Acclimation of fine root respiration to soil warming involves starch deposition in very fine and fine roots: a case study in <i>Fagus sylvatica</i> saplings

Iorio, Antonino Di; Giacomuzzi, Valentino; Chiatante, Donato

doi:10.1111/ppl.12363

Cited by 25 publications

(25 citation statements)

References 72 publications

(105 reference statements)

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“…3), with all responses being driven mainly by the enhanced formation of #0.5 mm roots. These results suggest that AP-treated seedlings of P. orientalis might possess a greater ability to adapt to increased competition and exploit belowground resources (Di Iorio et al, 2016;Perrig et al, 2007). In parallel, we only observed a significant increase in RL, RT, RSA, and SRL of 0.5-to 1-mm roots after AP on the 190th day, thus associating it to the long-term effect of AP.…”

Section: Discussionsupporting

confidence: 61%

“…Fine roots, especially #0.5-mm roots, perform important physiological functions in terms of water and nutrient uptake Perrig et al, 2007). Some investigators have also found that fine roots are involved in the synthesis of certain growth hormones and associated with root adaptations for survival in changing environments (Di Iorio et al, 2016;Makita et al, 2016;Mosca et al, 2017). We found that the fine roots (#0.5 mm) of P. orientalis seedlings under AP had significantly higher RL, RT, RSA, and SRL (except for 120 d) compared with NP at 120, 150, and 190 d (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Improvements in the Root Morphology, Physiology, and Anatomy of Platycladus orientalis Seedlings from Air-root Pruning

Feng¹,

Yang²,

Huang³

et al. 2018

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Additional index words. air-root pruning, root growth, chinese cypress Abstract. Air-root pruning (AP) has been identified as an effective technique for enhancing root growth and development. However, little information is available regarding the temporal changes in the root system of Platycladus orientalis (L.) Franco under AP. We performed integrated morphological, physiological, and anatomical analyses of the roots in P. orientalis seedlings that had been air-root pruned for 120, 150, and 190 days. Our results found that the whole root length, number of root tips, and root surface area of AP seedlings at 120, 150, and 190 days were higher than those of the non-root-pruned (NP) seedlings (P < 0.05), but the average root diameter did not differ significantly between the treatments. Compared with NP treatment, AP increased the root length, surface area, number of tips, and specific root length of the £0.5 mm diameter roots in P. orientalis during the experimental periods (P < 0.05), but those of 0.5-to 1-mm-diameter roots were only increased on day 190 (P < 0.05). The AP plants also exhibited higher root vitality and proportion of live fine roots than the NP plants (P < 0.05). Our anatomical evaluation of the £0.5 mm roots and taproots revealed features that could account for the morphological differences found between the AP and NP plants. In conclusion, our results indicate that air-root pruning induced changes in the roots that promote the root system development in P. orientalis compared with the NP treatment during the experimental period. These results thus provide experimental evidence to support the use of AP in P. orientalis seedlings.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Improvements in the Root Morphology, Physiology, and Anatomy of Platycladus orientalis Seedlings from Air-root Pruning

Feng¹,

Yang²,

Huang³

et al. 2018

horts

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“…This would be considered a form of acclimation. Similarly, Di Iorio, Giacomuzzi, and Chiatante () found that European beach ( Fagus sylvatica ) has the ability to increase concentrations of starch in the fine roots as a “carbon‐savings strategy,” and in tomato ( Solanum lycopersicum ), decreases in proteins associated with nutrient‐uptake and assimilation have occurred in response to heat‐stress levels of temperature (Giri, Heckathorn, Mishra, & Krause, ).…”

Section: Introductionmentioning

confidence: 99%

Adenylate control contributes to thermal acclimation of sugar maple fine‐root respiration in experimentally warmed soil

Jarvi

Burton

2017

Plant Cell & Environment

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We investigated the occurrence of and mechanisms responsible for acclimation of fine-root respiration of mature sugar maple (Acer saccharum) after 3+ years of experimental soil warming (+4 to 5 °C) in a factorial combination with soil moisture addition. Potential mechanisms for thermal respiratory acclimation included changes in enzymatic capacity, as indicated by root N concentration; substrate limitation, assessed by examining nonstructural carbohydrates and effects of exogenous sugar additions; and adenylate control, examined as responses of root respiration to a respiratory uncoupling agent. Partial acclimation of fine-root respiration occurred in response to soil warming, causing specific root respiration to increase to a much lesser degree (14% to 26%) than would be expected for a 4 to 5 °C temperature increase (approximately 55%). Acclimation was greatest when ambient soil temperature was warmer or soil moisture availability was low. We found no evidence that enzyme or substrate limitation caused acclimation but did find evidence supporting adenylate control. The uncoupling agent caused a 1.4 times greater stimulation of respiration in roots from warmed soil. Sugar maple fine-root respiration in warmed soil was at least partially constrained by adenylate use, helping constrain respiration to that needed to support work being performed by the roots.

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“…Root orders along the branching hierarchy of roots < 2 mm in diameter encompass a diversity of forms and functions (Long et al 2013;Iversen et al 2017). In various studies with different species, fine root traits such as respiration (Di Iorio et al 2015), production, lifespan, and decomposition rate (Gill and Jackson 2000;Guo et al 2008, McCormack et al 2012Sun et al 2013;Van Do et al 2016), carbon, starch, and nitrogen concentration (Terzaghi et al 2013(Terzaghi et al , 2016, and relationship with soil temperature and water content (Montagnoli et al 2012a(Montagnoli et al , 2014 vary seasonally. Moreover, this seasonal fine root growth is of different magnitude and type (i.e., longitudinal and radial) depending on the diameter class considered.…”

Section: Introductionmentioning

confidence: 99%

An integrated method for high-resolution definition of new diameter-based fine root sub-classes of Fagus sylvatica L.

Montagnoli

Terzaghi

Giussani

et al. 2018

Annals of Forest Science

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& Key message Compared to the traditional approach, applying micrometric image analysis to fine root samples of Fagus sylvatica with subsequent data treatment through principal component and cluster analysis yielded specific diameter sizes for fine root sub-classes having better resolution of the corresponding branching orders, and a more coherent relationship with the values of annual production and turnover rate. & Context Fine root traits are poorly understood, impeding an accurate representation of terrestrial biogeochemical models. Traditionally used, arbitrary diameter thresholds lead to a misestimation of fine root traits such as branching order, environmental relationship, annual production, and turnover rate. & Aims Here, we present, as modification of the traditional method, an integrated approach to segregate, at high-resolution, fine root populations of Fagus sylvatica into new diameter sub-classes that better correspond with the traits mentioned above. & Methods Samples, collected with a sequential soil coring method, were subjected to a micrometric image analysis, and resultant data were treated with principal component and cluster analysis. & Results Results showed that fine roots were distributed into diameter-size sub-classes (0-0.3 mm, 0.3-1 mm, and 1-2 mm) different from those determined by traditional methods (0-0.5 mm, 0.5-1 mm, and 1-2 mm). New sub-classes provided a better resolution of the corresponding branching-orders, and the values of annual production and turnover rate were more coherent with diameter class and soil depth. Moreover, new sub-classes provided a more precise match with soil temperature than traditional methods. & Conclusion Our method may help to unveil fine root dynamics and development, reduce data analysis time, and make the diameter-based classification more precise and trustworthy even in the case of non-intact samples.

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Acclimation of fine root respiration to soil warming involves starch deposition in very fine and fine roots: a case study in Fagus sylvatica saplings

Cited by 25 publications

References 72 publications

Improvements in the Root Morphology, Physiology, and Anatomy of Platycladus orientalis Seedlings from Air-root Pruning

Improvements in the Root Morphology, Physiology, and Anatomy of Platycladus orientalis Seedlings from Air-root Pruning

Adenylate control contributes to thermal acclimation of sugar maple fine‐root respiration in experimentally warmed soil

An integrated method for high-resolution definition of new diameter-based fine root sub-classes of Fagus sylvatica L.

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