PHYSIOLOGICAL ADAPTATION MECHANISMS OF CONIFEROUS PLANTS TO DROUGHT

Original title

ФИЗИОЛОГИЧЕСКИЕ МЕХАНИЗМЫ АДАПТАЦИИ ХВОЙНЫХ К ЗАСУХЕ

Authors

Vl.V. Kuznetsov¹, I.E. Zlobin¹, A.V. Kartashov¹, B.A. Sarvin², A.R. Stavrinidi², P.P. Pashkovsky¹, Yu.V. Ivanov¹

Contact information

¹Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia, Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.

²Moscow State University, Moscow, Russia, Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.

Pages

17-20

DOI

10.31255/978-5-94797-319-8-17-20

Abstract

A comparative analysis of the ability of pine and spruce seedlings to maintain water status under conditions of weak, medium and extremely low water potential of the medium (from -0.15 to -1.5 MPa) is presented. It is concluded that seedlings of both species retained a high intensity of assimilation processes under water stress. Norway spruce seedlings maintained a water balance under drought and showed high sensitivity to water deficiency, which is based on their weak ability to cell wall adjustment. Scots pine seedlings showed a high sensitivity of the growth of the main root to the water deficit, which may be one of the reasons for their death during a drought. At the same time, pine seedlings had a well-developed ability of cells to osmotic adjustment. In favor of this is the fact that in response to water deficiency in pine seedlings, but did not spruce, an increase in the content of unstructured carbohydrates (sugar, sugar alcohol, starch) was observed. Despite the relatively low content of sugars and sugar alcohols in the organs of the seedlings, their contribution to the change in the osmotic potential of the cytoplasm was very significant.