BDE3胁迫对翡翠贻贝（Perna viridis）SOD、MDA和GSH的影响

采用半静态试验方法,研究不同质量浓度的一溴联苯醚（BDE3）（1 μg·L-1、10 μg·L-1和100 μg·L-1）胁迫1 d、3 d、7d和15 d且清洁海水释放3 d和7 d后,翡翠贻贝（Perna viridis）外套膜和内脏团超氧化物歧化酶（SOD）活性、丙二醛（MDA）质量摩尔浓度和谷胱甘肽（GSH）质量分数的变化规律。结果表明,BDE3胁迫后低浓度组翡翠贻贝两组织SOD活性均受到诱导（P〈0.01）,诱导率随胁迫时间延长而下降,中、高浓度组外套膜对BDE3响应比内脏团灵敏;BDE3对翡翠贻贝外套膜b（MDA）的影响总体呈诱导后抑制趋势,对内脏团b（MDA）的影响表现抑制-诱导反复变化,其中低浓度组第3天时诱导率最高（26.04%）,高浓度组第7天时抑制率最高（14.92%）;翡翠贻贝外套膜w（GSH）在（BDE3）迫下,低浓度组一直被诱导（P〈0.01）,中、高浓度组总体呈诱导后抑制作用,内脏团中高浓度组w（GSH）胁迫第1天受到显著抑制（P〈0.05）,随暴露时间的延长,低浓度组w（GSH）显著增加（P〈0.01）,中、高浓度组出现诱导抑制的不规律变化。释放阶段结束后仅个别浓度组恢复至对照组水平。     

海南胡椒属植物抗寒性评价

对10种海南胡椒属植物叶片进行-3,-5,-7℃低温处理后,采用电导仪法和硫代巴比妥酸法,分别测定低温低温胁迫对海南胡椒属植物叶片的相对电导率和丙二醛含量的影响,同时对其抗寒性进行评价。结果表明：蒌叶、山蒌、大叶蒟、复毛胡椒抗寒性较强,而大叶种胡椒和海南蒟的抗寒能力较弱。     

三种观叶植物吸收甲醛效果的研究

采用熏蒸法测试3种观叶植物绿萝、白鹤芋,孔雀竹芋吸收甲醛的能力,并通过对3种观叶植物叶片中叶绿素和丙二醛含量的测定,研究其对甲醛的抗性。结果表明：12h3种观叶植物吸收甲醛和抗甲醛综合效果最好的是白鹤芋;植物在吸收甲醛过程中叶片、根系及盆土都发挥着一定的作用,其中叶片发挥主要作用.     

Oxidative stress indicators as selection tools for salt tolerance

Oxidative stress indicators, malondialdehyde (MDA) accumulation and chlorophyll retention, were tested as tools for salt‐tolerance screening in Chloris gayana (Kunth), a forage grass exhibiting inter‐ and intra‐cultivar variability in the response to salt stress. Three types of experimental system were compared, salt shock, gradual salt treatment and leaf segments floated on control and saline solutions. Results followed the same trend in the three systems, but leaf segments or gradually salinized plants are the most convenient. Lower mean MDA and higher mean chlorophyll content were found under salinity in cv. ‘Katambora’, which is considered, from previous field trials, to be more salt tolerant than cv. ‘Boma’. Nevertheless, chlorophyll content did not give consistent results in other tests and it is not recommended for selection purposes. Within cv. ‘Boma’, clones rating higher in a salt tolerance evaluation under greenhouse conditions had lower MDA content under salinity and lower mean MDA ratios between salt‐treated and control samples. The survival of 80‘Boma’ plants under increasing NaCl concentration was assessed and MDA was measured in the leaves of very plant before the final NaCl level was reached, to assess whether it was predictive of survival capability. MDA values were significantly lower in the group surviving longer, thus, a selection based on low MDA values would have enriched the original population with more tolerant individuals.     

黄萎菌诱导棉花活性氧及保护酶系的变化研究

以棉花耐黄萎病品种中棉41和感黄萎病品种冀棉11为材料,通过测定黄萎菌诱导前后活性氧积累及保护酶系活性的变化,研究其与棉花抗性的关系。结果表明:在接种黄萎菌后36h,2个品种的棉花叶片O2-产生速率均达到高峰,而中棉41O2-产生速率明显高于冀棉11;同时,叶片内丙二醛(MDA)的含量也均达到一个高峰,中棉41中MDA含量高于冀棉11;在接种后24h和36h,冀棉11和中棉41棉花叶片中超氧化物歧化酶(SOD)活性分别达到一个高峰,且冀棉11变化幅度大于中棉41;对于过氧化物酶(POD)的活性,在接种后24h,2个品种均达到一个高峰,但是耐病品种中POD活性增加幅度不及感病品种。在棉花与黄萎病菌互作的过程中,活性氧和保护酶系参与不同的抗性反应途径。     

3种盐胁迫对蓟幼苗生长及生理生化的影响

采用盆栽试验研究不同浓度(0.1%、0.2%、0.3%、0.4%、0.5%、0.6%)的NaCl、Na_2SO_4、Na_2CO_3对蓟(Cirsium japonicum)幼苗苗高、叶片相对含水量、丙二醛(MDA)、抗氧化酶(POD、SOD、CAT)以及渗透调节物质(可溶性糖、游离脯氨酸)的影响。结果表明,除0.1%NaCl处理蓟苗高和叶片相对含水量高于无盐胁迫(CK)外,其余处理均低于CK,且随盐浓度增加而降低,其中,0.3%NaCl、0.4%Na_2SO_4和0.1%Na_2CO_3处理下苗高依次为CK的62.15%、58.00%和45.77%,而0.5%Na_2CO_3处理幼苗死亡;随盐处理浓度增加和处理时间延长,叶片中丙二醛含量均呈上升趋势;POD、SOD、CAT活性随盐浓度、时间变化的趋势不尽一致,3种酶活性均出现了阈值,POD出现在0.3%NaCl、0.3%Na_2SO_4、0.4%Na_2CO_3胁迫5d,SOD出现在0.3%NaCl处理3d、0.5%Na_2SO_4处理1d、0.4%Na_2CO_3处理3d,CAT出现在0.3%NaCl、0.2%Na_2SO_4、0.1%Na_2CO_3胁迫3d;相同处理时间下,随盐浓度的增加,除NaCl胁迫下游离脯氨酸(Pro)含量先增后减外,Na_2SO_4和Na_2CO_3胁迫下游离脯氨酸含量,以及3种盐胁迫下可溶性糖(SS)含量均逐渐增加。综上认为,蓟对NaCl、Na_2SO_4、Na2CO4这3种盐均具有一定的耐性,可以在低于0.3%NaCl、0.4%Na_2SO_4和0.1%Na_2CO_3条件下生存和生长。     

入侵杂草曼陀罗对作物化感机理的初步研究

通过室内培养皿法研究了曼陀罗叶水浸提液对油菜、辣椒和苋菜一些生理生化的化感影响.结果表明,曼陀罗浸提液对作物动苗SOD活性有低促高抑的作用.曼陀罗浸提液抑制油菜幼苗POD活性,而提高辣椒和苋菜POD活性.同时,浸提液提高了3种作物幼苗MDA含量.低质量浓度曼陀罗浸提液提高了苋菜和辣椒根系活力,而各质量浓度的曼陀罗浸提液...     

Predictive models of drought tolerance indices based on physiological,morphological and biochemical markers for the selection of cotton (Gossypium hirsutum L.) varieties

The use of tolerant crop varieties is a strategy that mitigates the water deficit effect in a sustainable way.The generation of these varieties is more efficient when variables associated with this tolerance have been identified,since they can facilitate the breeding processes.This study aimed to establish the relationships between water deficit tolerance of four cotton varieties(Nevada-123,Oasis-129,Guatapuri,and Festivalle) and morphological variables(monopodial branches,boll weight,root/shoot...     

新疆不同沙棘品种的抗寒性比较

【目的】研究低温处理对沙棘品种抗寒性的影响,筛选出抗寒能力强品种,为新疆沙棘栽培品种的选择与种植提供可靠依据。【方法】以新疆青河县4个沙棘品种辽阜、阿尔泰新闻、楚依、阿列伊的一年生枝条为材料,分析10 ~-40℃ 条件下沙棘枝条自由水/束缚水比值、电导率、丙二醛含量、可溶性糖和可溶性蛋白含量的变化。【结果】在-20℃以下,4个品种沙棘枝条中自由水/束缚水比值、电导率和丙二醛的含量随着温度的降低逐渐增加,可溶性糖和可溶性蛋白的含量随着温度的降低呈先增加后降低的趋势。在整个低温变化过程中,阿尔泰新闻和楚依品种沙棘枝条自由水/束缚水比值,电导率和丙二醛含量相对较低。【结论】阿尔泰新闻沙棘品种的抗寒性最好,依此是楚依、辽阜和阿列伊,阿尔泰新闻更适宜新疆寒冷地区种植。