The Ecology of Fine Roots across Forest Biomes

A special issue of Forests (ISSN 1999-4907). This special issue belongs to the section "Forest Ecophysiology and Biology".

Deadline for manuscript submissions: closed (12 June 2022) | Viewed by 3983

Special Issue Editors


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Guest Editor
Department of Biotechnologies and Life Sciences (DBSV), University of Insubria, 21100 Varese, Italy
Interests: root anatomy; root architecture; tree stability; ecophysiology; drought
Special Issues, Collections and Topics in MDPI journals

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Co-Guest Editor
Dipartimento Agraria, Università degli Studi di Reggio Calabria, Reggio Calabria, Italy
Interests: root biology mainly focused on the relationships between root form and function (nutrient acquisition and metabolism, exudation process, microbial interaction); plant adaptation in abiotic-stressed environments (nutrient deficiency, drought and heat stress, in single and combined form); root morpho-physiological and molecular mechanisms in response to allelochemicals, biowaste and biostimulants application
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Fine root–soil interactions fundamentally affect the terrestrial carbon (C) cycle and, thereby, ecosystem feedbacks to climate change. Fine roots act as conduits of carbon transfer, from plants to soils, and as agents of nutrient acquisition and transport. In parallel, they are a source of secondary metabolites, i.e., the drivers of rhizosphere development and of the root-facilitated C-cycling in forest soils.

Beyond that, growth, death, and decomposition of fine roots are key processes that occur continuously and simultaneously throughout the whole year, and stocks of living (biomass) and dead fine roots (necromass) represent the end-products of these processes. Thus, modeling responses of forest ecosystems to global changes can benefit greatly from a better characterization of the fine rootstock patterns and dynamics and, consequently, of the carbon transfer into the soil in different forest biomes across the world. Therefore, this Special Issue aims to unveil the interplay between what is beyond (growth, death, and decomposition) and outside (rhizosphere) the root boundary, with special attention to species belonging to different forest biomes to better depict the fine root-derived carbon contribution to C-cycling at biome, hemisphere, and globe scales.

For this Special Issue, we welcome manuscripts that provide novel insights on a broad range of topics on fine roots, including: a) fine root dynamics and seasonal pattern, with a particular focus on the role of starch reserve; b) methods that help to improve the estimation of carbon input into the soil from exudation and decomposition processes; c) plant–plant and plant–microbe interactions, microbial community assemblage and functioning processes, as well as the responses to the environmental stresses, with a particular focus on climate change drivers. Original works, reviews and short communications are all very welcome.

Keywords

fine roots; seasonal pattern; decomposition; starch; carbon storage; rhizosphere; microbial community; exudate profiling; secondary metabolites; CO2 emission; forest biome; climate change

Published Papers (2 papers)

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Editorial

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2 pages, 624 KiB  
Editorial
The Ecology of Fine Roots across Forest Biomes
by Antonino Di Iorio and Agostino Sorgonà
Forests 2021, 12(5), 643; https://doi.org/10.3390/f12050643 - 19 May 2021
Viewed by 1427
Abstract
Fine root-soil interactions fundamentally affect the terrestrial carbon (C) cycle and thereby ecosystem feedbacks to climate change [...] Full article
(This article belongs to the Special Issue The Ecology of Fine Roots across Forest Biomes)

Research

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14 pages, 2183 KiB  
Article
Variations in Arbuscular Mycorrhizal Colonization Associated with Root Diameter and Hypodermis Passages Cells across Temperate and Tropical Woody Species
by Yan Wang, Zhongyue Li, Siyuan Wang, Wenna Wang, Na Wang and Jiacun Gu
Forests 2022, 13(2), 140; https://doi.org/10.3390/f13020140 - 18 Jan 2022
Cited by 5 | Viewed by 1705
Abstract
Root hypodermis passage cells (PCs) lack suberin and lignin deposition, responsible for nutrient absorption and arbuscular mycorrhizal colonization, which are crucial for root resource acquisition. Nevertheless, their quantitative variability across diverse woody species and their relationships with root morphology and anatomy, as well [...] Read more.
Root hypodermis passage cells (PCs) lack suberin and lignin deposition, responsible for nutrient absorption and arbuscular mycorrhizal colonization, which are crucial for root resource acquisition. Nevertheless, their quantitative variability across diverse woody species and their relationships with root morphology and anatomy, as well as arbuscular mycorrhizal colonization, are still not well understood. Herein, the number and proportion of PCs in the root cross-section, root morphology, anatomy, and arbuscular mycorrhizal colonization rate were quantified across 10 temperate and 12 tropical woody species. The objectives of this study were to determine how PCs vary across contrasting environmental conditions and to explore their relationships with arbuscular mycorrhizal colonization rate and other root functional traits. The results showed that tropical species possessed 56% more PCs than temperate species; by contrast, they had similar proportions of PCs. In both biomes, the number of PCs had a tightly positive correlation with arbuscular mycorrhizal colonization rate (R2 = 0.35–0.87), root diameter (R2 = 0.84–0.93), and cortex thickness (R2 = 0.87–0.89), but the proportion of PCs was mostly independent of root morphological and anatomical traits. Our results suggest that variation in passage cells could well explain the tight linkage between arbuscular mycorrhizal colonization and root diameter across species and biomes, which provides insight into the collaboration gradient between plant roots and mycorrhizal fungi that dominates the root economics space. Full article
(This article belongs to the Special Issue The Ecology of Fine Roots across Forest Biomes)
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