百脉根单株产量主要农艺性状的相关和通径分析   总被引：3，自引：0，他引：3  

崔亚飞  曹致中  马乐元 《甘肃农业大学学报》2009,44(4)

通过对百脉根单株的11个农艺性状的相关分析,结果表明:分枝长度(X2)、分枝节间数(X3)、分枝茎粗(X4)、侧枝数(X6)、侧枝长度(X7)、侧枝节间数(X8)、侧枝茎粗(X9)对单株产量(Y)的作用达到极显著水平,分枝数(X1)、自然高度(X11)与单株产量的相关性达到显著水平,而分枝叶柄长度(X5)、侧枝叶柄长度(X10)则与产量的相关性不显著.通径分析结果表明:各性状对产量的直接效应从大到小依次为:分枝长度(1.121 6)>分枝节间数(0.346 3)>侧枝长度(0.114 6)>分枝数(0.106 4)>分枝茎粗(0.084 6)>侧枝节间数(0.034 2)>侧枝茎粗(0.028 9)>侧枝数(0.021 6)>侧枝叶柄长度(-0.043 6)>分枝叶柄长度(-0.065 4)>自然高度(-0.748 2).  相似文献   

A Potential Screening System for Identifying Sorghum Ecotypes with Increased Lysine in the Seeds     

S. Vernaillen    F. Laureys  M. Jacobs 《Plant Breeding》1993,111(4):295-305

Classical “high-lysine” sorghum lines are characterized by smaller seeds than average, due to a decrease in prolamin synthesis and a subsequent decrease in yield. To exploit the natural variation in lysine content and to identify ecotypes with a seed lysine content higher than average, characterized by plump seeds, a method was developed based on root-growth inhibition of seeds growing on a medium containing aminoethylcysteine (AEC), a lysine analogue. By using a collection of sorghum mutants and ecotypes a correlation coefficient of 0.926 between root length and lysine content was established. This method, which uses the root length of plants growing on aec to indicate which lines have a potential elevated lysine content, can be applied for the screening of sorghum germplasm. Since this is a non-destructive method it can also be used at the individual seed level, for example for screening progenies of regenerated plants from in vitro culture to exploit the somaclonal variation.  相似文献   

AN OBSERVATION STUDY ON BIOLOGICAL CHARACTERS AND MATING BEHAVIOR OF DAHURIAN CASEBEARER(COLEOPHORA DAHURICA FLKV.)ADULTS     

Dai Huaguo Song Xiaoling Nanjing Agricultural University Li Jianlong Northeast Forestry University 《林业研究》1993,(2)

Through rearing tests and observations under laboratory conditions,biologicalcharacters and mating behavior of Dahurian casebearer(Coleophora dahurica Flkv.)adultswere studied in this paper.Results discovered that the time of emergense of male adultswas 24h to 36h earlier than that of female adults.The peak of sex pheromone secretion ofthe female adults appeared of 24h to 42h after the emergence.The reaction of male adultson the sex pheromone was most sensitive during 30h to 48h after emerged,so the earlieremergence of the male adults was favorable to mating.The phenomenon of repeatedmating did not exist in female adults,but the male adults could mate for several times,with maximum of 4 times.There was a definite behavioral reaction during the matingperiod of male and female adults,and the certain period of feeding and mating times couldaffect the adults longervity to a certain degree.  相似文献   

Re-defining tillage erosion: quantifying intensity–direction relationships for complex terrain     

T.A. Quine  Y. Zhang 《Soil Use and Management》2004,20(2):124-132

Abstract. Current tillage erosion models account for the influence of tillage direction in the magnitude of the soil (tillage) transport coefficient. It is argued here that this is counter-intuitive and causes significant problems in modelling tillage erosion in areas of complex terrain. This article examines whether a re-modelling of tillage erosion is possible that separates tillage direction (an interaction with the landform) from the soil transport coefficient (a measure of tillage intensity representing the combination of implement erosivity and soil erodibility). Experimental data for mouldboard ploughing upslope, downslope and cross-slope at Coombe Barton Farm, Devon are examined. Integration of data for all directions into a single relationship, which relates translocation in the direction of tillage to slope in the direction of tillage and translocation perpendicular to tillage to slope perpendicular to tillage, is not possible using previously published methods of analysis. However, when total translocation distance is regressed against the tangent of the slope at 45° to the tillage direction (bisecting the tillage direction and the direction of overturning) it is found that a single relationship can be used to describe tillage in all three directions. Therefore, this relationship is used to determine a single value of the soil transport coefficient ( k _fTa) for constant soil and implement conditions but different tillage directions. This redefinition of tillage is important both for true estimation of tillage erosion severity, the adirectional coefficient being 40% larger than the directional coefficient, and for modelling of tillage erosion in complex terrain. These improvements are vital when tillage erosion simulation is used to direct soil conservation strategies.  相似文献   

硝酸还原酶与氮素利用的关系及其在作物遗传育种中的应用(综述)     

孙宝启  李玉京 《中国农业大学学报》1993,(3):29-34

本文综述了硝酸还原酶与氮素利用的关系及其遗传特性和在作物育种中应用的某些最新进展。氮吸收、利用等性状的生理和遗传特性极其复杂,受环境影响很大,对其进行遗传改良需考虑多种指标。对硝酸还原酶活性(NRA)与品质性状和产量的关系的争论很多,有些研究表明 NRA 可作为品质、产量性状的选择指标,有些则相反。逆境条件下 NRA 的变化非常敏感,NRA 可能与抗逆性有关。  相似文献   

蜂胶高生物活性黄酮组分的研究   总被引：5，自引：0，他引：5  

赵静  李熠  薛晓锋  蔡阳 《中国蜂业》2005,56(3):9-10

本文探讨了蜂胶总黄酮中最具活性的黄酮类物质的提取分离、官能结构特征与功能关系、可能的功效,进而提出了如何看待蜂胶总黄酮含量高低的问题.  相似文献   

对小麦F1代正反杂交组合的灰色关联度分析   总被引：1，自引：0，他引：1  

王春平  张伟  苗艳芳  吕静霞 《种子》2005,24(1):30-31,94

运用灰色系统的理论和方法,对2002～2003年18个小麦F1代正反杂交组合的7个主要性状进行综合分析,计算其灰色关联度,分析正反杂交组合的差异,结果表明:200237品系最好,200212品系次之,200246品系最差.同时只有200237和200238、200213和200214品系的正反杂交组合表现为优良组合.  相似文献   

万寿菊的研究进展   总被引：24，自引：0，他引：24  

张继冲  续九如  李福荣  沈一岚 《西南园艺》2005,33(5):17-20

本文概述了万寿菊的主要品种、形态特征、生物学特性、香气组成成分、功能用途、栽培管理方式及育种等内容，并对万寿菊的发展前景作了展望．  相似文献   

Historical range of variability in eastern Cascades forests,Washington, USA     

Agee  James K. 《Landscape Ecology》2003,18(8):725-740

The historical range of variability (HRV) has been suggested as a coarse filter approach to maintain ecosystem sustainability and resiliency. The historical range of variability in forest age structure for the central eastern Cascade Range in Washington State, USA was developed from historical fire return intervals and the manner in which fire acted as both cyclic and stochastic processes. The proportions of seven forest structural stages calculated through these processes were applied to the area of each forest series within the central eastern Cascades landscape. Early successional forest stages were more common in high elevation forest than low elevation forest. The historical proportion of old growth and late successional forest varied from 38 to 63 percent of the forested landscape. These process-based estimates are consistent with those developed from forest structural information. HRV is a valuable planning tool for ecosystem conservation purposes, but must be applied to real landscapes with consideration of both temporal and spatial scale. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

阜康绿洲土壤盐渍化特征及其与肥力的相关性分析   总被引：9，自引：0，他引：9  

顾峰雪  张远东  刘永强  初雨  潘晓玲 《干旱区资源与环境》2003,17(2):78-82

本文以电导、可溶性总盐含量和pH作为指标,将阜康绿洲的盐渍化类型划分为9种,其中以强盐渍土和盐土为主,在纬度梯度上从南至北,即从洪积扇下部到沙漠按照中盐渍土-强盐渍土-盐土-强盐渍土-盐土-非盐渍土的顺序依次分布。而土壤含水率却是从洪积下部至扇缘溢出带逐渐升高,在细土平原地区差异较大,在沙漠中又迅速降低。通过土壤剖面中有机质、全量N、P、K和速效N、P、K的分析,结果表明阜康荒漠自然状态下土壤肥力很低,各养分含量在空间上呈现规律性的变化,在纬度梯度上逐渐升高又在沙漠中降低。通过水盐与土壤肥力的相关性分析,结果表明:有机质、全N、P和速P与含水率、电导、总盐均具有显著和极显著正相关,而与pH成负相关,但相关性不显著。由于盐生植物的多样性,在盐渍土和盐土土壤肥力并无显著降低,只是土壤溶液的高盐浓度限制了植物对养分的吸收,因此防止和治理土壤盐渍化是发挥土地生产潜力的重要手段。  相似文献