滨海新围滩涂不同改良方式对土壤盐渍化调控效应及其主控因素

土壤盐渍化是制约滨海新围滩涂围垦区土壤质量的最主要因子,严重抑制了作物的生长和产量。试验设置了对照处理(CK)、有机肥(OM)、聚丙烯酰胺+有机肥(PAM+OM)、秸秆覆盖+有机肥(SM+OM)、秸秆深埋+有机肥(BS+OM)和生物菌肥+有机肥(BM+OM)6个处理方式,研究不同改良方式对滨海盐碱地土壤盐渍化的调控效应,明确改良过程中土壤盐渍化程度变异的主控因素。结果表明,表层土壤含盐量、钠吸附比和碱化度随着燕麦生育期的推移逐渐上升,而pH随着燕麦生育期的推移逐渐下降。与CK处理相比,PAM+OM、SM+OM、BS+OM和BM+OM措施能够显著降低0—20cm深度的土壤含盐量、pH、钠吸附比和碱化度。其中,SM+OM措施对土壤含盐量的抑制效果最好,达到68.0%~73.6%;而BM+OM措施对pH、钠吸附比和碱化度的调控效果最佳,分别降低4.5%~8.2%,61.5%~80.8%和55.5%~79.4%。主控因素分析表明环境因子中的土壤容重、土壤含水量和蒸发量对表层土壤盐渍化程度的影响均达到极显著水平(P<0.01),而风速和降水量的影响则达到显著水平(P<0.05)。     

秸秆和植被覆盖对江苏滨海盐土土壤盐分变化的影响

研究秸秆覆盖和植被(田菁)覆盖条件下滨海盐土土壤水盐的动态变化规律,为沿海滩涂盐碱地脱盐改良提供依据。本研究以含盐量6.98 g·kg~(-1)的滨海盐土为研究对象,设置秸秆覆盖和种植田菁2种覆盖处理,以裸地为对照,研究不同覆盖处理对滨海盐土土壤含水量和土壤盐分动态变化的影响。结果表明:秸秆覆盖下的土壤含水量(27.58%)显著高于田菁覆盖(26.70%)和裸地(26.61%),后两者差异未达显著水平。处理1年后0~20、20~40 cm土层的秸秆覆盖、田菁覆盖和裸地不同处理间土壤含盐量的差异均达显著或极显著水平;秸秆覆盖处理的脱盐率为田菁覆盖处理的2倍。回归分析表明裸地和田菁覆盖下土壤盐分含量与累积降雨量的关系可用二次多项式拟合,田菁覆盖下的淋洗方程(EC_a/EC_i与D_w/D_s间的关系)可用三次多项式拟合;而秸秆覆盖条件下土壤盐分含量与累积降雨量的关系、淋洗方程均表现为指数函数关系y=ae~(bx)(P0.01)。秸秆覆盖条件下滨海滩涂0~40 cm土层脱盐80%需要386.8 mm的累积降雨量。结果表明秸秆和植被覆盖技术在江苏滨海盐土可获得较好的脱盐效果,具有较好的应用前景。     

不同改良剂对滨海盐碱地的改良效果

[目的]研究不同改良剂在黄河入海口附近滨海重盐碱地上的改良效果,选择出适合于该区滨海重盐碱地上的盐碱改良剂。[方法]选用禾康、磷石膏、微生物菌肥、土生、药肥和有机肥在黄河三角洲毛坨试验站进行盐碱地改良试验,分析不同盐碱改良剂对滨海重盐碱地的物理、化学、生物学性质的改良效应。[结果](1)所有改良剂均能显著降低盐碱地土壤容重,增强土壤通透性,尤其是磷石膏和禾康效果更显著;(2)所有改良剂使土壤电导率明显下降(至少15.9%以上),具有较好的压盐降盐作用。(3)对盐碱棉田脱盐效果较好,能有效改善盐碱土壤化学性质的改良剂是磷石膏和禾康;(4)所有改良剂均能增加盐碱地土壤微生物量,增强土壤呼吸,其效果最好的是有机肥和有机肥菌肥混施处理;(5)能较好地改善盐碱地土壤肥力,提高棉花产量的改良剂是有机肥及有机肥菌肥混施处理。[结论]磷石膏、禾康、有机肥及有机肥菌肥混施处理均能明显改良盐碱土物理、化学、生物学性质。     

秸秆覆盖秋浇后盐渍土壤冻融过程及水盐运移特征

为了探讨在寒旱盐灌区覆盖秋浇后冻融土壤的冻融特性及水热盐协同调控机制,在盐渍土壤进行覆盖后秋浇田间冻融试验,设5个处理,秸秆覆盖量1.2kg/m~2(F1.2)、秸秆覆盖量0.9kg/m~2(F0.9)、秸秆覆盖量0.6kg/m~2(F0.6)、秸秆覆盖量0.3kg/m~2(F0.3)、未覆盖(CK)。结果表明:秸秆覆盖影响了土壤冻结融化推进过程,改变了土壤温度对气温变化的响应关系,影响了水分、盐分在土壤剖面(特别是土壤表层和耕作层)的重新分配,提高了翌年春季水分可利用量,抑制了表层及耕作层春季返盐,提高了秋浇的灌水效果。秸秆覆盖处理的最大冻结深度小于CK处理4~26cm,初冻时间滞后0~12d,融化时间滞后0~21d;秸秆覆盖的各处理由于覆盖层的存在,消融水蒸发受到抑制,表层积盐现象较弱;消融期结束后,在土壤表层0—10cm,F0.9的土壤含水率最高,处理F1.2较秋浇前脱盐率为81.18%,脱盐效果最好;在耕作层0—40cm,F0.9的土壤含水率最高,处理F0.6较秋浇前脱盐率为75.65%,脱盐效果最好;为保证在翌年春播时的适宜含盐量及含水率,以覆盖量0.6~0.9kg/m~2为宜。研究结果可为河套灌区秋浇制度的优化提供参考。     

秸秆和植被覆盖对滩涂围垦区土壤盐分和肥力性质的影响

为探明不同地面覆盖对滩涂围垦区土壤盐分变化和肥力性质的影响,于2014年5月~2015年5月,在江苏如东东凌垦区开展了秸秆和植被覆盖的田间试验,设置对照(CK,裸地)、15 t/hm~2秸秆覆盖(SM)、植被覆盖(PC,田菁-野生芥菜种植)和植被覆盖结合7.5 t/hm~2秸秆覆盖(PC+1/2SM)4种试验处理。结果表明:(1)与CK处理相比,覆盖处理半年后(12月),SM处理0~40 cm土壤含盐量下降了91.0%以上(P0.05),而PC和PC+1/2SM处理0~40 cm没有明显的降盐效果(P0.05);SM、PC和PC+1/2SM处理1年后滩涂围垦区0~100 cm各土层土壤含盐量均有明显地下降,SM、PC和PC+1/2SM处理0~40和40~100 cm土壤含盐量分别下降了97.0%和83.0%以上,40.0%和30.0%以上,54.0%和33.0%以上;(2)SM和PC+1/2SM处理0~100 cm土壤pH值均显著高于CK和PC处理(P0.05),而CK与PC处理间pH变化没有明显差异;(3)PC和PC+1/2SM处理显著增加了表层(0~20 cm)土壤有机碳、全氮、碱解氮含量及孔隙度,显著降低了表层土壤容重(P0.05),但SM处理对土壤容重、有机碳、全氮、碱解氮、有效磷等均没有明显的影响。因此,相比PC和PC+1/2SM处理,虽然15 t/hm~2秸秆覆盖措施对滩涂围垦区土壤降盐效果更为明显,但综合考虑土壤培肥和降盐效果,种植耐盐植被结合适量秸秆覆盖(如15 t/hm~2秸秆覆盖)是滩涂围垦区降盐改土的重要措施之一。     

气候因子和地表覆盖对沿海滩涂土壤盐分动态的影响

为探明气候因子对沿海滩涂表层土壤盐分季节性变化规律的影响,并探讨植被和秸秆覆盖对滩涂土壤脱盐效果及控盐的作用。2014年5月—2015年5月,在江苏沿海滩涂盐碱地(中重度盐分),设置4种处理进行田间试验,分别为对照(裸地,CK)、秸秆覆盖(覆盖量为15 t·hm-2,SM)、植被覆盖(PC)和植被+秸秆覆盖(覆盖量为7.5 t·hm-2,PC+1/2SM),监测了气候因子和表层土壤盐分的季节性动态变化。结果表明:1)在沿海滩涂裸地中,土壤盐分具有一定程度的季节性规律,表现为在10—12月具有明显的积盐效果,且在10月EC1︰5达到最大值为3.90 d S·m-1。2)相关分析表明:采样前7 d降雨累积量与土壤盐分变化有着极密切负相关关系;气候因子的多因子及互作逐步分析表明:降雨量增加可以促进土壤脱盐作用,大气温度升高可加剧土壤盐分表聚,降雨量和大气温度的互作效应增加会对土壤盐分累积产生正效应。3)地表覆盖(包括PC和SM)显著地改变了气候因子对土壤盐分动态变化的影响,累积降雨量和大气平均温度与土壤盐分无显著相关性,且大量秸秆覆盖对滩涂表层土壤脱盐具有更明显的效果。因此,在沿海气候向暖湿方向发展的趋势下,综合考虑脱盐及控盐作用,选择适量秸秆覆盖(如覆盖量15 t·hm-2)或适量秸秆覆盖结合植被种植覆盖,同时充分利用沿海地区降雨量集中的特点,可能是未来滩涂盐碱盐渍土快速脱盐和土壤改良的重要措施。     

秸秆深埋配施硫酸铝对西辽河平原地区 苏打盐碱土水盐运移的影响

为探索秸秆深埋和硫酸铝改良剂配施交互作用对苏打盐碱地水盐运移的影响,在通辽市科尔沁左翼中旗开展覆膜滴灌下不同硫酸铝用量与秸秆深埋的田间试验,以甜菜为指示作物,常规处理为对照(CK),在有无秸秆深埋(A、B)的条件下分别设置4 水平硫酸铝添加量(30、60、90、120 g/m2),揭示硫酸铝用量、秸秆深埋与土壤含水率、盐分的相关关系,提出覆膜滴灌及秸秆深埋下适宜的硫酸铝用量。结果显示,未添加秸秆处理中B3 处理0 ～ 50 cm 土体平均含水率最高(23.8%),比CK 高8.2%,且平均含盐量最低(1.69 g/kg),比CK 低12.6%;添加秸秆处理中A3 处理0 ～ 50 cm 土体平均含水率最高(26.6%),比B3 处理高2.8%,平均含盐量也最低(1.57 g/kg),比B3 处理低19%,且平均积盐率最低,比B3 处理降低7.6%;A3 处理在10 ～ 20 和20 ～ 30 cm 处土壤含水率均显著高于B3 处理(P<0.05),在0 ～ 10 和20 ～ 30 cm 处土壤含盐量较B3 处理显著降低(P<0.05);A3 处理0 ～ 30 cm 各土层均有脱盐趋势,达到显著水平(P<0.05),平均脱盐率11.5%;硫酸铝和秸秆深埋交互作用与土壤含水率呈极显著正相关(0.808),与土壤含盐量呈显著负相关(-0.564)。秸秆深埋和硫酸铝改良剂综合作用可有效降低土壤pH 值0.53 ～ 0.94,缓解土壤碱化度20.5% ～ 21.9%。覆膜滴灌及秸秆深埋下硫酸铝用量在72 ～ 104 g/m2 为适宜当地的推荐用量。研究结果可为西辽河平原地区盐碱土壤改良提供理论依据。     

秸秆覆盖对盐渍土壤水盐状况及向日葵产量的影响

为了探讨秸秆覆盖对盐碱耕地种植向日葵下的土壤水、盐变化规律及向日葵产量的影响,研究采用田间试验的方法,设5个处理展开研究,分别为覆盖量1.2 kg m-2(F1.2)、0.9 kg m-2(F0.9)、0.6 kg m-2(F0.6)、0.3 kg m-2(F0.3)和未覆盖(CK)。结果表明:向日葵整个生育期内,覆盖处理F1.2、F0.9、F0.6和F0.3的0~100 cm土壤储水量平均值较CK分别提高了42.69 mm、41.59 mm、25.95 mm和20.51 mm,其中处理F1.2、F0.9与CK差异达显著水平,而F0.6、F0.3与CK差异并不显著;覆盖处理F1.2、F0.9、F0.6的土壤表层电导率收获后较播前减少20.5%、5.3%、2.4%,土壤表层脱盐。而F0.3增加1.2%、CK增加7.6%,土壤表层呈积盐;秸秆覆盖的各处理下,向日葵产量均较CK有不同程度的提高,覆盖F0.6处理的产量为最高,比CK增产28.2%,达到3963.79 kghm-2。综合考虑各因素,玉米秸秆覆盖盐碱耕地种植向日葵以覆盖量0.6~0.9 kg m-2为宜。基于以上的研究表明,秸秆覆盖保水、抑制返盐及增产效果明显,是值得推广的一项盐碱地高效利用技术。     

不同改良措施对银川平原盐碱地土壤性质及酶活性的影响

研究了秸杆、有机肥、烟气脱硫废弃物、盐碱地改良剂对银川平原盐碱地进行改良后土壤理化性质及土壤酶活性的变化。结果表明:4种改良措施对土壤pH值、全盐含量、土壤容重均有不同程度的降低,脱硫废弃物和改良剂处理降低土壤pH值和全盐含量效果显著,改良剂和有机肥处理降低土壤容重、增加土壤孔隙度的效果显著。盐碱地改良后土壤转化酶活性、脲酶活性和碱性磷酸酶活性增加的幅度分别为0.02%～85.0%,2.7%～53.3%,17.9%～49.7%,各改良措施对过氧化氢酶活性的影响不显著。土壤pH值、全盐含量和土壤容重之间互成显著正相关关系(p<0.05),与土壤孔隙度呈显著负相关关系(p<0.05);土壤容重与土壤孔隙度、过氧化氢酶、脲酶活性之间达到显著负相关关系(p<0.05),土壤碱性磷酸酶、转化酶、土壤过氧化氢酶和脲酶之间互成显著正相关关系(p<0.05)。     

秸秆覆盖增强滩涂重盐土雨水脱盐的效果

为促进沿海滩涂盐碱地脱盐和开发利用,研究了三个秸秆覆盖水平——0、1.5和3 kg m~(-2)下滨海重盐土(EC1:5=4.18 dS m~(-1))土壤盐分的动态变化规律。结果表明2种秸秆覆盖量对0~40 cm表土均具有较好的快速脱盐效果,处理后3个半月0~20 cm和20~40 cm的土壤盐分分别降至0.18/0.15和0.80/0.41 dS m~(-1),0~40 cm土层脱盐率达90%以上。回归分析表明土壤盐分含量与累积降雨量、淋洗方程(ECa/ECi与Dw/Ds间的关系)均表现为指数函数关系,模拟的效果均较好(P 0.01)。1.5 kgm~(-2)秸秆覆盖条件下0~20 cm和0~40 cm土壤剖面脱盐80%需要142 mm和324 mm的累积降雨量,而3 kg m~(-2)秸秆覆盖条件下0~20 cm和0~40 cm土壤剖面脱盐80%需要186 mm和316 mm的累积降雨量。两种覆盖量脱盐效果的差别主要体现在1m剖面的60~100 cm。秸秆覆盖增加了雨季滨海重盐土的淋洗效果,秸秆覆盖条件下滨海重滩涂脱盐80%需要320 mm的累积降雨量,江苏沿海地区雨季(6~8月)的常年雨量可满足这一要求。     

Role of selenium in mitigation of cadmium toxicity in pepper grown in hydroponic condition

Selenium (Se) is an essential element for humans but is not considered as essential for plants. However, its beneficial role in improving plant growth and stress tolerances is well established. In order to study the role of Se in cadmium (Cd) toxicity in pepper (Capsicum frutescens cv. Suryankhi Cluster), this experiment was carried out in greenhouse conditions. Treatments comprised Cd [0, 0.25, and 0.5 mM cadmium chloride (CdCl₂)] and Se [0, 3, and 7 µM sodium selenite (Na₂SeO₃)] with three replications. The result showed that Cd decreased chlorophyll a, chlorophyll b, and carotenoids, whereas Se supplementation diminished Cd toxicity on photosynthetic pigment. Selenium at 7 µM significantly increased the leaf area in the plants grown at 0.25 mM Cd. The application of Se at 3 µM with 0.25 mM Cd and Se at 3 µM and Se at 7 µM with 0.5 mM Cd increased the activity of catalase (CAT). Selenium at 7 µM decreased the proline content of pepper leaves exposed to Cd at 0.5 mM (30%). Selenium significantly enhanced the antioxidant activity of leaves, which was diminished by Cd toxicity. In general, Se has a beneficial effect on plant growth and is an antioxidant enzyme of pepper cv. Suryankhi Cluster under Cd stress and non-stress conditions.     

红壤区不同肥力水稻土根际硝化作用特征

通过根际培养箱(三室)——速冻切片技术研究了红壤地区高、低两种肥力下水稻苗期根表、根际和土体土壤矿质态氮含量和硝化强度,以及水稻生长、氮素积累的差异。结果表明,肥力水平对水稻根表和根际土壤铵态氮(NH4+-N)含量无显著影响,但高肥力显著提高土体土壤NH4+-N含量,以及根表、根际和土体土壤硝态氮(NO3--N)含量及硝化强度。两种肥力水稻土硝化强度最大值均出现在距根表2 mm处,分别为0.20和0.31μmol kg-1 h-1。土体土壤硝化强度随距根表距离增加而降低,低肥力土壤在距根表10～40mm处时硝化强度接近本底值,而高肥力土壤在距根表20～40 mm处时接近本底值。与不种水稻的CK相比,种植水稻显著提高根际土壤硝化强度。高肥力能显著改善水稻生长,增加植株氮素积累量,尤其显著促进根系生长及通气组织发育。由于红壤稻田肥力水平的差异造成水稻根际硝化强度以及水稻吸收NO3-的差异,导致高肥条件下水稻显示出更强的生长势和氮素吸收利用能力。因此,合理提高红壤稻田肥力水平对改善红壤区水稻根际土壤硝化作用及水稻氮素营养具有重要意义。     

Accumulation of copper in soils and leaves of tomato plants in greenhouses in Turkey

Copper (Cu)‐containing fertilizers, fungicides, and bactericides has been used extensively in the greenhouses in the Antalya province in recent decades with the use of such materials tending to increase year by year. The level of DTPA‐extractable Cu was determined in 210 soils (0–20 and 20–40 cm depth) and 105 leaf samples obtained from 105 tomato greenhouses. The DTPA‐extractable Cu contents of the soils taken from the 0–20 depth ranged between 0.76 and 88.03 mg kg^‐1 (mean 7.79 mg kg^‐1). The percentage of soils containing DTPA‐extractable Cu greater than the critical toxicity level (20 mg kg^‐1) was 8.1. The Cu content of tomato leaf samples ranged between 2.4 and 1,490 mg kg^‐1 (mean 166.5 mg kg^‐1). The Cu concentration in leaf samples was very high due to the intensive use of foliar applied Cu‐containing chemicals. As a consequence, 24.8% of the leaf tomato samples analyzed contained over 200 mg Cu kg^‐1, the maximum accepted tolerance level. Therefore, it may be necessary to reduce the use of Cu‐containing pesticides and fertilizers, or at least reduce the amount of Cu‐containing fertilizers being used in those greenhouses where Cu‐containing pesticides have been or are being used.     

自由基在鸡肾病发生中的作用研究

肾病即急性肾小管坏死.鸡肾病在养鸡生产中极为常见,尤其近年来,鸡肾病的发生日益增多,由于其发生机制不清楚,临床治疗鸡肾病的依据不足,致使治疗效果不佳,为此,提出本研究以探讨鸡肾病的发生机制,为本病防治提供理论依据.     

Occurrence of Sexual Hormones in Sediments of Mangrove in Brazil

The presence of sexual hormones (female estrogens) was assessed in sediments of a mangrove located in the urban region of southern Brazil. The estrogens are involved in human sexual reproduction. They act as the chemical messengers, and they are classified as natural and synthetic. The estrogens inputs in the environment are from treated and untreated sewage. The presence of estrogens in sewage is excretion from the female due to natural production and use of contraceptives (synthetic estrogens). With the indiscriminate release of sewage into the environment, estrogens can be found in rivers, lakes, and even in oceans. In this work, the presence of estrone (E1), 17-??-estradiol (E2), and 17-??-ethynilestradiol (EE2) in eight sedimentary stations in Itacorubi mangrove located on Santa Catarina Island, south Brazil, was investigated. Historically, the Itacorubi mangrove has been impacted by anthropogenic activities because the mangrove is inserted in the urban area of the Florianopolis. The estrogen EE2, used as contraceptive, had the highest concentration in mangrove sediment, 129.75?±?3.89 ng/g. E2 was also found, with its concentration ranging from 0.90?±?0.03 to 39.77?±?1.19 ng/g. Following the mechanism, under aerobic or anaerobic conditions, E2 will first be oxidized to E1, which is further oxidized to unknown metabolites and finally to CO₂ and water (mineralized). EE2 is oxidized to unknown metabolites and also finally mineralized. Theoretically, under anaerobic conditions, EE2 can be reduced to E1 even in environments such as mangrove which is essentially anaerobic.     

Meta-analysis in the Selection of Groups in Varieties of Citrus

Brazil is the largest producer of oranges (Citrus sinensis) in the world. The nutrient management of tree orchards is designed from experiments with a limited number of varieties. This knowledge is transferred to other varieties by diagnosing tissue nutrient composition and tree demand. Compositional data analysis has been first applied to tissue analysis of agricultural crops using centered log ratios with compositional nutrient diagnosis (CND-clr). The isometric log ratio (ilr) transformation is a new approach based on binary nutrient ratios and the principle of orthogonality (CND-ilr). We analyzed eleven nutrients: nitrogen (N), sulfur (S), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), boron (B), copper (Cu), zinc (Zn), manganese (Mn), and iron (Fe) in leaf tissue samples across 108 commercial plots (thirty-one grow Valencia, twenty-two Hamlim, twenty Pera, and thirty-five Natal). Nutrients were partitioned between macro- and micronutrients as well as anionic and cationic species. The effect size of varieties over Valencia was quantified by the mean and standard deviation of ilr values across ilr coordinates. Specific varietal nutrient profiles and ilr norms were defined. The nutrient profile of orange varieties could be classified into homogeneous groups to take advantage of fertilizer trials conducted on varieties of the same group. The Aitchison distance and a perturbation vector could be instrumental for diagnostic purposes and nutrient management.     

Effect of iron-quercetin complex on reduction of nitrite in in vitro and in vivo systems

This study investigated whether reducing agents such as quercetin and iron(II) facilitate formation of nitric oxide (NO) gas from orally ingested nitrite in an vivo study. When 3 mg/kg Na (15)NO2 was orally administered to rats with or without iron(II) or quercetin, Hb (15)NO, which is indicative of systemic (15)NO, was detected in the blood, with the maximum blood concentration of Hb (15)NO at 15 min after nitrite or nitrite plus quercetin treatment, whereas after administration of nitrite plus iron(II) or nitrite plus iron(II) and quercetin, the time was shortened to 10 min. Interestingly, iron(II), quercetin, or iron(II) plus quercetin did not affect the total amount of Hb (15)NO generated from orally administered Na (15)NO2. However, the systemic nitrite concentration was significantly decreased in the presence of iron(II) or iron(II) plus quercetin. These results may indicate that iron(II) is critical to the generation of NO gas from nitrite, whereas quercetin contributed little under the in vivo experimental conditions.     

旱地果园水肥管理模式研究进展

分析了旱地果园水肥管理模式的研究进展和存在问题,指出水肥胁迫尤其是水钾已成为旱区果树高产稳产优质化的主要限制因子。在系统探讨旱地果园水分管理、养分管理、综合管理以及果树叶营养综合诊断施肥标准的基础上,提出了旱地果园的高效水肥管理模式。     

Role of aldehyde oxidase in the hepatic in vitro metabolism of 3-methylindole in pigs

The metabolism of 3-hydroxy-3-methylindolenine (HMI), a recently discovered metabolite of 3-methylindole (3MI, skatole) produced by porcine liver microsomes, was investigated in vitro using porcine liver cytosol. HMI was rapidly metabolized to a single product, 3-hydroxy-3-methyloxindole (HMOI), by porcine cytosol. By the use of the selective inhibitors menadione and quinacrine, it was shown that the enzyme responsible for the oxidation of HMI into HMOI was aldehyde oxidase (AO; aldehyde:oxygen oxidoreductase, EC 1.2.3.1). The activity of AO in the conversion of HMI to HMOI was measured in a population of pigs (n = 30) with a wide range of 3MI levels in back fat (0.07-0.30 mg/kg). AO activity was found to be negatively correlated (r = -0.70; P < 0.001) with the level of 3MI in fat. The results of the present study suggest that AO plays an important role in the metabolism of 3MI in the pig and that its catalytic activity is related to an adequate 3MI clearance.     

植物CBL基因家族的研究进展

细胞中游离的Ca2+是植物细胞中普遍存在的第二信使,类钙调神经素B亚基蛋白CBL作为一种特殊的钙感受器在植物生长发育和逆境胁迫响应过程中发挥重要作用.本文主要对植物CBL家族的起源与进化、蛋白结构、亚细胞定位以及CBL的功能进行综述,并对今后钙感受器CBL家族的研究重点和发展方向进行了展望.