Further comparisons of plants with different chromosome numbers in respect to chemical composition
1944
Sullivan, J.T.
Comparative chemical analyses were made of diploid and tetraploid perennial ryegrass. In field rows, tetraploid plants were lower in percentage dry matter and higher in sucrose and total sugars and in the proportion of dry matter soluble in alcohol. In similar plants grown in culture solutions in the greenhouse similar results were obtained, except that tetraploid plants were lower in percentage dry matter only in respect to younger clippings and were higher in sugars only in more mature clippings. In white clover, octoploid plants were lower in fiber and in carotene than tetraploid plants. Differences in chemical composition which were found associated with an increase in chromosome number, while of statistical significance in those cases stated, were not however of great magnitude. In general, it may be stated that an increase in chromosome number was frequently associated with an increase in moisture and in the soluble constituents and with a decrease in the structural constituents. The reverse association was not found in any case.
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