| Abstract: | Pollens collected from nine grass species were analysed forammonia, urea, glutamine, asparagine, amino-nitrogen, totalsoluble nitrogen, and total nitrogen. Four grass pollens werealso assayed microbiologically for 17 individual amino-acids. Wide variations in composition were found between pollens fromdifferent grasses. Soluble nitrogen was in most cases relativelyhigh in proportion to the total nitrogen. Asparagine occurredin much greater amount than glutamine. Of the free amino-acids,the most abundant was proline, its content in the perennialryegrass pollen reaching 165 per cent, of the dry weight ofthe pollen. |
