scholarly journals Low Magnesium with High Potassium Supply Changes Sugar Partitioning and Root Growth Pattern Prior to Visible Magnesium Deficiency in Leaves of Rice (<i>Oryza sativa</i> L.)

2011 ◽  
Vol 02 (04) ◽  
pp. 601-608 ◽  
Author(s):  
Yuchuan Ding ◽  
Guohua Xu
Keyword(s):  
Oryza Sativa ◽  
Root Growth ◽  
Growth Pattern ◽  
Magnesium Deficiency ◽  
High Potassium ◽  
Low Magnesium ◽  
Potassium Supply

scholarly journals Water uptake dynamics under progressive drought stress in diverse accessions of the OryzaSNP panel of rice (Oryza sativa)

2012 ◽  
Vol 39 (5) ◽  
pp. 402 ◽  
Author(s):  
Veeresh R. P. Gowda ◽  
Amelia Henry ◽  
Vincent Vadez ◽  
H. E. Shashidhar ◽  
Rachid Serraj
Keyword(s):  
Oryza Sativa ◽  
Drought Stress ◽  
Root Growth ◽  
Water Uptake ◽  
Root Length Density ◽  
Oryza Sativa L ◽  
Root Water Uptake ◽  
Snp Markers ◽  
Drought Response ◽  
Genotypic Differences

In addition to characterising root architecture, evaluating root water uptake ability is important for understanding drought response. A series of three lysimeter studies were conducted using the OryzaSNP panel, which consists of 20 diverse rice (Oryza sativa L.) genotypes. Large genotypic differences in drought response were observed in this genotype panel in terms of plant growth and water uptake. Total water uptake and daily water uptake rates in the drought-stress treatment were correlated with root length density, especially at depths below 30 cm. Patterns of water uptake among genotypes remained consistent throughout the stress treatments: genotypes that initially extracted more water were the same genotypes that extracted more water at the end of the study. These results suggest that response to drought by deep root growth, rather than a conservative soil water pattern, seems to be important for lowland rice. Genotypes in the O. sativa type aus group showed some of the greatest water uptake and root growth values. Since the OryzaSNP panel has been genotyped in detail with SNP markers, we expect that these results will be useful for understanding the genetics of rice root growth and function for water uptake in response to drought.

Small increases in dietary calcium above normal requirements exacerbate magnesium deficiency in rats fed a low magnesium diet

2014 ◽  
Vol 27 (1) ◽  
pp. 35-47 ◽  
Author(s):  
Jesse Bertinato ◽  
Christopher Lavergne ◽  
Louise J. Plouffe ◽  
Hiba Abou El Niaj
Keyword(s):  
Magnesium Deficiency ◽  
Dietary Calcium ◽  
Low Magnesium

scholarly journals CBL-INTERACTING PROTEIN KINASE 9 regulates ammonium-dependent root growth downstream of IDD10 in rice (Oryza sativa)

2019 ◽  
Vol 124 (6) ◽  
pp. 947-960 ◽  
Author(s):  
Yuan Hu Xuan ◽  
Vikranth Kumar ◽  
Xiao Han ◽  
Sung Hoon Kim ◽  
Jin Hee Jeong ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Protein Kinase ◽  
Root Growth ◽  
Target Genes ◽  
Primary Root ◽  
Ammonium Transporter ◽  
Growth Defect ◽  
Mobility Shift ◽  
Interacting Protein ◽  
Low Efficiency

Abstract Background and Aims INDETERMINATE DOMAIN 10 (IDD10) is a key transcription factor gene that activates the expression of a large number of NH4+-responsive genes including AMMONIUM TRANSPORTER 1;2 (AMT1;2). Primary root growth of rice (Oryza sativa) idd10 mutants is hypersensitive to NH4+. The involvement of CALCINEURIN B-LIKE INTERACTING PROTEIN KINASE (CIPK) genes in the action of IDD10 on NH4+-mediated root growth was investigated. Methods Quantitative reverse transcription–PCR was used to analyse NH4+- and IDD10-dependent expression of CIPK genes. IDD10-regulated CIPK target genes were identified using electrophoretic mobility shift assays, chromatin immunoprecipitation and transient transcription assays. Root growth rate, ammonium content and 15N uptake of cipk mutants were measured to determine their sensitivity to NH4+ and to compare these phenotypes with those of idd10. The genetic relationship between CIPK9 OX and idd10 was investigated by crosses between the CIPK9 and IDD10 lines. Key Results AMT1;2 was overexpressed in idd10 to determine whether NH4+-hypersensitive root growth of idd10 resulted from limitations in NH4+ uptake or from low cellular levels of NH4+. High NH4+ levels in idd10/AMT1;2 OX did not rescue the root growth defect. Next, the involvement of CIPK genes in NH4+-dependent root growth and interactions between IDD10 and CIPK genes was investigated. Molecular analysis revealed that IDD10 directly activated transcription of CIPK9 and CIPK14. Expression of CIPK8, 9, 14/15 and 23 was sensitive to exogenous NH4+. Further studies revealed that cipk9 and idd10 had almost identical NH4+-sensitive root phenotypes, including low efficiency of 15NH4+ uptake. Analysis of plants containing both idd10 and CIPK9 OX showed that CIPK9 OX could rescue the NH4+-dependent root growth defects of idd10. Conclusions CIPK9 was involved in NH4+-dependent root growth and appeared to act downstream of IDD10. This information will be useful in future explorations of NH4+ signalling in plants.

Effects of aluminium on root growth and apical root cells in rice (Oryza sativa L.) cultivars. Reliability of screening tests to detect Al resistance at the seedling stage

2009 ◽  
Vol 31 (6) ◽  
pp. 1255-1262 ◽  
Author(s):  
Cristiane Elizabeth Costa de Macêdo ◽  
Veronique Van Sint Jan ◽  
Jean-Marie Kinet ◽  
Stanley Lutts
Keyword(s):  
Oryza Sativa ◽  
Root Growth ◽  
Oryza Sativa L ◽  
Seedling Stage ◽  
Screening Tests ◽  
Root Cells

scholarly journals Unusual pattern of ribonucleic acid components in the ribosome of Crithidia fasciculata, a trypanosomatid protozoan.

1981 ◽  
Vol 1 (4) ◽  
pp. 347-357 ◽  
Author(s):  
M W Gray
Keyword(s):  
Ribosomal Rna ◽  
Ribonucleic Acid ◽  
Large Subunit ◽  
Ribosomal Subunit ◽  
Ribosomal Rnas ◽  
High Potassium ◽  
Intact Cells ◽  
Crithidia Fasciculata ◽  
Low Magnesium ◽  
Chain Lengths

In a previous study from this laboratory, presumptive ribosomal ribonucleic acid (RNA) species were identified in the total cellular RNA directly extracted from intact cells of the trypanosomatid protozoan Crithidia fasciculata (M. W. Gray, Can. J. Biochem. 57:914-926, 1979). The results suggested that the C. fasciculata ribosome might be unusual in containing three novel, low-molecular-weight ribosomal RNA components, designated e, f, and g (apparent chain lengths 240, 195, and 135 nucleotides, respectively), in addition to analogs of eucaryotic 5S (species h) and 5.8S (species i) ribosomal RNAs. In the present study, all of the presumptive ribosomal RNAs were indeed found to be associated with purified C. fasciculata ribosomes, and their localization was investigated in subunits produced under different conditions of ribosome dissociation. When ribosomes were dissociated in a high-potassium (880 mM K+, 12.5 mM Mg2+) medium, species e to i were all found in the large ribosomal subunit, which also contained an additional, transfer RNA-sized component (species j). However, when subunits were prepared in a low-magnesium (60 mM K+, 0.1 mM Mg2+) medium, two of the novel species (e and g) did not remain with the large subunit, but were released, apparently as free RNAs. Control experiments have eliminated the possibility that the small RNAs are generated by quantitative and highly specific (albeit artifactual) ribonuclease cleavage of large ribosomal RNAs during isolation. In terms of RNA composition and dissociation properties, therefore, the ribosome of C. fasciculata is the most "atypical" eucaryotic ribosome yet described. These observations raise interesting questions about the function and evolutionary origin of C. fasciculata ribosomes and about the organization and expression of ribosomal RNA genes in this organism.

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