Affiliation:
1. Technology Center, China Tobacco Zhejiang Industrial Corporation, Hangzhou, China
2. Zhengzhou Tobacco Research
Institute of CNTC, Zhengzhou, China
Abstract
Background:
The regulatory effects of carbon nanomaterials (CNMs) on plant growth and
their potential applications in agriculture have attracted a great deal of attention from researchers.
CNMs have been shown to promote nutrient absorption and increase plant growth. However, the
mechanisms by which CNMs affect plant growth and nutrient absorption are still unknown.
Methods:
The tobacco seedling biomass, potassium (K+) concentration, and accumulation in hydroponic
were investigated to exposure of carbon nanoparticles (CNPs). To directly observe the effect of
CNPs on K+ uptake by roots, we employed a noninvasive micro-test technique (NMT) to detect the
net flux of K+ on the surface of tobacco roots. The K+-depletion experiment was carried out to explore
the kinetic characteristics of K+ absorption, and qRT-PCR was used to monitor the expression levels
of the K+ channel gene.
Results:
The results showed that tobacco seedling biomass significantly improved at 10 mg·L-1 CNP
treatments, and K+ concentration and accumulation both in roots and shoots increased with 10 and 20
mg·L-1 CNPs. CNP treatments changed the flow rate of K+ from efflux to influx in tobacco roots; this
was observed both in plants cultivated in a CNP-containing medium and after the addition of CNPs to
previously untreated plants. A depletion test also showed that CNPs improved the K+ absorption capacity
and low-K+ tolerance of tobacco seedlings.
Conclusion:
CNPs enhanced the K+ absorption capacity and low-K+ tolerance of tobacco seedlings.
The promotion of K+ absorption by CNPs was closely related to the activation of K+ influx channel
genes and inhibition of the K+ outflow channel gene. The K+ flux response and ion channel gene expression
to CNPs in plants reveal the mechanism whereby CNPs promote plant nutrient absorption.
Funder
Zhengzhou Tobacco Research Institute Dean Fund
key project of China National Tobacco Corporation
Publisher
Bentham Science Publishers Ltd.
Subject
Pharmaceutical Science,Biomedical Engineering,Medicine (miscellaneous),Bioengineering,Biotechnology