广东省果梅种质资源主要性状的鉴定评价

阐述了广东省果梅种质资源的果实主要性状、生物学特性和植物学特征(主要包括栽培类型、果形、果重、肉质、果实可食率、果实内含物、果核核尖尖度、果实成熟期、花、树型和抗病性等),结果表明:(1)广东果梅种质资源变异广泛,蕴含有大量可供生产利用的优良种质;(2)栽培上有白梅、青梅、红梅和黄梅4类;(3)成熟期4月上旬至5月上旬,为我国最早熟的品种群。并介绍了优良品种的选育和推广利用情况。     

山东黄瓜地方品种资源果实外观品质的评价

对山东黄瓜地方品种资源的瓜奈形状、皮色、刺、瘤、刺色、棱沟、瓜长、把长、横径、单瓜重、把瓜比、果型指数等12个果实外观性状进行了调查分析,结果表明,山东黄瓜地方品种资源果实外观性状具有丰富的遗传多样性,平均多样性指数为1．58。华北型种质果实外观性状的平均多样性指数高于华南型种质。根据生产上对果实外观性状的要求,对两种生态类型中优良种质资源进行了评价。从外观形态上筛选出各自的代表性种质,在两种生态类型中筛选了长瓜短把型种质和短重型种质,为资源的利用和品种的选育提供了信息。     

Limitations of In Vitro Strain Screening Methods for the Selection of Sclerotinia spp. as Potential Mycoherbicides against the Perennial Weed Ranunculus acris

Nineteen isolates of Sclerotinia sclerotiorum and three isolates of S. minor were inoculated on to excised tissues and intact plants of Ranunculus acris (giant buttercup), to evaluate their pathogenicity. All isolates proved pathogenic, with S. sclerotiorum being more pathogenic than S. minor on both excised tissues and intact plants. Seven of the S. sclerotiorum isolates were more pathogenic than the others on excised tissues, but no significant differences in pathogenicity were found between any of the isolates when they were inoculated on to intact plants. The results of this study indicate that the excised tissue method cannot be used to predict whole plant mortality, nor, therefore, the mycoherbicide potential of strains of S. sclerotiorum for this perennial weed.     

The effect of ecological management in the upper reaches of Heihe River

Heihe River is the second largest inland river in northwest China which flows through Qinghai Province, Gansu Province and Inner Mongolia Autonomous Region. Because of the rapid development of social economy, the sharp increase of water utilization in the middle reaches and the aggravation of contradiction of supply and demand on water resources, the water to the lower reaches decreases and the ecological environment deteriorates constantly. According to the severe situation of ecology system depravation in Heihe River basin, Chinese government decided to invest 2.35 billion RMB to carry out 3 years ecological management in Heihe River basin from August in 2001. After 3 years ecological management, the depravation of ecological environment is controlled effectively. This paper researches the ecological management engineering in the upper reaches of Heihe River and evaluates the effect of the ecological management engineering. The methods of field sampling and measuring are used to obtain the index indicating the ecology change in the upper reaches of Heihe River in 2006. The effects of fencing grassland, fencing natural forest, and artificial afforestation to the ecology are evaluated. The result suggests that: Firstly, in fencing grassland area, the yield of grass had increased by 42–113%, average height of the grass had increased by 60–100%, and the degree of coverage had increased by 67–100%. Secondly, in fencing natural forests area, the degree of coverage had increased by 15–33%, the shade density had increased by 50–100%, average height had increased by 80–125%, and the crown size had increased by 63–186%. Thirdly, the growth increment of the trees in artificial afforestation area is bigger than that outside artificial afforestation area. In conclusion, ecological management leads to obvious ecological effect in the upper reaches of Heihe River.     

玉米耐盐种质筛选及群体遗传结构分析

本研究采用盆栽法评价了157份玉米自交系的苗期耐盐性,并利用115对SSR标记解析了耐盐自交系的群体遗传结构。结果表明,T5V、N1026、农大1145及4S等10份玉米自交系为高耐盐玉米种质;处理后10d株高、地上鲜重、地下鲜重、地上干重、地下干重及存活率可作为玉米苗期耐盐鉴定的重要指标;利用SSR分子标记,结合系谱资料,将157份自交系划为6个类群,其中具有通系5血缘（Ⅰ类群）、泰国糯玉米种质血缘（Ⅲ类群）及旅大红骨、黄早四等血缘（Ⅵ类群）的自交系耐盐性较强,是开展玉米耐盐育种的重要种质类群。本研究筛选到的耐盐种质将为玉米耐盐遗传机制研究、玉米种质遗传改良及耐盐分子育种提供优异的基因资源。     

组织学与胚胎学数字化教学及考评模式的建立及应用

随着现代技术和信息技术的发展及其在高等学校教学领域中的广泛应用,利用现代网络技术,构建数字化网络多媒体教学平台已经成为新的教学理念。本文对建设适用于以学生自主学习为主导的数字化教学及考评模式进行了初步探讨。     

抗病高干甘薯地方资源的鉴定评价与育种利用

摘要：抗病高干甘薯地方资源的筛选是选育多抗、优质、高产甘薯新品种的基础。本文通过对收集的850份甘薯地方种资源进行抗病鉴定及品质分析：筛选出高干（干率≥30%）的资源材料71份,高干兼抗三病资源材料5份,高干兼抗两病资源材料23份,高干并抗一种病害的资源材料42份;通过对1981年以来育成的254个品种的亲本类型分析表明：85.8%的育成品种选用国内育成种（品系）作为亲本,18.5%的品种选用国外引进资源作为亲本,只有8.3%和0.78%的品种分别选用国内甘薯地方种和甘薯野生资源作为亲本。     

世界粮食和农业植物遗传资源保护与利用现状

本文根据联合国粮农组织2010年发布的<第二份世界粮食和农业植物遗传资源现状报告>[1]及相关资料,综述了全球粮食和农业植物遗传资源保护和发展现状,内容包括种质多样性概况、原生境保护、非原生境保护、评价与利用、国家计划与管理、国际和地区合作、获取与利益分享以及对粮食安全和可持续农业的贡献.文章最后分析了我国存在的差距,提出了加强粮食和农业植物遗传资源保护和发展的建议.本文数据较新,内容齐全,是资源管理者、保护者和利用者的重要参考材料.     

构建医学免疫学多元化互动式课堂教学评价体系的实践与探索

根据医学免疫学的特点和我国教学现状,设计了多种互动式教学方式,提高基础课的教学质量.在实施课堂教学过程中,评价问题仍将是影响其顺利实施的关键因素之一.对相应的评价应在一定层次上进行理论上的探讨和系统的构建,为今后全面实施多元化互动式课堂模式进行有益的尝试,也为全面实现素质教育提供良好的基础.     

A qualitative summative assessment for theater education

Abstract

This article reviews the development of a qualitative summative assessment based on the National Theater Standards to evaluate theater education classes. The authors examine the current state of the field of theater education; the use of the assessment; an overview of the results of an arts integration U.S. Department of Education project; and a look at some of the student work. Finally, the article considers some of the complications and challenges that can arise from this type of process.