原子吸收光谱法测定隆回产富硒大米中的硒含量

探索了隆回产富硒大米的消化条件,建立了其中微量硒的流动注射氢化物发生-原子吸收光谱测定方法.实验结果表明,每2g样品中加入6mLHNO3和2mLH2SO4可消化完全,硒元素在0￣0.030μg/mL范围内有良好的线性关系,相关系数为0.9987,平均加标回收率94.26%,RSD=3.64%,方法的检出限为1.92ng/mL,定量限为6.4ng/mL.该方法操作简便、快速,灵敏度高,应用于隆回产大米样品中硒的测定,获得满意结果.     

资阳市特色效益农业的特点及发展对策探讨

本文介绍了资阳市特色效益农业的特点,简要分析了发展中存在的主要问题,提出了进一步发展特色效益农业的思路、目标和对策建议。     

农业软件研发的障碍分析与发展重点研究

首先分析了河北省农业信息化的现状,调研了农业信息化的需求,进而分析了影响农业软件研发的因素,提出了开展农业软件研发的策略和发展重点。认为在进一步完善农业信息基础设施的同时,建立政府扶持、科研与教育机构为主要研发者、与农户(公司)相结合的研发与推广体系,根据国情,以政府引导、市场需求为导向,以开发农业信息化软件产品为突破口,利用效益来改变农民对农业软件需求的认识,进而全面开展各类农业软件的研究开发和推广,这将有利于建立节约、高效、持续农业,提高农民收入和农业技术及装备水平,加速实现农业现代化。     

农产品需求结构变化对农业产业结构调整的影响--以贵州毕节地区为例

以经济学需求收入弹性理论为支撑,选定贵州省最贫困地区之一的毕节地区作为研究区域,分析了农产品需求结构变动对毕节地区农业产业结构调整的重大影响。分析认为,从买方市场角度出发,毕节地区农业产业结构调整方向为:农林牧渔结构中,应以畜牧业作为主要发展方向;种植业结构中,应在稳定粮食生产的基础上,加强蔬菜和油料作物的生产;畜牧业结构中,应以牛、羊等草食性畜产品作为发展方向,同时加强发展收入需求弹性系数高的家禽业;加快食品加工业的发展。     

可溶性水稻凝集素与水稻稻瘟病关系的研究

以水稻的７ 个鉴别品种为材料,对可溶性水稻凝集素与水稻稻瘟病的关系进行了研究结果表明７ 个鉴别品种,不论抵抗或感染稻瘟病品种的稻胚凝集素都有较高的凝集活性（２５～２８）,在ＳＤＳＰＡＧＥ中都呈４ 条带,且位置相同在水稻的不同生长期,可溶性水稻凝集素活性均测不到稻瘟病菌分生孢子表面结构检测结果表明,稻瘟病菌分生孢子壁表面糖外被是半乳糖,可溶性稻胚凝集素是与Ｎ乙酰葡萄糖胺专性结合以上结果说明可溶性水稻凝集素与稻瘟病抗性无关     

Starch RVA profile parameters of rice are mainly controlled byWx gene

Quantitative trait locus (QTLs) mapping for rapid visco analyser (RVA) profile parameters has been carried out by using a double haploid (DH) population derhred from a cross betweenindica variety Zhai-Ye-Qing 8 andjaponica variety Jing-Xi 17 and its genetic linkage map. The results indicate that the segregation of the RVA profiles is continually distributed among the DH lines, and some DH lines show transgressive segregation for all the parameters. A major QTL,Waxy (Wx) gene on chromosome 6 which controls the amylose synthesis, has been detected significantly for 5 traits: hot paste viscosity (HPV), cool paste viscosity (CPV), breakdown viscosity (BDV), consistency viscoslty (CSV) and setback viscoslty (SBV). Therefore, the RVA profile parameters are mainly controlled byWx gene. Other 3 and 2 QTLs have also been identified for BDV and SBV, respectively, and two of them share the same region on chromosomes 1 and 5. However, the peak viscosity (PKV) is controlled by a minor QTL on chromosome 12, qPKV-12.     

Tagging major quantitative trait loci for sheath blight resistance in a rice variety, Jasmine 85

This study was conducted with a clonal F₂ population of rice from a cross between Jasmine 85, a resistant variety, and Lemont, a susceptible cultivar. The rice plants belonging to each F₂ clone were divided into two plots, which were put in two replicates, respectively. Clonal parents were tested as controls. The plants were inoculated by short toothpicks incubated with RH-9, a virulent isolate of the pathogenic fungus,Rhizoctonia solani, which causes rice sheath blight. The extreme resistant and susceptible clonal lines were selected for construction of resistant and susceptible DNA pools, respectively. A total of 94 polymorphic markers evenly distributed on 12 rice chromosomes were used for bulked segregant analysis, three positive ones were found polymorphic between the two DNA pools, and three major QTLs for sheath blight resistance, Rh-2, Rh-3 and Rh-7, were identified. The three major QTLs were located on chromosomes 2, 3 and 7, and could explain 14.4%, 26.1% and 22.2% of the phenotypic variation.     

Release of active oxygen from phytopathogenic bacteria and their regulation

Some phytopathogenic bacteria including Xanthomonas oryzae pv. oryzae (a rice leaf bacterial blight pathogen) and its virulent gene mutant XooM3105, Xanthomonas campestris pv. campestris, Erwinia carotovora subsp. carotovora and so on, could release active oxygen such as O2 and H2O2 by themselves. Ca2+ , NADPH and O2 concentration regulated the response. The response is sensitive to heat and proteinase. These results show that the component releasing active oxygen in the bacterial plant pathogen may involve special protein and enzyme and be secreted to culture liquid. Various components of rice tissue can significantly induce the release of active oxygen in Xan-thomonas oryzae pv. oryzae.     

时域反射仪及其在节水农业研究中的应用

文中简要介绍了时域反射仪（ＴＤＲ）及其测定土壤水分的原理、特点和使用技术。根据在室内模拟滴灌土壤水分移动规律和田间微孔地膜渗水性能研究中应用ＴＤＲ测定土壤水分的两个试验,探讨了ＴＤＲ在节水农业研究中应用的优势。     

粉煤灰综合利用的现状与前景展望

从降低粉煤灰对环境污染和将其变废为宝的角度,综述了国内外对粉煤灰综合利用的现状,并具体介绍了粉煤灰在建材制品、化学工业、农业以及环境保护等领域应用中的研究热点,提出了大量的可行方案,为粉煤灰综合利用的全面推广奠定了一定的理论基础。另外还对粉煤灰应用中面临的问题提出了一些应对措施,最后对粉煤灰今后应用的重点作了展望。