Response of western hemlock crosses to nitrogen and phosphorus supply   总被引：1，自引：0，他引：1  

Hawkins  B.J.  Henry  G.  King  J. 《New Forests》2000,20(2):135-143

Seedlings of nine controlled crosses of westernhemlock (Tsuga heterophylla (Raf.) Sarg.) withknown differences in growth rate after six years inthe field were grown for one year, and then subject tothree nutrient treatments. Nutrient treatments variedthe amount of nitrogen (N) and phosphorus (P) innutrient solutions as follows (N:P): 20:4 mgL^–1,100:20 mgL^–1, and 250:60 mgL^–1. Nutrientsolutions were used to subirrigate pots containing theseedlings in a peat:perlite medium for two growingseasons. Biomass and foliar N and P concentrationsincreased while nutrient productivity (biomass/shootN content) decreased with increasing nutrient supply. The nine crosses were divided into fast, medium andslow-growing parental ranks. There was a significantparental rank × nutrient treatment interaction forshoot and total biomass, and root:shoot ratio. Theresults indicate that tree improvement programs forwestern hemlock should plant progeny trials on sitesof different fertilities to examine relative responseof crosses.  相似文献   

空间诱变因素对不同粳稻基因型的生物学效应研究   总被引：38，自引：11，他引：27  

徐建龙 《核农学报》2000,14(1):56-60

研究结果表明,空间搭载种子的发芽率、存苗率和结实率均低于对照,对秧苗的生长表现出刺激和抑制两种作用,生理损伤比地面γ射线处理的轻得多,个别品种M1 代出现了谷粒颜色的突变。M2 代在株高和抽穗期等性状上出现了较大的分离,突变频率和诱变效率因不同基因型材料差异较大,而且一些性状的突变具有一定的方向性。经同一材料的空间和γ射线辐照处理比较,其突变频率和诱变效率因不同的突变性状存在着一定的差异。在空间处理的M2 代就出现较多综合性状优良的突变体,可望直接育成新品种。  相似文献   

Influences of Cadmium on Grain Mineral Nutrient Contents of Two Rice Genotypes Differing in Grain Cadmium Accumulation   总被引：1，自引：0，他引：1  

CHENG Wang-da  YAO Hai-gen  ZHANG Hong-mei  TAO Xian-guo 《水稻科学》2009,16(2):151-156

A pot experiment was conducted to study the effects of Cd on grain Cd, K, P, Mg, Zn, Cu, Pb, Fe and Mn accumulation in two rice genotypes (Xiushui 63 and Xiushui 217) differing in grain Cd accumulation under four Cd levels, i.e. 0, 0.5, 2.5 and 12.5 mg/kg. Rice genotype greatly affected the grain K content, but not significantly for P, Mg, Zn, Cu, Pb, Fe and Mn contents. There were remarkable effects of additional Cd on the contents of P, Mg and Zn in grains, while not significant for K, Cu, Pb, Fe and Mn contents. No significant differences were found in the interaction of genotype by additional Cd on these nine element contents. The low grain Cd accumulation genotype Xiushui 217 had significantly higher grain K, Mg, Cu and Mn contents than the high grain Cd accumulation genotype Xiushui 63, but the case was opposite for Zn, Pb and Fe contents. It also showed that Cd addition levels significantly influenced the K, P, Mg, Zn, Cu, Pb, Fe and Mn contents in rice grains. Grain K, P, Mg, Zn, Fe and Mn contents reduced with the increasing rate of Cd addition.  相似文献   

中国奶牛PrP基因型分析     

张太翔  田国华  田国宁  张金玲  韩亮  张丽萍 《中国畜牧兽医》2009,36(3):110-111

根据已报道奶牛朊蛋白(PrP)基因序列设计引物,采用PCR法扩增了28头黑白花奶牛的PrP基因。序列测定及分析结果表明,所克隆的奶牛PrP基因片段为677 bp,编码225个氨基酸的前体蛋白。对其136、154、171位点氨基酸多态性分析结果发现,对TSE中度易感的ARQ型占检测奶牛的82.9%,对TSE抗性的ARR型占7.1%,对TSE高度易感的VRQ型占10%。这说明中国奶牛的基因型对TSE中度易感,为防制TSE的发生提供基础数据。  相似文献   

基于GGE双标图的长江中下游中籼迟熟区试品种丰产适应性及抗稻瘟病性评价     

杨璐  杨峰  刘奇颀 《中国农业大学学报》2024,(3):27-35

为评价长江中下游地区籼稻稻瘟病抗性以及丰产适应性和稳定性,采用GGE双标图对13个中籼迟熟水稻品种在长江中下游16个试验点的产量数据及稻瘟病抗性数据进行综合分析。结果表明：‘爽两优粤农丝苗’平均产量为0.95 kg/hm²,产量稳定性好,稻瘟病抗性鉴定指数3.2,是长江中下游地区高产、稳产、且对稻瘟病高抗的中籼迟熟品种;‘春9两优70’平均产量高,可达0.97 kg/hm²,稳定性中等,稻瘟病抗性高,其鉴定综合指数为3.3,该品种在湖南岳阳、湖北黄冈和安徽芜湖的产量表现均较好,产量分别达1.09、1.16和1.06 kg/hm²,具有广泛的适应性。‘深和两优1133’产量也较高,可达0.93 kg/hm²,但稳定性差,稻瘟病抗性鉴定综合指数平均为4.0,对环境敏感性强,适合在特定的地点如江西高安、福建建阳、浙江温州等地种植。通过GGE双标图对试验地点进行综合评价,湖北武汉、湖北黄冈、安徽休宁、江西吉安和浙江温州对参试品种的区分力较强、生态区的代表性好,是较理想的试验地点。  相似文献   

谷子地方品种发芽期和苗期对NaCl胁迫的反应和耐盐品种筛选   总被引：19，自引：0，他引：19  

田伯红  王素英  李雅静  王建广  张立新  梁凤芹  翟玉柱  刘金荣 《作物学报》2008,34(12):2218-2222

用150 mmol L^-1和200 mmol L^-1NaCl溶液鉴定194份来自河南、山东、河北等地的谷子地方品种的耐盐性,筛选出红谷、小黄谷、三变丑等11份耐盐性较强的品种,野谷5号和洋谷对盐胁迫比较敏感;不同品种发芽率、根和芽生长表现不同。发芽相对盐害率与苗期株高和第一片真叶面积相对盐害率没有显著相关性,但发芽期耐盐性差的品种野谷5号和洋谷在苗期耐盐性也较差。芽期耐盐性强的红谷、小黄谷和三变丑在150~200 mmol L^-1下苗期株高相对盐害率小于野谷5号和洋谷,三变丑的株高相对盐害率低于红谷和小黄谷,在高浓度下小黄谷的叶面积相对盐害率最小。  相似文献   

空间统计分析在作物育种品系选择中的效果   总被引：2，自引：0，他引：2  

胡希远  李建平  宋喜芳 《作物学报》2008,34(3):412-417

为了研究空间统计分析法在作物育种田间试验品系选择中的效果,采用剩余误差空间相关线性混合模型对一个具有56个品系的小麦育种随机区组设计田间试验产量资料进行了空间统计分析。运用地理统计学中的半变异函数法确定剩余误差空间协方差的函数。结果表明,试验的剩余误差存在着典型的空间相关性,利用剩余误差空间协方差结构的信息可降低品系效应估计的误差和提高品系效应差异F检验与t检验的效率。此外,空间分析法对品系效应估计受试验条件不均匀的影响小,可导致较经典方差分析法不同的品系排序和优系选择结果。  相似文献   

Molecular characterization of storage proteins for selected durum wheat varieties grown in different environments     

《Journal of Cereal Science》2015

The variations of the amounts of individual high molecular weight glutenin subunits (HMW-GS), of the ratios HMW-GSy to HMW-GSx and HMW-GS to low molecular weight glutenin subunits (LMW-GS) and of protein content were evaluated for eight durum wheat cultivars in two regions using four fertilizer combinations during two successive years. All measured parameters showed significant variation with genotypes (G), environments (E) and fertilizers (F). The interaction E × G × F was highly significant for glutenin amount variation. Amongst cultivars possessing HMW-GS 20, landraces seem to better value the N-fertilizer use for the accumulation of HMW-GSy than high yielding cultivars. Both HMW-GSy to HMW-GSx and HMW-GS to LMW-GS ratios were found to be positively correlated (p < 0.05) with total protein content.  相似文献   

Identification of a novel cyprinid herpesvirus 3 genotype detected in koi from the East Asian and South‐East Asian Regions          下载免费PDF全文

J Chen  D Chee  Y Wang  G Y Lim  S M Chong  Y N Lin  T Huangfu 《Journal of fish diseases》2015,38(10):915-923

Cyprinid herpesvirus 3 (CyHV‐3) is a highly contagious virus that causes significant morbidity and mortality in common carp Cyprinus carpio L. and considered to be one of the most important pathogens of koi and common carp worldwide. Cyprinid herpesvirus 3 infected consignments imported from East Asian and South‐East Asian regions were identified during quarantine period in Singapore, and virus from a 2005 consignment was successfully isolated in koi fin cells. A combination of sequence analyses and duplex PCR were used to characterize 15 CyHV‐3 isolates detected in koi consignments between 2005 and 2011. Sequence analyses of the enlarged 9/5, SphI‐5 and TK gene regions identified both the Asian 1 (n = 11) and European 4 (n = 4) genotypes. Duplex PCR analysis of two variable marker regions between ORF29 and ORF30 (marker I) as well as ORF133 and its upstream region (marker II) revealed viruses of genotypes J (I⁺⁺II⁺), U/I (I⁻⁻II⁻), an intermediate genotype (I⁺⁺II⁻) and a novel genotype, I⁺⁺II^+Δ, which was identified in viruses from seven different consignments. This novel genotype has a 13‐bp deletion in marker II, while maintaining the I⁺⁺ allele of marker I. The I⁺⁺II^+Δ genotype may have emerged from East Asian and South‐East Asian regions in recent years.  相似文献   

Photosynthate transport rather than photosynthesis rate is critical for low potassium adaptation of two cotton genotypes     

Yanshu Hao  Jing Lei  Xiuwen Wu  Lishu Wu 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2016,66(2):170-177

Potassium (K) is an essential macronutrient for plant growth and development. Plant growth and development can be seriously affected by K deficiency. However, plants with different K efficiencies behave differently. It is still not fully understood how plants with higher K efficiency could maintain better growth in a low K environment and what is the relationship between K recycling and photosynthesis metabolism. The aim of this study was to investigate whether the difference in K re-translocation and photosynthesis transportation can explain genotype differences in K efficiency between K-efficient genotype 103 and K-inefficient genotype 122. Results of this study showed that the dry matter accumulation of genotype 122 decreased much more than that of genotype 103 affected by K deficiency environment. Root growth of the two genotypes was inhibited by K deficiency, but genotype 122 was affected more than genotype 103. Using the K utilization index as an evaluation factor for K efficiency, it was found that genotype 103 was significantly higher than genotype 122. Potassium affected the K distribution in plants for both the genotypes. Potassium was distributed more to the stem and leafstalk in a normal K environment whereas it was more to the leaf and root in a low K environment, especially for genotype 103. Potassium also affected photosynthetic products’ distribution. The leaf of genotype 122 accumulated most of its photosynthetic product while genotype 103 had better ability to transport it into the root to maintain better growth under a K-deficient environment. Results of this study indicated that more K recycling into the root and more efficient transport of the photosynthetic product into the root contribute to better root growth and therefore increased tolerance to K deficiency.  相似文献