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- W4230758508 abstract "It was reported in a previous paper (Kodama1)) that the meristematic cells of root nodules of Astragalus sinicus were tetraploid (2n=32), the usual number of this species being 2n=16.In the present paper the origin of these tetraploid nodule cells was studied. It was found that the root nodules of this species originated in the cortex. An estimation of the degree of ploidy was made by counting the number of chromocenters in interphase nuclei, as there were almost no dividing cells to be seen in the uninfected cortex at the level of nodule formation. In uninfected cortical cells only nuclei having the diploid number of chromocenters (9-18) were observed. After penetration by the infection threads of the nodule bacteria, however, cells with an increased number of chromocenters (11-32) could be seen in the areas immediately surrounding the infection threads. It is thought that the chromosome doubling in these root nodule cells occurred at interphase through endomitosis." @default.
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- W4230758508 date "1968-01-01" @default.
- W4230758508 modified "2023-09-23" @default.
- W4230758508 title "Cytological Studies on Root Nodules of Some Species in Leguminosae III" @default.
- W4230758508 doi "https://doi.org/10.15281/jplantres1887.81.459" @default.
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