Phytochemical analysis of the vegetative organs of hybridogenous complex Reynoutria Houtt.

A.G. Kuklina, N.S. Tsybulko
A phytochemical study was conducted of two species from the family Polygonaceae: Reynoutria sachalinensis (F. Schmidt) Nakai and R. × bohemica Chrtek & Chrtková (= R. japonica Houtt. × R. sachalinensis) which exhibit a high degree of invasiveness and are wide spread in Europe. Seven geographical populations in the Moscow region (Russia) were examined. For the first time, the contents of biologically active substances were studied including flavonoids (vitamin P), ascorbic acid (vitamin C) and organic acids in the growth cones (apical part of the shoots) and leaves in early and mid-summer of R. × bohemica. We have established that the content of biologically active substances in the vegetative organs of two closely related Reynoutria Houtt. taxa practically has no difference. It was also established that at the beginning of vegetation the growth cones contains the maximum amount of organic acids in R. sachalinensis (9.8%), in R. × bohemica (9.1-12.4%); flavonoids and ascorbic acid were present in R. sachalinensis at 1 and 0.04%, in R. × bohemica at 1.2 and 0.03%, respectively. During the vegetation period (end of July), the content of vitamin C in leaves increased significantly in both taxa up to 37-46% and to a lesser extent flavonoids accumulated up to 2.7%. The content of organic acids during the vegetation of Reynoutria, on the contrary, gradually decreased. It is known that the young shoots of R. sachalinensis are edible, in a processed form. They taste like asparagus and it can be assumed that shoots of the type R. × bohemica which is wide spreading in Europe can be used in the same manner. When using young leaves and the growing cone of R. × bohemica and R. sachalinensis in the spring period, the consumer's diet is enriched with useful vitamins P and C, as well as organic acids. The best time for collecting of plant materials of R. × bohemica and R. sachalinensis in order to obtain the highest accumulation of bioflavonoids is July-August, during the vegetative phase of plants.
Kuklina, A.G. and Tsybulko, N.S. (2021). Phytochemical analysis of the vegetative organs of hybridogenous complex Reynoutria Houtt.. Acta Hortic. 1324, 381-388
DOI: 10.17660/ActaHortic.2021.1324.59
Reynoutria, leaf, growth cones, flavonoids, ascorbic acid, organic acids

Acta Horticulturae