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Nuclear and cytoplasmic gene control of resistance to loose smut (Ustilago tritici (Pers.) Rostr.) in wheat (Triticum aestivum L.) (1989)

Dhitaphichit, P. ; Jones, P. ; Keane, E. M.

Springer

Theoretical and applied genetics 78 (1989), S. 897-903

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ISSN: 1432-2242

Keywords: Triticum ; Ustilago tritici ; Chromosome substitution lines ; Nuclear-cytoplasmic interactions ; Disease resistance

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Using disomic chromosome substitution lines based on the susceptible wheat cultivar ‘Chinese Spring’, loose smut resistance of wheat cultivars ‘Hope’ and ‘Thatcher’ was shown to be conferred in each case by a single dominant major gene carried on chromosome 7 A (‘Hope’) or 7 B (‘Thatcher’). Partial resistance was determined by genes on an additional eight ‘Hope’ or seven ‘Thatcher’ chromosomes, and similarities were evident between the partial resistance genotypes of‘Hope’ and ‘Thatcher’. ‘Chinese Spring’ exhibited a mean infection value of approximately 50%, indicating a significant level of partial resistance, which was found to be due, in part, to genes on the homoeologous chromosome arms 1 As, 1 Es and 1 Ds, and to cytoplasmic genes. Substitution of the ‘Chinese Spring’ nucleus into the cytoplasm of Aegilops squarrosa, Ae. variabilis or Ae. mutica resulted in increased susceptibility to Ustilago tritici. Several alloplasmic lines of the resistant wheat cultivars ‘Selkirk’ and ‘Chris’ exhibited race-specific susceptibility to U. tritici.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00266678

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Raman and IR spectra of matrix isolated OsO3F2 AND OsO4: The molecular shape of monomeric OsO3F2 (1976)

Beattle, I. R. ; Blayden, H. E. ; Crocombe, R. A. ; [et al.]

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 4 (1976), S. 313-322

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ISSN: 0377-0486

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: This paper reports fundamental vibration frequencies for molecular OsO3F2 and OsO4 isolated in argon matrices at low temperatures. OsO3F2 is shown to have D3h symmetry on the basis of Raman and IR selection rules, and this conclusion is confirmed by the results of 18O enrichment studies which demonstrate the presence of an OsO3 unit containing three equivalent oxygens. The argon matrix frequencies are 946.5 (A′1), 928.5 (E′), 646 (A′2), 619 (A′/1) 348 (E″), 316.5 (E′) 258 (A″2) and 206 (E′) cm-1. High resolution spectra are also reported for matrix isolated Os16O4 (ν1 963, ν2 332, ν3 956, and ν4 327 cm-1) and for 18O enriched OsO4 species.

Additional Material: 2 Ill.