Identification of vivianite formed on the roots of paddy rice grown in pots

Nanzyo, Masami; Yaginuma, H.; Sasaki, Kana; Ito, Kumiko; Aikawa, Yoshio; Kanno, H.; Takahashi, Tadashi

doi:10.1111/j.1747-0765.2010.00463.x

Cited by 24 publications

(16 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed morphological properties of vivianite crystals resembled those reported by Nanzyo et al (2010Nanzyo et al ( , 2013. Figure 6a shows the crystal aggregates formed on thin rice roots from the CF micro plot that were sampled on September 2 (104 DAT).…”

Section: Observation Of Vivianite Crystals On Rice Rootssupporting

confidence: 68%

“…More recently, Nanzyo et al (2010Nanzyo et al ( , 2013 confirmed the presence of vivianite crystals on aged rice roots under reducing conditions by X-ray microdiffraction, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. Vivianite was present as crystal aggregates both within and on the surface of aged rice roots after air-drying the samples.…”

Section: Introductionmentioning

confidence: 85%

See 1 more Smart Citation

Effect of water management on the vivianite content of paddy-rice roots

Kusunoki

Nanzyo

Kanno

et al. 2015

Soil Science and Plant Nutrition

Self Cite

View full text Add to dashboard Cite

Vivianite is a hydrated ferrous phosphate mineral that can form in reducing environments, and it was recently identified on aged paddy rice (Oryza sativa, L., cultivar Hitomebore) roots. However, the formation and dissolution of vivianite appear highly susceptible to the soil redox potential. We examined the effect of water management on the vivianite content of rice roots in three experimental micro (1 m 2 ) paddy fields. The vivianite content of the roots was estimated using a method based on the alteration of vivianite after heating at 105°C for 48 h. This alteration steeply lowers the dissolution of phosphate from the roots in a mixed acid solution of 0.1 mol L −1 of hydrochloric acid (HCl) and 1 mol L −1 of acetic acid (CH 3 COOH). Efficiency of the method was confirmed regarding heating temperature and duration of heating. Using this method, we found that water management significantly influenced the vivianite content of the rice roots. The vivianite content of the rice roots was highest, i.e., 2.3 g phosphorus (P) kg −1 expressed by its estimated P content, when the paddy field was continuously flooded from May to until early September. After flooding stopped, the soil was gradually oxidized, leading to a decrease in vivianite content. In the micro plot exposed to midseason drainage, the vivianite content increased to the level of the continuously flooded plot after reflooding, and finally decreased after flooding was stopped in late August. The plots exposed to midseason drainage followed by intermittent irrigation presented the lowest vivianite contents among the three experimental paddy fields. These results confirm that increases and decreases in the vivianite contents of paddy-rice roots strongly depend on water management.

show abstract

Section: Observation Of Vivianite Crystals On Rice Rootssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 85%

Effect of water management on the vivianite content of paddy-rice roots

Kusunoki

Nanzyo

Kanno

et al. 2015

Soil Science and Plant Nutrition

Self Cite

View full text Add to dashboard Cite

show abstract

“…Wang et al (2013) reported that amount of ROL per plant and Fe plaque increased dramatically from tillering to ear emergence stages and then decreased at the grain-filling stage. Nanzyo et al (2010) found that the quantity of root Fe plaque reached its peak at the tillering stage, after which it gradually decreased. Furthermore, dissolved organic matter (DOM) secreted by roots might influence the formation of Fe plaque since DOM could provide protons and electrons for reductive dissolution of Fe plaque (Zhang et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…It is notable that the ROL and Fe plaque of rice roots could change in amount and composition during growth (Nanzyo et al 2010;Wang et al 2013). Wang et al (2013) reported that amount of ROL per plant and Fe plaque increased dramatically from tillering to ear emergence stages and then decreased at the grain-filling stage.…”

Section: Introductionmentioning

confidence: 99%

Radial oxygen loss has different effects on the accumulation of total mercury and methylmercury in rice

Wang

Li²,

Tam

et al. 2014

Plant Soil

View full text Add to dashboard Cite

Background and Aims Mercury (Hg) pollution in paddy fields and rice has aroused great concern in recent years. This study investigated the dynamic changes of radial oxygen loss (ROL) and Fe plaque formation on roots, and their effects on Hg accumulation in rice plants. Methods A rhizobag experiment was conducted to study temporal variations and correlations between ROL (amounts and rates), Fe plaque formation, total Hg (THg) and methylmercury (MeHg) in plant tissues and in plaque of four rice cultivars during six growth stages.Results ROL amounts and Fe plaque formation increased from tillering to reproductive stages, then ROL amounts gradually decreased until maturation stage, whereas Fe plaque remained relatively stable. ROL rates continued to decline during the entire growth period. Both ROL amounts and Fe concentrations in plaque were positively correlated with THg concentrations in the plaque, whereas negatively correlated with THg in straw and brown rice. However, there were no significant relationships between ROL, Fe in plaque and MeHg in plaque and in plant tissues.Plant Soil (2014) 385:343-355 DOI 10.1007/s11104-014-2239-x Responsible Editor

show abstract

“…Their finding was directly related to rice plants. Their observation was later confirmed using X-ray microdiffraction and SEM-EDX analyses on rice roots grown in pots (Nanzyo et al 2010) and in ordinary paddy fields (Nanzyo et al 2013). Figure 5.11a shows vivianite crystal aggregates formed on rice roots.…”

Section: Detection Of Vivianite In Paddy Field Soilmentioning

confidence: 72%

Inorganic Soil Constituents Sensitive to Varying Redox Conditions

Nanzyo

Kanno

2018

Inorganic Constituents in Soil

Self Cite

View full text Add to dashboard Cite

Inorganic soil constituents sensitive to varying redox conditions, such as hydrated iron oxide, vivianite, siderite, iron (II) sulfides, and jarosite, are analyzed using optical and electron microscopes, energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). Many of these minerals are sourced from paddy field soils, which undergo reducing and oxidizing conditions in the plow layer every year. Iron mottles formed at the soil redox interface in the presence of reducing and oxidizing conditions provide significant visual evidence of varying redox conditions in soil. Polished sections were used to examine the elemental distributions and morphological properties of the mottles. One type of iron mottles is formed around rice roots by oxygen diffusion from the roots. They are cylindrical in form and include soil matrix minerals. Other type of iron mottles is formed on the surfaces of irregular or vesicular pores by oxygen diffusion through soil pores after drainage. These mottles contain few soil matrix minerals. In association with iron, the distribution of phosphate is strongly affected by changes in redox conditions in paddy field soils with low active Al content.

show abstract

Identification of vivianite formed on the roots of paddy rice grown in pots

Cited by 24 publications

References 12 publications

Effect of water management on the vivianite content of paddy-rice roots

Effect of water management on the vivianite content of paddy-rice roots

Radial oxygen loss has different effects on the accumulation of total mercury and methylmercury in rice

Inorganic Soil Constituents Sensitive to Varying Redox Conditions

Contact Info

Product

Resources

About