MYLES, E. L., JR., and ENDRIZZI, J. E. 1989. Aneuploids induced by deficiencies of chromosome 9 and analysis of the time of nondisjunction in cotton. Genome, 32: 12 -18. Plants of allotetraploid cotton, Gossypium hirsutum L. (2n = 4x = 52), which are monosomic for chromosome 9 or haplodeficient for the long arm of the chromosome, an Ah genome chromosome, produce a high frequency of aneuploid progeny. The aneuploids include monosomes, trisomes, and multiple monosomic and trisomic combinations that are the result of chromosome nondisjunction, which is induced by the deficiency of the long arm of chromosome 9. Loss of chromosomes occurs far more frequently than additions, and chromosomes of the Ah genome undergo nondisjunction at a significantly greater rate than do chromosomes of the Dh genome. Stained paraffin sections of ovules at different stages of development of monotelodisomic 9 and normal plants (TM1) were analyzed to determine the time and probable causes of nondisjunction during megasporogenesis. The most significant difference between mono 9 and TM1 was observed in ovules in stages of development just before and at the time of flowering. The mono 9 female gametophytes had supernumerary nuclei, indicating that chromosome nondisjunction occurs at the mitotic divisions of the embryo sac.MYLES, E. L., JR., et ENDRIZZI, J. E. 1989. Aneuploids induced by deficiencies of chromosome 9 and analysis of the time of nondisjunction in cotton. Genome, 32 : 12-18. Les plantes allotktraploi'des du coton, le Gossipium hirsutum L. (2n = 4x = 52), qui sont monosomiques pour le chromosome 9 ou haplodkficientes pour le bras long du chromosome, un chromosome du gknome Ah, produisent une frkquence klevke de descendants aneuploi'des. Ces aneuploi'des incluent, des monosomes, des trisomes et des combinaisons monosomiques et trisomiques qui rksultent d'une non-disjonction induite par la dkficience du bras long du chromosome 9. Les pertes de chromosomes sont beaucoup plus frkquentes que les additions. Les chromosomes du gknome Ah subissent de la nondisjonction a un taux significativement plus klevk que les chromosomes du gknome Dh. Des ovules de plantes monotklodisomiques 9 et de plantes normales (TM1) ont kt6 prklevks a diffkrents stades de dkveloppement, puis aprks emparaffinement, sectionnement et coloration, les coupes ont fait l'objet d'analyses pour dkterminer le temps et les causes probables de la nondisjonction au cours de la mkgasporogenkse. La diffkrence la plus significative entre les mono 9 et les TM1 a kt6 observke chez les ovules aux stades de dkveloppement qui prkckdent immkdiatement la floraison ou au cours de la floraison. Les gamktophytes femelles des mono 9 posskdaient des noyaux surnumkraires, ce qui indique que la non-disjonction survient lors des divisions mitotiques dans le sac embryonnaire.
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