP-ME2 cDNA全长分别为2 428、2 139 bp,分别编码643、593个氨基酸组成的蛋白,二者的氨基酸序列一致性高达87.25%,且分别与蓖麻和杨树的一个NADP-ME序列具有较高的序列一致性。2个HbNADP-ME蛋白都含有典型的植物NADP-ME蛋白的保守结构域,均富含亮氨酸(Leu),同属于非分泌型稳定蛋白。2个HbNADP-ME基因在橡胶树不同组织中的表达存在明显差异,在根中的表达量最高,种子和花中的表达量次之;另外,HbNADP-ME1基因在胶乳中受机械伤害有下调表达趋势,HbNADP-ME2基因在胶乳中受割胶处理也表现出下调表达趋势,而低温胁迫则显著诱导2个基因在叶片和根中的表达。结果说明,HbNADP-ME基因可能参与橡胶树的抗逆应答及代谢调控(包括胶乳代谢调控)。此结果为深入揭示橡胶树中NADP-ME基因的功能奠定了基础。  相似文献   

有机肥的培肥效应及在烤烟上的作用   总被引：2，自引：0，他引：2  

张联合  郁飞燕  苗艳芳 《安徽农业科学》2007,35(16):4869-4871

概述了有机肥的培肥效应以及有机肥对烤烟生长、代谢、化学成分和品质的影响,提出增施饼肥有利于营养的均衡供应,对烤烟品质形成有重要作用。  相似文献