Regulatory role of organic acids and phytochelators in influencing the rhizospheric availability of phosphorus and iron and their uptake by plants

Mitra, Raktim; Yadav, Poonam; Usha, K.

doi:10.1007/s40502-022-00650-3

Cited by 7 publications

(5 citation statements)

References 98 publications

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“…Additionally, increased soil moisture and electrical conductivity, along with organic acid release during biomass decomposition, facilitate the movement of potassium from plant tissues to the soil. Organic acids released during decomposition also form chelates with micronutrients, increasing their availability in the soil and to plants 18 . Plants more easily absorb these chelates, which are more stable than free micronutrients.…”

Section: Discussionmentioning

confidence: 99%

Enhancing soil health and fruit yield through Tephrosia biomass mulching in rainfed guava (Psidium guajava L.) orchards

Ali,

Das,

Dhakar

et al. 2024

Sci Rep

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Leguminous crop Tephrosia candida has high biomass production and contains a substantial quantity of nutrients within its biomass. Starting in 2019, a long-term study was done to find the best Tephrosia candida dose for mulching in guava orchards. The study had four treatments: T1 = 3.0 kg dry biomass m−2 of the plant basin, T2 = 2.0 kg, T3 = 1.0 kg, and T4 = control (no mulch). Every year, the treatments imposed in the month of August. The third year (2021–2022) results indicated that mulching with 3 kg of biomass m−2 increased trunk diameter, fruit yield, fruit weight, specific leaf area, total leaf chlorophyll, and leaf macro- and micro-nutrients. At 3.0 kg m−2, mulching improved soil properties such as EC, available nitrogen, available phosphorus, exchangeable potassium, DTPA extractable micronutrients (Fe, Zn, Cu, and Mn), total organic carbon (Ctoc), soil organic carbon (Csoc), organic carbon fractions, and microbial biomass carbon between 0–0.15 m and 0.15–0.30 m. There was an increasing trend in dehydrogenase activity (DHA) and fluorescein diacetate (FDA). The Tephrosia leaf litter exhibited decay constants of 1.27 year−1, and the carbon content was 40.11%. Therefore, applying Tephrosia biomass mulching at a rate of 3.0 kg m−2 is a viable long-term solution for enhancing soil fertility and sequestering carbon.

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Section: Discussionmentioning

confidence: 99%

Enhancing soil health and fruit yield through Tephrosia biomass mulching in rainfed guava (Psidium guajava L.) orchards

Ali,

Das,

Dhakar

et al. 2024

Sci Rep

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“…Root‐induced chemical and biological changes, including carboxylate exudation and rhizosphere acidification, are potentially an efficient strategy to mobilise recalcitrant Ca‐P (Del‐Saz et al, 2018; Zhou et al, 2021). An increased release of small‐molecule carboxylic acids, such as citrate, is a critical mechanism of inorganic P mobilisation, which enhances soil P availability via ligand exchange and cation chelation (Ding et al, 2021; Mitra et al, 2022). In the present study, drought stimulated the release of citrate and glutaric acid by the roots of both poplar sexes on the dry site (Table ).…”

Section: Discussionmentioning

confidence: 99%

Sex‐specific phosphorus acquisition strategies and cycling in dioecious Populus euphratica forests along a natural water availability gradient

Liu,

Ye,

Chen

et al. 2024

Plant Cell & Environment

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Soil phosphorus (P) availability affects plant growth and distribution. However, it is still unknown how sex‐specific variation in functional traits affects plants’ P acquisition and soil P transformation. On wet sites, female poplars had a greater specific root length (SRL), and a higher diversity of arbuscular mycorrhizal fungi (AMF) and phosphate‐solubilizing bacteria (PSB). Male poplars living on wet sites increased the abundance of AMF and PSB communities and enhanced moderately labile and highly resistant organic P mineralisation via increased phosphatase activity. In contrast, on the dry site, the abundance and diversity of AMF and PSB communities increased in females, enhancing moderately labile and highly resistant organic P mineralisation via elevating phosphatase activities. Males maintained greater SRL and promoted Ca‐P mobilisation via the release of root carboxylic acids and rhizosphere acidification on the dry site. The AMF community diversity followed a similar pattern as that of the PSB community when altering the P availability of different‐sex plants. Our results indicated that organic P and Ca‐P are the major sources of plant‐available P in natural P. euphratica forests. Seasonal shifts and geographic locations affected the share of organic and inorganic P pools, and AMF and PSB diversities, ultimately altering sex‐specific P acquisition strategies of plants.

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“…Shen [ 3 ] suggests that low pH directly affects the expression of membrane proton pumps in root cells at the transcriptional level, and indirectly affects nutrient uptake by roots and plant growth. H + in low pH environment can disrupt ion absorption patterns and reduce ion transport capacity [ 48 ], ultimately leading to decreased root ability, inhibition of root growth, and decrease of root/shoot ratio (Figs 1 and 3 ). In summary, wheat roots change root pH by releasing or absorbing H + , thereby regulating the NO 3 − transport of wheat roots, thereby affecting nutrient availability.…”

Section: Discussionmentioning

confidence: 99%

Responses of root characteristics and nitrogen absorption and assimilation to different pH gradients of winter wheat at seedling stage

Shi,

Wang,

Wang

et al. 2023

PLoS ONE

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Nitrogen (N) and rhizosphere pH are the two main factors restricting the growth of winter wheat (Triticum aestivum L.) in North China Plain. Soil nutrient availability is affected by soil acidity and alkalinity. In order to understand the effect of rhizosphere pH value on wheat nitrogen metabolism and the response of wheat growth to pH value at seedling stage, winter wheat varieties ‘Aikang 58’ (AK58) and ‘Bainong 4199’ (BN4199) were tested in hydroponics under three pH treatments (pH = 4.0, 6.5, and 9.0). The results showed that the accumulation of dry matter in root and above ground under pH 4.0 and pH 9.0 treatments was lower than that under pH 6.5 treatments, and the root/shoot ratio increased with the increase of pH value. Regardless of pH value, ‘BN4199’ had higher root dry weight, root length, root surface area, root activity and root tip than ‘AK58’. Therefore, wheat that is tolerant to extreme pH is able to adapt to the acid-base environment by changing root characteristics. At pH 4.0, the net H+ outflow rate of wheat roots was significantly lower than that of the control group, and the net NO3− flux of wheat roots was also low. The net H+ outflow occurred at pH 6.5 and 9.0, and at the same time, the net NO3− flux of roots also increased, and both increased with the increase of pH. The activity of nitrate reductase (NR) in stem of pH 9.0 treatment was significantly higher than that of other treatments, while the activity of glutamine synthetase (GS) in root and stem of pH 6.5 treatment was significantly higher than that of other treatments. Under pH 4.0 and pH 9.0 treatments, the activities of NR and GS in ‘BN4199’ were higher than those in ‘AK58’, The root respiration of ‘BN4199’ was significantly higher than that of ‘AK58’ under pH 4.0 and pH 9.0 treatment, and ‘BN4199’ had higher NO3− net flux, key enzyme activity of root nitrogen metabolism and root respiration. Therefore, we believe that ‘BN4199’ has strong resistance ability to extreme pH stress, and high root/shoot ratio and strong root respiration can be used as important indicators for wheat variety screening adapted to the alkaline environment at the seedling stage.

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Regulatory role of organic acids and phytochelators in influencing the rhizospheric availability of phosphorus and iron and their uptake by plants

Cited by 7 publications

References 98 publications

Enhancing soil health and fruit yield through Tephrosia biomass mulching in rainfed guava (Psidium guajava L.) orchards

Enhancing soil health and fruit yield through Tephrosia biomass mulching in rainfed guava (Psidium guajava L.) orchards

Sex‐specific phosphorus acquisition strategies and cycling in dioecious Populus euphratica forests along a natural water availability gradient

Responses of root characteristics and nitrogen absorption and assimilation to different pH gradients of winter wheat at seedling stage

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