scholarly journals Genome size stability despite high chromosome number variation in Carex gr. laevigata

2015 ◽  
Vol 102 (2) ◽  
pp. 233-238 ◽  
Author(s):  
Marcial Escudero ◽  
Enrique Maguilla ◽  
João Loureiro ◽  
Mariana Castro ◽  
Sílvia Castro ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Genome Size ◽  
High Chromosome Number ◽  
Size Stability ◽  
Number Variation ◽  
Chromosome Number Variation

scholarly journals Euploid Endosperm of Triploid × Diploid/tetraploid Crosses Results in Aneuploid Embryo Survival in Lilium

HortScience ◽  
2011 ◽  
Vol 46 (4) ◽  
pp. 558-562 ◽  
Author(s):  
Shujun Zhou ◽  
Guixue Zhou ◽  
Kehu Li
Keyword(s):  
Tissue Culture ◽  
Chromosome Number ◽  
Chromosome Preparation ◽  
Male Sterile ◽  
Potential Significance ◽  
Good Source ◽  
Embryo Survival ◽  
Number Variation ◽  
Chromosome Number Variation

The main objective of the present study was to identify chromosome number variation in the progenies from triploid × diploid/tetraploid (3x × 2x/4x) crosses in Lilium to analyze the survival of aneuploid embryos from 3x × 2x/4x crosses and the potential significance of triploid for lily breeding. Two male-sterile autotriploid Asiatic lily cultivars were crossed with four diploid and/or two autotetraploid Asiatic cultivars. The results showed that the fruits of all triploid × diploid/tetraploid (3x × 2x/4x) crosses fully developed, and seedlings were obtained from the 3x × 2x/4x crosses, indicating that male-sterile autotriploid lilies can be used as female parents. Chromosome preparation showed that the progenies of the 3x × 2x/4x are predominantly aneuploid. Based on megasporogenesis, we deduce that the endosperm of 3x × 2x is 7x and that of 3x × 4x is 8x in Lilium and conclude that the aneuploid embryo survival of 3x × 2x/4x in Lilium is the result of the euploid endosperm. Lily is usually propagated by scaling or tissue culture; therefore, aneuploids obtained from triploid × diploid/tetraploid lilies would be a good source for cultivar breeding.

INVESTIGATIONS ON THE SPORTING PROCESS IN GREENHOUSE CHRYSANTHEMUMS

1958 ◽  
Vol 38 (3) ◽  
pp. 346-356 ◽  
Author(s):  
D. R. Sampson ◽  
G. W. R. Walker ◽  
A. W. S. Hunter ◽  
Marie Bragdø
Keyword(s):  
Water Treatment ◽  
Chromosome Number ◽  
Chromosome Numbers ◽  
Flower Colour ◽  
Hot Water ◽  
Hot Water Treatment ◽  
Colour Mutation ◽  
Number Variation ◽  
Chromosome Number Variation

The chromosome numbers of 56 varieties of greenhouse chrysanthemums were determined. Fifty-one varieties belonged to 10 'families' of sports and the chromosome numbers of the sports were compared with those of their vegetative parents. Sporting, mostly flower colour mutation, was accompanied by the gain or loss of a few chromosomes in about 30 per cent of the cases. Two plants with different chromosome numbers but with the true varietal flower colour were found.The most frequent chromosome number in the authors' material was 2n = 57. The range was 2n = 45–64. Mitotic irregularities and chromosome number variation within individuals were observed. Attempts to induce sporting by hot water treatment failed.Varieties with large inflorescences had higher chromosome numbers (2n = 58–64) than varieties with medium or small inflorescences (2n = 54–58), but in most of the material varieties with small inflorescences differed little in chromosome number from those with medium-sized inflorescences. Five additional varieties with very small inflorescences had lower chromosome numbers (2n = 45–55).

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