The effect of colchicine treatment on Solanum acaule and S. bulbocastanum; A complete analysis of ploidy chimeras in S. bulbocastanum View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1971-05

AUTHORS

J. G. Th. Hermsen, A. J. E. De Boer

ABSTRACT

Seeds of tetraploid Solanum acaule (2n=48) and diploid S. bulbocastanum (2n=24) were germinated in petri-dishes on filter paper soaked in 0.3% colchicine. An additional treatment with 0.3% colchicine was applied one month after sowing at four successive days in the axils of the cotyledons of the seedlings. S. acaule appeared much more sensitive to colchicine (14 surviving seedlings from 500 seeds) than S. bulbocastanum (109 surviving seedlings from 450 seeds). Six S. acaule plants with 2n=96 chromosomes were obtained against 38 S. bulbocastanum plants with 2n=48 chromosomes. The ploidy level in each of the three germ layers L1, L2, L3 was determined in 113 plants of S. bulbocastanum and the following results were obtained. Four of the eight possible ‘ploidy types’ were detected, viz 2x-2x-2x (72 plants), 4x-2x-2x (3 plants), 2x-4x-4x (9 plants) and 4x-4x-4x (29 plants). Doubling the number of chromosomes resulted in a highly significant increase of the number of chloroplasts in the guard cells of stomata and a greatly significant decrease in the proportion of trimerous pollen, male fertility and leaf index. The variability for all characters studied, except for leaf index, was clearly lowest in the 2x-2x-2x group. All plants with a 2x-L2 were highly male fertile and self-incompatible, also in the three bud stages tested. Male fertility of the plants with 4x-L2 varied greatly: 12 plants had more than 90% stainability, 5 plants must be considered male sterile. All non-sterile plants with 4x-L2 were found to be self-compatible, pointing to a gametophytic system of incompatibility in S. bulbocastanum. More... »

PAGES

171-180

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00056077

DOI

http://dx.doi.org/10.1007/bf00056077

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021921228


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