@Article{phyton.2020.010160,
AUTHOR = {Yanwei Feng, Wen Lei, Rui Gu, Ping Zhao, Shijun Ni, Ningfei Lei},
TITLE = {Differential Effects of Ammonium and Nitrate on Growth Performance of <i>Glechoma longituba</i> under Heterogeneous Cd Stress},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {89},
YEAR = {2020},
NUMBER = {3},
PAGES = {667--679},
URL = {http://www.techscience.com/phyton/v89n3/39419},
ISSN = {1851-5657},
ABSTRACT = {Water, minerals, nutrients, etc., can be shared by physiological integration among inter-connected ramets of clonal plants. Nitrogen plays an important
role in alleviating cadmium (Cd) stress for clonal plants. But how different forms
of nitrogen affect growth performance of clonal plants subjected to heterogeneous
Cd stress still remains poorly understood. A pot experiment was conducted to
investigate the differential effects of ammonium and nitrate on growth performance of Glechoma longituba under heterogeneous Cd stress. In the experiment,
parent ramets of <i>Glechoma longituba</i> clonal fragments were respectively supplied
with modified Hoagland solution containing 7.5 mM ammonium, 7.5 mM nitrate
or the same volume of nutrient solution without nitrogen. Cd solution with different concentrations (0, 0.1 or 2.0 mM) was applied to offspring ramets of the clonal fragments. Compared with control (N-free), nitrogen addition to parent
ramets, especially ammonium, significantly improved antioxidant capacity [glutathione (GSH), proline (Pro), peroxidase (POD,) superoxide dismutase (SOD)
and catalase (CAT)], PSII activity [maximum quantum yield of PSII (<i>F<sub>v</sub>/F<sub>m</sub></i>)
and effective quantum yield of PSII (ΦPSII)], chlorophyll content and biomass
accumulation of the offspring ramets suffering from Cd stress. In addition, negative effects of nitrate on growth performance of whole clonal fragments were
observed under Cd stress with high concentration (2.0 mM). Transportation or
sharing of nitrogen, especially ammonium, can improve growth performance of
clonal plants under heterogeneous Cd stress. The experiment provides insight
into transmission mechanism of nitrogen among ramets of clonal plants suffering
from heterogeneous nutrient supply. Physiological integration might be
an important ecological strategy for clonal plants adapting to heterogeneous
environment stress conditions.},
DOI = {10.32604/phyton.2020.010160}
}