Vyal Yulia Alexandrovna, Candidate of biological sciences, associate professor, sub-department of botany, plant physiology and biochemistry, Penza State University (40 Krasnaya street, Penza, Russia), firstname.lastname@example.org
Mazei Natalya Grigorievna, Candidate of biological sciences, associate professor, sub-department of botany, plant physiology and biochemistry, Penza State University (40 Krasnaya street, Penza, Russia), email@example.com
Background. The aim of the study is to investigate the process of formation of the anatomical and morphological structure in ontogenesis of Iris domestica Goldblatt et Mabb introduced in the Penza Botanical Garden.
Materials and methods. The studies were conducted on the basis of the Penza Botanical Garden named after I. I. Sprygin. Iris domestica seeds were obtained in 2009 from the Saratov Botanical Garden. A total of 40 plants of different age were analysed. The study of ontogeny and description of age stages was performed on the basis of the method developed by T. A. Rabotnov (1947, 1950) and supplemented by A. A. Uranov (1975). The sections of stems, rhizomes, roots, leaves were handprepared using elderberry core.
Results. The following age stages of Iris domestica were distinguished within the populations introduced at the Penza Botanical Garden: 1) the latency; 2) the pregenerative (juvenile, immature, vegetative); 3) the generative periods. Each stage of ontogeny was characterized by certain features of the internal structure of vegetative organs that reflect the complexity level of the organization in the transition to a new age status and adaptation to environmental conditions.
Conclusions. Iris domestica being a typical multiannual rhizome plant behaves as a 2–3-annual plant in the Penza region. More rapid passage of the life cycle in the environmental conditions, highly differing from the ecological optimum, is one of the adaptive reactions of the species at the level of individual ontogenesis, caused by the growing season reduction.
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