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Genetics and plastid physiology in pelargonium III. Effect of cultivar and plastids on fertilisation and embryo survival

Heredity, ISSN: 1365-2540, Vol: 25, Issue: 1, Page: 89-103
1970
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  • Citations
    11
    • Citation Indexes
      11
  • Captures
    2

Article Description

1. Clones of Pelargonium zonale cultivars Flower of Spring and Dolly Varden, containing either normal green or mutant white plastids in their germ layers, are selfed and crossed in all sixteen of the possible combinations. 2. Comparison of segregation ratios (table I) for the eight mixed plastid crosses show no significant change between total embryos and healthy threeweek-old embryos. Between three-week-old embryos and germination, there is a highly significant selection against white embryos only for the two G x W crosses with D. Varden as the source of green plastids (table 2). Since white embryos form the smallest class from the outset, the effect of this selection on their segregation ratios is fairly mild. 3. By analysis of variance the effects of the cultivars are distinguished from the effects of the plastids, at fertilisation, and at three stages of embryo development. 4. Variations in the cultivar parentage have no significant effect on mean fertilisation (table 6), or mean survival of three-week-old embryos (table 7). There is evidence for a reduced viability of inbred compared with hybrid seed at maturity and germination (table 11). 5. Variations in the plastid parentage have no significant effect on mean fertilisation (table 6), but an effect on mean survival of three-week-old embryos (table 7) is due to the particularly low viability of white embryos produced by W x W selfs and crosses (table 8).6. The combination, in all G x W and W x G crosses, of no difference in mean fertilisation, no difference in embryo survival between fertilisation and three weeks after, and no change in the proportion of green, variegated and white embryos, demonstrates that there is no preferential elimination of white embryos in the earliest days of development. 7. The absence of early selection against white embryos greatly strengthens the evidence for a predominantly paternal inheritance of plastids in all W x G plastid crosses. Among G x W crosses, plastid inheritance is predominantly maternal when D. Varden is the source of green plastids, but approaches equality with F. of Spring as the source of green plastids. © 1970, The Genetical Society of Great Britain. All rights reserved.

Bibliographic Details

R. A.E. Tilney-Bassett

Springer Science and Business Media LLC

Biochemistry, Genetics and Molecular Biology; Medicine

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