籼稻品种对三个白叶枯病菌系的抗性遗传分析     

施爱农  章琦 《华中农业大学学报》1993,12(3):215-220

分析和研究了全生育期表现抗病的5个籼稻品种二九丰、三黄占2号、川植5号、扬稻1号和83007对3个水稻白叶枯病菌系HB84-17、PXO16和T7174的抗性遗传,对这5个抗病品种分别与感病品种沈农1033或金刚30杂交的F_1、F_2和B_1F_1群体植株对供试3个菌系的抗性反应和分离世代植株抗感分离比例的分析结果表明:供试的5个籼稻抗病品种对菌系HB84-17和PXO61的抗性均由一对显性基因控制,对菌系T7174的抗性均由二对独立遗传的显性基因控制,其中一对能控制对这3个菌系的抗性,另一对只控制对菌系T7174的抗性而对菌系HB84-17和PXO61表现为感病。  相似文献   

太湖流域殷村港沉积物中营养元素及重金属污染特征研究   总被引：2，自引：2，他引：2  

牛勇  余辉  牛远  刘倩  逄勇  徐向阳 《农业环境科学学报》2015,34(8):1557-1562

2012年8月沿殷村港共采集17个样点表层沉积物样品,分析了其中的营养元素及重金属含量。结果表明:殷村港沉积物中TN、TP和TOC含量均值分别为2.11、1.56、27.75 g·kg^-1,沉积物中TOC与TN环境行为近似,说明TN的沉积与有机物的沉积相伴随;C/N及营养元素评价表明殷村港外源污染输入显著,有机氮污染严重;地累积指数评价显示殷村港Cu污染水平处于"中-强"污染等级,其次是Pb及Zn处于中度污染,Cr及Ni基本属于无污染状态。  相似文献   

黄鳝排尿器官的解剖学研究     

曾增  刘希彬  吴峻岩  李琦  谢从新  杨春 《华中农业大学学报》2002,21(1):72-76

应用铸型技术等方法研究了黄鳝排尿器官的解剖学结构。结果见到,黄鳝2条中肾管在中肾末端与所谓退化性腺（亦即膀胱）相连,并与该“退化性腺”之间存在着明显的通道关系,而“退化性腺”直接通于尿孔。此外,组织学的研究也支持了解剖学结果,并证实中肾管在“退化性腺”中存在着2种开口类型;单口型和双口型。研究结果为作者先前提出的有关黄鳝“退化性腺”是膀胱的结论提供了直接的形态学证据。  相似文献   

凡纳对虾小触角表面结构的显微观察   总被引：3，自引：0，他引：3  

曾嶒  戴立贤  刘永红  李红  李琦  王珺 《华中农业大学学报》2002,21(4):371-378

应用光学显微镜和扫描电子显微镜观察了凡纳对虾小触角的表面结构。结果发现：小触角上广泛着生着700根以上的羽状刚毛；外鞭片状隆起腹面平均约具280根无顶孔但有细分支的化感刚毛，这类有分支的化感刚毛在其它十足目种类上未见有报道，而且其刚毛数也较其它种类少；内侧附肢前端与柄节上直立的羽状刚毛毛簇顶相接触，推测该结构可能对相邻的复眼具某种作用。  相似文献   

Reduced tillage with residue retention improves soil labile carbon pools and carbon lability and management indices in a seven-year trial with wheat-mung bean-rice rotation     

Rafeza BEGUM  Mohammad M. R. JAHANGIR  Mohammad JAHIRUDDIN  Mohammad Rafiqul ISLAM  Shaikh M. BOKHTIAR  Khandakar R. ISLAM 《土壤圈》2022,32(6):916-927

Soil total organic carbon (TOC) is a composite indicator of soil quality with implications for crop production and the regulation of soil ecosystem services. Research reports on the dynamics of TOC as a consequence of soil management practices in subtropical climatic conditions, where microbial carbon(C) loss is high, are very limited. The objective of our study was to evaluate the impact of seven years of continuous tillage and residue management on soil TOC dynamics (quantitative and qualitati...  相似文献   

Soil texture affects the conversion factor of electrical conductivity from 1:5 soil-water to saturated paste extracts     

Bo-Seong SEO  Young-Jae JEONG  Nu-Ri BAEK  Hyun-Jin PARK  Hye In YANG  Se-In PARK  Woo-Jung CHOI 《土壤圈》2022,32(6):905-915

Electrical conductivity(EC) of soil-water extracts is commonly used to assess soil salinity. However, its conversion to the EC of saturated soil paste extracts(ECe), the standard measure of soil salinity, is currently required for practical applications. Although many regression models can be used to obtain ECe from the EC of soil-water extracts, the application of a site-specific model to different sites is not straightforward due to confounding soil factors such as soil texture. This study was...  相似文献   

Spectral indices measured with proximal sensing using canopy reflectance sensor, chlorophyll meter and leaf color chart for in-season grain yield prediction of basmati rice     

VARINDERPAL-SINGH  KUNAL  MEHTAB-SINGH  BIJAY-SINGH 《土壤圈》2022,32(6):812-822

A number of optical sensing tools are now available and can potentially be used for refining need-based fertilizer nitrogen (N) topdressing decisions.Algorithms for estimating field-specific fertilizer N needs are based on predictions of yield made while the crops are still growing in the field.The present study was conducted to establish and validate yield prediction models using spectral indices measured with proximal sensing using GreenSeeker canopy reflectance sensor,soil and plant analyzer ...  相似文献   

Effects of silver nanoparticle size, concentration and coating on soil quality as indicated by arylsulfatase and sulfite oxidase activities     

Yutong XUE  Prashank MISHRA  Frieda EIVAZI  Zahra AFRASIABI 《土壤圈》2022,32(5):733-743

Recently, the nanotechnology industry has seen a growing interest in integrating silver nanoparticles(AgNPs) into agricultural products, which increases soil exposure to these particles. This demands an investigation into the effect of AgNPs on soil health. Changes in soil enzyme activities upon exposure to AgNPs can serve as early indicators of any adverse effects that these particles may have on soil quality. This study aimed to determine the effects of AgNP size, concentration, coating, and e...  相似文献   

Effective alleviation of Cd stress to microbial communities in mining reclamation soils by thiourea-modified biochar amendment     

Yanfeng ZHU  Jing MA  Fu CHEN  Ruilian YU  Gongren HU  Yongjun YANG 《土壤圈》2022,32(6):866-875

Reclaimed soils in mining area usually display low fertility and present Cd stress. The amendment of modified biochar effectively fixes Cd in soils,enhances soil fertility, and reduces Cd stress in soil microorganisms. However, the effect of thiourea-modified biochar(TBC) on microbial adaptability to Cd stress in mining reclamation soils is still unclear. The present work studied the Cd immobilization and microbial community changes in a mining reclamation soil displaying extreme Cd contaminatio...  相似文献   

Comparison of sampling designs for calibrating digital soil maps at multiple depths     

Yakun ZHANG  Daniel D. SAURETTE  Tahmid Huq EASHER  Wenjun JI  Viacheslav I. ADAMCHUK  Asim BISWAS 《土壤圈》2022,32(4):588-601

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