Allelopathic Influence of Betula pendula Leaf Litter on the Initial Stages of Rumex aquaticus L. Ontogenesis
- PDF / 199,071 Bytes
- 4 Pages / 612 x 792 pts (letter) Page_size
- 25 Downloads / 183 Views
ER AQUATIC VEGETATION
Allelopathic Influence of Betula pendula Leaf Litter on the Initial Stages of Rumex aquaticus L. Ontogenesis E. G. Krylovaa, * and E. V. Garina aPapanin
Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Nekouzskii raion, Yaroslavl oblast, Russia *e-mail: [email protected]
Received August 27, 2019; revised December 24, 2019; accepted January 28, 2020
Abstract—The allelopathic effect of extracts from leaf litter of Betula pendula on the initial stages of ontogenesis (seed germination and growth and development of seedlings) of Rumex aquaticus has been studied in laboratory conditions. A significant decrease in laboratory germination by 1.5–36.3 times, depending on the concentration of the extract, is found. The change in the coefficient of inhibition confirmed the phytotoxicity of the investigated extract. The inhibitory effect on the seedlings at a concentration ≥50% of control is manifested in a decrease in the morphometric parameters of both the underground (root system and hypocotyl) and aboveground (cotyledon) parts of the seedlings. Keywords: allelopathic effect, leaf litter, inhibition coefficient, initial stages of ontogenesis, Rumex aquaticus DOI: 10.1134/S1995082920030104
The leaf litter of woody plants plays an important role in the formation of terrestrial and aquatic phytocenoses affecting the seed germination and growth and development of seedlings of their forming species (Konoshina et al., 2014; Anser et al., 2015; Debnath et al., 2017). Allelochemicals (phenols, alkaloids, carbohydrates) are accumulated in leaves, which are the most metabolically active organs (Jabran and Farooq, 2012; Regiosa et al., 2013). Phenolic compounds, which have properties of natural inhibitors, are in the first turn accumulated in aging leaves before leaf fall (Zaprometov, 19993; Konoshina et al., 2014). They may inhibit seed germination and affect some ecological functions associated with the relationship between plants and other organisms (Carvalho et al., 2015; Uddin et al., 2014). There are some publications devoted to this problem, but the studies were mainly performed using plant crops (Callaway and Ridenour, 2004; Wardani et al., 2018). The western dock Rumex aquaticus L. was used as an object of study. It is a perennial hygrohelophyte, widespread in the central part of European Russia; it grows along the banks of water bodies and on swampy meadows. Betula pendula Roth is the most common species along the banks of natural and artificial water bodies in the forest area of the central part of European Russia. The aim of this study is to find out whether the leaf extract of Betula pendula Roth has an allelopathic effect on seed germination and growth and development of Rumex aquaticus seedlings.
Seed germination trials were performed under laboratory conditions. For the experiment, fresh leaf litter of birch were collected; 3 kg of leaves were placed into a 10-L container and mixed with 6 L of pond water for 24 h. Then the extract was filtered and diluted with clean pond
Data Loading...
