Coordination of root growth with root morphology, physiology and defense functions in response to root pruning in Platycladus orientalis

Feng, Zhipei; Kong, Deliang; Kong, Yali; Zhang, Baohong; Yang, Xiujuan

doi:10.1016/j.jare.2021.07.005

Cited by 12 publications

(8 citation statements)

References 59 publications

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“…As mentioned previously, SPAD had a significant positive correlation with clay content (Figure 1A). Under water-saving irrigation, with the increase of clay content, larger cracks formed in field could stretch and tear the roots, which is similar to the effect of root pruning (Bordoloi et al, 2020), which could decrease both stomatal conductance and transpiration due to the pruninginduced root signals (Ma et al, 2008;Feng et al, 2022). In this study, the large cracks observed under the same AWD regime with high clay content might suggest a strong stress signal generated by root pruning.…”

Section: Relationship Between Organs D 15 N and Wuesupporting

confidence: 64%

Relationships between stable isotope natural abundances (δ13C and δ15N) and water use efficiency in rice under alternate wetting and drying irrigation in soils with high clay contents

et al. 2022

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Natural abundance of the stable isotope (δ13C and δ15N) in plants is widely used to indicate water use efficiency (WUE). However, soil water and texture properties may affect this relationship, which remains largely elusive. Therefore, the purpose of this study was to evaluate δ13C as affected by different combinations of alternate wetting and drying irrigation (AWD) with varied soil clay contents in different organs and whole plant and assess the feasibility of using δ13C and δ15N as a physiological indicator of whole-plant water use efficiency (WUEwhole-plant). Three AWD regimes, I100 (30 mm flooded when soil reached 100% saturation), I90 (30 mm flooded when reached 90% saturation) and I70 (30 mm flooded when reached 70% saturation) and three soil clay contents, 40% (S40), 50% (S50), and 60% (S60), were included. Observed variations in WUEwhole-plant did not conform to theoretical expectations of the organs δ13C (δ13Corgans) of plant biomass based on pooled data from all treatments. However, a positive relationship between δ13Cleaf and WUEET (dry biomass/evapotranspiration) was observed under I90 regime, whereas there were no significant relationships between δ13Corgans and WUEET under I100 or I70 regimes. Under I100, weak relationships between δ13Corgans and WUEET could be explained by (i) variation in C allocation patterns under different clay content, and (ii) relatively higher rate of panicle water loss, which was independent of stomatal regulation and photosynthesis. Under I70, weak relationships between δ13Corgans and WUEET could be ascribed to (i) bigger cracks induced by water-limited irrigation regime and high clay content soil, and (ii) damage caused by severe drought. In addition, a negative relationship was observed between WUEwhole-plant and shoot δ15N (δ15Nshoot) across the three irrigation treatments, indicating that WUEwhole-plant is tightly associated with N metabolism and N isotope discrimination in rice. Therefore, δ13C should be used cautiously as an indicator of rice WUEwhole-plant at different AWD regimes with high clay content, whereas δ15N could be considered an effective indicator of WUEwhole-plant.

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Section: Relationship Between Organs D 15 N and Wuesupporting

confidence: 64%

Relationships between stable isotope natural abundances (δ13C and δ15N) and water use efficiency in rice under alternate wetting and drying irrigation in soils with high clay contents

et al. 2022

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“…Although the internal mechanism is still unclear, which might be related with the changes of hormones after fertilization, because auxin could cause an increase in root PG number ( Aloni et al, 2006 ; Baba et al, 2018 ). More importantly, auxin content increased after root pruning ( Feng et al, 2022 ), and exogenous nutrient addition could influence the auxin distribution, i.e., nitrate inducing auxin signaling in the pericycle ( Perotti et al, 2021 ), ammonium affecting auxin diffusion toward the overlying cells of root vasculature ( Meier et al, 2020 ). Therefore, more accumulation and targeted distribution of IAA occurred in the root vascular bundle, ultimately inducing more PGs in fertilized roots.…”

Section: Discussionmentioning

confidence: 99%

The Hierarchy of Protoxylem Groupings in Primary Root and Their Plasticity to Nitrogen Addition in Three Tree Species

Wang²,

Wang³

et al. 2022

Front. Plant Sci.

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Protoxylem grouping (PG), a classification based on the number of protoxylem poles, is a crucial indicator related to other functional traits in fine roots, affecting growth and survival of individual root. However, within root system, less is known about the arrangement of PG. Moreover, the responses of PG to fertilization are still unclear. Here, we selected three common hardwood species in Northeast China, Juglans mandshurica, Fraxinus mandshurica, and Phellodendron amurense, conducted root pruning and nutrient addition. In this study, we analyzed the PG, morphology, and other anatomy traits of newly formed root branches. The results showed all root length, diameter, and stele, as well as hydraulic conductivity, were significantly positive related to the PG number, and the PG number generally decreased with ascending root developmental order; these patterns were independent of species and fertilization. Additionally, we also found the plasticity of PGs to environmental changes, in terms of the increased frequency of high PG roots after fertilization, significantly in J. mandshurica and F. mandshurica. Therefore, the heterogeneity, hierarchy, and plasticity of individual roots within root system may be widespread in woody plants, which is of great significance to deepen our understanding in root growth and development, as well as the belowground ecological process.

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“…Significant shifts in root growth, morphology, and physiology have frequently been observed after root pruning. Lateral root growth was greatly enhanced in Platycladus orientalis after root pruning ( Feng et al., 2022 ). Compensatory increases in the specific root length, fine root vitality, and the ratio of fine roots to the total root mass have been reported in rice ( Kawai et al., 2022 ), soybean ( Fanello et al., 2020 ), and Cunninghamia lanceolata ( Dong et al., 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…Plant responses to root pruning are complex and encompass many aspects resulting in changes in growth and biomass allocation patterns. Root pruning has been reported to promote the growth of fine roots ( Feng et al., 2022 ) and flowering ( Budiarto et al., 2019 ). Further, root pruning can reduce nutrient and water competition between roots and grains ( Fanello et al., 2020 ).…”

Section: Introductionmentioning

confidence: 99%

“…Plant hormones are believed to be involved in the regulation of Lpr and water uptake ( Aroca, 2006 ). The contents of abscisic acid (ABA) and jasmonic acid (JA) in roots were significantly increased by root pruning ( Feng et al., 2022 ). In roots, ABA enhanced Lpr and improved plant water status ( Tardieu et al., 2010 ; Olaetxea et al., 2015 ).…”

Section: Introductionmentioning

confidence: 99%

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Root pruning improves maize water-use efficiency by root water absorption

Yan

Zhang

Li³

et al. 2023

Front. Plant Sci.

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Root systems are an important component of plants that impact crop water-use efficiency (WUE) and yield. This study examined the effects of root pruning on maize yield, WUE, and water uptake under pot and hydroponic conditions. The pot experiment showed that root pruning significantly decreased root/shoot ratio. Both small root pruning (cut off about 1/5 of the root system, RP1) and large root pruning (cut off about 1/3 of the root system, RP2) improved WUE and root hydraulic conductivity (Lpr) in the residual root system. Compared with that in the un-cut control, at the jointing stage, RP1 and RP2 increased Lpr by 43.9% and 31.5% under well-watered conditions and 27.4% and 19.8% under drought stress, respectively. RP1 increased grain yield by 12.9% compared with that in the control under well-watered conditions, whereas both pruning treatments did not exhibit a significant effect on yield under drought stress. The hydroponic experiment demonstrated that root pruning did not reduce leaf water potential but increased residual root hydraulic conductivity by 26.2% at 48 h after root pruning under well-watered conditions. The foregoing responses may be explained by the upregulation of plasma membrane intrinsic protein gene and increases in abscisic acid and jasmonic acid in roots. Increased auxin and salicylic acid contributed to the compensated lateral root growth. In conclusion, root pruning improved WUE in maize by root water uptake.

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Coordination of root growth with root morphology, physiology and defense functions in response to root pruning in Platycladus orientalis

Abstract: Graphical abstract

Cited by 12 publications

References 59 publications

Relationships between stable isotope natural abundances (δ13C and δ15N) and water use efficiency in rice under alternate wetting and drying irrigation in soils with high clay contents

Relationships between stable isotope natural abundances (δ13C and δ15N) and water use efficiency in rice under alternate wetting and drying irrigation in soils with high clay contents

The Hierarchy of Protoxylem Groupings in Primary Root and Their Plasticity to Nitrogen Addition in Three Tree Species

Root pruning improves maize water-use efficiency by root water absorption

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