Effects of Carbon Dioxide on Astringency Removal in Mopanshi Persimmon

Fruits of persimmon (Diospyros kaki cv. Mopanshi) were used to investigate the effects of different concentrations of carbon dioxide (CO2) gas on removing astringency after harvest. Treatment of 95 % concentration of CO2 gas gave the best results; fruits turned non-astringent after 20 h, and kept the fruit firm for 7 d at room temperature. Fruits, treated with 85 and 90 % concentration of CO2 gas, turned non-astringent after 24 - 28 h, and the firmness-keeping stage was 5 - 6 d at room temperature. While the CO2 gas was at 80, 70 and 60%, the de-astringency period was 48, 72 and 96 h, and the corresponding firmness-keeping stage was 3, 2 and 1 d, respectively. Fruits, treated with 50 % concentration of CO2 gas,remained astringent.     

苹果叶表附生微生物区系及其有益菌的研究 Ⅱ、有益芽孢杆菌的筛选、初步鉴定和电镜观察

 在分析了同一生态条件下苹果褐斑病抗感品种的叶部微生物类群的基础上,从已获得的7株Bacilus中筛选出3株普遍对苹果轮纹病、炭疽病、霉心病具拮抗作用的菌株,再通过对其菌体代谢液中激素的定性定量分析,筛选出B₀₁₇(经鉴定为Bacilus cereus)作为本实验的益菌.扫描电镜观察表明B₀₁₇能在苹果叶面定殖和繁衍.     

梨黑星菌的产孢研究

研究表明:①梨黑星菌分生孢子单生于菌丝顶端或分枝顶端膨大的细胞上,产孢细胞作拟单轴式延伸。孢子脱落后孢子梗上留下明显的孢痕。②不同光照对黑星菌产孢的效用各异。以先黑暗后黑光产孢最多,自然散射光次之。③梨黑星菌分生孢子在16℃产生较多。尤以先20℃培养再移至16℃下更好。④梨黑星菌产孢在PDA和麦芽汁琼脂上较好。     

△6-脂肪酸脱饱和酶基因种子特异表达载体的构建

以napA基因序列设计引物，以甘蓝型油菜中油821基因组总DNA为模板，通过PCR扩增，克隆了种子特异表达napin启动子。序列分析表明，试验得到扩增片段长1148bp，含有其它napin启动子序列共有的高度保守序列。将扩增序列与真菌匍枝根霉Δ6-脂肪酸脱氢酶基因RnD6D连接，构建了RnD6D的种子特异表达载体pCNR，为获得高产γ-亚麻酸的转基因油菜奠定了基础。     

Classification of some indigenous maize collections from Southern and Southeastern Europe

A race classification, based on multiple variate analysis using 23 morphological characteristics, was applied to 42 indigenous maize strains from Southeastern Europe, 20 race collections from Spain and 2 Corn Belt Dent hybrids from the United States. Based on the evidence obtained and on comparisons with other studies, the Southeastern European strains were assigned to one of seven races or race groups, of which at least five appear on historical evidence to be derived directly or by recent hybridization from importations originating in North America. In contrast, the majority of the Spanish collections appeared to have their origins in importations from Central America or the West Indies. Very little similarity was observed between the Spanish and Southeastern European collections, when considered overall.Detailed classification and study of European maize appears highly desirable as an aid to utilization of this potentially valuable germ plasm in world maize breeding programs.     

影响雾滴靶标沉积效果的三种因素实验分析

为了节省农药及减少对生态环境的污染,研究喷雾角度、荷电电压、叶片表面性质对静电喷雾施药靶标沉积效果的综合影响,以黄瓜、西红柿、菠菜的叶片作为靶标进行静电喷雾实验,结合实验结果对喷雾角度、荷电电压、叶片表面性质与靶标沉积效果的关系进行分析和讨论。结果表明:随着喷雾角度的增加,荷电雾滴在叶片上的沉积量先升后降,合适的喷雾角度会使3种靶标上的沉积量都增加,对3种叶片最佳喷雾角度都为60°;荷电电压、叶片表面性质对沉积效果影响显著;叶片表面结构是影响作物上药液沉积效果的重要因素。该研究有助于更加合理高效调控静电喷雾系统工况参量,提高雾滴对靶标的有效沉积。     

油菜籽粒干物质来源的研究

本试验采用分部位去叶、遮光、环割果柄和测定茎枝的干物质积累等方法,研究了油菜的光合产物和贮藏物质对籽粒产量的影响,结果表明:(1)角果的光合产物是籽粒产量的主要来源,占2/3左右,其中果喙的光合产物约占籽粒产量的8％。(2)茎枝的光合产物对产量的贡献占13.5％,其中花序轴供给约5％。(3)茎枝中的贮藏物质对籽粒的灌浆结实     

江苏省棉花品种区域化试验技术研究进展

概括了近年来棉花品种区域化试验技术的研究进展：（１）进行了试点间相似性研究，调整了江苏省棉花品种区域试验的试点布局。（２）采用“环境”的方差分解方法，使联合方差分析简化、灵活，并充分利用试验信息，（３）在参试品种稳定性分析的研究中，提出区域试验精确度检验的新标准。（４）调整了区域试验的鉴定项目；研究了使用缩节安对区域试验结果的影响，引入了适度化调技术。     

苹果褐斑病的研究——Ⅱ 品种间抗病性差异与理化性状的关系

苹果品种间对褐斑病存在抗病性差异,且某些品种的抗病性在苗期和成株期表现不一致。寄主的抗病性与叶面角质层厚度和叶内全氮量成正相关,而与游离酚、可溶性糖、磷和钾的含量无关。感病后,寄主的水分代谢和能量代谢发生改变,游离酚产生积累。     

2010年广东沿海地区不同养殖模式下凡纳滨对虾携带WSSV和IHHNV的调查

2010年4月至12月间,对广东沿海地区凡纳滨对虾高位池精养、土池半精养和滩涂混养三种养殖模式中的17口池塘进行了采样,检测对虾携带对虾白斑综合症病毒(white spot syndrome virus,WSSV)和传染性皮下及造血组织坏死病毒(Infectious hypodermal and hematopoietic necrosis virus,IHHNV)状况。研究表明,养殖对虾均不同程度携带病毒,而且WSSV感染程度要大于IHHNV,养殖模式和养殖技术影响对虾感染病毒程度。水质生态调控技术和混养模式对对虾病毒性疾病控制有良好的作用,这为疾病的防治提供新的思路。