Regrowth dynamics of <Emphasis Type="Italic">Calamagrostis epigejos</Emphasis> after defoliation as affected by nitrogen availability |
| |
Authors: | V Gloser M Košvancová J Gloser |
| |
Institution: | (1) Department of Plant Physiology and Anatomy, Faculty of Science, Masaryk University, Kotlářská 2, CZ-61137 Brno, Czech Republic |
| |
Abstract: | Young plants of a rhizomatous grass Calamagrostis epigejos (L.) Roth were grown from seed in nutrient solutions containing nitrogen in concentrations 0.1, 1.0, and 10 mM. After six
weeks of cultivation the plants were defoliated and changes in growth parameters and in content of storage compounds were
measured in the course of regrowth under highly reduced nitrogen availability. Plants grown at higher nitrogen supply before
defoliation had higher amount of all types of nitrogen storage compounds (nitrates, free amino acids, soluble proteins), which
was beneficial for their regrowth rate, in spite of lower content of storage saccharides. Amino acids and soluble proteins
from roots and stubble bases were the most important sources of storage compounds for regrowth of the shoot. Faster growth
of plants with higher N content was mediated by greater leaf area expansion and greater number of leaves. In plants with lower
contents of N compounds number of green leaves decreased after defoliation significantly and senescing leaves presumably served
as N source for other growing organs. Results suggest that internal N reserves can support regrowth of plants after defoliation
even under fluctuating external N availability. Faster regrowth of C. epigejos with more reserves was mediated mainly by changes in plant morphogenesis. |
| |
Keywords: | amino acids nitrates nitrogen storage compounds non-structural saccharides soluble proteins |
本文献已被 SpringerLink 等数据库收录! |
|