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1.
为了明确钴对NaCl胁迫的缓解作用,本研究就CoCl2对不同浓度NaCl胁迫下大麦种子的萌发、幼苗生长及内源激素与相关生理指标的影响进行了探讨。结果表明,随着NaCl胁迫程度的加重,大麦种子发芽势、发芽率显著降低,芽与根的生长受到显著抑制。幼苗脱落酸(ABA)与丙二醛(MDA)大量积累,抗氧化酶活性提高。加入0.1mmol/LCoCl2显著提高了NaCl胁迫下大麦种子的发芽势与发芽率,促进了芽与根的生长,抑制了幼苗ABA的积累,同时提高了抗氧化酶活性,降低了MDA 的含量,且在较严重NaCl胁迫下作用更明显。CoCl2提高了NaCl胁迫下幼苗(IAA+GA3)/ABA 的值,减缓了活性氧(ROS)的积累与膜脂过氧化进程,对种子萌发及幼苗生长起到了促进作用,在一定程度上提高了大麦幼苗对NaCl胁迫的适应能力。 相似文献
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盐胁迫是影响植物生长、发育以至产量的重要因素,试验通过对碱地风毛菊苗期分别以NaCl和Na2CO3 进行胁迫,Na+ 浓度为0(CK),60,120,180,240,300,360 mmol/L,测定其丙二醛、PM-ATPase活性及5′-AMPase活性,以探讨盐胁迫对其膜系统的影响及其苗期耐盐性。结果表明,盐胁迫下,碱地风毛菊丙二醛含量增大,Na2CO3胁迫下,碱地风毛菊根系和叶片中MDA 含量在Na+ 浓度为360 mmol/L 时达到最大值,分别为对照的2.15 和1.94倍;在NaCl胁迫下,碱地风毛菊叶片中MDA 含量最大为对照的1.22倍。同一盐胁迫下,碱地风毛菊根系中PM-ATPase活性和5′-AMPase活性显著高于叶片(P<0.05),碱地风毛菊根系中PM-ATPase活性最大为56.29μg磷酸/(mg蛋白·h),而5′-AMPase活性最大为53.91μg磷酸/(mg蛋白·h)。2种盐胁迫下PM-ATPase和5′-AMPase活性差异显著。总之,盐胁迫下,碱地风毛菊根系比叶片受到的损害小,碱地风毛菊更耐NaCl胁迫。 相似文献
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GsCRCK 基因是参与胁迫早期应答的钙/钙调素调控的受体类蛋白激酶基因,研究发现GsCRCK 正向调控拟
南芥对NaCl和ABA 胁迫的耐性,将耐盐蛋白激酶基因犌狊犆犚犆犓转化苜蓿,对于增强苜蓿的耐盐性具有重要的现
实意义。本研究采用农杆菌介导法将其转入农菁1号苜蓿,获得大量抗性植株。经PCR 和RT-PCR 检测证明
GsCRCK 基因已整合到农菁1号苜蓿基因组中并在转基因植株中转录表达。对获得的2 个转基因株系进行耐盐
性分析,在300mmol/LNaCl条件下进行胁迫处理,测定处理0,3,6,9,12,15d后的质膜透性、丙二醛(MDA)和叶
绿素(Chl)含量,以及胁迫15d时的SOD 活性;并统计400 mmol/L NaCl处理15d时各株系的死亡率。结果显
示,300mmol/L 高盐胁迫15d后转基因苜蓿仍能正常生长,而野生型苜蓿则遭受盐害严重;转基因苜蓿的相对电
导率极显著低于野生型,MDA 含量也显著低于野生型,而Chl含量和SOD 活性都显著高于野生型;在400
mmol/LNaCl处理下,2个转基因株系的死亡率分别为13.33%和10.00%,明显低于野生型植株(63.33%)。表明
GsCRCK 基因的导入提高了转基因苜蓿的耐盐性。 相似文献
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随着全球变化,土壤次生盐渍化日益加重,直接影响到植物的生长发育。高羊茅是重要草坪绿化植物,如何提高其耐盐性是当前亟待解决的问题之一。本研究旨在前期试验的基础上,评价丛枝菌根(arbuscularmycorrhizal,AM)真菌改善高羊茅耐盐性的效应,探索AM真菌增强高羊茅耐盐性的作用机制。在盆栽条件下,对高羊茅接种摩西球囊霉并用不同浓度NaCl(0%,0.8%,1.2% 和1.6%)溶液进行处理。结果表明,接种摩西球囊霉能增加高羊茅叶片抗氧化酶(SOD、POD 和CAT)活性和抗氧化剂(抗坏血酸)含量、渗透调节物质(可溶性糖和脯氨酸)含量、矿质元素(N、P、S、Zn、K、Ca和Mg)含量、K/Na、Mg/Na、Ca/Na和植物内源激素脱落酸(ABA)、细胞分裂素(IPA)、吲哚乙酸(IAA)和赤霉素(GA)含量;降低丙二醛(MDA)、Na+、Cl-含量和膜透性。认为AM真菌能通过增强植物抗氧化系统的反应,降低氧化胁迫造成的伤害,减缓Na+ 和Cl- 毒害,改善养分的吸收,强化渗透调节作用,维持激素平衡等来提高其耐盐能力。 相似文献
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的响应 总被引:1,自引:0,他引:1
以蚕豆品种临蚕2号为试验材料,采用土培法,研究了在镉胁迫期间蚕豆幼苗抗氧化酶(SOD、CAT 和POD)活性、脯氨酸、丙二醛和活性氧含量的动态变化过程,以探讨外源NO 和H2O2 对镉毒害下蚕豆幼苗的保护效应。结果表明,0.1mmol/LSNP(外源NO 供体)和0.01mmol/L H2O2 单独处理均可缓解0.1mmol/L 镉对蚕豆幼苗的氧化损伤,而二者互作处理存在正协同效应,主要表现在增强了蚕豆幼苗的保护酶活性,其中SOD 在镉胁迫72h后活性达到峰值,比对照提高57.89%,CAT 和POD 均在镉胁迫48h 后活性达到最大值,分别比对照提高69.60%和101.18%;镉胁迫120h时,与单镉胁迫处理相比,互作处理的脯氨酸含量提高了134.88%,而MDA 含量、内源H2O2 含量和体内O2· - 的产生速率下降,有效地增强了蚕豆幼苗在镉胁迫期间的抗氧化能力。 相似文献
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以香水百合为试验材料,采用四因素四水平L16(44)正交设计方法,研究了6-苄基氨基嘌呤(6-BA)、赤霉素(GA3)、吲哚丁酸(IBA)3种植物生长调节剂的不同浓度及不同浸球时间对香水百合光合色素及相关酶活性的影响。结果表明,不同时期,各处理叶绿素a、叶绿素b、叶绿素a+b的含量均高于对照,且与对照差异显著,呈先上升后下降的趋势,在现蕾期或初花期达到最大值,GA3150 mg/L、IBA40 mg/L、6-BA60 mg/L、浸球40 min时叶绿素含量最高。超氧化物歧化酶(SOD)、过氧化氢酶(CAT)的活性增强,GA3 150 mg/L、IBA40 mg/L、6-BA60mg/L、浸球40min时二者均维持在较高水平。丙二醛(MDA)的含量低于对照,且上升趋势减缓,GA3100~150mg/L、IBA40~60mg/L、6-BA60mg/L、浸球10~40min时MDA 含量最低。综合分析表明,在所有处理中,以150mg/LGA3+40mg/LIBA+60mg/L6-BA 组合和40min浸球处理的合理搭配效应为最佳。 相似文献
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镉胁迫下蚕豆幼苗抗氧化能力对外源NO和H2O2 的响应 总被引:2,自引:2,他引:0
以蚕豆品种临蚕2号为试验材料,采用土培法,研究了在镉胁迫期间蚕豆幼苗抗氧化酶(SOD、CAT 和POD)活性、脯氨酸、丙二醛和活性氧含量的动态变化过程,以探讨外源NO 和H2O2 对镉毒害下蚕豆幼苗的保护效应。结果表明,0.1mmol/LSNP(外源NO 供体)和0.01mmol/L H2O2 单独处理均可缓解0.1mmol/L 镉对蚕豆幼苗的氧化损伤,而二者互作处理存在正协同效应,主要表现在增强了蚕豆幼苗的保护酶活性,其中SOD 在镉胁迫72h后活性达到峰值,比对照提高57.89%,CAT 和POD 均在镉胁迫48h 后活性达到最大值,分别比对照提高69.60%和101.18%;镉胁迫120h时,与单镉胁迫处理相比,互作处理的脯氨酸含量提高了134.88%,而MDA 含量、内源H2O2 含量和体内O2· - 的产生速率下降,有效地增强了蚕豆幼苗在镉胁迫期间的抗氧化能力。 相似文献
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信号分子H2O2 调节抗氧化系统提高高羊茅耐热性研究 总被引:1,自引:1,他引:0
采用盆栽试验,利用10mmol/L 的H2O2 对冷季型草坪草高羊茅进行叶面喷施处理,研究外源低浓度H2O2对高羊茅叶片中抗氧化系统的调控作用及其对高羊茅抗热性的影响。结果表明,H2O2 可能作为信号分子预先增加抗氧化酶的活性,改变抗氧化剂的浓度,从而减轻随后发生的热胁迫对草坪草造成的氧化伤害;在胁迫过程中POD 和CAT 活性在H2O2 预处理后增加不显著,热胁迫本身增加了POD 的活性,但是降低了CAT 活性,POD 对于提高高羊茅的耐热性可能具有更重要的作用;外源H2O2 显著影响了高羊茅叶片中的AsA-GSH 循环,其中处理植株中的APX、GPX 和GR 的活性在热胁迫过程中增加20% ~110%,GSH/GSSG 下降了80%,与高羊茅抗热性的提高密切相关。可见信号分子H2O2 可以通过调控高羊茅的抗氧化系统提高其抗热性。 相似文献
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盐胁迫下VA菌根真菌对无芒雀麦体内矿质元素含量及组成的影响 总被引:22,自引:1,他引:21
盆栽条件下研究了不同NaCl水平、VAM真菌对无芒雀麦(Bromusinermis)生长和矿质元素吸收的影响。结果表明:在土壤中加入NaCl量为0、1、2、3g/kg条件下,随着NaCl水平提高,植株生物产量降低。在同一NaCl水平下,接种VAM真菌处理的生物产量显著高于对照;而且随着NaCl水平提高,无芒雀麦对VAM真菌的依赖性也呈增加趋势,说明盐胁迫下VAM真菌对无芒雀麦生长的促进作用增大。与不接种处理相比,在NaCl胁迫下接种VAM真菌根处理的植株磷含量提高,钠含量和Na/K、Na/Ca、Na/P、Cl/P元素间的含量比例降低;在NaCl水平较高时(大于2g/kg)接种VAM真菌还显著增加了植株体内N和K的含量。上述结果说明,VAM真菌提高无芒雀麦耐盐性的原因与其改善植株营养条件(如N、P等)、降低Na、Cl在植株体内的相对含量有关。 相似文献
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青海省三角城种羊场绵羊体内的矿物元素检测 总被引:6,自引:1,他引:5
青海省三角城种羊场绵羊块Na,Se,P,Cu和I。夏季泌母羊唾液Na:K=4.4:1,粪Na浓度510mg/kgDM。多数季节血浆P2为0.80-1.16mmol/L,血浆Cu浓度为5.82mmol/L,Cu:Mo〈2:1。乳汁I一低于临界值。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献