On farm observations to increase genetic gain in breeding schemes for village poultry production – A simulation study     

Thinh Tuan Chu  John W.M. Bastiaansen  Elise Norberg  Peer Berg 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2018,68(1):1-10

To improve genetic gain of breeding programs for village poultry production, breeding schemes with observations obtained in village production systems using individual (VIO) and group recording (VGO) were examined under different levels of genotype-by-environment-interactions (GxE). GxE was modeled by varying the correlation between traits measured in the breeding station and village environments for bodyweight (r_{g_BW}) and egg production (r_{g_EP}). Relative and absolute genetic gains obtained from VIO and VGO were used for comparison between the schemes. Results showed that village observations significantly improved genetic gains compared to the scheme without birds tested in the village. The improvement was only slightly larger with individual observations than with group observations. Higher r_{g_BW} and r_{g_EP} led to lower relative genetic gain, but a higher absolute gain of VIO and VGO. It is recommended to apply a breeding scheme using group recording of village performance when strong GxE in breeding for village poultry is expected.  相似文献   

合浦县优质高产豇豆品种比较试验     

王英日  李团  贝近灵 《长江蔬菜》2016,(2):48-50

为筛选出适合广西合浦县种植的高产、优质、抗病的豇豆新品种,2015年特选6个豇豆品种与春宝1号进行比较试验。试验结果表明,恒丰8号、华珍8号和源丰6号为中熟品种,单荚性状较优,总产量和早期产量均较高,生长势和抗病毒性表现均较好,是适宜本地栽培的优良豇豆新品种,值得大面积推广;高优好777开花早,始花、结荚节位低,分枝起节位少,早熟性好,单荚性状中等,早期长势较好,抗寒性较强,但抗病毒性较差,适宜本地早春早熟栽培,可以适当推广。  相似文献   

紫色马铃薯“黑美人”辐射处理表型及DNA变异鉴定     

黄团  李旭  黄先群  辛智海  曹通  李丽  刘竹梓  丁小令  林平  陈梦玉 《西北农业学报》2014,23(3):145-150

利用60 Coγ射线对紫色马铃薯品种黑美人萌芽薯块进行诱变处理。诱变材料表型鉴定结果表明,辐照剂量与出苗率呈显著负相关,其半致死剂量为70Gy,致死剂量为80Gy。辐照处理能显著延缓出苗时间,导致叶片减少、茎杆变细、植株变矮。高剂量处理可提高分枝数。与CK相比,各处理结薯数差异不显著。单株产量随辐照剂量增加而降低,CK处理显著高于其他处理。在表型鉴定的基础上,利用SSR分子标记对辐射材料进行DNA检测。10对引物集团选择结果表明,6对具有多态性,共获得10条多态性条带,平均每对引物有1.7条。单株检测共获得扩增条带28条,其中8条有多态性,多态性比率为28.9%。说明,辐射可引起紫色马铃薯黑美人表型和DNA水平的变异。  相似文献   

Effects of microsized rice straw on soil clay dispersibility     

Thu T. T. Tran  Trang T. Dao  Van M. Dinh  Trang T. T. Vu  Hue T. Nguyen  Phuong M. Nguyen  Thu H. A. Ngo  Minh N. Nguyen 《European Journal of Soil Science》2022,73(3):e13246

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竹重组材浸渍纸饰面工艺   总被引：1，自引：0，他引：1  

苏团  于再君  侯伦灯  王舒婷  郭福思 《林业科技开发》2014,(5)

通过正交试验,考察了树脂含量、残留挥发分、热压压力和热压时间等工艺因素对浸渍纸饰面竹重组材的表面胶合强度和耐磨性能的影响,探讨了浸渍纸饰面生产的较佳工艺参数。试验结果表明：树脂含量和残留挥发分对浸渍纸饰面竹重组材的表面胶合强度和耐磨性能影响显著。在试验条件下,适宜的饰面工艺为树脂含量200％,残留挥发分7％,热压压力2.9 MPa,热压时间40 s。  相似文献   

越南安息香的低温半致死温度与抗寒适应性     

阮俊阳  刘新亮  郁万文  曹福亮 《林业科技开发》2014,28(3)

以越南河内(Hanoi)、江西吉水(Jishui)、湖南资兴(Zixing)3个产地1年生越南安息香幼苗为试材,采用人工模拟低温处理技术进行低温处理,测定电解质外渗率,并配合Logistic方程对不同产地枝条的半致死温度(LT50)进行了拟合;测定低温处理下各产地越南安息香的MDA含量、根系活力,并观察不同产地越南安息香1年生幼苗的恢复情况.结果表明,3个产地越南安息香耐低温能力差异显著,半致死温度值LT50在-14.93～-9.48℃之间,抗寒性强弱排序依次为:Zixing＞ Jishui＞ Hanoi;幼苗叶片MDA含量、根系活力及抽条指数均反映出产地抗寒性强弱与半致死温度基本一致.  相似文献   

芦荟试管微克隆繁育中芽增殖体系的建立   总被引：1，自引：3，他引：1  

宋运贤  陈耀锋  傅建熙 《西北农林科技大学学报(自然科学版)》2002,30(6):107-109

研究了库拉索芦荟茎尖组织、叶盘组织和茎盘组织的离体培养特性,发现芦荟茎尖组织芽增殖效率较低,叶盘组织无再生能力,而茎盘组织是芦荟试管克隆芽增殖系建立的最佳外植体。利用茎盘组织建立微克隆增殖系与茎盘组织在茎段上的位置有关,库拉索短宿茎的中部茎段不定芽形成能力最强。细胞分裂素是诱导库拉索芦荟芽增殖的主要激素,但质量浓度过高,不定芽生长弱,玻璃化现象严重。1.0mg/L6-BA,1.5mg/LKT和0.5mg/LNAA组合的MB培养基(该培养基由MS培养基大量元素、微量元素、铁盐,B5培养基的有机物质构成)是库拉索芦荟试管苗增殖的最佳培养基。  相似文献   

The Biology of Isolated Chromatin: Chromosomes, biologically active in the test tube, provide a powerful tool for the study of gene action     

Bonner J  Dahmus ME  Fambrough D  Huang RC  Marushige K  Tuan DY 《Science (New York, N.Y.)》1968,159(3810):47-56

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Growth and wood basic density of acacia hybrid clones at three locations in Vietnam   总被引：1，自引：0，他引：1  

Le Dinh Kha  Chris E. Harwood  Nguyen Duc Kien  Brian S. Baltunis  Nguyen Dinh Hai  Ha Huy Thinh 《New Forests》2012,43(1):13-29

Field trials testing a total of 27 clones of the interspecific hybrid Acacia mangium × A. auriculiformis and seedling controls of the parental species were established at Ba Vi and Yen Thanh in the north of Vietnam and Long Thanh in the south. At both Ba Vi and Yen Thanh there were significant (P < 0.001) differences in height and diameter at breast height (DBH) among 22 tested clones at 4 years. At Long Thanh, twelve hybrid clones did not differ significantly in DBH at age 3 years, but did (P < 0.001) at age 5 years. At the two northern sites the acacia hybrid clones had significantly greater DBH than control seedlots of the parental species. At Long Thanh, DBH of the hybrid clones and A. mangium was similar, with a genetically improved seedlot of A. mangium displaying the best DBH. Mean wood basic density at breast height of the acacia hybrid clones was 539 kg m⁻³ at Yen Thanh at age 8 years, and 473 kg m⁻³ at Long Thanh at age 5 years; density for A. mangium at Long Thanh was only slightly lower than the hybrid clones at 461 kg m⁻³. Linear regressions of Pilodyn penetration (PP) at breast height on wood basic density explained 60% of the variance in density of treatments (clones and control seedlots) at Yen Thanh and 36% at Long Thanh. There were significant differences between hybrid clones in PP at all three trial sites. Clonal DBH performance was not strongly correlated across the three trial sites; Pearson correlations of clone mean DBH between pairs of sites ranged from −0.47 to 0.20. Clonal rankings for PP were more stable, with Pearson correlations between pairs of sites ranging from r = 0.71 to 0.78.  相似文献   

竹重组材微晶结构的X射线衍射分析     

侯伦灯  张齐生  苏团  洪敏雄 《林业科技开发》2012,26(2):19-22

运用X射线衍射分析(XRD)的检测手段,对冷压热固化与热压法两种生产模式的竹重组材试样进行分析,结果表明竹材纤维素是以微晶结构为基础的无定型结构,仅在衍射角2θ为22.5°附近出现较突出的晶体衍射峰,在衍射角16.7°、35°附近出现对应强度较弱的晶体衍射峰。冷压热固化与热压过程中,竹材纤维素结晶区主体结构未见明显变化,但相对结晶度有不同程度下降,对竹重组材的物理力学性能有所影响。  相似文献