大豆植株分杈数自动提取算法研究

根据大豆植株分杈个数可以预估大豆的产量。为了满足现代农业预测农产品产量的需要,本文提出一种大豆植株分杈数自动提取算法,即首先将采集到的大豆植株图片进行灰度变换、滤波、阈值分割得到二值图像,再进行形态学中的闭运算操作得到大豆植株的轮廓,然后基于Zhang并行快速细化算法提取骨架,最后借助改进的角点检测算法对大豆植株的所有分杈点进行标记并自动统计分杈数,仿真结果与大豆植株实际分杈点一致。     

饲料中添加不同水平的发酵豆渣对育肥猪生长性能、屠宰性能及经济效益指标的影响

为研究饲料中添加不同水平的发酵豆渣对育肥猪生长性能、屠宰性能及经济效益指标的影响,采用单因素随机设计试验,选择体重相近的健康育肥猪80头随机分成4组,每组20个重复,每个重复1头,1组饲喂基础日粮为对照组,试验2、3、4组分别在基础日粮中添加5%、10%、15%发酵豆渣,预试验7 d,试验期56 d。结果表明:(1)试验3、4组的平均日增重较1组比分别提高15.5%、14.1%(P<0.05),料重比较1组比分别降低14.7%、11.9%(P<0.05),试验2、3、4组的平均采食量均高于1组(P>0.05);(2)试验2、3、4组的宰前活重、屠宰率高于1组(P>0.05),试验3、4组的瘦肉率、眼肌面积较1组比分别提高12.1%、8.9%、12.3%、8.2%(P<0.05),背膘厚较1组比分别降低8.5%、7.0%(P<0.05);(3)试验3、4组毛利润较1组比分别提高22.4%、18.0%。综上,添加10%发酵豆渣可以提高育肥猪的生长性能、屠宰性能及经济效益。     

不同来源吸附载体大豆糖蜜对奶牛瘤胃内环境的影响

为考察不同来源吸附载体大豆糖蜜对奶牛瘤胃内环境的影响,采用3×3拉丁方试验设计,选用3头年龄相同(3胎次)、体重相近[(500±50)kg]且安装永久性瘤胃瘘管的中国荷斯坦奶牛为试验动物,分别饲喂基础日粮、豆皮糖蜜和麸皮糖蜜日粮。结果表明,豆皮糖蜜组和麸皮糖蜜组瘤胃pH均极显著高于对照组(P0.01),而豆皮糖蜜组和麸皮糖蜜组之间瘤胃pH没有显著差异(P0.05);麸皮糖蜜组瘤胃NH_3-N浓度显著低于对照组(P0.05),但与豆皮糖蜜组没有显著差异(P0.05);各处理间奶牛瘤胃各单个挥发性脂肪酸(volatile fatty acid,VFA,包括乙酸、丙酸、异丁酸、丁酸、异戊酸和戊酸)浓度、总VFA浓度和乙丙比均没有显著差异(P0.05);但与对照组相比,豆皮糖蜜组瘤胃总VFA浓度有降低趋势;而麸皮糖蜜组瘤胃总VFA浓度有提高趋势。结果显示,在奶牛饲料中可用豆皮糖蜜替代15%玉米以及用麸皮糖蜜替代6%玉米和10%麸皮,均具有调控瘤胃稳衡的作用,且麸皮糖蜜替代效果优于豆皮糖蜜。     

大豆抗原蛋白对幼龄动物致敏作用的研究进展

大豆抗原蛋白对幼龄动物的致敏作用及不易灭活性使其成为大豆及其制品在动物养殖中有效利用的主要瓶颈。本文从主要抗原蛋白的特性、致敏机制、对幼龄动物的影响、降低抗原蛋白的方法及有待进一步探索问题等方面进行了阐述,旨在为高效利用大豆及其制品,以及进一步深入研究提供参考。     

东北大豆种质群体在克山的表现及其潜在的育种意义

东北是我国大豆的主要生态区,克山是东北北部重要产区。本研究于2012-2014年,以搜集到的东北地区各单位现存的361份大豆地方品种和育成品种作为东北现存的本地种质,观察该群体在克山地区的表现,研究其在克山的潜在育种意义。获得以下主要结果:(1)东北大豆种质群体平均表现为全生育期133 d(103.8~157.0 d)、蛋白质含量39.69%(35.6%~44.38%)、油脂含量20.58%(17.47%~22.84%)、蛋脂总量60.27%(54.00%~63.97%)、百粒重17.61 g(6.13~28.17 g)、株高约96 cm(54.92~146.8 cm)、主茎19节(11.23~25.83)、分枝2.75个(0.22~7.63)、倒伏2级左右(1.00~4.00);(2)当地适合熟期组为MG 0和MG I,各性状的平均值与群体平均相近,其它熟期组在当地的表现与之不同。MG 000和MG 00的生育天数集中在110~120 d,比当地无霜期早约10~20 d,不能充分利用当地的自然条件;而品质性状表现则略优于MG 0和MG I,特别是油脂含量和蛋脂总量分别高约1%、1.5%;株高、节数均低于MG 0和MG I,分别低约10~40 cm、2~8节。MG II的生育天数在当地高达150 d,不能稳定正常成熟,不适合当地种植;品质性状表现低于当地品种水平,特别是蛋白质、蛋脂总量均低约2%,油脂低约0.5%;而株高、节数高于当地品种,分别高约10 cm、2节,倒伏程度则高达3级。MG III在克山不能正常成熟,导致其它性状表达不正常,生长量和倒伏度增加;(3)根据各农艺品质性状在克山表现的遗传进度估计,虽然油脂和蛋白质含量相对小些,但均有一定的改良潜力。克山地区利用东北大豆资源育成了许多适于东北北部的优异品种,体现了东北种质的重要作用。根据当地品种的表现,从供试的东北资源中提出了各农艺、品质性状改良可用的亲本品种名单,供育种工作者参考。     

水分胁迫下转DREB3基因抗旱大豆的生理反应

采用田间试验方法,在苗期和初花期自然状态、水分胁迫以及充足灌水条件下,研究了转DREB3基因抗旱大豆叶片、茎、根中超氧化物歧化酶(SOD)活性,丙二醛(MDA)、脯氨酸和蔗糖含量的变化。结果表明,在自然状态下,苗期水分胁迫第5天时,转DREB3基因抗旱大豆叶片SOD活性显著高于受体大豆东农50,初花期无明显变化;苗期和初花期转DREB3基因抗旱大豆叶片、茎和根中丙二醛、脯氨酸含量与受体大豆东农50相比无明显差异;苗期转DREB3基因抗旱大豆叶片和根中蔗糖含量显著低于受体大豆东农50,初花期差异不显著。在水分胁迫条件下,转DREB3基因抗旱大豆SOD活性显著高于受体大豆东农50,丙二醛含量显著低于受体大豆东农50,初花期水分胁迫第10天时叶片和茎中脯氨酸含量显著高于受体大豆东农50,蔗糖含量显著低于受体大豆东农50。充足灌水管理下,转DREB3基因抗旱大豆与受体大豆东农50相比,苗期和初花期叶片、茎和根中SOD活性、丙二醛和脯氨酸含量无明显差异;苗期转DREB3基因抗旱大豆叶片中蔗糖含量显著低于受体大豆东农50,但在初花期水分胁迫10天时转DREB3基因抗旱大豆叶片中蔗糖含量显著高于受体大豆东农50,苗期和初花期茎和根中蔗糖含量无显著差异。     

Whole-genome identiifcation and expression analysis of K+eflfux antiporter (KEA) and Na+/H+antiporter (NHX) families under abiotic stress in soybean

Sodium toxicity and potassium insufifcient are important factors affecting the growth and development of soybean in saline soil. As the capacity of plants to maintain a high cytosolic, K+/Na+ratio is t...     

Differences in Ion Accumulation and Salt Tolerance among Glycine Accessions

Salinity reduces crop yield by limiting water uptake and causing ion‐specific stress. Soybean [Glycine max (L.) Merr.] is sensitive to soil salinity. However, there is variability among soybean genotypes and wild relatives for salt tolerance, suggesting that genetic improvement may be possible. The objective of this study was to identify differences in salt tolerance based on ion accumulation in leaves, stems and roots among accessions of four Glycine species. Four NaCl treatments, 0, 50, 75 and 100 mm , were imposed on G. max, G. soja, G. tomentella and G. argyrea accessions with different levels of salinity tolerance. Tolerant genotypes had less leaf scorch and a greater capacity to prevent Na⁺ and Cl^? transport from soil solution to stems and leaves than sensitive genotypes. Magnitude of leaf injury per unit increase in leaf Na⁺ or Cl^? concentrations was lower in tolerant than in susceptible accessions. Also, plant injury was associated more with Na⁺ rather than with Cl^? concentration in leaves. Salt‐tolerant accessions had greater leaf chlorophyll‐meter readings than sensitive genotypes at all NaCl concentrations. Glycine argyrea and G. tomentella accessions possessed higher salt tolerance than G. soja and G. max genotypes.     

Evolution Analysis About Soybean MIR166 Family

MicroRNA(miRNA) is a class of important regulating non-coding small molecular RNA. The gma-MIR166 gene family consists of 21 members and their expression patterns diversify widely. It is important to analyze the evolution of gma-MIR166 gene family in order to understand the evolutionary mechanisms of miRNAs in soybean. In this study, we implemented soybean wide genome block analysis, the molecular phylogeny of gma-MIR166 and block analysis of gma-MIR166 family. The results showed that both chromosome big segmental duplications and tandem duplications were main reasons contributed to the expanding of gmaMIR166 gene family. These findings suggested that gma-MIR166 gene family might originate from one or two ancient miRNA genes. The results of research provided a support for evolutionary study of miRNAs in soybean and related species in Fabaceae.