Old and New Cultivars of Soya Bean (Glycine max L.) Subjected to Soil Drying Differ in Abscisic Acid Accumulation,Water Relations Characteristics and Yield

Two old (Huangsedadou and Longxixiaohuangpi (LX)) and two new (Jindou 19 (JD) and Zhonghuang 30 (ZH)) soya bean (Glycine max (L.) Merr.) cultivars were used to investigate the influence of soil drying on the abscisic acid (ABA) accumulation in leaves, stomatal conductance (g_s), leaf water relations, osmotic adjustment (OA), leaf desiccation tolerance, yield and yield components. The greater ABA accumulation was induced by soil drying, which also inducing g_s decreased at higher soil water contents (SWC) and leaf relative water content (RWC) significantly decreased at lower SWC in the new soya bean cultivars than in the old soya bean cultivars. The soil water threshold between the value at which stomata began to close and the RWC began to decrease was significantly broader in the new cultivars than in the old cultivars. The new cultivars had significantly higher OA and lower lethal leaf water potential than old cultivars when the soil dried. The old cultivars had greater biomass, but lower grain yield than the new cultivars in well‐watered, moderate stress and severe stress conditions. Thus with soil drying, the new soya bean cultivars demonstrated greater adaptation to drought by inducing greater ABA accumulation, stomatal closure at higher SWC, enhanced OA and better water relations, associated with increased leaf desiccation tolerance, greater water use efficiency and higher yield.     

银川盆地富硒土地资源研究

在银川盆地首次发现大面积富硒区.该富硒区具有富硒土层厚、硒含量适中、宜于开发利用等特点.富硒土地分布区不仅硒含量高,而且污染有害元素的含量特别低,呈"原生态"的自然状态.初步分析认为银川盆地土地富硒主要与成土母质(母岩)有关.     

黑龙江省西部地区跨区域引种品种桑试验

为了探索跨区域引种品种桑在黑龙江省西部半干旱地区适应性和推广可能性,先后从吉林省白城市林科院、黑龙江省蚕业研究所引进了7个桑树优良品种,在黑龙江省森林与环境科学研究院绿源科技示范基地进行了栽植试验。经过5年的栽植试验对比,结果表明,辽鲁11号和藤选1号2个引进桑树优良品种,具有抗寒性强、生长量大、粗蛋白含量高、产叶量大等特点,可作为黑龙江省西部半干旱地区饲料桑主栽树种引种栽植。     

大豆品种间DNA限制性片段长度多态性（RFLP）的分析

用６２个大豆ＤＮＡ分子探针与５种限制性内切酶组合，对大豆基因组ＤＮＡ限制性片段长度多态性（ＲＦＬＰ）进行分析，结果表明，所选用的两对材料，其多态性ＲＦＬＰ标记的频率均高达６０％，可作为ＲＦＬＰ作图较理想的亲本，ＲＦＬＰ标记的多态性类型表现为共显性，少数为显性，其中一些标记揭示了２个或２个以上的独立分离的基因座位，不同限制性内切酶的揭示多态性的能力上差异不显著，在杂交片段长度上差异显著并都大于预期，     

家兔发情状态与受胎率和产仔数关系的研究

本文研究了家兔的发情状态与配种后的受胎率，以及产仔数之间的关系。以家兔阴粘膜颜色作为表观指标，将家兔的发情分为５个状态，其相应的阴粘膜颜色分别为：苍白、粉色、红色、大红、黑紫。经促排２号诱发排卵后，人工授精，相应状态下的受胎率为：２９．５％、４２．９％、５６．８％、５３．８％、２５．０％；相应状态下的平均产仔数分别为：５．５４、６．６９、６．６２、７．２１、５．５２。用促排３号处理后，相应状态下的受胎率为：９．０％、４３．２％、５３．２％、７０．０％、２１．７％。结果表明：无论是用促排２号，还是用促排３号处理，当阴粘膜颜色为苍白和黑紫时的受胎率或产仔数，都显著地低于或少于阴粘膜颜色为粉色、红色、大红时的受胎率（Ｐ＜０．０１）或产仔数（Ｐ＜０．０５）。说明，家兔的发情状态与配种后的受胎率和产仔数有密切的相关     

The pathology of heartwater. I. A study of mice infected with the Welgevonden strain of Cowdria ruminantium

Gross and microscopical lesions in mice intravenously infected with the Welgevonden strain of Cowdria ruminantium closely resembled the lesions described in cattle, sheep and goats. A high concentration of organisms was present in alveolar endothelial cells. Cytopathic changes in parasitized and non-parasitized endothelial cells and the morphology of the organisms are described and compared with the Ball3 strain of C. ruminantium. Possible mechanisms in the development of the lung oedema are considered and the role of mice as animal model is discussed.     

6例奶牛子宫扭转的诊断与治疗

奶牛子宫扭转是发生于妊娠期的一种常见的难产性疾病,通常妊娠子宫沿自身纵轴发生一定角度的扭转。轻度的子宫扭转(≤90°)多发生于妊娠早期和中期,多可自行恢复;但严重的子宫扭转多发生于妊娠后期,通     

乳酸芽孢杆菌制剂对AA肉鸡生产性能的影响

本试验研究在日粮中分别添加200mg/kg乳酸芽孢菌制剂和50mg/kg土霉素,对1～49日龄AA肉鸡生产性能的影响。结果表明,乳酸芽孢菌制剂组和土霉素组的全期平均日增重比对照组提高15.29%和9.10%(P<0.05),乳酸芽孢菌制剂组比土霉素组提高5.67%(P>0.05);乳酸芽孢菌制剂组和土霉素组的全期料肉比分别比对照组降低9.09%和7.36%(P<0.05),乳酸芽孢菌制剂组比土霉素组低1.87%(P>0.05);各组成活率差异不显著。