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Intraspecific variation in the ultraviolet colour proportion of flowers in Brassica rapa L. (2005)

Yoshioka, Y. ; Horisaki, A. ; Kobayashi, K. ; [et al.]

Berlin, Germany : Blackwell Verlag GmbH

Plant breeding 124 (2005), S. 0

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ISSN: 1439-0523

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: In Brassica rapa L., intraspecific variation in the ultraviolet (UV) colour proportion invisible to humans but visible to insect pollinators, was investigated by UV-photographing. After digitization of each photograph, the UV-absorbing area (UVA) and total flower area (FA) were evaluated by means of image analysis. The ratio of UVA to FA represented the UV colour proportion (UVP). Nested anova indicated that the proportion of the variance caused by the genotypic effect was largest for UVP, and anova indicated that the F-value for UVP was larger than that for FA. These results indicate that UVP is very stable within a genotype. That is, there was almost no additional variation caused by plants and branches. In contrast, UVP varies widely between genotypes with respect to FA. The large differences in the UVP of B. rapa flowers are likely to be distinguishable by insect pollinators, which might use these differences as visual cues in their foraging flight.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1439-0523.2005.01132.x

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Restriction fragments homologous to mitochondrial plasmid-like DNAs are located within limited chromosomal regions on the rice nuclear genome (1993)

Kanazawa, A. ; Kishimoto, N. ; Sakamoto, W. ; [et al.]

Springer

Theoretical and applied genetics 87 (1993), S. 577-586

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ISSN: 1432-2242

Keywords: Mitochondrial DNA ; Plasmid-like DNA ; Nuclear homologue ; Inter-organellar sequence transfer ; Rice

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The chromosomal locations of restriction fragments of nuclear DNA that were homologous to four mitochondrial plasmid-like DNAs, namely, B1, B2, B3 and B4, were analyzed by restriction fragment length polymorphism (RFLP) analysis in cultivated rice. Nine kinds of fragments homologous to plasmidlike DNAs were analyzed for their segregation in three different F2 populations derived from intercrosses between rice subspecies; these were found to be localized in three chromosomal regions: three, one and five kinds of nuclear homologues were situated on chromosomes 1,3 and 8, respectively. Nuclear homologues on a given chromosome were tightly linked even though they were homologous to different plasmid-like DNAs. The loci of nuclear homologues found commonly in two or three cultivars were found to be highly conserved, a result that is consistent with their stable transmission. These results and those of the Southern analysis suggest the independent integration of these sequences during the varietal differentiation of rice. The concentration of loci for nuclear homologues on chromosomes 1 and 8 suggests that these sequences were integrated non-randomly into these chromosomal regions.