. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN 306, U. S. DEPABTMENT OF AGBICTJLTUBE. From Tables IV and V it becomes apparent that during both the first and second seasons these first-generation plants display very markedly the characteristic of the parents as regards alkaloid pro- duction. Thus, in 1913 the average percentage of alkaloids found in the plants from the original parent 6w and the parent 7w, which were selected for high alkaloid-producing tendencies, was arid I 23 C» 46(6) 7MU 7W(oj 6W(6) 6W(a) Fig. 5.—Diagram showing the alkaloidal
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN 306, U. S. DEPABTMENT OF AGBICTJLTUBE. From Tables IV and V it becomes apparent that during both the first and second seasons these first-generation plants display very markedly the characteristic of the parents as regards alkaloid pro- duction. Thus, in 1913 the average percentage of alkaloids found in the plants from the original parent 6w and the parent 7w, which were selected for high alkaloid-producing tendencies, was arid I 23 C» 46(6) 7MU 7W(oj 6W(6) 6W(a) Fig. 5.—Diagram showing the alkaloidal content of the leaves of first-generation belladonna plants from close-pollinated and cross-pollinated selected parents at two stages of growth during the first season, 1913. The percentages indicated represent the average of all the individuals from each parent plant: a, Plants from close-pollinated parents; 6, plants from cross-pollinated parents. per cent, respectively. On the other hand, the averages from the plants 23 and 46, which were produced from parents of the opposite tendencies, are and per cent, respectively. Again the following year we find the average of plants 6w and 7w to be and per cent, respectively. Lot 46 was not picked that year, but lot 23 averaged per cent. If will be seen from the tables that the effect of close pollination as compared with cross-pollination is not as great as would be expected. In the case of 6w the plants from close pollina- tion are on the average per cent richer than those from cross-pollination in 1913, and per cent richer in 1914. The 7w plants show a difference of per cent in favor of cross-pollination in 1913 and a difference of per cent in 1914. Figures 5 to 8 graphi- cally illustrate these conditions. Sufficient information has not been obtained to indicate with any degree of certainty the influence of cross-pollination and close pollination on the tramsmissibilit
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