小麦遗传率中潮霉素适宜筛选浓度的研究

研究了潮霉素不同质量浓度对西农 1376和京花 1号小麦愈伤组织及种子的筛选效果。结果表明 ,潮霉素对小麦愈伤组织的适宜筛选质量浓度为 110 mg/L,对转基因小麦后代种子筛选以 14 0 mg/L 较为适宜 ;不同基因型材料对潮霉素的敏感性存在一定差异     

新杀虫剂HNPC-A9908对蛋白核小球藻生理生化特性的影响

以蛋白核小球藻为材料，采用室内植物生长箱培养方法，研究了HNPC—A9908[O-(3一苯氧苄基)-2-甲硫基-1-(4-氯苯基)丙基酮肟醚]对小球藻细胞的致毒机理。结果表明，低浓度时HNPC—A9908对蛋白核小球藻蛋白质含量具有刺激增加的作用；随着浓度的加大，藻细胞蛋白质含量逐渐降低。同时藻细胞超氧化物歧化酶(SOD)和过氧化物酶(POD)活性也表现出类似的趋势，说明SOD和POD活性的降低打破了小球藻细胞内活性氧产生与清除之间的正常平衡状态，是HNPC—A9908造成藻细胞活性氧过量产生和积累，进而引起藻细胞膜脂过氧化伤害的主要原因之一     

作物品种区域试验多年资料联合分析法的应用

用作物品种区域试验多年资料联合分析方法的计算机程序对 2 0 0 1～ 2 0 0 2年度国家玉米品种区域试验的部分资料进行分析。结果表明 ,该程序不仅可以进行方差分析 ,而且可以计算品种、试点和品种试点组合的最小二乘均数 ,并可对其差异显著性进行检验。     

Lysine, Methionine and Tryptophan Requirements of Beijing Ducklings of O-2 Weeks of Age

A feed trial was conducted with a total of 1 134 Beijing ducklings to study the optimum level of dietary lysine (Lys) (0.95,1.10, 1.25%), methionine (Met) (0.26, 0.46, 0.66%) and tryptophan (Trp) (0.20, 0.30, 0.40%) for those ducklings during aphase of 0-2 weeks. Ducklings were randomly allotted to 27 groups according to a 3 × 3 × 3 factorial arrangement and fed a basal corn-soybean-peanut meal diet containing 20.26% CP, 12.45 MJ kg-1 ME. The results from this study indicate that Lys affected body weight (P＜0.01), feed intake (0-14 d) (P＜0.01), but had no effect on feed/gain (0-14 d) (P＞0.05), uric acid concentration (P ＞ 0.05). Methionine influenced body weight (P ＜ 0.01), feed/gain (P ＜ 0.05), and feed intake (P ＜ 0.01). Tryphtophan had no effect on indices measured. The requirement of the Lys and Met for Beijing ducklings of 0-2 weeks of age were 1.10 and 0.46%. The requirement of Trp for Beijing ducklings of 0-2 weeks of age was not more than 0.20%.     

水分和钾肥对冬小麦旗叶光合特性的影响

为明确灌水与施用钾肥之间的互作效应,本研究采用不同灌水次数与钾肥用量设计,研究了灌水与钾肥施用对旱地冬小麦后期生长及籽粒灌浆的影响.结果表明,适当的灌水次数及钾肥投入,能提高旱地冬小麦旗叶的叶绿素含量、光合速率及小麦籽粒千粒重;灌水与施用钾肥之间有一定互作效应.     

渭北扁桃果实生长曲线和品质测定

观察测定了渭北地区引进的3个扁桃品种果实生长动态。结果表明,品种间果实发育所需天数虽然不相同,但果径增长都表现单“S”型生长曲线。依据生长速度,可将果实生长过程划分为3个时期,生长速率第2期>第1期>第3期,累积生长量第1期>第2期>第3期,总体表现为前期果实增长迅速,后期缓慢。3个品种的种子大小基本保持了品种的原有特性,种仁营养含量高。     

基于遥感和GIS的黄河三角洲淤蚀动态研究

采用遥感和地理信息系统 (GIS)技术 ,研究黄河三角洲地区 1976 - 0 6～ 1998- 0 5淤积与侵蚀面积的动态变化 ,通过对不同时相遥感图像的解译提取其水陆界线 ,在 GIS支持下对黄河三角洲地区的水陆边界进行比较 ,确定侵蚀区与淤积区 ,并计算其面积。结果发现 ,黄河三角洲地区 1976 - 0 6～ 1981- 0 9年净增面积最大 ,平均每年增加 2 90 8.2 75 hm2 ,1989- 11～ 1992 - 0 9年净增面积最少 ,仅为 5 13.5 98hm2。总的来看 ,黄河三角洲的淤积速度呈现为递减的趋势 ,主要的淤积区为黄河入海口处 ,侵蚀区为河口北部和东部沿海地区。     

部分新疆杏品种水不溶性固形物含量的测定

水不溶性固形物含量是杏干制备的一项重要指标。以14个华北杏为对照,研究了33个新疆杏品种的水不溶性固形物含量。结果表明,两大品种群的杏水不溶性固形物含量在总体上差异不明显,水不溶性固形物含量在品种间有明显差异。在新疆杏中,赛来克佳娜丽、卡巴克胡安娜、托户地库都、卡巴克西米西的水不溶性固形物含量均高于是2.5%,是比较理想的制干品种。不同成熟期的杏水不溶性固形物含量存在显著差异,研究表明从中熟品种群中选择高水不溶性固形物含量的品种最为有效。另外,采摘期也明显影响水不溶性固形物含量,制备杏干宜在八成熟时采摘。     

Changes of Endogenous Hormone Contents in Fruit, Seeds and Their Effects on the Fruit Development of Rosa roxburghii

The fruit of cultivar Guinong5 (Rosa roxburghii Tratt. ) was used to investigate the regularity of its growth and development, and the changes of endogenous hormone contents during the period of the growth and development. The result showed that contents of GA1+3, IAA and ZRs in the flower receptacle of young fruit were high and then decreased, contents of GA1+3 and IAA in seeds increased with its development until maturity. The contents of ZRs and ABA in the flower receptacle of young fruits and seeds were high, and then had a tendency of descent with the development of fruits. The contents of GA1+3, IAA, ZRs and ABA in flower receptacle of young fruit with normal fertilization were much higher than those of in non-fertilization fruits. In the flower receptacle of malformed fruits, the contents of GA1+3, IAA and ZRs in normally developing flower receptacle were significantly higher than those in malformed fruits. The growth and development of fruits depended largely on the seeds, development because the seeds in the fruits with non-fertilization failed to be formed or even formed but irreproducible, which would lead to the decrease of GA1+3, IAA contents and the abnormal development of fruits. Therefore the fruits deformed and dropped inevitably.     

罗非鱼"突眼"病细菌性病原的分离与鉴定

从患"突眼"症状的罗非鱼体内分离到多株细菌,经人工感染证实其中TL60829NA菌株为病原菌,经生理、生化和API细菌鉴定系统以及分子生物学试验,鉴定其为痢疾志贺氏菌(Shigella dysenteriae)。其主要生理生化特征为革兰氏阴性短杆菌,不具动力,氧化酶、过氧化氢酶、V-P反应、吲哚试验、苯丙氨酸、甘露醇、KCN均为阴性;对氨苄西林、羧苄西林、红霉素、多西环素、氟哌酸、卡那霉素敏感,对呋喃唑酮、复方新诺明、磺胺和庆大霉素不敏感。