Next Article in Journal
Effects of Medium-Term Amendment with Diversely Processed Sewage Sludge on Soil Humification—Mineralization Processes and on Cu, Pb, Ni, and Zn Bioavailability
Previous Article in Journal
Dimensional Changes of Tracheids during Drying of Radiata Pine (Pinus radiata D. Don) Compression Woods: A Study Using Variable-Pressure Scanning Electron Microscopy (VP-SEM)
Open AccessArticle

Relationships between Nutrient Heterogeneity, Root Growth, and Hormones: Evidence for Interspecific Variation

by 1,†, 2 and 1,*
1
State Key Laboratory of Earth Surface Processes and Resource Ecology and Ministry of Education Key Laboratory for Biodiversity Science and Engineering, Beijing Normal University, Beijing 100875, China
2
Department of Forestry and Environmental Conservation, Clemson University, Clemson, SC 29634, USA
*
Author to whom correspondence should be addressed.
Current Address: Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Plants 2018, 7(1), 15; https://doi.org/10.3390/plants7010015
Received: 15 January 2018 / Revised: 13 February 2018 / Accepted: 15 February 2018 / Published: 28 February 2018
(1) Background: Plant roots respond to nutrients through root architecture that is regulated by hormones. Strong inter-specific variation in root architecture has been well documented, but physiological mechanisms that may control the variation have not. (2) Methods: We examined correlations between root architecture and hormones to seek clues on mechanisms behind root foraging behavior. In the green house at Beijing Normal University, hydroponic culture experiments were used to examine the root responses of four species—Callistephus chinensis, Solidago canadensis, Ailanthus altissima, Oryza sativa—to two nitrogen types (NO3 or NH4+), three nitrogen concentrations (low, medium, and high concentrations of 0.2, 1, and 18 mM, respectively) and two ways of nitrogen application (stable vs. variable). The plants were harvested after 36 days to measure root mass, 1st order root length, seminal root length for O. sativa, density of the 1st order laterals, seminal root number for O. sativa, the inter-node length of the 1st order laterals, and root hormone contents of indole-3-acetic acid, abscisic acid, and cytokinins (zeatin + zeatinriboside). (3) Results: Species differed significantly in their root architecture responses to nitrogen treatments. They also differed significantly in hormone responses to the nitrogen treatments. Additionally, the correlations between root architecture and hormone responses were quite variable across the species. Each hormone had highly species-specific relationships with root responses. (4) Conclusions: Our finding implies that a particular root foraging behavior is probably not controlled by the same biochemical pathway in all species. View Full-Text
Keywords: root growth; root hormones; root architecture; nitrogen treatment root growth; root hormones; root architecture; nitrogen treatment
Show Figures

Figure 1

MDPI and ACS Style

Dong, J.; Jones, R.H.; Mou, P. Relationships between Nutrient Heterogeneity, Root Growth, and Hormones: Evidence for Interspecific Variation. Plants 2018, 7, 15. https://doi.org/10.3390/plants7010015

AMA Style

Dong J, Jones RH, Mou P. Relationships between Nutrient Heterogeneity, Root Growth, and Hormones: Evidence for Interspecific Variation. Plants. 2018; 7(1):15. https://doi.org/10.3390/plants7010015

Chicago/Turabian Style

Dong, Jia; Jones, Robert H.; Mou, Pu. 2018. "Relationships between Nutrient Heterogeneity, Root Growth, and Hormones: Evidence for Interspecific Variation" Plants 7, no. 1: 15. https://doi.org/10.3390/plants7010015

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop