Summary
Plants regenerated on two different media (NK and I) from the calluses of simple or cloned subcultures, which were originated from a single stock callus of Haworthia setata derived from its flower bud, were observed for eight characters, i.e., somatic chromosome number in root tips, growth vigor, leaf shape, leaf color, number of stomata per unit leaf area, esterase zymogram, chromosome association at meiotic metaphase I in pollen mother cells, and pollen fertility. From these regenerates plants with different characters from those of the parental plant were obtained. With regards to chromosomal aberrations, tetraploids, aneuploids, plants with a part of the chromosome segment deleted, with reciprocal and non-reciprocal translocations, or with paracentric inversions and those showing sub-chromatid aberrations at meiosis were obtained. The NK medium tended to regenerate more tetraploids and less plants carrying translocation than the I medium.
Chromosome variabilities in somatic cells of the regenerates correlated with those of the calluses, from which they regenerated, while they did not correlate with either the meiotic irregularities (chromosome association at MI) or pollen fertility of the regenerates. From these facts, it was concluded that a rather large number of callus cells participate in the regeneration of an individual plant, although, however, only a few limited types of the cells form its germ line.
Polyploidy affected growth vigor, leaf shape, stomata number and chromosome association at MI, but its effects were not detected on other characters. Chromosomal aberrations at the diploid level produced no clear changes in the regenerate's phenotype except in meiotic chromosome configuration and pollen fertility.
Most chromosomal variants obtained in the present study are already reported in plants collected from wild populations, but plants with the deletion of a whole chromosome (karyotype 7L+6S) or chromosome segment (7L+1M+6S and 14L+2M+12S) have never been reported: this fact suggests that tissue culture is a powerful tool for producing plants with novel karyotypes.
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Communicated by R. Riley
Contribution from the Laboratory of Genetics, Faculty of Agriculture, Kyoto University, Japan, No. 436
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Ogihara, Y. Tissue culture in Haworthia . Theoret. Appl. Genetics 60, 353–363 (1981). https://doi.org/10.1007/BF00264330
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DOI: https://doi.org/10.1007/BF00264330