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Changes of alkaloid content in plants of Lupinus albus during their vegetation. III. White bitter lupin- in the earliest and the late ontogenetic stages



Changes of alkaloid content in plants of Lupinus albus during their vegetation. III. White bitter lupin- in the earliest and the late ontogenetic stages



Acta Soc Bot Poloniae 31(2): 337-356



Several experiments were carried out in order to investigate: (1) changes[long dash]mainly quantitative[long dash]of alkaloids in plants of bitter white lupin beginning from flowering till maturity, (2) qualitative and quantitative changes of alkaloids in the earliest ontogenetic stages of these plants. Among the facts noted the following are worth emphasizing: The character of alkaloid accumulation in plants grown in field conditions is similar to the character observed earlier with this variety in pot cultures. The greatest increment of these compounds occurs during a relatively short period following the deflorence of lateral shoots. The total alkaloid content does not increase during the subsequent development stages. At the end of vegetation only a very small amount of these bases can be found in the vegetative plant parts. During the period of the greatest alkaloid accumulation a marked increase of the fraction with Rf similar to the Rf of oxylupanine is found in pods of the main shoots. However the content of this fraction decreases in the subsequent period. The amount of hydroxylupanine fraction in pods (of the main as well as of the lateral shoots) increases constantly in the course of their maturation. In contrast with lupanine, its share in the total alkaloids content in seeds[long dash]at that time[long dash]is smaller than in the hulls. The total alkaloid content in dormant seeds does not undergo any significant changes during 2 years storage. However some changes in the quantity of particular alkaloid fractions[long dash]after 5[long dash]6 months of storage[long dash]was noticed. This fact needs further examination. Investigations on alkaloid content in seeds during their imbibition and sprouting gave divergent results. In 1 experiment a marked decrease of alkaloids was found, in 2 others[long dash]this decrease was not noticed. The total alkaloid content in plants was not increasing during 9 days of growth after sprouting.

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