Screening and Verification of Low Nitrogen Tolerant and Nitrogen Sensitive Cotton Germplasm

[Objective] The aim of this study is to evaluate nitrogen efficient cotton germplasms and improve nitrogen use efficiency. [Method] Eighty cotton germplasms were selected and evaluated in the hydroponic experiment under low (0.25 mmol·L^－1) and high (5 mmol·L^－1) nitrogen concentration. Different traits for screening were identified and nitrogen use efficiency types were classified. Field experiments were also performed for comparison and confirmation of the identified germplasms. [Result] The results showed that there were significant differences in the total plant dry matter, shoot nitrogen accumulation and nitrogen absorption efficiency in cotton germplasms at the two nitrogen levels. Based on coefficient of variation, principal component analysis and correlation, six traits including total plant dry matter, shoot dry matter, root dry matter, total nitrogen accumulation, shoot nitrogen accumulation and nitrogen absorption efficiency were used as screening indicators. According to the Heatmap clustering analysis and the nitrogen efficiency comprehensive index, two germplasms (Lu05R59 and CCRI 69) were identified as low nitrogen tolerant and nitrogen efficient, and two germplasms (Coker 201 and Xinluzhong 30) as low nitrogen sensitive and nitrogen inefficient. The results of field experiment were consistent with the results of the hydroponic culture at the seedling stage. [Conclusion] It was finally determined that Lu05R59 and CCRI 69 were the low nitrogen tolerant and nitrogen efficient germplasms, and Coker 201 and Xinluzhong 30 were low nitrogen sensitive and nitrogen inefficient germplasms. The results of these studies provide the possibility for screening and rapid identification of nitrogen use efficiency in cotton at the seedling stage, and provide the ideal materials and theoretical basis for further study of cotton nitrogen efficient.     

高产、抗病转基因抗虫棉品种——中棉所94A915

概述了中棉所94A915的选育经过、特征特性，并总结了其关键栽培技术。     

单胚甜橙优系—王字4号的生物学特性及经济性状研究

王字４号是四川新胜茶场选出的甜橙（ＣｉｔｒｕｓＳｉｎｅｎｓｉｓ）优良单株，具果大、质优、少核、晚熟、较耐低温等综合优良性状。特别是单胚率高而稳定，１９９０—１９９２年镜检，单胚率分别为９８．１５％、９５．６％、９７．７％。     

谏壁发电厂泵站改造实践

为解决渣浆泵在运行时轴封水供应困难的问题，计算了谏壁发电厂松林山泵站的装置特必,天详细分析论证的基础上，确定了泵站的改造方案，进行了叶轮的优化设计。     

Alternative complement pathway in bovine serum: lysis of human erythrocytes.

The hemolysis of unsensitized human erythrocytes by fresh bovine serums was investigated. Lysis occurred in ethylene glycol bis-amino tetraacetate buffers and with serums depleted of Clq. Serums extensively absorbed with packed human erythrocytes at 0 C effectively lysed human erythrocytes, but optimal lytic capacity required target cells "sensitized" with a heat-stable serum factor. Lysis did not occur with serums absorbed with zymosan at 17 C or heat inactivated at 50 C. These results indicate that human erythrocytes can activate the alternative pathway of complement in bovine serums. Lysis can proceed in the apparent absence of antibodies, although their presence may enhance the reaction.     

盐胁迫对黄瓜幼苗渗透调节物质含量的影响

土壤盐渍化制约作物生育，同时也是作物品质劣变的主要因素之一。近年来由于环境保护措施的滞后，不科学的施肥及土壤管理，导致土壤次生盐渍化现象越来越严重。渗透调节物质在细胞中积累能够提高细胞渗透调节能力，稳定其内大分子蛋白生物膜的结构和功能。研究盐胁迫下渗透调节物质含量的变化规律可以了解其与耐盐性的相关性。本试验研究了盐胁迫对黄瓜幼苗几种渗透调节物质含量的影响，以期为黄瓜耐盐育种提供理论依据。     

茄子新品种蒙茄4号的选育

蒙茄 4号是以 86D0 1 1 1 1为母本 ,79B0 1 2 2 2为父本配制的一代杂种。该品种中早熟 ,始花节位第 7～ 8节。果实近圆形稍扁 ,果皮深紫色 ,光泽度强 ,耐贮运 ,果肉紧密 ,商品性好。平均单果质量 4 0 0～ 4 5 0g,露地每6 6 7m2 产量 4 5 0 0kg左右。适宜露地栽培。     

猕猴桃新品种‘中猕1号’

 ‘中猕1号’是从河南伏牛山区野生资源中选出的猕猴桃新品种，结果早，丰产，抗逆性强，果实大，品质优，果肉绿色，果心小，种子少，味甜，有浓郁清香味。     

基于GIMMS NDVI 3g.v1的近34年青海省植被生长季NDVI时空变化特征

在气候变化和人类活动的综合影响下,青海省生态环境发生了明显变化。在此背景下,以GIMMS NDVI 3g.v1为数据源,采用Sen+Mann-Kendal方法研究青海省1982-2015年植被覆盖区域NDVI时空变化,将趋势分析和R/S(rescaled range analysis)分析叠加,研究植被生长季NDVI变化的持续性特征,并揭示植被对气候变化及人类活动的响应规律。结果表明:1)近34年青海省植被NDVI整体呈从西北到东南的增加趋势;且变异系数显示,波动性较大地区集中在柴达木盆地周边和青南牧区西北部等植被NDVI较低的区域,波动性较小地区集中在祁连山东部、东部农业区和青南牧区东南部等植被NDVI较高的区域。2)近34年青海省植被NDVI整体呈增加趋势,增长率为0.38%·10a~(-1);且NDVI变化具有明显的阶段性,存在1994年和2000年两个突变点。3)近34年青海省植被改善区域(75.4%)远大于退化区域(24.6%),其中显著改善面积占植被覆盖区域面积的40.9%,退化区随时间变化在空间上表现出明显的转移现象。4)Hurst指数表明,青海省植被变化反持续性较强,趋势分析与Hurst指数叠加得出,由退化转为改善的区域占植被覆盖区面积的13.7%,由改善转为退化的区域占植被覆盖区面积的44.3%,另41.5%的区域无法确定未来变化趋势。5)青海省植被生长季NDVI受气候变化和人类活动的双重影响,且不同植被类型对气候变化的响应存在较大差异。     

欧盟国家非洲猪瘟流行情况及对我国防控工作的启示

非洲猪瘟(ASF)1957年首次扩散到欧洲,2014年再次从高加索地区传入,并迅速在波罗的海周边国家蔓延,至2018年4月已扩散至欧盟8个成员国,且逐渐呈现地方性流行态势。本文重点介绍了欧洲国家的ASF扩散史,综述了病毒在欧盟国家扩散的主要途径,梳理了欧盟的ASF防控法规和措施,并对我国ASF防控提出了建议,以期为ASF防控提供帮助。