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N.Torkel Welander 《Scientia Horticulturae》1983,21(3):283-290
Vegetatively propagated plants of Pelargonium × hortorum ‘Radio’ were grown at 8 combinations of irradiance and temperature levels; 4 or 22 W m?2 combined with 12, 15, 18 or 21°C. Increase in leaf number, leaf area, shoot and number of inflorescences per plant were all greater at 22 W m?2 than at 4 W m?2. At 22 W m?2, increase in temperature affected leaf number, leaf area and shoot number, but not inflorescence number. However, at 4 W m?2, number of inflorescences — but not leaf or shoot number — was affected by temperature. When effects of temperature differences were observed, the highest temperature resulted in the greatest number of leaves and shoots and the largest leaf area, but the lowest number of inflorescences per plant. The results indicate that photosynthesis or energy metabolism is of importance to floral initiation in Pelargonium × hortorum. 相似文献
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Mahdavi J Sondén B Hurtig M Olfat FO Forsberg L Roche N Angstrom J Larsson T Teneberg S Karlsson KA Altraja S Wadström T Kersulyte D Berg DE Dubois A Petersson C Magnusson KE Norberg T Lindh F Lundskog BB Arnqvist A Hammarström L Borén T 《Science (New York, N.Y.)》2002,297(5581):573-578
Helicobacter pylori adherence in the human gastric mucosa involves specific bacterial adhesins and cognate host receptors. Here, we identify sialyl-dimeric-Lewis x glycosphingolipid as a receptor for H. pylori and show that H. pylori infection induced formation of sialyl-Lewis x antigens in gastric epithelium in humans and in a Rhesus monkey. The corresponding sialic acid-binding adhesin (SabA) was isolated with the "retagging" method, and the underlying sabA gene (JHP662/HP0725) was identified. The ability of many H. pylori strains to adhere to sialylated glycoconjugates expressed during chronic inflammation might thus contribute to virulence and the extraordinary chronicity of H. pylori infection. 相似文献