Biomorphology and rhythm of seasonal development of the relic species Lobelia dortmanna in oligotrophic lakes of Tver region
| Autor: | A. G. Lapirov, E. A. Belyakov, O. A. Lebedeva |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Regulatory Mechanisms in Biosystems, Vol 8, Iss 3, Pp 349-355 (2017) |
| Druh dokumentu: | article |
| ISSN: | 2519-8521 2520-2588 |
| DOI: | 10.15421/021754 |
| Popis: | This article covers the morphology of the vegetative and generative sphere of a rare relic species, Lobelia dortmanna L. (Lobelioideae). This is the first time that using the modular approach a study has analysed the shoot system of this species and described the structures of all three categories: elementary (EM), universal (UM) and basic (OM). This paper describes the life form and analyses the rhythm of seasonal development of the species in the lakes of Tver oblast, and provides data on the seed productivity. As a life form, L. dortmanna is a herbaceous polycarpic, un clearly polycentric shallow-rooted plant with a fibrous root system and non-specialized morphological disintegration. The sympodially growing shoot-system of the plant is formed by two types of different-aged anisotropic replacement shoots: dicyclic vegetative-generative semirosette and annual vegetative rosette shoots. The indicator of actual seed productivity equals on average up to 1621 ± 451 seeds per single vegetative-generative shoot. The module structure of L. dortmanna is presented by 10 variants of elementary modules. The main modules are formed on the basis of a monocarpic dicyclic anisotropic monopodial shoot with the following morpho-functional zones distinguished: 1) the lower zone of inhibition; 2) the recovery zone; 3) the upper zone of inhibition 4) the latent generative zone; 5) the main inflorescence. The functional role of the first three morpho-functional zones of a monocarpic shoot is performed by a minimum number of variants of elementary modules. In the rhythm of seasonal development, the authors distinguished 7 consecutive stages: 1) the period of relative rest; 2) vegetative phase; 3) the phase of budding; 4) flowering; 5) frui ting; 6) secondary activities. By the character of rhythm of seasonal development, L. dortmanna belongs to the group of evergreen plants with a long growing season and middle-late summer flowering. |
| Databáze: | Directory of Open Access Journals |
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