Cytological Studies on Autotetraploid <i>Brassica chinensis</i> L

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1) For the cytological studies, one of the filial generation plants of colchicine induced tetraploid Brassica chinensis was used. This plant was the true autotetraploid.<br>2) In the diploid of this variety, chromosome behaviour is regular in general.<br>3) At diakinesis of the tetraploid, 1-6 quadrivalents are counted and the mean number of them per PMC is 3.28.<br>4) Trivalents and univalents also appear, and lagging diads at anaphase I are presumably caused by them. Lagging diads take Pilosella type behaviour but many of them fail to be included in the daughter nuclei.<br>5) At metaphase II, 64.37% of plates receive balanced number of chromosomes. The elimination of chromosomes per PMC in the first division was counted to be 0.275. This can be chiefly attributed to the lagging diads being lost in the cytoplasm.<br>6) Pollens of tetraploids are not so bad, but the number of good seeds per pod is much reduced in tetraploids compared with diploids.

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