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不同浓度生根粉浸泡南荻插茎对其存活及幼苗生长的影响 总被引：1，自引：0，他引：1
为了给南荻大规模繁殖和栽培提供理论依据,以南荻(Miscanthus lutarioriparius)茎秆为材料,通过5种不同浓度的生根粉溶液(0,25,50,100和200 mg·L-1)处理来研究生根粉对南荻扦插的存活率、生长速率以及幼苗生长的影响。研究结果表明:不同浓度生根粉溶液浸泡处理后,南荻茎秆扦插出苗率的变化范围为65.55%~70.00%,各处理浓度之间差异不显著;生根粉溶液对南荻苗初期的纵向生长具有一定的促进作用,高浓度的生根粉处理对苗前期和后期能起到一定的优势,各处理效果随时间不同而不同;南荻叶片的生长速率随时间和生根粉浓度的不同而有所变化,除了对茎粗没有显著影响外,生根粉对南荻茎秆扦插苗的生长速率、出叶率、地上与地下部干重、倒三叶长等都有一定的影响。总的来说,50 mg·L-1处理的各项指标都呈最大值。 相似文献
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益生菌与酶制剂对黄羽肉鸡血液生化指标和免疫性能影响的协同效应研究 总被引：1，自引：0，他引：1
为研究益生菌与酶制剂对黄羽肉鸡血液生理生化指标和免疫功能的影响,试验选择5日龄体重相近的健康雌性黄羽肉鸡675羽,随机分成5个处理,每处理5个重复,每个重复27羽,处理Ⅰ组饲喂基础日粮,处理Ⅱ、Ⅲ、Ⅳ、V组分别在基础日粮中添加25 g/t益生菌制剂、150 g/t复合酶制剂、25 g/t益生菌制剂+150 g/t复合酶制剂、300 g/t抗敌素。结果表明,Ⅳ组多项血液生化及激素指标有不同程度的改善,表现出有优于其他各组的趋势;各处理组胸腺、脾脏、法氏囊指数无统计学差异(P>0.05),组合添加的Ⅳ组血清总蛋白、白蛋白含量最高,球蛋白也处于较高水平,且白球比适宜,血清游离三碘甲腺原氨酸(FT3)浓度空白Ⅰ组及添加益生菌的Ⅱ组显著高于添加抗生素的V组(P<0.05),血清游离甲状腺素(FT4)浓度则反之,V组显著高于空白Ⅰ组和Ⅱ组(P<0.05),Ⅳ组血清FT3、FT4浓度适中,FT3/FT4值Ⅰ、Ⅱ两组一致且明显高于Ⅳ组(P<0.05)和V组(P<0.01)。总体而言,各添加剂处理组对黄羽肉鸡血液生理生化指标及免疫性能方面的作用效果存在差异,但益生菌与酶制剂组合使用表现出了一定的协同优势,且有优于抗生素饲料添加剂的趋势。 相似文献
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为了研究在不同季节各月龄阶段安格斯牛的血液生理与生化指标变化,了解安格斯牛在新疆石河子地区的适应性,该试验分别于冬夏两季,在初生、10月龄、18月龄3个阶段各随机选取50头牛,分别于颈静脉与尾静脉采血进行生理生化指标分析。结果表明:初生阶段,总蛋白含量、血糖浓度、白细胞总数和红细胞数量在冬夏两季差异显著(P<0.05);10月龄阶段,甘油三酯浓度、尿素氮浓度、红细胞数量与白细胞总数在冬夏两季差异显著(P<0.05);18月龄阶段,甘油三酯浓度与白细胞总数在冬夏两季有显著差异(P<0.05);其余指标差异均不显著。安格斯牛对不同气候有相对较好的适应性,但夏季高温可能会影响安格斯牛的生产性能。 相似文献
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为寻找有效、安全的火龙果保鲜方法,探讨了热处理对采后火龙果低温贮藏期保鲜的影响。将采后的果实在46 ℃条件下进行不同的热处理时间(0min、10min、20min),然后于7 ℃条件下贮藏,每隔7d测定呼吸强度、腐烂率、失重率、相对电导率、丙二醛、含水量、可溶性固形物、还原糖、可滴定酸、pH值和Vc含量等生理指标。通过各项生理指标分析,以得到热处理的适宜时间。结果表明,热处理均能抑制贮藏期果实的呼吸强度,延缓腐烂率、失重率、相对电导率、丙二醛和pH值的增加,抑制含水量、可溶性固形物、还原糖、可滴定酸和Vc含量的降低,并且热处理20min的保鲜效果优于10min。因此,热处理20min对低温贮藏期火龙果保鲜效果较好。 相似文献
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为了探究不同保鲜剂处理对火龙果保鲜的影响,以红肉火龙果为试验材料,研究了乙醇、咪鲜胺、二氧化氯处理对火龙果贮藏期生理、营养指标及相关酶活性的影响。结果表明,与对照组相比,三种保鲜剂(乙醇、咪鲜胺、二氧化氯)均能显著地抑制贮藏期果实失重率、腐烂率、丙二醛、相对电导率的增加,延缓可溶性固形物、还原糖、可滴定酸、VC含量的降低,提高POD和SOD酶的活性,延缓果实的衰老的进程。综合比较,二氧化氯的保鲜效果要明显好于乙醇和咪鲜胺,能够显著延缓果实衰老,较好地保持贮藏期果实的品质。因此,二氧化氯保鲜剂对火龙果保鲜效果最好。 相似文献
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为了研究ABA对北方白菜型冬油菜抗寒性的影响,本试验以白菜型冬油菜陇油8号为材料,分别于冬油菜冬前三、五、六、七叶期用10 mg/L的脱落酸(ABA)溶液喷施叶片,以各个时期喷蒸馏水为对照,分析其对越冬率、产量及生理生化指标的影响。结果表明,外源ABA喷施能够显著提高白菜型冬油菜的越冬率和产量,提高保护性酶活性及渗透调节物等生理生化物质含量,且这种作用主要发生在受到低温(-5℃)胁迫以后, ABA处理的越冬率和产量分别较CK增加14.3%, 8.0%;受低温胁迫后的SOD、POD、CAT酶的活性分别较CK提高39.8%, 20.8%,31.0%;SP、SS、Pro含量较CK增加104.5%,120.1%,77.7%,且随喷施时期总体呈先升高后降低的趋势,六叶期喷施效果最佳。同时ABA处理能增强根系活力,降低MDA含量。因此,在北方寒旱区,在白菜型冬油菜冬前六叶期喷施一定浓度的ABA能提高冬油菜的抗寒性。 相似文献
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由于气候的变化,我国羊草分布区受到干旱等环境胁迫,对其生产力的提高有很大影响。本研究采用盆栽人工控水的方法,研究5-氨基乙酰丙酸(ALA)处理缓解羊草干旱胁迫及其与物质积累、相关酶活性、激素变化和转录组的关系。结果表明,干旱显著抑制植株的生长,而适当浓度的ALA可缓解干旱胁迫对植株的不利效应,其中以50 mg·L-1处理效果最好,可提高羊草株高、鲜重,增强根系活力,促进糖、蛋白、氮磷钾等物质积累,减轻干旱胁迫对羊草幼苗造成的伤害,这与ALA调控植株营养代谢相关酶活性、内源激素含量及其比值等生理效应密切相关,也与ALA在分子水平影响相关代谢的基因表达有直接联系。相关机理值得进一步研究。 相似文献
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Kovalik M Thoday KL Evans H Berry J van den Broek AH Mellanby RJ 《Veterinary journal (London, England : 1997)》2012,193(2):439-442
Glucocorticoids (GCs) are a large group of drugs used to treat a range of inflammatory, autoimmune and neoplastic diseases in dogs. Glucocorticoids have been linked to disturbances in calcium metabolism and skeletal disorders in humans, yet their effects at therapeutically effective dosages in dogs with spontaneous diseases are poorly understood. Serum concentrations of calcium, phosphate, vitamin D metabolites and plasma concentrations of parathyroid hormone and ionised calcium together with urinary fractional excretion of calcium and phosphate, were measured in 16 dogs with atopic dermatitis before and 6weeks after standard dosage prednisolone treatment (0.93-1.06mg/kg) every other day after 7days of treatment with the same dosage once daily. The severity of their physical signs, as assessed by the canine atopic dermatitis extent and severity index version 3 (CADESI-03) and the Edinburgh Pruritus Scale (EPS), decreased in all dogs following prednisolone treatment. There was no significant difference in any of the biochemical parameters measured following prednisolone treatment. This study indicates that prednisolone, used at a therapeutically effective dose, has minimal impact on calcium metabolism in dogs with atopic dermatitis. 相似文献
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低温胁迫对墨西哥玉米幼苗抗寒性的影响 总被引：4，自引：1，他引：3
在5和15℃低温胁迫下,对墨西哥玉米Zea mexicana的2种新材料玉米草1号和玉米草2号叶片内部与抗寒性有关的某些生理生化指标在处理6、24、487、2 h后的变化进行了研究。比较了不同低温处理下,不同材料生理指标变化情况,通过变化规律分析2种材料的抗寒性大小。结果表明,从3个生理指标上看,随温度降低,玉米草1号能保持更好的细胞膜完整性和更低的丙二醛含量,并诱导产生更多的脯氨酸,说明玉米草1号比玉米草2号具有更强的耐寒性。 相似文献
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为探索石灰岩地区多年生黑麦草(Lolium perenne)对高钙生长环境的生态适应性,本研究用多年生黑麦草的种子进行萌发试验,通过设置不同温度和不同浓度的氯化钙处理,探究温度和氯化钙对黑麦草种子萌发的影响。结果表明:同一温度下,低浓度(≤1.5%)氯化钙处理的黑麦草种子发芽率、发芽势和发芽指数普遍较高,而高浓度(≥2.0%)的氯化钙对其则有显著抑制作用(P<0.05)。低浓度氯化钙处理时,温度对多年生黑麦草萌发几乎无影响,高浓度氯化钙处理时,15℃/25℃为多年生黑麦草萌发的最适温度。研究结果不仅丰富了黑麦草生态适应性方面的研究,也为石灰岩地区生态恢复、土地利用以及水土保持提供理论依据。 相似文献
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Ramsey IK Tebb A Harris E Evans H Herrtage ME 《The Journal of small animal practice》2005,46(11):531-536
OBJECTIVES: To assess the effect of canine hyperadrenocorticism (HAC) on parathyroid hormone (PTH), phosphate and calcium concentrations. METHODS: PTH concentrations and routine biochemical parameters were measured in 68 dogs with HAC. Ionised calcium was measured in 28 of these dogs. The results obtained were compared with an age- and weight-matched group of 20 hospital patients that did not show signs of HAC. RESULTS: There were significant differences between the PTH, phosphate, alkaline phosphatase, creatinine and albumin concentrations between the two groups. Total and ionised calcium concentrations were not significantly different. Most of the dogs (92 per cent) with HAC had PTH concentrations that were greater than the reference range (10 to 60 pg/ml), and in 23 dogs they were greater than 180 pg/ml. There were significant positive correlations between the PTH and basal cortisol, post-adrenocorticotropic hormone (ACTH) cortisol and alkaline phosphatase concentrations, and also the phosphate and post-ACTH cortisol concentrations. CLINICAL SIGNIFICANCE: Adrenal secondary hyperparathyroidism is a cause of increased PTH concentrations and may be associated with abnormalities in calcium and phosphate metabolism in dogs with HAC. The findings of this study could explain why canine HAC may cause clinical signs such as calcinosis cutis that are associated with altered calcium metabolism. 相似文献
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Marcel Kovalik Richard J. Mellanby Helen Evans Jacqueline Berry Adri H. M. van den Broek Keith L. Thoday 《Veterinary dermatology》2012,23(6):481-e91
Background – Ciclosporin is widely used in the management of canine atopic dermatitis. In humans, ciclosporin therapy has been linked to disturbances in calcium metabolism and resultant skeletal disorders. Objectives – The objective of this study was to assess calcium homeostasis in dogs before and after a 6 week course of once daily oral ciclosporin at the licensed dose (5 mg/kg). Animals – Sixteen client‐owned dogs with spontaneous atopic dermatitis. Methods – Serum concentrations of calcium, phosphate, creatinine, 25‐hydroxyvitamin D, 1,25‐dihyroxyvitamin D and plasma concentrations of ionized calcium and parathyroid hormone (PTH) were measured, together with the urinary fractional excretion of calcium and phosphate. The extent of skin lesions was scored using the Canine Atopic Dermatitis Extent and Severity Index (CADESI)‐03 and the degree of pruritus by the Edinburgh Pruritus Scale prior to and at the end of the study. Results – The CADESI‐03 and the Edinburgh Pruritus Scale scores decreased satisfactorily in all dogs by the end of the study. Plasma PTH concentrations were significantly increased (P = 0.02) following ciclosporin treatment, whereas all other biochemical parameters were not significantly different from their starting values. The increase in PTH was mild in most cases and the proportion of dogs that had a PTH concentration above the reference range was not significantly different following treatment. Conclusions and clinical importance – This study indicates that ciclosporin has minimal impact on calcium metabolism in dogs with atopic dermatitis when used at the licensed and clinically effective dosage for 6 weeks. 相似文献
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SO_2胁迫对桑树部分生理生化特性的影响 总被引：1，自引：0，他引：1
为探究桑树对SO2污染的抗逆机制,以盆栽实生桑苗为试验材料,采用密闭箱静态熏气法研究不同浓度SO2胁迫对桑树主要逆境生理生化特性的影响。桑树叶片中的含硫量随SO2胁迫处理浓度的增加而升高,随着SO2胁迫的加强,桑树叶片逐渐出现坏死,甚至萎蔫。桑树叶片过氧化氢酶(CAT)活性在处理前期随SO2胁迫处理浓度的增加而升高,处理后期当SO2质量浓度达到50 mg/m3之后,又表现出下降的趋势;桑树叶片的超氧化物歧化酶(SOD)活性则随SO2胁迫处理浓度的增加而急剧下降;在较低质量浓度(10、30 mg/m3)SO2胁迫下,桑树叶片的过氧化物酶(POD)活性表现出较大幅度的升高,而较高质量浓度(50 mg/m3)SO2胁迫下则表现出下降的趋势;桑树叶片的叶绿素含量、净光合速率随着SO2胁迫处理浓度的提高表现出减小趋势,脯氨酸、丙二醛(MDA)、可溶性蛋白质的含量则随SO2胁迫处理浓度的提高而增大。试验结果表明,SO2胁迫抑制了桑树保护酶活性,导致植株逆境伤害加剧,叶片产生坏死,降低了光合能力,对桑树生长产生不利影响。 相似文献