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101.
JAMES A. DVORAK THOMAS E. HALL MARK ST. J. CRANE JUAN C. ENGEL JAMES P. McDANIEL RODOLFO URIEGAS 《The Journal of eukaryotic microbiology》1982,29(3):430-437
ABSTRACT. Total DNA/organism was determined by flow cytometry on stocks of 33 single-cell-isolate clones and one strain of mithramycin-stained Trypanosoma cruzi. Interstrain differences in mean total DNA/group of 34% and interclone differences in total DNA/organism of 41% were found. Microspectrofluorometric analyses of the trypomastigote stage of selected clones confirmed the flow cytometry data and indicated that the total DNA/organism differences were due to differences in DNA of both the nucleus and kinetoplast with the nucleus being the major contributing factor. These data imply that the potential for genetic diversity in T. cruzi may be very large. 相似文献
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VINCENT GRANDPERRET VALÉRIE NICOLAS‐FRANCÈS DAVID WENDEHENNE STÉPHANE BOURQUE 《Plant, cell & environment》2014,37(6):1259-1269
Since the beginning of the 21st century, numerous studies have concluded that the plant cell nucleus is one of the cellular compartments that define the specificity of the cellular response to an external stimulus or to a specific developmental stage. To that purpose, the nucleus contains all the enzymatic machinery required to carry out a wide variety of nuclear protein post‐translational modifications (PTMs), which play an important role in signal transduction pathways leading to the modulation of specific sets of genes. PTMs include protein (de)acetylation which is controlled by the antagonistic activities of histone acetyltransferases (HATs) and histone deacetylases (HDACs). Regarding protein deacetylation, plants are of particular interest: in addition to the RPD3‐HDA1 and Sir2 HDAC families that they share with other eukaryotic organisms, plants have developed a specific family called type‐II HDACs (HD2s). Interestingly, these HD2s are well conserved in plants and control fundamental biological processes such as seed germination, flowering or the response to pathogens. The aim of this review was to summarize current knowledge regarding this fascinating, but still poorly understood nuclear protein family. 相似文献
105.
GREGORY R. CAWTHRAY BEATRICE ENCKE PATRICK GIAVALISCO ALEXANDER IVAKOV STÉPHANIE ARRIVAULT RICARDA JOST NICOLE KROHN JOHN KUO ETIENNE LALIBERTÉ STUART J. PEARSE JOHN A. RAVEN WOLF‐RÜDIGER SCHEIBLE FRANÇOIS TESTE ERIK J. VENEKLAAS MARK STITT HANS LAMBERS 《Plant, cell & environment》2014,37(6):1276-1298
Proteaceae species in south‐western Australia occur on phosphorus‐ (P) impoverished soils. Their leaves contain very low P levels, but have relatively high rates of photosynthesis. We measured ribosomal RNA (rRNA) abundance, soluble protein, activities of several enzymes and glucose 6‐phosphate (Glc6P) levels in expanding and mature leaves of six Proteaceae species in their natural habitat. The results were compared with those for Arabidopsis thaliana. Compared with A. thaliana, immature leaves of Proteaceae species contained very low levels of rRNA, especially plastidic rRNA. Proteaceae species showed slow development of the photosynthetic apparatus (‘delayed greening’), with young leaves having very low levels of chlorophyll and Calvin–Benson cycle enzymes. In mature leaves, soluble protein and Calvin–Benson cycle enzyme activities were low, but Glc6P levels were similar to those in A. thaliana. We propose that low ribosome abundance contributes to the high P efficiency of these Proteaceae species in three ways: (1) less P is invested in ribosomes; (2) the rate of growth and, hence, demand for P is low; and (3) the especially low plastidic ribosome abundance in young leaves delays formation of the photosynthetic machinery, spreading investment of P in rRNA. Although Calvin–Benson cycle enzyme activities are low, Glc6P levels are maintained, allowing their effective use. 相似文献
106.
ADP-glucose pyrophosphorylase (AGPase), a key enzyme involved in higher plant starch biosynthesis, is composed of pairs of
large (LS) and small subunits (SS). Ample evidence has shown that the AGPase catalyzes the rate limiting step in starch
biosynthesis in higher plants. In this study, we compiled detailed comparative information about ADP glucose pyrophosphorylase
in selected plants by analyzing their structural features e.g. amino acid content, physico-chemical properties, secondary structural
features and phylogenetic classification. Functional analysis of these proteins includes identification of important 10 to 20 amino
acids long motifs arise because specific residues and regions proved to be important for the biological function of a group of
proteins, which are conserved in both structure and sequence during evolution. Phylogenetic analysis depicts two main clusters.
Cluster I encompasses large subunits (LS) while cluster II contains small subunits (SS). 相似文献
107.
Marta S. Lopes Matthew P. Reynolds C. Lynne McIntyre Ky L. Mathews M. R. Jalal Kamali Moussa Mossad Yousef Feltaous Izzat S. A. Tahir Ravish Chatrath Francis Ogbonnaya Michael Baum 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2013,126(4):971-984
Heat and drought adaptive quantitative trait loci (QTL) in a spring bread wheat population resulting from the Seri/Babax cross designed to minimize confounding agronomic traits have been identified previously in trials conducted in Mexico. The same population was grown across a wide range of environments where heat and drought stress are naturally experienced including environments in Mexico, West Asia, North Africa (WANA), and South Asia regions. A molecular genetic linkage map including 475 marker loci associated to 29 linkage groups was used for QTL analysis of yield, days to heading (DH) and to maturity (DM), grain number (GM2), thousand kernel weight (TKW), plant height (PH), canopy temperature at the vegetative and grain filling stages (CTvg and CTgf), and early ground cover. A QTL for yield on chromosome 4A was confirmed across several environments, in subsets of lines with uniform allelic expression of a major phenology QTL, but not independently from PH. With terminal stress, TKW QTL was linked or pleiotropic to DH and DM. The link between phenology and TKW suggested that early maturity would favor the post—anthesis grain growth periods resulting in increased grain size and yields under terminal stress. GM2 and TKW were partially associated with markers at different positions suggesting different genetic regulation and room for improvement of both traits. Prediction accuracy of yield was improved by 5 % when using marker scores of component traits (GM2 and DH) together with yield in multiple regression. This procedure may provide accumulation of more favorable alleles during selection. 相似文献
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JUAN C. ENGEL JAMES A. DVORAK ELSA L. SEGURA MARK ST. J. CRANE 《The Journal of eukaryotic microbiology》1982,29(4):555-560
Nineteen clones of Trypanosoma cruzi were obtained as single-cell isolates from Triatoma infestans. Ten of the clones were isolates from a patient with chronic Chagas' disease; nine clones were isolates from a dog infected with T. cruzi strain CA-I isolated originally from a chronic chagasic patient. The growth kinetics and peak modal Coulter volume of these clones were characterized. Significant inter- and intra-group differences between growth rates and peak modal volumes were found. These data indicate that subpopulations and, consequently, genetic heterogeneity of T. cruzi exist in chronic chagasic patients. All of the clones infected vertebrate cells in vitro. 相似文献
110.
ST Kew 《BMC research notes》2010,3(1):342