Transcriptome profiling reveals differentially expressed genes associated with wizened flower bud formation in Chinese pear (Pyrus bretschneideri Rehd.)

Flower buds are very important for pear yield; non-germinated flower buds become wizened and drop from the branch, reducing pear production. However, little research has focused on the study of wizened flower bud (WB) formation in spring. In order to elucidate the mechanism of WB formation in pear, physiological indices relating to plant hormones and antioxidases were measured. We found that activities of peroxidase (POD) and superoxide dismutase (SOD) were higher and lower, respectively, in WBs than in normal flower buds (NBs). The contents of indole acetic acid (IAA), gibberellin (GA), and cytokinin (CTK) were lower in WBs, while the level of addition of abscisic acid (ABA) was higher in WBs than in NBs. Differentially expressed genes (DEGs) were surveyed between WBs and NBs. In total, 23 DEGs relating to POD and SOD were detected from GO (Gene Ontology) enrichment, and 29 DEGs associated with plant hormone biosynthesis were found from the KEGG (Kyoto Encyclopedia of Genes and Genomes) pathway. Notably, the expression patterns of these 52 genes were consistent with variations of antioxidase activities or hormone contents. Because POD and SOD are stress-response enzymes, the differences in POD and SOD activities between NBs and WBs indicated that WB formation in pear could result from ambient environmental stresses that influence expression levels of hormone biosynthesis genes.     

Relationship between stomatal behavior and characteristics of photosynthesis and transpiration of Adenophora Iobophylla and A. potaninii at different altitudes

The photosynthesis and transpiration characteristics ofAdenophora Iobophylla and A. potaninii, as well as stomatal behavior such as stomatal size, stomatal density, stomatal open and stomatal conductivity were measured at different altitudes. The relationship between the photosynthesis and transpiration characteristics and the stomatal behavior was analysed by correlation coefficient and path coefficient analysis with altitude changes.The results showed that the influences of stomatal behavior were not evident on the photosynthesis and transpiration characteristics of A. Lobophylla, but evident on that of A. potaninii.     

山西省四种植物新记录种

对１９９８ 年发现的山西省植物新记录种——刺旋花、羽叶火炬树、脱皮榆和红花刺槐作了简要介绍。     

冬小麦限水灌溉条件下磷肥补偿效应的研究

为探索磷肥对土壤水分亏缺的补偿效应,研究了灌水和施磷对冬小麦耗水和产量等的影响。结果表明,冬小麦总耗水量与灌水量成正相关关系,而土壤贮水肖耗量与灌水量成负相关关系;施磷能提高作物耗水量,促进深层土壤水分的消耗。灌水和施磷均能显著提高冬小麦产量;两者相比,灌水增加了单位面积穗数和提高了千粒重,而施磷仅增加了穗数。灌水对经济系数无明显影响,但明显降低水分利用效率;施磷对经济系数和水分利用效率均无明显影     

葡萄糖氧化酶基因在棉花中的高效转化——转化与抗性愈伤组织的诱导和筛选

试验探讨了利用农杆菌介导法把葡萄糖氧化酶基因（ＧＯ基因）转化到棉花中影响转化和抗性愈伤组织诱导的一些因素。结果表明,５～７ｄ 苗龄的无菌苗是做转化的最佳时期,以３Ｄ＋ ２Ｌ处理的无菌苗效果好。下胚轴的形态学部位对转化的影响差异不大。菌株的活力状态是影响转化出愈率的主要因素之一。以菌株的培养时间为依据简便有效。试验还发现,培养基的固化程度不同,出愈率有很大差异,固化程度高,异常愈伤组织增多,正常愈伤组织的出愈率降低。这可能与其活性氧平衡被打破对细胞造成伤害有关。对坑性愈伤组织的筛选次数也做了讨论。     

Research on Adaptive Control of the Feeding System of WEDM Machine Based on Identifying Machining Status

With rapid development of the civil\institutional\commercial central air conditioning system,the energy consumption problem becomes serious.From the view point of operation and management,this paper provides some measures to save energy through choosing suitable cooling and heating equipments,air handling units,terminal units or designing a better water system.     

Several Kinds of CommunicationStandards and IC Circuit Interface

The improvement of Data Communication has made the design of line driver,line receiver and other interface circuits complicated.In accordance with some communication protocols,this paper recommends several IC interface chips and their application in overcoming the influence of noise.     

Factor Score Mapping of Soil Trace Element Contents for the Shenzhen Area

The abundances of copper, lead, zinc, nickel, chromium, cobalt, mercury, vanadium, and manganese in eighty three surface soil samples collected from Shenzhen area were determined. The correlation among element contents and the factors affecting the contents were studied using principle component analysis. The factor scores of the first two components were analyzed as regionalized variables using variogram analysis and Kriging. The interpolated factor scores were then mapped to show the common features in spatial distribution of a set of elements with similar geochemical behavior. It was demonstrated that the spatial distribution patterns of parent material in the area are the primary factor governing the spatial variation of the elements.     

γ辐照对稻米蒸煮和食用品质的影响

本研究了＾６０Ｃｏγ辐照对稻米蒸煮和食用品质的影响。结果表明：在２－１２ｋＧｙ范围内,辐照使低和中等直链淀粉含量的早灿稻浙辐５０４和早粳稻Ｔ２的直链淀粉含量降低,而对高直链淀粉含量的早灿稻浙辐８０２的直链淀粉含量没有明显的影响。辐照使３个品种的胶稠度增大,淀粉粘度谱的最高粘度,热浆粘度,冷胶粘度明显下降。