Leaf photosynthesis is enhanced in normal oil maize pollinated by high oil maize hybrids     

R.F. Wang  D.G. An  Q.E. Xie  G.M. Jiang  K.J. Wang 《Industrial Crops and Products》2009,29(1):182-188

The grain yield of normal oil maize (Zea mays L.) might increase when pollinated by high oil maize (HOM) hybrids because of heterosis. To testify that the grain yield increase might be a result of improved photosynthetic rate and related traits, the normal oil maize (NOM) hybrid, Nongda108, was cross-pollinated by three HOM hybrids, HOM202, HOM115 and HOM4515 (for short as ND108pHOM202, ND108pHOM115 and ND108pHOM4515). We found that the ND108pHOM202 and ND108pHOM115 exhibited higher net photosynthetic rate (P_n), accompanied by larger stomatal conductance (g_s) and transpiration rate (E). Moreover, delayed leaf senescence was observed in their leaves, including larger leaf area index (LAI) and higher Chl content and Chl a/b ratio. Apart from higher phosphoenolpyruvate carboxylase (PEPCase) activity, the soluble proteins were also higher in the two cross-pollinations. The higher leaf photosynthesis could explain the grain increase in ND108pHOM202 and ND108pHOM115. However, ND108pHOM4515 exhibited a decreased photosynthetic characteristic and yield performance. Significantly positive relation between grain yield and biomass (r² = 0.96, P < 0.05), P_n and biomass (r² = 0.74, P < 0.05) also suggested that the yield increase in the two cross-pollination treatments was generally owing to the higher photosynthetic rate and related photosynthetic traits.  相似文献   

Guinea pig herpesvirus detected as a guinea pig kidney cell culture contaminant in Mexico     

S Suzuki  A Fukusho  Y Miura  J A Ibarrondo  J Shirai  M Nakamura  S Ikeda 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1985,47(5):711-717

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农机新燃料生物柴油的特性及对环境的影响   总被引：1，自引：0，他引：1  

刘蕾  牛俊玲  姜灵彦 《农机化研究》2009,31(4)

生物燃料是以生物质为载体的能源,直接或间接来源于植物的光合作用,是可替代石化柴油的一种可再生能源,现已开始应用于农业机械领域.为此,阐述了生物柴油的特性,重点分析了生物柴油在生产及农机使用过程中产生的污染成分及对环境的影响,通过与传统的石化柴油作对比,指出了生物柴油作为农机新燃料的优势,同时也提出了许多亟待解决的问题.  相似文献   

The relation between pathogenicity and plaque size of Getah virus Kanagawa strain in suckling mice     

T Hohdatsu  N Takahasi  S Ide  H Yamagishi  H Saito  Y Fujisaki  H Koyama 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1990,52(3):519-526

The relation among biological properties, particularly pathogenicity for suckling mice, and plaque size was studied in four virus strains: Getah virus strain Kanagawa; two strains obtained by plaque cloning of the Kanagawa strain, Getah Kanagawa SP (G-K-SP) strain which forms small plaques (SP) only and strain G-K-LP which forms large plaques (LP) only; and strain Haruna which forms SP only. There were no marked differences among the four strains in serological properties, growth curves and sensitivity to pH, trypsin and temperature. Strain G-K-LP showed higher pathogenicity for suckling mice than strain G-K-SP. However, the pathogenicity of strain Haruna, which forms SP only, was as high as that of strain G-K-LP. Some of the clones in SP of strain Kanagawa kill all mice in 5 to 6 days after inoculation while the others required 9 to 11 days or longer before causing death. The present study showed that the pathogenicity of Getah viruses shortly after being isolated from the field, such as the Kanagawa strain, is different between large and small plaques, and even among small plaques, at least in suckling mice, and that the pathogenicity has no relation to plaque size.  相似文献   

Existence of feline immunodeficiency virus infection in Japanese cat population since 1968   总被引：2，自引：0，他引：2  

T Furuya  Y Kawaguchi  T Miyazawa  Y Fujikawa  Y Tohya  M Azetaka  E Takahashi  T Mikami 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1990,52(4):891-893

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生态庭院经济与农业产业化经营结合的途径探讨     

谢江 《湖南农机》2009,36(1):53-54

积极推进生态庭院经济与农业产业化经营的结合，是对中国农村经济发展模式的新探索。这对于重塑生态庭院经济形象，提升生态庭院经济档次，建设社会主义新农村，增加农民收入，促进农村社会稳定具有时分重要的意义，因此需要进一步加大力度探索二者结合的有效途径。  相似文献   

仔猪色氨酸研究新进展   总被引：1，自引：0，他引：1  

蒋志荣  石敏 《饲料工业》2009,30(3)

<正>色氨酸(Trp)是仔猪日粮中排于赖氨酸、苏氨酸、蛋氨酸之后的第4限制性氨基酸。它除了有助于蛋白质沉积,最重要的作用就是对适口性和采食量的调  相似文献   

亚洲黑熊COI序列变异及其DNA条码的应用     

鲁再丰  蒋国红  白素英 《东北林业大学学报》2010,38(10)

利用DNA编码技术对亚洲黑熊东北亚种和指名亚种不同个体进行DNA编码,结合Genbank中亚洲黑熊台湾亚种和四川亚种以及熊科相关物种的序列构建系统发育树,并与12SrRNA基因进行比较。研究结果表明,亚洲黑熊COI基因变异显著,各亚种分化明显。系统树显示,亚洲黑熊和美洲黑熊遗传分化明显,且不是姐妹群;北极熊和棕熊关系较近,为姐妹群。COI作为DNA条码在研究亚洲黑熊的分类地位和进化关系上是有效的。在解决亚种分化及关系时,COI基因比12SrRNA基因更有效。  相似文献   

Protein extraction from rice (<Emphasis Type="Italic">Oryza sativa</Emphasis> L.) root for two-dimensional electrophresis     

Xiaoliang Xiang  Shuju Ning  Xia Jiang  Xiaogui Gong  Renlei Zhu  Lanfang Zhu  Daozhi Wei 《Frontiers of Agriculture in China》2010,4(4):416-421

An efficient protein extraction method for two-dimensional gel electrophoresis (2-DE) from plant samples is usually challenging due to the low protein content and high level of interfering compounds. Proteomic analyses of rice (Oryza sativa L.) roots are limited by the lack of an efficient protein extraction method. To establish an effective protocol of protein extraction suitable for 2-DE analysis in rice roots, we evaluated three protein extraction methods (trichloroacetic acid [TCA]/acetone, Mg/NP-40/TCA, and tris-base/acetone). Our results showed that the Mg/NP-40/TCA extraction method had the highest protein yield and is the best resolution of protein separation among the three methods. The TCA/acetone method exhibited clear protein profiles and detected more protein spots with the highest intensity in the region of high Mr (above 45 kDa) than the other methods. However, this method was unable to detect proteins with low-Mr (less than 24.0 kDa). The Tris-base/acetone method showed the poorest resolution of protein separation. Our results suggest that the Mg/NP-40/TCA method was the most effective among the three methods and may provide enhanced proteomic information for rice and other crop roots.  相似文献   

晚熟蟠桃新品种‘瑞蟠4号''     

姜全  郭继英  郑书旗 《园艺学报》1999,26(4):277-277

‘瑞蟠４号’系以‘晚熟大蟠桃’＊‘扬州１２４蟠’育民的晚熟蟠桃新品种。该品种果实发育期约１３４ｄ，平均单果质量２２１ｇ。果实扁平形，白肉，硬溶质，味甜，粘核。  相似文献