江西银杏叶黄酮类化合物含量及变化规律研究(Ⅰ)

用分光光度法测定了从江西各地引种到江西农业大学的银杏其叶不同季节的黄酮类化合物含量,结果表明：不同种源的银杏叶黄酮含量差异较大;不同季节含量也有差异,以１０月份为最高。     

基于GAM 的吉尔伯特群岛海域黄鳍金枪鱼栖息地综合指数

为了可持续利用黄鳍金枪鱼(Thunnus albacares)资源,本文利用2009年10月～12月吉尔伯特群岛海域海上实测的34个站点海洋环境垂直剖面数据,黄鳍金枪鱼渔获率数据,应用广义加性模型(generalized additive model,GAM) 进行建模,预测渔获率,并通过wilcoxon检验来判断预测渔获率与名义渔获率是否存在显著相关性。根据预测渔获率估算黄鳍金枪鱼的栖息地综合指数(IHI),通过对各水层IHI均值分析和Pearson相关系数,判断该方法的预测能力。使用2010年11月～2011年1月在吉尔伯特群岛海域实测的16个站点40～80m水层和0～240m水体的环境数据,验证模型。结果表明：(1)拟合的各水层的IHI值分布各不相同,各水层中影响黄鳍金枪鱼分布的因子各不相同,黄鳍金枪鱼主要栖息在40～120m水层;(2)2010年数据验证结果表明,GAM模型的预测能力较好;(3)GAM在筛选影响黄鳍金枪鱼分布的因子时比较有效,能反应黄鳍金枪鱼渔获率与环境因子之间的非线性关系;(4)可通过GAM建立IHI指数模型来分析大洋性鱼类栖息地的空间分布。     

高产优质机采棉新陆早73号选育及栽培技术

简要介绍了新陆早73号的选育过程,品种的特征特性、产量表现、品质性状、抗病性以及栽培管理技术要点。     

茶秆竹竹鞭生长规律的研究

茶秆竹竹鞭绝大部分分布在0－30cm土层中。竹鞭生物量与鞭长、鞭径呈正相关。壮芽比例是1龄竹鞭的较少，随着鞭龄加大而增多，然后又迅速减少。笋芽多长在2－3龄竹鞭上。竹鞭划分应以1龄为幼龄鞭，2－3为壮龄鞭，4龄为中龄鞭，4龄以上为老龄鞭。     

循环水养殖密度和氨氮对斜带石斑鱼生长和免疫力的影响

选取平均体重为146.3 g/尾的斜带石斑鱼450尾分成3个密度组进行饲养,分别为低密度组D1(100尾/m³,14.6 kg/m³)、中密度组D2(150尾/m³,21.7 kg/m³)和高密度组D3(200 尾/m³,29.5 kg/m³),比较不同养殖密度引起的水质变化对斜带石斑鱼的生长性能、摄食率和免疫力的影响。结果表明：水体中氨氮含量随斜带石斑鱼养殖密度的增加而增加(P<0.05);斜带石斑鱼的摄食率随水体中氨氮浓度的增加而显著下降(P<0.05)。随着养殖密度的增加,斜带石斑鱼的生长速度呈现负相关性,各试验组的特定生长率分别为1.07、0.66、0.47;各实验组斜带石斑鱼体重也出现显著性差异(P<0.05),各实验组的尾均增重量分别为118.5 g、63.3 g和44.1 g;养殖密度对斜带石斑鱼的饵料系数和成活率无显著影响(P>0.05);斜带石斑鱼的免疫指标血清溶菌酶(LZM)、碱性磷酸酶(AKP)和超氧化物歧化酶(SOD)随养殖密度的增加而下降,随养殖时间的延长呈现出先上升后下降的趋势。阐明了养殖密度引起养殖水质状况的改变,继而影响斜带石斑鱼摄食率的变化,从而造成石斑鱼的生长性能出现显著性差异,可能是养殖密度对斜带石斑鱼生长性能影响的机制之一。     

天目铁木的花及花粉形态

1 前言 天目铁木Ostrya rederiana Chun是陈焕镛先生根据浙江西天目山标本于1927年命名,发表于阿诺德树木园杂志(Journ.Arb.Arn.8:19,1927.)上。该种是浙江天目山的特有种,现存母树仅6株,幼树很少,最粗一株树高12.5m,胸径80cm(顶部被雷击断),最高的一株树高20m,胸径45~-cm,已采取紧急措施,加以保护。     

Consequences of pre-planting treatments of potato seed tubers on leaf area index formation

Abstract

In field trials conducted in 2000–2002, we examined the influence of pre-planting treatments of seed tubers on the formation of leaf area index. The potato varieties used were Agrie Dzeltenie (early), Piret (middle-maturing) and Ants (late). The following treatments were used: untreated control, thermal shock and pre-sprouting. Pre-sprouting treatments of all varieties and thermal shock treatment of the variety Agrie Dzeltenie had a significant effect on the leaf area index. The value and timing of maximum leaf area index were: variety specific, 4.0 units of the early variety Agrie Dzeltenie, 3.7 units of the middle-maturing variety Piret and 3.9 units of the late variety Ants. The weight of the haulms of the plants developed from physiologically older seed tubers formed faster and remained smaller. Pre-planting treatment of seed tubers provided quicker field emergence. The slower the potato plants developed the haulms, the greater the maximum weight achieved. Pre-planting treatments influence the leaf area index. The importance of this influence lies in potato varieties with different maturity times since increases in quality and yield depend on the size of the photosynthetic area.     

Powdery mildew resistance of Nordic spring wheat cultivars grown in Estonia

Abstract

A group of spring wheat cultivars originating from Sweden, Finland, Norway, Germany, and the Netherlands was analysed for powdery mildew resistance. Using functional molecular markers, two alleles of the major resistance gene Pm3 were detected among the cultivars under the study. One of the alleles, Pm3d, was detected in the resistant cultivars ‘Vinjett’, ‘SW Estrad’, and ‘Zebra’, and in ‘Tjalve’, a cultivar of earlier release susceptible to the local population of powdery mildew. The second allele of Pm3 detected in the analysed group of cultivars was the allele Pm3f, rarely used in Europe. It was identified in the resistant cultivars ‘Satu’, ‘Helle’, and in the moderatively resistant cultivar ‘Mahti’. Pm3f was found to be effective against the local population of powdery mildew in Estonia, while Pm3d provided no protective effect. Besides the Pm3d allele on chromosome 1A, monosomic analysis of the cultivar ‘Vinjett’,which is almost immune to powdery mildew, identified two additional loci on chromosomes 5D and 7D, respectively, presumably responsible for the high resistance in this cultivar. In contrast to the earlier cultivars, six recently released cultivars (‘Vinjett’, ‘SW Estrad’, ‘Zebra’, ‘Satu’, ‘Helle’, ‘Meri’) demonstrated a high resistance to the powdery mildew fungus Blumeria graminis DC. f. sp. tritici both in the field and seedling tests, showing that the genetic basis of powdery mildew resistance in Nordic spring wheat has been improved noticeably in the last ten years.     

茶业电子商务的现状与对策

本文从茶商的角度,分析电子商务时代的到来给茶商带来什么样的机会,介绍当前茶业电子商务的现状,剖析茶业电子商务应用过程中存在的问题,提出茶商应如何开展电子商务,最后展望茶业电子商务的前景。     

几个玉米骨干自交系杂交优势利用研究

利用15份玉米自交系组配试验，对其主要数量性状的GCA、SCA、TCA以及各自交系的SCA方差进行估算和分析。结果表明，各自交系的GCA、SCA方差均达极显著水平。P6C1－2－1、Y65－941－1、6166、中黄6441等4个自交系综合性状较优，是组配强优势杂交组合的优良自交系。