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排序方式: 共有233条查询结果,搜索用时 46 毫秒
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C Crone J Frokjaer-Jensen JJ Friedman O Christensen 《The Journal of general physiology》1978,71(2):195-220
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Maria Antonia M. Barbosa Daniel H. Chitwood Arista A. Azevedo Wagner L. Araújo Dimas M. Ribeiro Lzaro E.P. Peres Samuel C.V. Martins Agustin Zsgn 《Plant, cell & environment》2019,42(5):1575-1589
Coordination between structural and physiological traits is key to plants' responses to environmental fluctuations. In heterobaric leaves, bundle sheath extensions (BSEs) increase photosynthetic performance (light‐saturated rates of photosynthesis, Amax) and water transport capacity (leaf hydraulic conductance, Kleaf). However, it is not clear how BSEs affect these and other leaf developmental and physiological parameters in response to environmental conditions. The obscuravenosa (obv) mutation, found in many commercial tomato varieties, leads to absence of BSEs. We examined structural and physiological traits of tomato heterobaric and homobaric (obv) near‐isogenic lines grown at two different irradiance levels. Kleaf, minor vein density, and stomatal pore area index decreased with shading in heterobaric but not in homobaric leaves, which show similarly lower values in both conditions. Homobaric plants, on the other hand, showed increased Amax, leaf intercellular air spaces, and mesophyll surface area exposed to intercellular airspace (Smes) in comparison with heterobaric plants when both were grown in the shade. BSEs further affected carbon isotope discrimination, a proxy for long‐term water‐use efficiency. BSEs confer plasticity in traits related to leaf structure and function in response to irradiance levels and might act as a hub integrating leaf structure, photosynthetic function, and water supply and demand. 相似文献
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Helena Bacha Lopes Gileade Pereira Freitas Daianne Maciely Carvalho Fantacini Virginia Picanço-Castro Dimas Tadeu Covas Adalberto Luiz Rosa Marcio Mateus Beloti 《Journal of cellular biochemistry》2019,120(10):16723-16732
Topographical modifications of titanium (Ti) at the nanoscale level generate surfaces that regulate several signaling pathways and cellular functions, which may affect the process of osseointegration. Here, we investigated the participation of integrin αV in the osteogenic capacity of Ti with nanotopography. Machined titanium discs (untreated) were submitted to treatment with H2SO4/H2O2 to produce the nanotopography (nanostructured). First, the greater osteogenic capacity of the nanotopography that increased osteoblast differentiation of mesenchymal stem cells compared with untreated topography was shown. Also, the nanostructured surface increased (regulation ≥ 1.9-fold) the gene expression of 6 integrins from a custom array plate utilized to evaluate the gene expression of 84 genes correlated with cell adhesion signaling pathway, including integrin αV, which is involved in osteoblast differentiation. By silencing integrin αV in MC3T3-E1 cells cultured on nanotopography, the impairment of osteoblast differentiation induced by this surface was observed. In conclusion, it was shown that nanotopography regulates the expression of several components of the cell adhesion signaling pathway and its higher osteogenic potential is, at least in part, due to its ability to upregulate the expression of integrin αV. Together with previous data that showed the participation of integrins α1, β1, and β3 in the nanotopography osseoinduction activity, we have uncovered the pivotal role of this family of membrane receptors in the osteogenic potential of this surface. 相似文献
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Luís Eduardo Fernandes Rodrigues da Conceição Margarete Alice Fontes Saraiva Raphael Hermano Santos Diniz Juliana Oliveira Gustavo Dimas Barbosa Florencia Alvarez Lygia Fátima da Mata Correa Hygor Mezadri Mauricio Xavier Coutrim Robson José de Cássia Franco Afonso Candida Lucas Ieso Miranda Castro Rogelio Lopes Brandão 《Journal of industrial microbiology & biotechnology》2015,42(2):237-246