钾肥对砂质潮土夏玉米产量及土壤钾素平衡的影响

在砂质潮土上设置田间试验,研究了不同施钾量与钾肥施用方式对夏玉米产量及土壤钾素平衡的影响。结果表明:随着钾肥用量的增加,夏玉米产量、土壤速效钾含量和植株钾素积累量均增加,要保持土壤速效钾平衡,钾肥用量应达150kg/hm²以上。相同施钾水平下,分次施钾的增产增收效应、钾肥当季回收率均显著高于一次基施肥处理。从钾肥的增产增收效应、钾肥当季回收率、土壤钾素平衡等多方面综合分析,以施钾量225kg/hm²分次施用时效果最好,与不施钾处理相比可增产1026kg/hm²,钾肥当季回收率为45.9%,并实现土壤速效钾的盈余。     

Immunostimulating and growth-promoting effects of sugar cane extract (SCE) in chickens

Polymorphonuclear cells of the peripheral blood in the chicken significantly increased their phagocytosis when cultured with sugar cane extract (SCE; 250-1,000 microg/ml) for 24 hr. Chickens orally administered SCE (500 mg/kg/day) for 3 or 6 consecutive days at 1 week of age showed significantly higher body weight and gain in body weight/day and a lower food conversion ratio within the growing period of 6 weeks than physiological saline-administered control chickens. Furthermore, oral administration of SCE also resulted in significantly higher immune responses against sheep red blood cells and Brucella abortus. These results suggest that SCE has immunostimulating and growth promoting effects in chickens.     

河套灌区控制排水对油葵生长与养分利用的影响

为系统地从土壤水分、盐分、养分和油葵生长的变化来揭示不同排水方式的调控效应,设置4个处理,生育期暗管控制排水深度分别为40 cm(K1)、70 cm(K2)、100 cm(K3),春灌排水深度均为100 cm,选择明沟排水(深度150 cm)作为对照处理(CK),开展了田间试验.结果 表明:K1处理自油葵开花期到收获1...     

猪源乳酸杆菌的分离鉴定及生物学特性分析

乳酸杆菌制剂可以替代抗生素,用于预防和治疗细菌性腹泻。为获取可作为微生态制剂的候选菌株,从健康仔猪肠道分离到5株乳酸杆菌,经抑菌试验、生长曲线测定、耐酸、耐胆盐、耐胰酶试验等,筛选到1株对大肠杆菌、沙门氏菌、金黄色葡萄球菌等致病菌有较好的抑制作用,对低pH值、高胆盐、胰酶均有一定耐受能力的乳酸杆菌,命名为LY7。经PCR鉴定,该菌株为约氏乳杆菌。     

竹柳等4个柳树无性系造纸材性测定分析

对3年生竹柳、苏柳172、苏柳795、苏柳799进行造纸材性测定,结果表明:4个柳树无性系的木材基本密度在0.324~0.368 g/cm3之间,纤维长度在0.866 9~0.928 8 mm之间,纤维宽度在21.349~22.683μm之间。4个柳树无性系木材纤维的长宽比、壁腔比及腔径比等指标均符合造纸原料要求,而且纤维长度、宽度均分布比较均匀。     

The mTOR-regulated phosphoproteome reveals a mechanism of mTORC1-mediated inhibition of growth factor signaling

The mammalian target of rapamycin (mTOR) protein kinase is a master growth promoter that nucleates two complexes, mTORC1 and mTORC2. Despite the diverse processes controlled by mTOR, few substrates are known. We defined the mTOR-regulated phosphoproteome by quantitative mass spectrometry and characterized the primary sequence motif specificity of mTOR using positional scanning peptide libraries. We found that the phosphorylation response to insulin is largely mTOR dependent and that mTOR exhibits a unique preference for proline, hydrophobic, and aromatic residues at the +1 position. The adaptor protein Grb10 was identified as an mTORC1 substrate that mediates the inhibition of phosphoinositide 3-kinase typical of cells lacking tuberous sclerosis complex 2 (TSC2), a tumor suppressor and negative regulator of mTORC1. Our work clarifies how mTORC1 inhibits growth factor signaling and opens new areas of investigation in mTOR biology.     

成熟黄瓜果皮红色性状的遗传分析及其基因定位

 以黄瓜（Cucumis sativus L.）成熟瓜红色果皮自交系‘NCG127’（P₁）和成熟瓜黄色果皮自交系‘9930’（P₂）为试验材料构建F₂遗传群体,对成熟瓜红色果皮R基因进行遗传分析和基因定位研究。结果表明,黄瓜成熟瓜红色果皮性状由显性单基因控制,红色对黄色为显性。以256株F₂分离群体为试材,应用群体分离分析（BSA）法筛选得到与R基因连锁的20个多态性SSR标记,构建了R基因的分子标记连锁图谱,将R基因定位到黄瓜4号染色体上,物理距离为213.4 kb的区段内,两侧翼标记为UW019319和UW019203,与R遗传距离分别为0.8 cM和0.7 cM。生物信息学分析表明,该区段存在30个预测候选基因。     

反坡水平阶水土保持效益观测

 在昆明市松华坝水源区牧羊河中游坡耕地布设反坡水平阶与对照径流小区,观测2种径流小区的径流量、泥沙量、总氮及总磷输出浓度和输出量。结果表明:与对照相比,反坡水平阶径流量减少34.14%、土壤流失量减少57.17%、总氮和总磷输出量分别减少33.32%和33.82%。坡耕地修反坡水平阶起到了较明显的保水、保土、保肥作用,对控制面源污染物具有重要意义。     

Effects of Waterlogging on Photosynthesis and Antioxidant Enzyme Activities of Six Barley Genotypes with Different Waterlogging Tolerance

A field experiment was carried out to study genotypic difference in the effect of waterlogging on photosynthesis, chlorophyll content and antioxidative enzyme activities in barley. Waterlogging caused a rapid decline in net photosynthetic rate (Ph) and stomatal conductance (gs), and little change in chlorophyll content during early days of the treatment. A dramatic increase in malondialdehyde (MDA) content, superoxide dismutase (SOD) and peroxidase (POD) in waterlogged plants in the early days of the experiment was found, indicating the occurrence of oxidative stress in barley plants exposed to waterlogging. There was a highly significant difference in the changed extent of all these parameters among genotypes.Franklin and Yongjiahong Liuleng Damai, which were relatively sensitive to waterlogging in terms of growth, photosynthesis and chlorophyll content, accumulated much more MDA than the other two relatively tolerant genotypes (93-3143 and QS).After removal of waterlogging, the genotypic difference became much greater in recovering of these examined parameters.Yongjiahong Liuleng Damai showed higher recovery, while Franklin only recovered to 50% of the control at the 14 day after waterlogging removal. It may be concluded that it is the difference in anti-oxidative stress caused by waterlogging that account for the major difference in photosynthesis among barley genotypes.