Analysis on Stable Reliability of Soft Ground Reinforced by Plastic Drainage Board

In this paper the stabilization of ground reinforced by plastic drain board is analyzed and calculated by reliability method. The reliable index is calculated by polyhedron error function, based on studying variability of the shearing strength of reinforced ground. The standard of ground stable index is proposed through some practical works.     

Effects of CO2 enrichment on young plant growth of 96 genotypes of tomato (Lycopersicon esculentum)

Summary The early growth of 96 genotypes of tomato was studied at 320 ppm CO₂ and at 750 ppm CO₂ in separate climate rooms. Plants were harvested at 40 and 55 days after sowing. Fresh and dry weights were determined. Large differences between genotypes were found for average plant fresh and dry weights and for relative growth rates. The average overall growth enhancement by CO₂ enrichment was 2.3. Two genotypes showed significant genotype x CO₂ interaction. The consequences of these results for tomato breeding are discussed.     

Production of interspecific hybrids between Glycine max and G. tomentella through embryo culture

Summary Interspecific hybrids have been obtained in an incompatible cross between Glycine max and G. tomentella through the in vitro culture of hybrid embryos. The percentage of successful pod setting in the crosses averaged 12.8% but there were marked differences depending on the soybean cultivar used as the female parent. Hybrid embryos at globular to heart stages were extracted from the embryo sac 15–25 days after pollination and cultured in vitro. Hybrid plants were successfully obtained by culturing the embryos on B5 medium supplemented with 0.1 mg/l IBA followed by culture on B5 medium supplemented with 0.1 mg/l TBA plus 0.25 mg/l 2-iP. The F1 plants resembled the wild male parent in growth form, but had an intermediate leaf shape between that of the parents.     

普通小麦体细胞无性系R2代变异发生特点

小麦Ｒ２代体细胞无性系变异存在４种发生方式，即合株性稳定谱异，全株分离变异，穗系嵌合稳定变异，穗系嵌合分离变异，其中稳定变异相当普遍、红占总变异的１／３。发生阶段较全株性变异于发生较迟的穗系嵌合变异。不同的变异性状有不同折发生方式。株型、穗型、芒型和叶色变异多为分离变异，熟期为稳定变异，株高，腊质等兼有稳定及分离变异，其中某性状是显性突变的结果，多数分离性状的分离均属简单分离，且箐少见到基因突变的     

生物电化学系统还原二氧化碳产甲烷研究进展

生物电化学系统还原CO2合成燃料或有机化工产品近年来已成为环境微生物学的研究热点。首先就生物电化学系统的工作原理、生物电化学系统还原CO2产甲烷的阴极功能微生物、生物电化学系统还原CO2产甲烷的机制、生物电化学系统的反应器及影响生物电化学系统还原CO2产甲烷的因素等方面的研究进展进行了综述,然后分析了生物电化学系统还原CO2产甲烷存在的问题,并讨论了其今后的重点研究方向,以期为生物电化学系统还原CO2产甲烷研究提供参考。     

胁迫相关蛋白激酶基因OsSAPK2调控水稻抗白叶枯病反应

水稻蔗糖非酵解型蛋白激酶Sn RK2,又称胁迫相关蛋白激酶(stress-activated protein kinase genes in rice,Os SAPKs),在调控水稻非生物胁迫信号传导中起着重要作用。本研究对Os SAPK2的结构及其在水稻抗白叶枯病反应中的功能进行了初步研究。结果表明Os SAPK2被定位于细胞核和细胞质内,与Os SAPK1、Os SAPK3同属于Kulik’s II组。Os SAPK2-RNAi转基因水稻中Os SAPK2下调表达,人工接种水稻白叶枯病菌后,转基因水稻比受体对照的病斑长度显著增长,抗病相关基因Os LRR1、Os HIR1表达水平下降,感病相关基因Os MAPK5表达水平升高。此外,Os SAPK2具有自激活活性,可能与Os MAPK5等胁迫相关蛋白互作。上述结果为进一步研究Os SAPK2调控水稻抗白叶枯病的分子机制提供了信息。     

The effect of plastic mulch on the fate of urea-N in rain-fed maize production in a semiarid environment as assessed by 15N-labeling

A better understanding of the fate of fertilizer nitrogen (N) is critical to design appropriate N management strategies in plastic-mulched croplands. We evaluated the effects of plastic mulch on urea-N recovery by crops and loss from soil in furrow-ridge plots, with and without maize (Zea mays L.) cropping, in a semi-arid rain-fed site in China. We applied the same rate of urea-N (281 kg ha⁻¹) to all treatments during the preparation of the furrow-ridges in 2011 and 2012 but ¹⁵N-labeled the urea in 2011 only. We used transparent film to cover all soil surfaces in the mulched treatments and seeded maize in furrows in treatments with crop. In 2011, plastic mulch increased the total N uptake in the aboveground biomass of maize by 53%, whereas it decreased the in-season labeled-N uptake by 19%, compared to non-mulched treatment. At harvest in 2011, in mulched treatments the total labeled-N remaining in the 0−170 cm soil layer was 25% greater whereas unaccounted labeled-N was 69% less, than in non-mulched treatments, regardless of whether maize was cropped. In 2012 the effect of mulch on total maize N uptake was comparable to that in 2011, but the residual soil labeled-N uptake by maize was 63% higher in mulched compared to non-mulched treatment. At harvest in 2012, plastic mulch increased total labeled-N remaining in the 0−170 cm depth in cropped soils and unaccounted labeled-N in non-cropped soils, compared with no mulch. Our results indicate that plastic mulch profoundly changes the fate of urea-N in maize production in cold and dry croplands.     

Cmponent Study on Flavonoids From Leaves of Dendrocalamus Latiflorus

从麻竹（Dendrocalamus latiflorus）叶中分离得到四个黄酮类化合物。经性质和光谱（UV,IR,MS,1HNMR,13CNMR等）法鉴定其结构,分别为牡荆苷（?）,芦丁（II）,山奈酚-3-O-β-D-芸香糖苷（III）,山奈酚-3-O-β-D-葡萄糖基(1-2)-α-L-鼠李糖苷（IV）。四种化合物均为首次从该植物中得到。     

氯化钴处理微藻的生物学效应初报

在塔胞藻培养液中加入不同浓度的CoCl2(0、2、4、6、8、10、12mg/L),然后分析了氯化钴处理塔胞藻的生物学效应。结果发现,当培养液中钴离子浓度较低时,塔胞藻被处理后的生物学效应明显优于对照。当钴离子浓度达到一定值(6mg/L)时,则随着钴离子浓度的升高,细胞的生长繁殖在前2轮(9d为一轮)培养中均明显降低;细胞内的蛋白质、叶绿素含量也均明显下降,而可溶性糖的含量与对照相比变化不大。继续培养,塔胞藻细胞的生长繁殖及细胞内含物含量接近正常值。     

镉处理对绿豆种子萌发及蛋白质含量的影响

采用室内试验方法，研究了不同浓度的Cd^2＋溶液对绿豆种子萌发及蛋白质含量的影响。结果表明，当Cd^2＋溶液浓度低于20mg/L时，种子的发芽率不受Cd^2＋溶液浓度的影响；当Cd^2＋溶液浓度低于10mg／L时，种子的发芽指数不受Cd^2＋溶液浓度的影响；与对照相比。种子的活力指数与发芽势随着Cd^2＋浓度的增加而下降。种子内的蛋白质含量随着Cd^2＋溶液浓度的提高而升高，而蛋白酶活性和自由氨基酸的含量均下降。