Genetic regulation of homeostasis, uptake, bio-fortification and efficiency enhancement of iron in rice

Pradhan, Sharat Kumar; Pandit, Elssa; Pawar, Swapnil; Behera, Lambodar; Das, Subrata; Pathak, H.

doi:10.1016/j.envexpbot.2020.104066

Cited by 22 publications

(11 citation statements)

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“…The element is a co-factor in many enzymes useful in photosynthesis, structural constituent in chlorophyll, proteins, mitochondrial respiration, metal homeostasis and nucleic acid synthesis [ 1 – 6 ]. However, uptake in higher concentration of Fe is toxic to rice plant [ 7 – 17 ]. Toxicity stress is usually seen in lowland rice.…”

Section: Introductionmentioning

confidence: 99%

“…Reduction in grain yield due to this stress is high in Burundi, Sierra leone, Burkina Faso, Liberia, Togo, Nigeria, Senegal, Srilanka, Philippines, Malaysia, Indonesia, Vietnam, Thailand, Malaysia, Colombia, Benin, Ivory Coast, Niger, Gambia, Guinea, Guinea-Bissau and Liberia [ 21 – 24 ]. This is also a problem in few locations in Kerala, Coastal and hilly zones of Karnataka, Tamil Nadu, valley soils in Odisha and north eastern region of Meghalaya in India [ 17 , 23 , 24 ]. Existence of genetic variation for Fe-toxicity tolerance in rice is reported in many publications [ 17 , 25 – 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…This is also a problem in few locations in Kerala, Coastal and hilly zones of Karnataka, Tamil Nadu, valley soils in Odisha and north eastern region of Meghalaya in India [ 17 , 23 , 24 ]. Existence of genetic variation for Fe-toxicity tolerance in rice is reported in many publications [ 17 , 25 – 30 ]. Gene(s)/QTL controlling this stress tolerance and development of robust markers for transfer of tolerance gene into high yielding rice varieties are required for Fe-toxicity tolerance improvement in rice.…”

Section: Introductionmentioning

confidence: 99%

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Population genetic structure and association mapping for iron toxicity tolerance in rice

et al. 2021

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Iron (Fe) toxicity is a major abiotic stress which severely reduces rice yield in many countries of the world. Genetic variation for this stress tolerance exists in rice germplasms. Mapping of gene(s)/QTL controlling the stress tolerance and transfer of the traits into high yielding rice varieties are essential for improvement against the stress. A panel population of 119 genotypes from 352 germplasm lines was constituted for detecting the candidate gene(s)/QTL through association mapping. STRUCTURE, GenAlEx and Darwin softwares were used to classify the population. The marker-trait association was detected by considering both the Generalized Linear Model (GLM) and Mixed Linear Model (MLM) analyses. Wide genetic variation was observed among the genotypes present in the panel population for the stress tolerance. Linkage disequilibrium was detected in the population for iron toxicity tolerance. The population was categorized into three genetic structure groups. Marker-trait association study considering both the Generalized Linear Model (GLM) and Mixed Linear Model (MLM) showed significant association of leaf browning index (LBI) with markers RM471, RM3, RM590 and RM243. Three novel QTL controlling Fe-toxicity tolerance were detected and designated as qFeTox4.3, qFeTox6.1 and qFeTox10.1. A QTL reported earlier in the marker interval of C955-C885 on chromosome 1 is validated using this panel population. The present study showed that QTL controlling Fe-toxicity tolerance to be co-localized with the QTL for Fe-biofortification of rice grain indicating involvement of common pathway for Fe toxicity tolerance and Fe content in rice grain. Fe-toxicity tolerance QTL qFeTox6.1 was co-localized with grain Fe-biofortification QTLs qFe6.1 and qFe6.2 on chromosome 6, whereas qFeTox10.1 was co-localized with qFe10.1 on chromosome 10. The Fe-toxicity tolerance QTL detected from this mapping study will be useful in marker-assisted breeding programs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Population genetic structure and association mapping for iron toxicity tolerance in rice

et al. 2021

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“…Fe-rich plaque was formed around the rice root by rhizosphere oxygenation following radial oxygen loss through root aerenchyma to the root surface and oxidation of Fe(II) at the root surface (i.e., biologically-induced biomineralization) 4 . Further, rice roots can take up Fe 3+ by phytosiderophore, and Fe 2+ followed by Fe chelation and reduction 5 . To store Fe in a safe and bioavailabile form, the iron oxide nanoparticles (such as ferrihydrite (5Fe 2 O 3 ·9H 2 O) in ferritin) are formed in the cytocol and organelles of the root (i.e., matrix-mediated biomineralization) 6 .…”

Section: Introductionmentioning

confidence: 99%

Advanced characterization of biomineralization at plaque layer and inside rice roots amended with iron- and silica-enhanced biochar

Chen

Taherymoosavi

Cheong

et al. 2021

Sci Rep

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Application of iron (Fe)- and silica (Si)-enhanced biochar compound fertilisers (BCF) stimulates rice yield by increasing plant uptake of mineral nutrients. With alterations of the nutrient status in roots, element homeostasis (e.g., Fe) in the biochar-treated rice root was related to the formation of biominerals on the plaque layer and in the cortex of roots. However, the in situ characteristics of formed biominerals at the micron and sub-micron scale remain unknown. In this study, rice seedlings (Oryza sativa L.) were grown in paddy soil treated with BCF and conventional fertilizer, respectively, for 30 days. The biochar-induced changes in nutrient accumulation in roots, and the elemental composition, distribution and speciation of the biomineral composites formed in the biochar-treated roots at the micron and sub-micron scale, were investigated by a range of techniques. Results of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) showed that biochar treatment significantly increased concentrations of nutrients (e.g., Fe, Si, and P) inside the root. Raman mapping and vibrating sample magnetometry identified biochar particles and magnetic Fe nanoparticles associated with the roots. With Fe plaque formation, higher concentrations of FeOx− and FeOxH− anions on the root surface than the interior were detected by time-of-flight secondary ionization mass spectrometry (ToF-SIMS). Analysis of data from scanning electron microscopy energy-dispersive spectroscopy (SEM-EDS), and from scanning transmission electron microscopy (STEM) coupled with EDS or energy electron loss spectroscopy (EELS), determined that Fe(III) oxide nanoparticles were accumulated in the crystalline fraction of the plaque and were co-localized with Si and P on the root surface. Iron-rich nanoparticles (Fe–Si nanocomposites with mixed oxidation states of Fe and ferritin) in the root cortex were identified by using aberration-corrected STEM and in situ EELS analysis, confirming the biomineralization and storage of Fe in the rice root. The findings from this study highlight that the deposition of Fe-rich nanocomposites occurs with contrasting chemical speciation in the Fe plaque and cortex of the rice root. This provides an improved understanding of the element homeostasis in rice with biochar-mineral fertilization.

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“…Among the various Zn 2+ complexes, those with NA and DMA play important roles in maintaining concentrations of Zn 2+ in the cytoplasm within the desirable range (Clemens et al, 2013; Takahashi et al, 2003). Speciation‐mediated cellular trafficking of Zn and Fe has been extensively studied in rice ( Oryza sativa L) (Kar & Panda, 2020; Kawakami & Bhullar, 2018; Pradhan et al, 2020); however, it has not been closely studied in wheat. When attempting to increase the concentration of Zn in the wheat grain; consequently, to achieve Zn biofortification targets in wheat, further studies are required to elucidate the speciation‐mediated cellular trafficking of Zn.…”

Section: Speciation‐regulated Zn Cellular Trafficking For Genetic Bio...mentioning

confidence: 99%

Genetic biofortification of wheat with zinc: Opportunities to fine‐tune zinc uptake, transport and grain loading

Kamaral

Neate

Gunasinghe

et al. 2021

Physiologia Plantarum

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Zinc (Zn) is an important micronutrient in the human body, and health complications associated with insufficient dietary intake of Zn can be overcome by increasing the bioavailable concentrations in edible parts of crops (biofortification). Wheat (Triticum aestivum L) is the most consumed cereal crop in the world; therefore, it is an excellent target for Zn biofortification programs. Knowledge of the physiological and molecular processes that regulate Zn concentration in the wheat grain is restricted, inhibiting the success of genetic Zn biofortification programs. This review helps break this nexus by advancing understanding of those processes, including speciation regulated uptake, root to shoot transport, remobilisation, grain loading and distribution of Zn in wheat grain. Furthermore, new insights to genetic Zn biofortification of wheat are discussed, and where data are limited, we draw upon information for other cereals and Fe distribution. We identify the loading and distribution of Zn in grain as major bottlenecks for biofortification, recognising anatomical barriers in the vascular region at the base of the grain, and physiological and molecular restrictions localised in the crease region as major limitations. Movement of Zn from the endosperm cavity into the modified aleurone, aleurone and then to the endosperm is mainly regulated by ZIP and YSL transporters. Zn complexation with phytic acid in the aleurone limits Zn mobility into the endosperm. These insights, together with synchrotron‐X‐ray‐fluorescence microscopy, support the hypothesis that a focus on the mechanisms of Zn loading into the grain will provide new opportunities for Zn biofortification of wheat.

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Genetic regulation of homeostasis, uptake, bio-fortification and efficiency enhancement of iron in rice

Cited by 22 publications

References 208 publications

Population genetic structure and association mapping for iron toxicity tolerance in rice

Population genetic structure and association mapping for iron toxicity tolerance in rice

Advanced characterization of biomineralization at plaque layer and inside rice roots amended with iron- and silica-enhanced biochar

Genetic biofortification of wheat with zinc: Opportunities to fine‐tune zinc uptake, transport and grain loading

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