Comparison of Aerial and Submerged Leaves in Two Amphibious Species,Myosotis scorpioides and Ranunculus trichophyllus |
| |
Authors: | Germ M Gaber??ik A |
| |
Institution: | (1) National Institute of Biology, Ve na pot 111, Ljubljana, Slovenia;(2) Department of Biology, Biotechnical Faculty, Ve na pot 111, Ljubljana, Slovenia |
| |
Abstract: | Both amphibious species, Myosotis scorpioides and Ranunculus trichophyllus, thrive in a stressful environment (alternated flooding and drying), which is variable regarding water and radiation regimes. Plants from the field and plants grown under controlled water table maintained at 40 cm were analysed for content of chlorophyll (Chl) and UV-B screening compounds, and the efficiencies of PS2 and electron transport systems. We detected no significant differences in contents of Chl and UV-B screening compounds between submerged and aerial leaves. The measurements of respiratory potential and photochemical efficiency revealed the presence of permanent stress in M. sporpioides in the natural environment. Differences in physiological responses of submerged and aerial leaves indicated that the terrestrial environment was more favourable for M. scorpioides than for R. trichophyllus. Characteristics of both species suggested that R. trichophyllus might be a phylogenetically older aquatic plant than M. scorpioides. |
| |
Keywords: | chlorophylls electron transport system activity fluctuating water level fluorescence induction leaf length photochemical efficiency of photosystem 2 stomata number UV-B screening compounds |
本文献已被 SpringerLink 等数据库收录! |
|