| Authors |
Astashenkov Aleksey Yur'evich, Candidate of biological sciences, senior researcher, Central Siberian Botanical Garden of Siberian Branch of the Russian Academy of Sciences (101 Zolotodolinskaya street, Novosibirsk, Russia), E-mail: astal@bk.ru
Cheremushkina Vera Alekseevna, Doctor of biological sciences, principal researcher, Central Siberian Botanical Garden of Siberian Branch of the Russian Academy of Sciences (101 Zolotodolinskaya street, Novosibirsk, Russia), E-mail: cher.51@mail.ru
Kurochkina Natal'ya Yur'evna, Candidate of biological sciences, junior researcher, Central Siberian Botanical Garden of Siberian Branch of the Russian Academy of Sciences (101 Zolotodolinskaya street, Novosibirsk, Russia), E-mail: polemonium@yandex.ru
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| Abstract |
Background. Study of sustainable existence of high-mountain endemic plant species as elements of natural flora is really important. An analysis of the biomorph and shoot formation pattern of individuals in ontogenesis makes it possible to reveal the mechanisms of plant adaptation to habitat conditions. The aim of the paper is study of biomorphological peculiarities of Nepeta formosa Kudr. in different ecological-coenotic conditions of Central Asia.
Materials and methods. The shoot formation pattern and ontogenesis of N. formosa individuals were studied in different geographical and ecological-coenotic conditions of the Pamir-Alai and Tien Shan. Middle-mountain and high-mountain belts of the Zeravshansky, Vakhshsky. Gissarsky and Fergansky Ranges were examined. To study germination biology, seeds were sown in Petri dishes in various laboratory conditions and outdoors.
Results. In total, germination of N. formosa seeds turned out to be poor and amounted to 7–15 %. The maximum germination was noted in the laboratory conditions without preliminary stratification. In all studied habitats the ontogenesis of N. formosa individuals is incomplete, complicated and includes development of a seed individual (a genet) and vegetatively emerging not rejuvenated partial formations (ramets). A caudex is formed in individuals at the initial stages of ontogenesis and a compound rhizome – in the mature generative state. The formation mechanism of a rhizome and its structure (short or long, hypo- or hypoepigeogenic) differ in various growth conditions.
Conclusions. Low temperatures adversely affect the germinating ability of N. formosa. A hypogeogenic rhizome is formed in individuals on large stone, cobble slopes and under conditions of silting up the substrate from time to time (as a result of opening of an innovation bud), as well as in rich meadow soils and in disturbed communities (as a result of opening of a dormant bud). The rhizome of hypoepigeogenic origin is formed on the stony-pebble substrate on flooded river banks and mobile substrates.
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| References |
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