Seasonal changes of chemical components in the cones from various clones of Abies sachalinensis in a seed orchard and germination test of the mature seeds
1991
Ujiie, M. (Hokkaido Univ., Sapporo (Japan). Faculty of Agriculture) | Katayose, T. | Kudoh, H.
Cones were collected from eight specimens of Abies sachalinensis including six clones monthly from May to September, and the changes of dry cone weight and various chemical components in the cones were traced using seed and scale separated from cone for the cones collected after July. Variations of mature cones from the 36 trees including eleven clones were also investigated chemically, and the relation between germination rate and each quantity of chemical components per grain of seed was examined. Cone weight increased from about 160 mg in May to 12,300 mg in September on the average. Although the percentages of nitrogen, total minerals, phosphorus, and potassium in the cones fell rapidly in the course of their growth, these substances taken up in the cones increased remarkably. Calcium content was unexpectedly low, compared with that of magnesium. Average germination rate of mature seeds was 29%, and seeds from the same clone showed similar germination rate as well as weight and the proportions of chemical components. The germination rate had a highly positive relation to the weight and the quantities of chemical components per grain of seed except calcium -especially potassium, nitrogen, and minerals - as indicated by the high values of the coefficients of correlation
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