Dynamic change of organic acids secreted from wheat roots in Mn deficiency

Zhenfeng, AN; Fang, Zheng; Li, Yingli

doi:10.1007/s11703-008-0011-9

Cited by 10 publications

(2 citation statements)

References 6 publications

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“…in 2020 ( Figures 3C , D ). Wheat can release malic acid and benzoxazinoids in root exudates, which attract Bacillus and Pseudomonas spp., respectively ( Fang et al, 2008 ; Berendsen et al, 2012 ). Therefore, the increase in the relative abundance of potential plant-beneficial bacteria in the W and WRB treatments might be partly attributed to the release of secondary metabolites from wheat root exudates or litter decomposition ( Berendsen et al, 2012 ).…”

Section: Discussionmentioning

confidence: 99%

Cover Crop Species Composition Alters the Soil Bacterial Community in a Continuous Pepper Cropping System

et al. 2022

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Cover crops can improve soil biological health and alter the composition of soil microbial communities in agricultural systems. However, the effects of diversified cover crops on soil microbial communities in continuous cropping systems are unclear. Here, using different soil biochemical analysis, quantitative PCR and 16S rRNA amplicon sequencing, we investigated the effects of cover crops, alone or in mixture, on soil physicochemical properties in 2019 and 2020, and soil bacterial communities in 2020 in a continuous pepper cropping system. A field trial was established before pepper planting and eight treatments were included: fallow (no cover crop; CK); three sole cover crop treatments: wheat (Triticum aestivum L.; W), faba bean (Vicia faba L.; B), and wild rocket (Diplotaxis tenuifolia; R); and four mixed treatments: wheat + wild rocket (WR), wheat + faba bean (WB), wild rocket + faba bean (RB), and wheat + wild rocket + faba bean (WRB). The pepper yield was increased in the WR and WB in 2019 and 2020, and in the WRB in 2020. Cover crops increased the soil pH, but decreased the concentrations of NH4+ and available phosphorus. Bacterial abundance was increased by cover crop treatments, and community structure was altered in the W, WB, and WRB treatments. Moreover, we found that pH was the key factor associated with the changes in the abundance and structure of the bacterial community. Cover crop treatments altered the bacterial community structure with shifts in the dominant genera, which have plant-growth-promoting and/or pathogen-antagonistic potentials, e.g., increased the abundances of Streptomyces, Arthrobacter, and Bacillus spp. in the W and WRB, and Gaiella spp. in the WB. Overall, we found that cover crops altered the soil physicochemical properties and bacterial community, and these changes varied with species composition of the cover crops, with wheat and its combination with legumes as most effective treatments. These results suggest that the diversification within cover crops could provide better crop yield stimulatory affects by altering soil biochemical environment.

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Section: Discussionmentioning

confidence: 99%

Cover Crop Species Composition Alters the Soil Bacterial Community in a Continuous Pepper Cropping System

et al. 2022

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“…The collection of root exudates and their analysis for organic acids was done following the method of Fang et al (2008), with some changes in the chromatographic conditions. The root exudates were collected after two weeks of the salt treatment.…”

Section: Root-exudates Collection and Analysismentioning

confidence: 99%

Effect of salinity on rhizosphere acidification and antioxidant activity of two acacia species

et al. 2015

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Salinity is a major environmental stress that is reducing crop yield, particularly in arid and semi-arid regions of the world. It is responsible for many physiological and biochemical disorders in plants. To investigate its effects on two acacia species, namely Acacia ampliceps Maslin and Acacia nilotica L., a solution-culture experiment was conducted in which both species were exposed to NaCl concentrations of 100 and 200 mmol·L -1 . After four weeks of salinity stress, plants were harvested, and physical-growth data were recorded. The membrane stability index and activities of antioxidants enzymes such as superoxide dismutase, peroxidase, and catalase were determined using standard methods. Root exudates were collected for the analysis of organic acids, i.e., citric acid and tartaric acid. Root ash alkalinity was also measured. The results indicated that salinity stress caused a significant increase in the activities of antioxidant enzymes and in the release of organic acids in both species. Higher activities of antioxidant enzymes resulted in less damage to membranes and produced more shoot and root biomass in A. ampliceps than in A. nilotica. Likewise, having more rhizosphere acidification enabled A. ampliceps to respond in a better way to salinity stress than A. nilotica.Résumé : La salinité est un stress environnemental majeur qui réduit le rendement des cultures particulièrement dans les régions arides et semi-arides du globe. Elle est responsable de plusieurs désordres physiologiques et biochimiques chez les plantes. Afin d'étudier ses effets sur deux espèces d'acacia, à savoir Acacia ampliceps Maslin et A. nilotica L., une expérience en milieu de culture liquide où les deux espèces ont été exposées à des concentrations de 100 et 200 mmol·L -1 de NaCl a été réalisée. Après quatre semaines de stress salin, les plantes ont été récoltées et des données de croissance ont été notées. L'indice de stabilité membranaire et l'activité d'enzymes antioxydantes telles que la superoxyde dismutase, la peroxydase et la catalase ont été mesurés à l'aide de méthodes standard. Des exsudats racinaires ont été collectés pour l'analyse des acides organiques, c.-à -d. l'acide citrique et l'acide tartrique. L'alcalinité de la cendre de racine a aussi été mesurée. Les résultats indiquent que la salinité cause une augmentation significative de l'activité des enzymes antioxydantes et la libération d'acides organiques chez les deux espèces. Avec l'augmentation de l'activité des enzymes antioxydantes il y avait moins de dommages aux membranes et une plus grande production de biomasse racinaire et caulinaire chez A. ampliceps que chez A. nilotica. De même, l'acidification plus prononcée de la rhizosphère a permis à A. ampliceps de mieux réagir à la salinité que sa contrepartie. [Traduit par la Rédaction]

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Genotypic variation in partitioning of dry matter and manganese between source and sink organs of rice under manganese stress

Jhanji

Sadana

2014

Plant Cell Rep

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Genetic variability in dry matter and manganese partitioning between source and sink organs was the key mechanism for Mn efficient rice genotypes to cope with Mn stress. Considerable differences exist among cereal genotypes to cope manganese (Mn) deficiency, but the underlying mechanisms are poorly understood. Minimal information regarding partitioning and/or remobilization of dry matter and Mn between source and sink organs exists in rice genotypes differing in Mn efficiency. The present study was aimed to assess the growth dynamics in terms of dry matter and Mn remobilization in the whole plant (leaves and tillers as source and panicles and grains as sink) during the grain development in diverse rice genotypes. The efficient genotypes accumulated higher dry matter than inefficient genotypes under low Mn level. The translocation index i.e., uptake in grain/total uptake was 0.11 in efficient genotype (PR 116) and 0.04 in inefficient genotypes (PR 111). The efficient genotype had higher grain Mn utilization efficiency of 0.71 in comparison to 0.48 of inefficient genotype indicating that in efficient genotype, Mn in grain produces more dry matter than inefficient genotypes. The efficient genotypes also had higher flag leaf area and nitrate reductase activity. The source of efficient genotypes contributed to a greater extent to developing sink but further mobilization to grain was hindered by panicle. The panicle of inefficient genotypes had higher per cent of Mn uptake than efficient genotypes indicating that Mn was least mobilized from panicle to grain in inefficient genotypes. The lower per cent uptake of Mn in efficient genotypes indicated that Mn was mobilized from panicle to developing grain and this led to higher Mn translocation index in grain of efficient genotypes. The uptake partitioning revealed that source of all genotypes mobilized the Mn towards the sink to almost same extent but it was the panicle where highest per cent uptake per plant was in inefficient genotypes and lowest in efficient genotypes. The lowest per cent uptake in panicle of efficient genotypes revealed that it supported developing grain to have highest translocation index.

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Dynamic change of organic acids secreted from wheat roots in Mn deficiency

Cited by 10 publications

References 6 publications

Cover Crop Species Composition Alters the Soil Bacterial Community in a Continuous Pepper Cropping System

Cover Crop Species Composition Alters the Soil Bacterial Community in a Continuous Pepper Cropping System

Effect of salinity on rhizosphere acidification and antioxidant activity of two acacia species

Genotypic variation in partitioning of dry matter and manganese between source and sink organs of rice under manganese stress

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