亚热带水产养殖寒灾预警系统的设计与实现     

涂超 《安徽农业科学》2011,(17):10694-10696

通过对亚热带水产养殖现状的分析，论述了亚热带水产养殖寒灾预警系统建设的必要性、研究的目标和任务，详细介绍了系统的结构和框架，以及亚热带水产养殖寒灾预警的几个关键问题及其解决方法。  相似文献   

Associations of Gonadotropin-Releasing Hormone Receptor (GnRHR) and Neuropeptide Y (NPY) Genes'''' Polymorphisms with Egg-Laying Traits in Wenchang Chicken     

WU Xu  LI Hui-fang  YAN Mei-jiao  TANG Qing-ping  CHEN Kuan-wei  WANG Jin-yu  GAO Yu-shi  TU Yun-jie  YU Ya-bo  ZHU Wen-qi 《中国农业科学(英文版)》2007,6(4):499-505

Single nucleotide polymorphisms (SNP) of chicken gonadotropin-releasing hormone receptor (GnRHR) and neuropeptide Y (NPY) were selected to identify the genotypes of Wenchang (Chinese indigenous breed) chicken with restricton fragment length polymorphisms. The associations of the SNPs with the total egg production (NE), average days of continual laying (ADCL), and number of double-yolked eggs (DYE) traits were analyzed. The frequency of restriction enzyme A/a alleles in the population was for GnRHR 0.69 (Bpu1102 Ⅰ A) and 0.31 (Bpu1102 Ⅰ a) and for NPY 0.46 (Dra Ⅰ B) and 0.54 (Dra Ⅰ b). Trait data from a total of 120 hens, which were purebred introduced from Hainan Province, China from one generation were recorded. Two significant effects of genes' marker were found for GnRHR and number of eggs (dominant; t= 2.67, df= 116) and NPY and number of eggs (additive; t= 1.97, df= 116). The current research supports the effects of GnRHR and NPY genes on egg-laying traits of chickens.  相似文献   

四川省主要杂交稻品种抗瘟性评价     

程开禄  黄富  彭国亮  罗庆明  潘学贤  刘兴义  涂建华  罗林明  刘牛  卿雨文  张志东 《西南农业学报》2000,13(1):125-127

"八五"以来,四川省培育出了一批新的杂交稻抗病丰产品种,及时更换了已丧失抗病性的主栽品种汕优63,使四川省结束了品种单一化种植的局面,控制了稻瘟病的大发生、大流行,确保了我省水稻持续高产稳产.1997年,我们对四川省主栽水稻品种和新育成品种的抗瘟性进行了系统评价,以期为这些品种的推广利用和合理布局提供科学依据.  相似文献   

紫穗槐在公路边坡绿化中的栽培技术   总被引：1，自引：0，他引：1  

冉秀琼  屠剑斌 《陕西林业科技》2008,(2)

紫穗槐生长快、繁殖力强,适应性广,耐盐碱、耐水湿和耐瘠薄,根系发达,是优良的生物护坡地被植物。本文讲述了紫穗槐公路绿化中的应用方法,介绍了该树种育苗、管理等方面的技术要点。  相似文献   

水稻种子活力综合评价模型的建立     

张越  张艺璇  奎丽梅  刘鹏飞  胡茂林  涂建  杨丽萍  李小林  谷安宇 《广东农业科学》2023,50(12):172-183

【目的】建立水稻种子活力的数学评价模型 D(x)，旨在为水稻种子活力性状评价、鉴定和遗传改良提供参考。【方法】以 25 份水稻种子为试验材料，通过标准发芽试验、四唑染色鉴定、模拟田间试验和 Q2技术测定水稻种子的多项指标，利用主成分分析结合隶属函数法和多元线性回归对这些指标进行分析，建立种子活力的数学评价模型 D(x)。利用该模型评价不同栽培密度对水稻种子活力的影响。【结果】籼稻的发芽势、发芽率、7 d 芽长、百株鲜质量、田间芽长、田间根长、初始代谢速率（SMR）、萌发启动时间（IMT）、理论萌发时间（RGT）及四唑染色率等指标的平均值均高于粳稻，而 7 d 根长、百株干质量、萌发氧气消耗速率（OMR）的平均值略低于粳稻。在 Q2 检测中，粳稻的 IMT 值、RGT 值等指标则较优。对 13 个水稻种子活力指标进行相关性分析发现，各指标间存在不同程度的相关性，Q2 检测中的 SMR 值与 IMT 值、OMR 值、RGT 值及百株干质量极显著相关，与田间芽长显著相关；OMR 值与 SMR 值、IMT 值、RGT 值极显著相关，与发芽势显著相关。通过逐步回归建立了种子活力综合评价预测模型Y(x)=0.693+0.003X1-0.006X2-0.127X6-0.004X8+0.234X9（R2=0.94），用这 5 个指标得到的活力预测值（Y）与田间出苗率在参试材料之间的次序基本一致，且两者高度相关（r=0.83），说明用该回归方程可有效预测水稻种子活力。【结论】可选择发芽势、发芽率、百株干质量、OMR 值和 IMT 值这 5 个单项指标作为评价种子活力的依据。  相似文献   

嘉兴市区道路绿化浅探     

屠娟丽  王逢垚 《浙江林业科技》2004,24(6):65-68

通过对嘉兴市区道路绿化的调查,发现存在树种单一、层次单调等问题,对此提出相应的改进措施,以创造完整、连续的道路绿化空间.  相似文献   

桂牧1号草地内冬种一年生黑麦草的效果(一)     

闫景彩  黄璜  屠敏仪 《草业科学》2002,19(3):24-26

于深秋至晚春，在桂牧1号草地的行间种植一年生黑麦草，观察测定这种种植方式给2种草及草地带来的影响。试验设计3个处理：①在桂牧1号草地内冬种一年生黑麦草，②单种桂牧1号，③单种一年生黑麦草。把处理②的产草量与处理③的首次产量相加作为处理④，以代表桂牧1号与一年生黑麦草轮作时的产量。结果是：处理①与②中桂牧1号的越冬率无显著差异；处理①的单位面积产草量极显著高于②、④；春季，处理①的杂草极显著地少于②。这表明，在桂牧1号草地内冬种一年生黑麦草是可行可取的。  相似文献   

福建山地杉木大径材定向培育技术   总被引：5，自引：0，他引：5  

叶功富  涂育合  廖祖辉 《林业科技开发》2006,20(3):72-75

在闽北、闽中山地，通过对杉木大径材培育过程中的遗传控制、密度控制、立地控制与林分施肥等主要措施的试验研究．确定了杉木大径材定向培育的优化方案，即选用杉木优良家系，选择18指数以上的立地，初植密度1800～2505株／hm^2，间伐后保留密度1100～1200株／hm^2，可不施肥。为杉木大径材的目标经营提供科学依据。  相似文献   

Development of cell model of polymer/liquid crystal and effect of their elasticity on adhesion of rBM-MSCs     

GUO Yan-shan  WU Hao  ZHENG Li-heng  SHANG Yu-pan  TU Mei  ZHANG Jia-qing 《园艺学报》2015,31(6):1064-1069

AIM: To develop the cell model of polymer/liquid crystal and to study the effect of their elasticity on the adhesion of rat bone marrow mesenchymal stem cells (rBM-MSCs). METHODS: Using the method of solvent evaporation induced phase separation, the cell model of polymer/liquid crystal was constructed. The surface morphology and phase separation structure were determined by polarized optical microscopy (POM), scanning electron microscopy (SEM) and small angle X-ray scattering (SAXS). rBM-MSCs were separated and expanded by adherent culture. The surface markers of rBM-MSCs were detected by flow cytometry. The cells were induced to osteogenic differentiation and adipogenic differentiation for 2 weeks. After 3 passages, the cells were divided into 4 groups, including total PU control group, 10% membrane group, 30% membrane group and 50% membrane group. The cells were then incubated with rhodamine phalloidin for cytoskeleton staining and were observed under the confocal laser scanning microscope after cultured for 24 h. RESULTS: The cell model of polymer/liquid crystal was constructed successfully using the method of solvent evaporation induced phase separation. Flow cytometry results showed that the rBM-MSCs positively expressed CD29, CD44 and CD90, and negatively expressed CD34 and CD45. After stained with alizarin red S and oil red O, the calcium nodule and lipid droplets in rBM-MSCs were observed obviously. The cytoskeleton staining result indicated that the area in total PU control group, 10% membrane group and 30% membrane group were greater, and the actin microfilaments were also clearer than that in 50% membrane group. CONCLUSION: The cell model with suitable content of liquid crystal made a contribution to the rBM-MSCs' adhesion, but too much liquid crystal inhibits cell adhesion.  相似文献   

大豆与烤烟不同套作年限对根际土壤微生物数量的影响   总被引：5，自引：0，他引：5  

涂勇  杨文钰  刘卫国  雍太文  江连强  王小春 《作物学报》2015,41(5):733-742

为克服烟田连作障碍、提高烤烟产量和质量,以大豆套作烤烟为种植模式,调查大豆与烤烟不同套作年限下根际土壤三大类群微生物和与氮代谢相关的功能性微生物群落的数量变化及其与烤烟主要土传病害的发生情况之间的相互关系。结果表明,烤烟-大豆带状套作显著增加作物根际土壤的细菌(B)、放线菌(A)数量、B/F和A/F值,减少真菌(F)数量;也提高与土壤氮素代谢相关的氨化细菌、硝酸细菌、亚硝酸细菌、自生固氮菌等功能性微生物数量;烟豆套作能降低烤烟主要土传病害的发生,其发生程度与烤烟根际土壤细菌及放线菌数量显著负相关,而与真菌数量极显著正相关。随着套作年限的延长,根际土壤的细菌(B)、放线菌(A)、B/F和A/F值以及氨化细菌、硝酸细菌、亚硝酸细菌、自生固氮菌等有益菌群数量大幅度增加,真菌(F)及反硝化细菌的数量显著减少,对烟草土传病害的相对防治效果明显提高,以上效应表现为烤烟-大豆带状套作3年(A3)烤烟-大豆带状套作2年(A2)烤烟-大豆带状套作1年(A1)。  相似文献