Poplar woody taproot under bending stress: the asymmetric response of the convex and concave sides

Zio, Elena De; Trupiano, Dalila; Montagnoli, Antonio; Terzaghi, Mattia; Chiatante, Donato; Grosso, Alessandro; Marra, Mauro; Scaloni, Andrea; Scippa, Gabriella Stefania

doi:10.1093/aob/mcw159

Cited by 22 publications

(49 citation statements)

References 102 publications

(107 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, in the bent stem of different woody plant species, auxin tends to accumulate toward the cambium side producing RW (Funada et al , Uggla et al , Du et al ). In root, IAA preferentially accumulates toward the concave compressed side, where cambial cells number/activity is increased and RW formed (De Zio et al ). Despite this, still little is known about how the auxin distribution regulates the sequence of developmental events and how environmental signals can modulate auxin levels in wood‐forming tissues.…”

Section: Discussionmentioning

confidence: 99%

“…It can be supposed that this IAA CZ‐centered gradient might have been formed by a PIN compression forces‐induced redistribution, although this has not been experimentally demonstrated yet. The IAA asymmetry observed in Xy dev could trigger the observed rapid xylem differentiation, producing narrow vessels and short fibers with thinner secondary walls and, thus, the RW formation toward the concave side (De Zio et al ).…”

Section: Discussionmentioning

confidence: 99%

“…The hormone signaling pathways involved in RW formation in woody plants and the interaction between them are still poorly understood, especially at the root level (Du and Yamamoto ). In previous studies, we observed that an asymmetrical distribution of mechanical forces triggered RW deposition on the compressed concave side, subjected to the highest compression forces, and the formation of new lateral roots on the convex side, subjected to the highest tension forces (Trupiano et al , , , Rossi et al , De Zio et al ). Furthermore, this RW was characterized by a low vessel density and a high lignin content and induced by a noticeable increase of cambium cell activity.…”

Section: Introductionmentioning

confidence: 88%

“…Furthermore, this RW was characterized by a low vessel density and a high lignin content and induced by a noticeable increase of cambium cell activity. First insights into the mechanisms regulating this compression‐induced wood on the concave side were represented by the up‐regulation of specific proteins controlling cell wall deformation, lignification and xylem differentiation and the high levels of auxin and ABA (De Zio et al ).…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, we expected to find a specific gradient of this hormone in the convex and concave cambium zones of poplar bent root, necessary to confer positional information to the developing cells and to trigger differential responses on the two sides, acting in an antagonistic or synergic crosstalk with ABA and CKs. Despite evidence of ABA and CKs responsiveness to mechanical stimuli (Scippa et al , Trupiano et al , De Zio et al ), the role of these hormones in RW formation remains to be elucidated (Du and Yamamoto ). To achieve this, a detailed profiling of IAA, ABA and CKs and their metabolites was carried out in the cambial zone (CZ) and its surrounding areas, such as the developing phloem (Ph dev) and xylem (Xy dev), belonging to both sides (convex and concave) of bent poplar root.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Tissue‐specific hormone profiles from woody poplar roots under bending stress

Zio

Trupiano

Karády

et al. 2018

Physiologia Plantarum

Self Cite

View full text Add to dashboard Cite

Mechanical forces induced by bending are able to trigger an asymmetrical response in Populus nigra L. woody taproots. This response includes the recruitment of new lateral roots on the convex side and the deposition of reaction wood (RW) on the opposite concave side. Since these responses seem to be induced by asymmetric activity and differentiation of cambium cells, we investigated, in the present work, how mechanical forces could influence the activation of specific phytohormone signaling pathways on the two sides of the vascular cambium. Thus, distinctive tissues were isolated from convex and concave sides of bent poplar root using cryosectioning. Successively, the isolated tissues, represented by the cambial zone, and the developing phloem and xylem, were analyzed using liquid chromatography coupled to tandem mass spectrometry to profile auxins, abscisic acid (ABA), cytokinins (CKs) and their metabolites. The auxin gradient on the concave side, with the IAA maximum localized in the cambium and decreasing level toward the developing phloem and xylem, suggests a pivotal role of IAA in the control of cambial growth rate, xylem differentiation and RW production. The IAA differences between the two bent root sides could be at the basis of the strictly unidirectional RW production. The higher levels of ABA and all CKs metabolites on the concave side support their involvement in RW production, whereby ABA could mediate the adaptation to the deforming conditions generated by bending, while CKs could act in synergy with IAA in controlling cell differentiation and meristem size.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tissue‐specific hormone profiles from woody poplar roots under bending stress

Zio

Trupiano

Karády

et al. 2018

Physiologia Plantarum

Self Cite

View full text Add to dashboard Cite

show abstract

Analysis on water use strategies of natural poplar in Hunshandake Sandy Land, China

Jia

Zhang

et al. 2021

Env Prog and Sustain Energy

View full text Add to dashboard Cite

The past decades have witnessed the increasingly severe desertification and high sandstorm frequency in Hunshandake desert, China, which evokes extensive concern regarding the ecological and environmental effects on natural plant fields. Herein, natural poplars in this area are studied in this work to analyze the water use efficiency (WUE), water absorption source (WAS), water consumption of poplar, and water use strategy (WUS). The results show that the intrinsically high WUE of poplar can be enhanced under water stress status. The 0–100 cm soil water or underground water constitutes the main WAS. Poplar uses deep soil water or underground water when there is insufficient precipitation in rainy season, which, however, turns to use easily‐absorbed precipitation water after rainfall and lives through the growing period by switching water absorption positions. The unique dimorphic root system, adjustable WUE, and adjustable WUS make poplar able to maximally use limited water resource, which is also the main strategy for its survival in arid and semi‐arid areas. The combined analyses help us to get insight into the survivability and adaptive ability of plants as well as to regulate the limited water resource. This work may pave a way for ecological community restoration and ecologically environmental improvement.

show abstract

The influence of slope on Spartium junceum root system: morphological, anatomical and biomechanical adaptation

et al. 2017

View full text Add to dashboard Cite

Root systems have a pivotal role in plant anchorage and their mechanical interactions with the soil may contribute to soil reinforcement and stabilization of slide-prone slopes. In order to understand the responses of root system to mechanical stress induced by slope, samples of Spartium junceum L., growing in slope and in plane natural conditions, were compared in their morphology, biomechanical properties and anatomical features. Soils sampled in slope and plane revealed similar characteristics, with the exception of organic matter content and penetrometer resistance, both higher in slope. Slope significantly influenced root morphology and in particular the distribution of lateral roots along the soil depth. Indeed, first-order lateral roots of plants growing on slope condition showed an asymmetric distribution between up- and down-slope. Contrarily, this asymmetric distribution was not observed in plants growing in plane. The tensile strength was higher in lateral roots growing up-slope and in plane conditions than in those growing down-slope. Anatomical investigations revealed that, while roots grown up-slope had higher area covered by xylem fibers, the ratio of xylem and phloem fibers to root diameter did not differ among the three conditions, as also, no differences were found for xylem fiber cell wall thickness. Roots growing up-slope were the main contributors to anchorage properties, which included higher strength and higher number of fibers in the xylematic tissues. Results suggested that a combination of root-specific morphological, anatomical and biomechanical traits, determines anchorage functions in slope conditions.

show abstract

Poplar woody taproot under bending stress: the asymmetric response of the convex and concave sides

Cited by 22 publications

References 102 publications

Tissue‐specific hormone profiles from woody poplar roots under bending stress

Tissue‐specific hormone profiles from woody poplar roots under bending stress

Analysis on water use strategies of natural poplar in Hunshandake Sandy Land, China

The influence of slope on Spartium junceum root system: morphological, anatomical and biomechanical adaptation

Contact Info

Product

Resources

About