Physiological characteristics of high yield under cluster planting: photosynthesis and canopy microclimate of cotton     

Ting-ting Xie  Pei-xi Su  Li-zhe An  Li-shan Shan  Zi-juan Zhou  Zhong-ping Chai 《Plant Production Science》2016,19(1):165-172

Cotton produces more biomass and economic yield when cluster planting pattern (three plants per hole) than in a traditional planting pattern (one plant per hole), even at similar plant densities, indicating that individual plant growth is promoted by cluster planting. The causal factors for this improved growth induced by cluster planting pattern, the light interception, canopy microclimate and photosynthetic rate of cotton were investigated in an arid region of China. The results indicated that the leaf area index and light interception were higher in cluster planting, and significantly different from those in traditional planting during the middle and late growth stages. Cotton canopy humidity at different growth stages was increased but canopy temperatures were reduced by cluster planting. In the later growth stage of cluster planting, the leaf chlorophyll content was higher and the leaf net photosynthetic rate and canopy photosynthetic rate were significantly increased in comparing with traditional planting pattern. We concluded that differences in canopy light interception and photosynthetic rate were the primary factors responsible for increased biomass production and economic yield in cluster planting compared with the traditional planting of cotton.  相似文献   

A型流感病毒分型基因芯片在流感病毒各亚型监测中的应用     

王慧煜  郑家昊  梅琳  孔玉方  林祥梅  杨素  韩雪清 《中国动物检疫》2020,37(5):111-115

为验证自行研制的A型流感病毒分型基因芯片方法在实际中的应用效果,了解A型流感病毒各亚型在我国不同地区和不同宿主中的分布情况,对我国20个地区、不同宿主源(鸡、鸭、鹌鹑、鸽子、猪、人等)拭子和组织样品共16 852份进行了检测。利用自行研制的A型流感病毒分型基因芯片方法,对样品进行RNA提取、多重不对称RT-PCR扩增、芯片杂交、洗涤和扫描分析;同时将基因芯片检测阳性的样品,用普通RT-PCR扩增后进行序列测定。结果显示:利用该方法检出阳性样品2 582份,总检出率为15.32%(2 582/16 852),共检测到H1N1、H2N9、H3N2、H4N6、H5N1、H7N1、H7N9、H9N2、H10N5、H16N3等10个亚型,且均与阳性样品测序结果一致。结果表明,该方法可准确检测不同地区、不同宿主中的A型流感病毒不同亚型。同时,该方法能在同一张芯片上准确鉴定A型流感病毒的多种亚型,解决了其他常规方法无法检测已发现和可能发生变异的所有亚型的棘手问题,从而为A型流感诊断和分子流行病学监测提供了一种新技术。  相似文献   

柞蚕幼虫黄体色与白体色的遗传分析及类胡萝卜素组成比较     

苏鑫  郭剑  刘珅凯  李群  李响  王奇  李木旺  潘茂华  刘彦群 《蚕业科学》2021,47(5):430-434

为深入探讨柞蚕幼虫体色多样性的形成机制,分析柞蚕品种豫大1号(黄体色)和白一化(白体色,略带黄色)幼虫体色的遗传规律,并比较二者在体壁类胡萝卜素组成上的差异.杂交试验发现,F1的幼虫体色为黄色,F2有黄色和白色两种表型,且分离比符合3∶1;回交BC1(F1×豫大1号)均为黄色,而BC1(F1×白一化)则有两种表型,即黄色和白色,分离比符合1∶1.遗传分析表明,豫大1号的基因型为YYGG,白一化的基因型为YYgg,豫大1号的黄体色对白一化的白体色属于完全显性遗传.代谢组学分析发现,豫大1号中的类胡萝卜素含量(10.259μg/g)远高于白一化(1.167μg/g);白一化体壁中的叶黄素、β-胡萝卜素和玉米黄质含量远小于豫大1号.综上认为,体壁中类胡萝卜素的缺乏是导致白一化形成白体色的原因之一.  相似文献   

设置创新创业教育专业——破解创新创业教育改革困境的范式转换     

苏红伟  唐兴芳 《高等农业教育》2017,(3)

培养创新人才是不同发展阶段、不同形态社会对教育的基本诉求。通过对我国部属农林高校创新创业教育改革实施方案文本分析可知,在开展创新创业教育改革发展目标方面高度认同,在组织机构设置方面高度重视,在选择举措方面高度完备。同时存在目标定位无特色又高度雷同,相关部门间协同育人机制缺失以及对发力点缺乏明晰的判断等问题。推进范式转换,设置创新创业教育专业、建立创新创业教育监督执行机构成为当下破解创新创业教育改革困境的重要选择。  相似文献   

四家动物园观赏肉食动物消化道寄生虫感染情况调查     

王宇  邹希明  张丽冰  付雪  宿欣  高远  王春仁 《黑龙江八一农垦大学学报》2017,29(1)

为了解哈尔滨北方森林动物园、佳木斯水源山公园、齐齐哈尔龙沙动植物园和鸡西动物园观赏肉食动物寄生蠕虫的感染情况,于2015年3~6月采用饱和盐水漂浮法和水洗沉淀法对四家动物园的5科94只观赏肉食动物的粪便进行了虫卵检查,结果有18只动物检出虫卵,阳性率为19.2%(18/94),蛔虫卵为常见虫种。本调查为四家动物园肉食动物消化道寄生虫病防治提供了科学依据。  相似文献   

水泥混凝土桥面铺装层最不利荷载位置的确定     

徐永丽  程培峰  孙志明 《森林工程》2013,(2):93-95

采用ABAQUS方法建立了三维足尺寸钢筋混凝土T型梁桥以及沥青混凝土铺装层实体模型,分析不同荷载工况下铺装层内部以及层间胶结界面的纵、横向切应力变化规律,确定了最不利荷载的位置为横桥向工况二、纵桥向位于L/8的荷位,结果可作为桥面铺装体系力学行为的基础。  相似文献   

微酸性电解水对家蚕黑胸败血芽孢杆菌的杀灭效果及机制研究   总被引：1，自引：0，他引：1  

丁琳琳  苏斌  王文文  苗玲芝  孙晓梅  郭红伟  高绘菊 《蚕业科学》2021,47(2):156-162

微酸性电解水作为一种安全、高效、广谱的新型消毒剂,具有制备简单、成本低、使用后无残留、对人体无毒无害等优点.研究微酸性电解水对家蚕黑胸败血芽孢杆菌的杀灭效果及其杀菌机制,为其在蚕桑生产中的应用奠定基础.体外抑菌试验结果表明,有效氯质量浓度为40 mg/L、pH5.5、氧化还原电位(ORP)为1100 mV的微酸性电解水处理5 min即可全部杀灭家蚕黑胸败血芽孢杆菌.生物学试验结果表明,该电解水对家蚕黑胸败血芽孢杆菌处理5 min后,家蚕黑胸败血芽孢杆菌的灭活率达到90％;处理15 min时,灭活率为100％.经微酸性电解水处理后,家蚕黑胸败血芽孢杆菌的外部形态发生改变,菌体膨胀、逐渐伸长,之后出现孔洞,最后菌体破裂、死亡;胞外电导率、可溶性蛋白含量和可溶性糖含量逐渐增加;菌体DNA发生降解.试验结果表明微酸性电解水主要通过破坏家蚕黑胸败血芽孢杆菌细胞外部形态,改变细胞膜通透性,导致细胞内容物外渗,DNA结构受到破坏,达到杀菌目的 .  相似文献   

Microbial community structure of the bovine rumen as affected by feeding cashew nut shell liquid,a methane-inhibiting and propionate-enhancing agent     

Chisato Su  Takumi Shinkai  Nodoka Miyazawa  Makoto Mitsumori  Osamu Enishi  Kyo Nagashima  Satoshi Koike  Yasuo Kobayashi 《Animal Science Journal》2021,92(1):e13503

  相似文献   

Phylogenetic analysis of Myanmar indigenous chickens using mitochondrial D-loop sequence reveals their characteristics as a genetic resource     

Su Lai Yee Mon  Moe Lwin  Aye Aye Maw  Lat Lat Htun  Saw Bawm  Kotaro Kawabe  Yasuhiko Wada  Shin Okamoto  Takeshi Shimogiri 《Animal Science Journal》2021,92(1):e13647

Myanmar indigenous chickens play important roles in food, entertainment, and farm business for the people of Myanmar. In this study, complete mitochondrial D-loop sequences (1232 bp) were analyzed using 176 chickens, including three indigenous breeds, two fighting cock populations, and three indigenous populations to elucidate genetic diversity and accomplish a phylogenetic analysis of Myanmar indigenous chickens. The average haplotype and nucleotide diversities were 0.948 ± 0.009 and 0.00814 ± 0.00024, respectively, exhibiting high genetic diversity of Myanmar indigenous chickens. Sixty-four haplotypes were classified as seven haplogroups, with the majority being haplogroup F. The breeds and populations except Inbinwa had multiple maternal haplogroups, suggesting that they experienced no recent purifying selection and bottleneck events. All breeds and populations examined shared haplogroup F. When 232 sequences belonging to haplogroup F (79 from Myanmar and 153 deposited sequences from other Asian countries/region) were analyzed together, the highest genetic diversity was observed in Myanmar indigenous chickens. Furthermore, Myanmar indigenous chickens and red junglefowls were observed in the center of the star-like median-joining network of 37 F-haplotypes, suggesting that Myanmar is one of the origins of haplogroup F. These findings revealed the unique genetic characteristic of Myanmar indigenous chickens as important genetic resources.  相似文献   

冬小麦种质“矮孟牛”中新型小麦-黑麦复杂易位的遗传传递分析   总被引：8，自引：3，他引：8  

亓增军  刘大钧  陈佩度  王苏玲  李斯深  李晴祺 《作物学报》2001,27(5):582-589

本文利用矮孟牛中一种新型小麦-黑麦复杂易位IRS·7DS,1BL·7DL与1BL·1RS易位所构建的一套重组自交系(包括109个F6株系)和8个矮孟牛衍生品种进行了分析,结果表明在109个F6株系中,纯合复杂易位占69个,纯合1BL·1RS占36个,二者比例约2∶1,杂合类型占4个,出现频率4/109;对矮孟牛8个衍生品种的分析表明,6个品种包含来自矮孟牛的  相似文献