Salinity stress responses of a sterile mutant of Ulva pertusa (Ulvales, Chlorophyta)     

Makoto  KAKINUMA  Yoshinao  KUNO  Hideomi  AMANO 《Fisheries Science》2004,70(6):1177-1179

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Correlated Responses in Two Traits when Selection is Practised on their Ratio     

M. Hühn 《Plant Breeding》1992,109(1):28-34

In many fields of application in plant breeding and crop science, ratios of two component traits X and Y are of interest (harvest index in cereals, leaf-to-stem ratio in forage legumes, height-to-diameter ratio in forest trees etc.). When selection is practised on the ratio X/Y of two traits X and Y, the experimenter may be interested in the resulting changes of both trait means. Based on improved approximations for the covariances between X and X/Y and between Y and X/Y and for the variance of X/Y the changes in the means of X and Y can be predicted by applying the regression approach from conventional selection theory. Explicit expressions for these correlated responses in X and Y when selection is practised on their ratio X/Y are derived and discussed. The different outcomes (decrease, zero change or increase) for the selection pressures on X and Y are characterized by phenotypic coefficients of variation of X and Y, phenotypic and genotypic correlations between X and Y and heritabilities of X and Y.  相似文献   

关中驴对6株动物病毒抗原的免疫应答试验     

李六金  朱德生  贾满民  陈慧茹  吴耀南  赵永康  押宗保 《动物医学进展》2003,24(3):104-108

以关中驴为试验动物 ,用猪瘟病毒(HCV )、犬细小病毒 (CPV )、兔瘟病毒(RHDV)、鸡新城疫病毒 (NDV)、伪狂犬病毒(PRV)等病毒进行免疫 ,检测所产生的抗体效价 ,并与猪、鸡、兔、犬、及猫等动物进行比较。试验结果表明 ,关中驴与对照动物产生的抗体效价一致 ,证明了关中驴可替代其它动物用于生物制品研究  相似文献   

退化草地土壤生化活性研究   总被引：3，自引：0，他引：3  

龙章富  刘世贵 《草地学报》1994,2(2):58-65

通过对三种不同退化程度的退化草地土壤生化活性进行测定和相关性分析，结果表明草地退化后其土壤生化活性受到不同程度的影响，表现为土壤生化活性随着退化程度增高而减小，但差异并非都达到统计学上的显著性，而土壤生化活性间的相关性则显著地与草地退化程度有关，说明退化草地土壤微生物间的协调作用受到显著影响，从而影响土壤氮素和碳素代谢途径。  相似文献   

橡胶树低温伤害的生理反应   总被引：4，自引：1，他引：3  

林梅馨  杨汉金 《热带作物学报》1994,15(2):7-11

在人工零上低温下,巴西橡胶树(Hevea brasiliensis)叶质膜透性随低温处理时间的延长而持续上升,抗冷品系的上升速率比不抗冷品系慢。呼吸强度和ATP含量均随处理时间的延长而持续下降,抗冷品系下降速率比不抗冷品系慢。叶绿体Mg~(++)—ATPase活性也表现出明显抗性差异。可见,低温下叶组织的质膜透性、呼吸强度、ATP含量以及Mg~(++)—ATPase活性的变化与品系抗冷性有关。低温下呼吸强度、ATP含量与质膜透性变化呈负相关,质膜透性的变化与供能有关。  相似文献   

巨桉纸浆原料林土壤养分与林木生长研究   总被引：5，自引：0，他引：5  

吴勇刚  张健  何惠琴 《四川林业科技》2004,25(2):42-45

通过相关分析及回归分析，探讨了巨桉人工林土壤养分与林木生长的关系，结果表明：土壤速效N、速效P、土壤有机质的浓度与林木胸径、树高、材积极显著正相关，土壤全N、全P与林木胸径树高、材积显著正相关。建立了胸径、树高、材积与土壤养分的线形回归方程，最佳数学表达式说明速效N、速效P是影响巨桉林生长的关键土壤养分。  相似文献   

Morphological characterization of the interaction between Diplocarpon rosae and various rose species     

O. Blechert  T. Debener † 《Plant pathology》2005,54(1):82-90

Blackspot, caused by Diplocarpon rosae , is the most severe and ubiquitous disease of garden roses, but information is lacking about genotype-specific forms of resistance and susceptibility of the host. Macro- and microscopic analyses of 34 rose genotypes with a defined monoconidial culture black spot inoculum identified susceptible and resistant rose genotypes and further genotype-specific subdivisions, indicating the presence of partial forms of resistance and different resistance mechanisms. In total, eight interaction types were characterized, five representing compatible (types 1–5) and three representing incompatible interactions (types 6–8). The incompatible interactions were characterized by the lack of any visible fungal structures beneath the cuticle (type 8), single-cell necroses (type 7) or necroses of larger cell clusters (type 6), the latter two types with penetration hyphae and haustoria in epidermal cells.  相似文献   

洋葱型大蒜及其成因分析     

刘世琦  张圣平  谷为刚 《中国蔬菜》2005,1(12):20-22

洋葱型大蒜为大蒜鳞茎异常生理变态所形成的类似洋葱鳞茎结构的大蒜(原称“面包蒜”),该鳞茎主要由肥厚的叶鞘基部及鳞芽的外层鳞片加厚所构成,无肉质鳞片或肉质鳞片极不发达,可形成蒜薹或无薹分化,无任何食用价值。洋葱型大蒜的形成与N、P、K超量施用且配比不当,追N过多且时间过早,土壤过于粘重并长期处于水分饱和状态等有密切关系。  相似文献   

加热光纤法同步测定土壤水热参数误差分析     

胡优  司炳成  李敏  何海龙  何冬  任姮烨  刘吕刚 《土壤学报》2024,61(4)

土壤水热参数是研究土壤水热传输的基本物理参数。当前热脉冲探针法（HPP）可同步测定土壤水热参数,但该方法仅限于在点尺度下测定。与其具有相同理论基础的加热光纤法（SPHP-DTS）,可将测定尺度增大至田间千米尺度,但其测定精度尚未得到有效验证。为了探知SPHP-DTS法的误差,本研究进行了SPHP-DTS法与HPP法测定土壤水热参数的对比试验。结果表明,以HPP为标准,加热光纤法测定热导率的精度RMSE为0.13 W?m-1?℃-1。SPHP-DTS法测定的热导率显著高于HPP法,主要原因在于加热光纤时产生的温度效应。通过热导率法测定土壤含水率时,在热导率测定误差的影响下,SPHP-DTS法的测定精度明显低于HPP法。SPHP-DTS法测定土壤水热参数的其他误差来源包括光纤与土壤之间多个界面的接触热阻、光纤的温度敏感性、噪音干扰以及温度梯度驱动下的水分迁移。本研究可为SPHP-DTS法提升土壤水热参数测定精度提供理论参考。  相似文献   

Immunosurveillance and tumorigenesis in BALB/c mice--1. Early reactive state in Peyer's patches.     

V A Toma  F P Retief 《Comparative immunology, microbiology and infectious diseases》1979,2(1):43-53

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