Open AccessFeatures of seasonal rhythms of growth and development of species of the genus Rebutia K. Schum. (Cactaceae Juss. family) in a greenhouse
Author(s) -
Е. С. Чичканова
Publication year - 2020
Publication title -
sbornik naučnyh trudov
Language(s) - English
Resource type - Journals
ISSN - 0201-7997
DOI - 10.36305/2712-7788-2020-3-156-44-54
Subject(s) - genus , botany , biology , vegetation (pathology) , phenology , microclimate , ecology , medicine , pathology
The article presents the results of studying the growth and development of 17 representatives of the genus Rebutia K. Schum. of Cactaceae Juss. Family (R. albipilosa F. Ritter., R. arenaceae (Cardenas) F. Ritter, R. cajasensis F. Ritter, R. donaldiana A.B. Lau & G.D. Rowley, R. flavistyla F. Ritter, R fiebrigii (Gurke) Britton & Rose ex L.H. Bailey, R. fulviseta Rausch, R. krainziana Kesselring, R. knizei (Rausch) Sida, R. kieslingii Rausch, R. marsoneri Werdermann, R. minuscula K. Schum., R. neocumingii (Backeb.) D.R. Hunt, R. pygmaea var. pectinata (Backeb.) Sida, R. senilis Backeb., R. tiraquensis Cardenas, R. xanthocarpa Backeb.) in the conditions of the Nikitsky Botanical Gardens’ greenhouse, and the influence of the microclimate on the seasonal rhythms of plant growth and development is evaluated. It is established that the studied representatives of the genus Rebutia go through all phases of seasonal development. The key values of the biological minimum of air temperatures for early - (+7,0–+8,0 °C), average (+13,0–+15,0 °C) and for late-growing (+20,0–+25,0 °C) of the species required for the onset of vegetation. The amounts of active air temperatures accumulated by the beginning of the phases of "vegetation" (from 335,2 to 1593,5 °C), "budding" (from 558,3 to 2285,0 °C), "flowering" (from 1067,8 to 2271,8 °C), "fruiting" (from 2374,8 to 3099,0 °C) are established. The following features of plant growth and development are revealed: for the transition of Rebutia species from the phenological phase "vegetation" occurring in the spring-summer period, to a state of physiological rest, which continues in the autumn-winter period, it is necessary to reduce the air temperature from +17,0–+28,0 °C to +6,0–+13,0 °C; humidity from 35,0-90,0 % to 32,0-65,0 %. Taking these measures will ensure a long and abundant flowering of Rebutia species at an air temperature from +15,0 to +40,0 °C, humidity from 43,0 to 95,0 % in a greenhouse.