Explore the vast range of titles available.

Urbanization and associated forest conversions have given rise to a continuum of native (forest fragments) and modified (artificial grasslands and perennial ecosystems) land-use types. However, little is known about how these shifts affect soil and fine-root compartments that are critical to a functioning carbon and nutrient circulation system. In this study, soil physicochemical properties, fine-root mass, and vertical distribution patterns were investigated in four representative urban land-use types: grassland (ZJ), perennial agroecosystem (MP), broadleaf deciduous forest patch (QA), and coniferous evergreen forest patch (PD). We quantified the fine-root mass in the upper 30 cm vertical profile (0–30 cm) and at every 5 cm depth across three diameter classes (<2 mm, 2–5 mm, and <5 mm). Soil physicochemical properties, except for phosphorus, nitrogen, ammonium nitrogen, and sodium cations, varied significantly across land-use types. The total root biomass (<5 mm) decreased in the order of QA (700.3 g m−2) > PD (487.2 g m−2) > ZJ (440.1 g m−2) > MP (98.3 g m−2). The fine-root mass of ZJ and MP was correlated with soil nutrients, which was attributed to intensive management operations, while the fine-root mass of QA and PD had a significant relationship with soil organic matter due to the high inputs from forest litter. Very fine roots (<2 mm) presented a distinct decremental pattern with depth for all land-use types, except for MP. Very fine roots populated the topmost 5 cm layer in ZJ, QA, and PD at 52.1%, 49.4%, and 39.4%, respectively. Maintaining a woody fine-root system benefits urban landscapes by promoting soil stabilization, improving ground infiltration rates, and increasing carbon sequestration capacity. Our findings underscore the importance of profiling fine-root mass when assessing urban expansion effects on terrestrial ecosystems.

Background Understanding the processes underlying carbon storage and balance is critical for equipping the terrestrial biosphere to respond to contemporary climatic challenges. However, ecosystem-level estimates and distribution of net primary productivity (NPP), a metric for evaluating forest carbon cycling patterns and dynamics, remain constrained by uneven empirical observations between above- and belowground fractions. We herein quantified the rate and composition of NPP for four stands characteristic of the cool-temperate deciduous ( Larix kaempferi , LK; Quercus mongolica , QM) and evergreen ( Pinus densiflora , PD; Pinus koraiensis , PK) forests of South Korea over a complete annual cycle (2022–2023). Variations in dynamic NPP compartments, particularly (1) canopy litterfall by stand and season and (2) fine root production by stand, diameter class, and depth interval, were further characterized using litter traps and ingrowth cores, respectively. Results Total NPP varied from 1226 ± 101 to 1796 ± 154 g m −2  yr −1 , with 78–84% allocated aboveground and 16–22% belowground. LK and QM exhibited total NPP up to 46% higher than PD and PK. Both litterfall and fine root production differed considerably across stands, decreasing in the order of QM > PK > PD > LK for litterfall and QM & PD > LK & PK for fine root production. Litterfall peaked in autumn, similar to the leaf phenological rhythm of many temperate deciduous species. In contrast, fine root production showed a negative vertical distribution with depth, which is consistent with decreasing nutrient availability and increasing mechanical impedance along the soil profile. Conclusions By disentangling the contribution levels and dynamic patterns of each NPP compartment, our findings demonstrate a strong inclination toward aboveground NPP investment when belowground resources are not limiting. In other words, an adequate nutrient supply enables plants to modify their priority allocation from fine root maintenance to internal resource transport, leaf production, canopy expansion, reproduction, and other critical aboveground functions. Such information underscores the necessity for forest management strategies that target soil fertility to strengthen not only canopy productivity and CO 2 sequestration but also ecosystem resilience by reinforcing allocation patterns that sustain high NPP and safeguard forests against shifting climate conditions.

Reversible protein phosphorylation is a key regulatory mechanism governing polar auxin transport. We characterized the auxin transport and gravitropic phenotypes of the pinoid-9 (pid-9) mutant of Arabidopsis (Arabidopsis thaliana) and tested the hypothesis that phosphorylation mediated by PID kinase and dephosphorylation regulated by the ROOTS CURL IN NAPHTHYLPHTHALAMIC ACID1 (RCN1) protein might antagonistically regulate root auxin transport and gravity response. Basipetal indole-3-acetic acid transport and gravitropism are reduced in pid-9 seedlings, while acropetal transport and lateral root development are unchanged. Treatment of wild-type seedlings with the protein kinase inhibitor staurosporine phenocopies the reduced auxin transport and gravity response of pid-9, while pid-9 is resistant to inhibition by staurosporine. Staurosporine and the phosphatase inhibitor, cantharidin, delay the asymmetric expression of DR5::revGFP (green fluorescent protein) at the root tip after gravistimulation. Gravity response defects of rcn1 and pid-9 are partially rescued by treatment with staurosporine and cantharidin, respectively. The pid-9 rcn1 double mutant has a more rapid gravitropic response than rcn1. These data are consistent with a reciprocal regulation of gravitropism by RCN1 and PID. Furthermore, the effect of staurosporine is lost in pinformed2 (pin2). Our data suggest that reduced PID kinase function inhibits gravitropism and basipetal indole-3-acetic acid transport. However, in contrast to PID overexpression studies, we observed wild-type asymmetric membrane distribution of the PIN2 protein in both pid-9 and wild-type root tips, although PIN2 accumulates in endomembrane structures in pid-9 roots. Similarly, staurosporine-treated plants expressing a PIN2::GFP fusion exhibit endomembrane accumulation of PIN2::GFP, but no changes in membrane asymmetries were detected. Our data suggest that PID plays a limited role in root development; loss of PID activity alters auxin transport and gravitropism without causing an obvious change in cellular polarity.

Perennial grasses and legumes are important for the reclamation of salt‐affected land. A comparison study on salt tolerance of alfalfa ( Medicago sativa L.) and hybrid wheatgrass ( Elymus hoffmannii ) could contribute to understanding the relative salt tolerance of these species, in addition to providing germplasm information for salt tolerant forage breeding. In this study, three alfalfa cultivars (Halo, Rugged, and Beaver) and four hybrid wheatgrass populations (CDC Salt King, AC Saltlander, S9600, and S9604) were evaluated at 0, 8, and 16 dS m −1 in a sand‐based hydroponics system in greenhouse. Plant height, relative chlorophyll content, plant injury score, biomass, and ion accumulation in different tissues were measured. Salt stress reduced plant height in both species. Stem number in alfalfa, but not in hybrid wheatgrass, was affected by salt stress, suggesting a loss of persistence of alfalfa cultivars under salt stress. Salt stress reduced root, stem, and leaf dry weights in both species with considerable variation between the two forage species. Hybrid wheatgrass showed a negative association ( r  = −0.56) between tiller number and root Na + concentration under moderate salt stress. Alfalfa cultivar Halo showed higher Na + accumulation in both leaf and root with lower reduction in leaf dry weight under salt stress. In contrast, hybrid wheatgrass displayed lower Na + accumulation in leaves despite higher Na + accumulation in the roots, indicating that the salt tolerance of this grass is due to an altered root–shoot Na + transport. The variable responses of salt stress in alfalfa and hybrid wheatgrass indicate different mechanisms for salt tolerance. Perennial grasses and legumes are important for the reclamation of salt‐affected land. A comparison study on salt tolerance of alfalfa ( Medicago sativa L.) and hybrid wheatgrass ( Elymus hoffmannii ) could contribute to understanding the relative salt tolerance of these species, in addition to providing germplasm information for salt tolerant forage breeding. In this study, three alfalfa cultivars (Halo, Rugged and Beaver) and four hybrid wheatgrass populations (CDC Salt King, AC Saltlander, S9600, and S9604) were evaluated at 0, 8, and 16 dS m −1 in a sand‐based hydroponics system in greenhouse. Plant height, relative chlorophyll content, plant injury score, biomass, and ion accumulation in different tissues were measured. Salt stress reduced plant height in both species. Stem number in alfalfa, but not in hybrid wheatgrass, was affected by salt stress, suggesting a loss of persistence of alfalfa cultivars under salt stress. Salt stress reduced root, stem, and leaf dry weights in both species.

The COVID-19 pandemic has severely impacted global business operations. Most importantly, practitioners of small- and medium-sized enterprises (SMEs) have been facing devastating economic shocks emanated from the COVID-19 pandemic. The purposes of this study are to explore the business status of SMEs, business sustenance period, types of problems faced by the practitioners and impact on production volume, due to the COVID-19 pandemic. For these purposes, primary survey data from 284 SMEs in Bangladesh are collected in this study. The survey data are descriptively analyzed using appropriate graphs. This study finds that SMEs are facing several problems such as demand fall (92.96%), cancellation of orders (85.56%), liquidity crisis (74.30%), delayed transportation (72.53%), unsecured working environment (68.31%), raw material shortage (63.73%) and employees’ absenteeism (62.67%). The SMEs face beyond 40% decrease in production volume against the pre-pandemic year. Furthermore, this study formulates several strategic measures, which will certainly guide policymakers and practitioners to combat the COVID-19 economic shocks for the SMEs and also for other industries.

p-Chlorophenoxyisobutyric acid (PCIB) is known as a putative antiauxin and is widely used to inhibit auxin action, although the mechanism of PCIB-mediated inhibition of auxin action is not characterized very well at the molecular level. In the present work, we showed that PCIB inhibited BA::β-glucuronidase (GUS) expression induced by indole-3-acetic acid (IAA), 2,4-dichlorophenoxyacetic acid, and 1-naphthaleneacetic acid. PCIB also inhibited auxin-dependent DR5::GUS expression. RNA hybridization and quantitative reverse transcriptase-polymerase chain reaction analyses suggested that PCIB reduced auxin-induced accumulation of transcripts of Aux/IAA genes. In addition, PCIB relieved the reduction of GUS activity in HS::AXR3NT-GUS transgenic line in which auxin inhibits GUS activity by promoting degradation of the AXR3NT-GUS fusion protein. Physiological analysis revealed that PCIB inhibited lateral root production, gravitropic response of roots, and growth of primary roots. These results suggest that PCIB impairs auxin-signaling pathway by regulating Aux/IAA protein stability and thereby affects the auxin-regulated Arabidopsis root physiology.

This study aims to test the role of pricing practices as an intervening variable in the relationship between service innovation management practices (innovation strategy, innovation process, cross-functional organisation, tools/technology, and system integration) and firms’ performance in an emerging economy. Data were collected from 249 managers representing the Malaysian telecommunications sector using a structured questionnaire. Structural equation modelling (SEM) with SmartPLS software, version 3, was used to achieve the research objectives and to analyse the measurements and structural model. The results showed that, whereas innovation strategy, innovation process, cross-functional organisation, and system integration positively influence pricing practice, tools and technology has an insignificant effect on pricing practice. Interestingly, pricing practice mediates the relationship between innovation strategy and system integration regarding firm performance. The findings of this study suggest that, in the formulation of such a strategy, service firms should consider the pricing factor. Telecommunications service providers could use this model to implement pricing practices particularly driven by innovation practices to achieve the desired performance. The study could also assist managers in understanding suitable pricing practices in the context of the telecommunications industry. The originality of this study lies in the effort to adjoin service innovation management practices with pricing practices that lead to improving the performance of the telecommunications industry.

Reversible protein phosphorylation is a key regulatory mechanism governing polar auxin transport. We characterized the auxin transport and gravitropic phenotypes of the pinoid-9 (pid-9) mutant of Arabidopsis (Arabidopsis thaliana) and tested the hypothesis that phosphorylation mediated by PID kinase and dephosphorylation regulated by the ROOTS CURL IN NAPHTHYLPHTHALAMIC ACID1 (RCN1) protein might antagonistically regulate root auxin transport and gravity response. Basipetal indole-3-acetic acid transport and gravitropism are reduced in pid-9 seedlings, while acropetal transport and lateral root development are unchanged. Treatment of wild-type seedlings with the protein kinase inhibitor staurosporine phenocopies the reduced auxin transport and gravity response of pid-9, while pid-9 is resistant to inhibition by staurosporine. Staurosporine and the phosphatase inhibitor, cantharidin, delay the asymmetric expression of DR5revGFP (green fluorescent protein) at the root tip after gravistimulation. Gravity response defects of rcn1 and pid-9 are partially rescued by treatment with staurosporine and cantharidin, respectively. The pid-9 rcn1 double mutant has a more rapid gravitropic response than rcn1. These data are consistent with a reciprocal regulation of gravitropism by RCN1 and PID. Furthermore, the effect of staurosporine is lost in pinformed2 (pin2). Our data suggest that reduced PID kinase function inhibits gravitropism and basipetal indole-3-acetic acid transport. However, in contrast to PID overexpression studies, we observed wild-type asymmetric membrane distribution of the PIN2 protein in both pid-9 and wild-type root tips, although PIN2 accumulates in endomembrane structures in pid-9 roots. Similarly, staurosporine-treated plants expressing a PIN2GFP fusion exhibit endomembrane accumulation of PIN2GFP, but no changes in membrane asymmetries were detected. Our data suggest that PID plays a limited role in root development; loss of PID activity alters auxin transport and gravitropism without causing an obvious change in cellular polarity.