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  • 1985-1989  (2)
  • Gene analysis  (1)
  • High amylose mutant  (1)
  • 1
    Electronic Resource
    Electronic Resource
    High amylose mutants of rice,Oryza sativa L. (1985)
    Springer
    Theoretical and applied genetics 69 (1985), S. 253-257 
    Details
    ISSN: 1432-2242
    Keywords: Oryza sativa L. ; Endosperm ; High amylose mutant ; Starch properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Five mutant lines of rice with increased amylose content in starch granules were identified among floury endosperm mutants. The amylose contents of the mutants ranged from 29.4% to 35.4% and were about twice as high as that of the normal counterpart. Starch properties of the high amylose mutants were analyzed by column chromatography, X-ray diffractometry, photopastegraphy and scanning electron microscopy. The high amylose mutants produced longer unit chains of amylopectin than those of the normal counterpart as well as an increased amount of amylose. A X-ray diffractogram of starch in the mutant was characterized by a type B pattern, while that in the normal counterpart showed a type A pattern which is typical for starches of common cereals. The temperatures at the initiation of gelatinization of the mutants were much higher than that for the normal counterpart. The endosperm cells of the mutant were loosely packed with irregular round-shaped starch granules, whereas those of the normal counterpart were densely packed with polyhedral starch granules. Judging from the results obtained, it was concluded that starch properties of the high amylose mutants of rice were similar to those of the amylose-extender (ae) mutant of maize.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662436
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chromosomal location of genes conditioning low amylose content of endosperm starches in rice, Oryza sativa L. (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 183-189 
    Details
    ISSN: 1432-2242
    Keywords: Gene analysis ; Endosperm mutants ; Low amylose content ; Dosage effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Eight dull mutants that lower the amylose content of rice endosperm as well as waxy mutant and a cultivar with common grains were crossed in a diallele manner. The amylose content of F1 and F2 seeds was determined on the basis of single grain analysis. It was concluded that the low amylose content of dull mutants is under monogenic recessive control. Alleles for low amylose content are located at five loci designated as du-1, du-2, du-3, du-4 and du-5. These loci are independent of wx locus located on chromosome 6. The five du loci have an additive effect in lowering the amylose content. Two loci, du-1 and du-4, were found to be located on chromosomes 7 and 4, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257844
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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