大豆对紫斑病抗性鉴定方法的研究     

朱振东  李怡琳  邱丽娟  李向华  常汝镇  韩春雨 《大豆科学》2002,21(2):96-100

本研究通过自然发病和人工接种鉴定了不同大豆品种对紫斑病的抗性，旨在建立大豆对紫斑病抗性鉴定方法，为大豆品种资源抗性筛选创造条件。对不同成熟期的37个大豆品种在自然条件下对紫斑病的抗性调查结果表明，大豆紫斑病的发生受气候条件、大豆成熟期和品种抗性的影响，由于避免了病害发生的有利时期，晚熟大豆品种紫斑病发生很轻或不发病。1998年和1999年，分别在防虫网室和温室人工接种鉴定45份大豆种质，两次的鉴定结果均表明大豆品种间对紫斑病的抗病性存在显著差异，但在温室条件下大豆紫斑病平均病情指数显著低于网室条件下的试验结果。为提高大豆对紫斑病抗性鉴定的准确性，建议不同成熟期的品种同期鉴定时可对早熟品种进行摘花，保证接种时接种荚荚龄一致；对接种荚进行标记；设立高感对照；鉴定为抗病的材料进行重复鉴定。  相似文献   

不同品种马铃薯的颗粒全粉功能品质分析     

朱新鹏  郭全忠 《保鲜与加工》2015,15(4):62-65

以相同条件下生产的7个品种马铃薯为原料,测定其品质指标(干物质、总淀粉、直链淀粉、还原糖、VC)和加工全粉的功能指标(蓝值、持水性和持油性),研究不同品种马铃薯及其所制颗粒全粉功能品质的差异。结果表明,除费乌瑞它品种马铃薯的干物质含量偏低外,其余6个品种秦芋30、秦芋32、0406-1、0406-9、安薯56、鄂5均符合加工全粉的要求;马铃薯原料中总淀粉含量高,则游离淀粉的含量相对较高。7个品种马铃薯全粉的蓝值顺序为:安薯56费乌瑞它鄂5秦芋320406-9秦芋300406-1;持水性顺序为:秦芋32鄂5秦芋300406-9费乌瑞它0406-1安薯56;持油性顺序为:0406-1安薯56鄂5费乌瑞它=秦芋32秦芋300406-9。该结果可为马铃薯颗粒全粉生产的原料选择和全粉应用提供参考依据。  相似文献   

酸性染料比色法测定断肠草总生物碱的含量   总被引：4，自引：1，他引：4  

陈志慧  宋光泉  周家容 《江西农业大学学报》2006,28(3):440-443

建立了断肠草总生物碱含量的酸性染料比色测定法,并考察了各种因素对测定结果的影响。以溴甲酚绿作为测试用酸性染料,在总生物碱与其形成稳定络合物时间范围内,利用比色法测定了断肠草总生物碱的含量。此方法快速简便、准确易行。  相似文献   

蓝光对黄化小麦幼苗NO3^—吸收及硝酸还原酶活性的影响   总被引：1，自引：0，他引：1  

余让才  范燕萍 《华南农业大学学报》1996,17(3):70-74

研究了蓝光对黄化小麦幼苗ＮＯ－３吸收，植株ＮＯ－３含量及叶片硝酸还原酶活性的影响．结果表明，蓝光促进幼苗对ＮＯ－３的吸收，提高幼苗中的ＮＯ－３含量及硝酸还原酶活性，其作用均比红光和白光强．蓝光可能通过促进幼苗对ＮＯ－３的吸收和转运并增大ＮＯ－３代谢库而提高硝酸还原酶的活性．  相似文献   

双胍盐对柑桔青霉病防治效果试验     

刘冠民  黄斌 《湖南农业大学学报(自然科学版)》1991,(3)

两年的抑菌、刻伤接种和果实贮藏试验表明,双胍盐对柑桔青霉病的防治效果与伊迈唑相接近,可作为苯并咪唑类的替换药剂。  相似文献   

TiO2/AC负载型光催化剂的制备及光催化性能的研究   总被引：2，自引：0，他引：2  

谢倩  赵秀兰 《西南大学学报(自然科学版)》2011,33(3)

利用X射线衍射仪(XRD)和扫描电子显微镜(SEM),对溶胶-凝胶法中不同煅烧温度条件下合成的TiO2/AC负载型光催化剂的表面形貌、分布均匀性、粒径大小及晶型等进行了表征;通过亚甲基蓝溶液光催化降解试验,对TiO2/AC负载型光催化剂的催化性能进行了测试.结果表明,经400℃煅烧制备而成的TiO2/AC负载型光催化剂的表面TiO2纳米粒子分布均匀、无明显的团聚现象,在紫外光灯的照射下对亚甲基蓝的降解率在2 h内可达68.30%,经6次重复使用后其催化降解率仍能达到60%以上,表明该催化剂具有良好、稳定的催化性能和较高的循环利用价值.  相似文献   

Resolving conflicts between butterfly host resource abundance and genet population size estimates for a vegetatively spreading, threatened grassland legume     

Paul M. Severns  Mark V. Wilson 《Biological conservation》2011,(3):1152-1158

Population size estimates are an integral part of rare plant conservation, but common abundance measurements such as cover and ramet number may not accurately index genet population size for vegetatively spreading species. Population monitoring of Kincaid’s lupine (threatened species) populations occurs through genet-anonymous leaf cover and raceme counts despite extensive, non-adventitious rhizome growth. While the current monitoring scheme provides important resource abundance measurements for the endangered Fender’s blue butterfly, whose larvae feed on Kincaid’s lupine leaves, the methods are not appropriate for estimating lupine genet number. Major axis regression revealed well supported statistical relationships between cover, raceme, and plantlet (a measurement of modular plant growth) density within six study patches (n = 3 populations) of Kincaid’s lupine (R² > 0.90) and when all patch data were combined (R² > 0.91). Genet population size estimates from genotype only data with ACE (an estimator used to infer species richness) were similar to estimates derived from a combination of plantlet density and genet to plantlet ratios (genotype derived) in small, more thoroughly genotyped lupine patches. However, genet number estimates from ACE were 3–5-fold greater in less intensely genotyped patches. Genet-anonymous plant abundance measurements, such as cover, can be used to estimate genet number in populations of vegetatively spreading plants provided they are calibrated with a unit of modular plant growth. Calibration of vegetative measurements, consistency of between population relationships, and closer scrutiny of highly supported statistical models may be necessary to develop more pertinent monitoring methods for rare, vegetatively spreading plants.  相似文献   

蝗虫对蓝光偏振光和非偏振光的定向响应对比   总被引：2，自引：0，他引：2  

刘启航  周强 《农业机械学报》2011,42(12):116-120

为给蝗虫灾害光电诱导捕集治理技术中蝗虫诱导光场性质的确定及不同光场的筛选组合提供理论支持,利用LED光谱色非偏振光、蓝光偏振光和行为反应试验装置,进行了不同光照特性的蓝光偏振光场和光谱色非偏振光场对蝗虫定向选择的对比试验,探讨了不同光场对蝗虫定向选择行为影响的机理.结果表明:蓝光偏振光条件下,蝗虫对光谱色非偏振光的趋光定向响应以紫光最优;蝗虫对偏振光和紫光的趋光定向响应对比中,蝗虫对线偏振光和紫光选择的对比率差别最小;蝗虫对偏振光的趋光定向响应取决于偏振光的光照强度,对非偏振光的趋光定向响应取决于光谱色和光照强度;蝗虫敏感光谱色光照强度和蓝光偏振光光照强度对蝗虫趋光响应敏感临界点的差别程度是影响其趋光定向响应选择差异的原因,但就光场光照性质而言,蝗虫敏感光谱色及其光照强度是提高蝗虫诱导率的关键因素.  相似文献   

Microbial mineralization of atrazine and 2,4-dichlorophenoxyacetic acid in riparian pasture and forest soils     

J. A. Entry  W. H. Emmingham  P. K. Donelly 《Biology and Fertility of Soils》1994,18(2):89-94

Microbial biomass and mineralization of atrazine [2-chloro-4(ethylamino)-6(isopropylamino)s-triazine] and 2,4-D (2,4-dichlorphenoxyacetic acid) were examined in the top 10 cm of riparian pasture soils and in the litter layer and top 10 cm of mineral soils of riparian forest ecosystems. The riparian forest litter had higher levels of active and total fungal biomass than forest or pasture mineral soils in winter, spring, and fall. Active bacterial biomass was higher in forest litter than in forest and pasture mineral soils in spring and autumn, and higher in forest mineral soils than in pasture soils in summer. Total bacterial biomass was higher in forest mineral soils than in pasture soils during all seasons. In spring, it was also higher in forest litter than in pasture soils. Atrazie and 2,4-D mineralization in pasture soils was exceeded by that in forest litter in spring and autumn and by that in forest mineral soils in summer and autumn. There was no correlation between either active or total fungal and bacterial biomass with pesticide degradation.  相似文献   

Growth of rice plants under red light with or without supplemental blue light     

Keiko OHASHI-KANEKO  Ryo MATSUDA  Eiji GOTO  Kazuhiro FUJIWARA  Kenji KURATA 《Soil Science and Plant Nutrition》2006,52(4):444-452

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